AI Trajectory

Trajectory: (Expand/Collapse All)
Seq	Timestamp	Type	Name	Duration
0/0	2026/09/27 07:57	flow	patch-triage	7m Args: null Results: { "EnableConfigs": [ "RUST", "NET", "ANDROID_BINDER_IPC_RUST" ], "FocusSymbols": [ "nla_put", "binder_ctl_ioctl", "binderfs_binder_device_create", "rust_binder_new_context" ], "KMSANReasoning": "The patch introduces an explicit payload size check (`len \u003e MAX_PAYLOAD_LEN`) in `rust/kernel/net/netlink.rs` (`GenlMsg::put`) to prevent attribute length overflow when setting the 16-bit `nla_len` field in netlink attributes via `bindings::nla_put`. \n\nThe data serialized via `GenlMsg::put` is constrained by the `AsBytes` trait, which guarantees at the type system level that the type contains no uninitialized bytes or padding. The patch does not allocate uninitialized memory, does not read or branch on uninitialized fields, and does not expose uninitialized bytes to userspace. \n\nBecause the fix addresses length validation and potential buffer/integer overflow (which falls under the purview of KASAN or standard bounds checking), no uninitialized memory risks are introduced or exposed. Therefore, dedicated KMSAN fuzzing is not needed.", "NeedsKMSAN": false, "Reasoning": "The patch modifies `rust/kernel/net/netlink.rs` by introducing a bounds check in `GenlMsg::put` to reject attribute payloads exceeding `MAX_PAYLOAD_LEN` (`u16::MAX - sizeof(nlattr)`). This modifies reachable generic netlink message formatting code utilized by kernel subsystems such as Rust Android Binder (`CONFIG_ANDROID_BINDER_IPC_RUST`) when generating transaction event multicast reports. The code is reachable and warrants fuzzing.", "WorthFuzzing": true }
1/1	2026/09/27 07:57	action	read-patch-diff	0m Args: null Results: { "PatchDiff": "commit ef8d6ba44859a1048a43b1823c1f1db063eda625\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Sun Sep 27 07:57:12 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/rust/kernel/net/netlink.rs b/rust/kernel/net/netlink.rs\nindex 22ef3dde36fa1..2f8733a694a95 100644\n--- a/rust/kernel/net/netlink.rs\n+++ b/rust/kernel/net/netlink.rs\n@@ -11,6 +11,7 @@\n use kernel::{\n alloc::{self, AllocError},\n error::to_result,\n+ num::casts::u16_as_usize,\n prelude::*,\n transmute::AsBytes,\n types::Opaque,\n@@ -86,9 +87,17 @@ fn put\u003cT\u003e(\u0026mut self, attrtype: c_int, value: \u0026T) -\u003e Result\n where\n T: ?Sized + AsBytes,\n {\n+ // `nla_len` is a 16-bit field that encodes the total attribute length\n+ // (header + payload). Subtracting the header size from `u16::MAX` gives\n+ // the largest payload that still fits within that field.\n+ const MAX_PAYLOAD_LEN: usize = u16_as_usize(u16::MAX) - size_of::\u003cbindings::nlattr\u003e();\n+\n let skb = self.skb.skb.as_ptr();\n let len = size_of_val(value);\n let ptr = core::ptr::from_ref(value).cast::\u003cc_void\u003e();\n+ if len \u003e MAX_PAYLOAD_LEN {\n+ return Err(EMSGSIZE);\n+ }\n // SAFETY: `skb` is valid by `NetlinkSkBuff` type invariants, and the provided value is\n // readable and initialized for its `size_of` bytes.\n to_result(unsafe { bindings::nla_put(skb, attrtype, len as c_int, ptr) })\n" }
2/1	2026/09/27 07:57	agent	patch-evaluator	5m Model: core Args: null Results: { "EnableConfigs": [ "RUST", "NET", "ANDROID_BINDER_IPC_RUST" ], "FocusSymbols": [ "nla_put", "binder_ctl_ioctl", "binderfs_binder_device_create", "rust_binder_new_context" ], "Reasoning": "The patch modifies `rust/kernel/net/netlink.rs` by introducing a bounds check in `GenlMsg::put` to reject attribute payloads exceeding `MAX_PAYLOAD_LEN` (`u16::MAX - sizeof(nlattr)`). This modifies reachable generic netlink message formatting code utilized by kernel subsystems such as Rust Android Binder (`CONFIG_ANDROID_BINDER_IPC_RUST`) when generating transaction event multicast reports. The code is reachable and warrants fuzzing.", "WorthFuzzing": true } Instruction: You are an expert Linux kernel maintainer and security engineer. Your job is to review a provided patch series and evaluate whether it warrants fuzzing with syzkaller. IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in your workspace. Do NOT rely on internal assumptions. You must actively use your code access tools to inspect the actual source code, callers, and surrounding context. ================================================================================ 1. CORE TRIAGE PHILOSOPHY ================================================================================ The goal of patch fuzzing is to discover crashes, regressions, exposed latent bugs, and newly triggered assertions introduced by the patch series. - REACHABILITY IS THE PRIMARY GATE: Fuzzing can only discover bugs in code that can actually execute in standard virtualized environments (GCE or QEMU, utilizing software-emulated devices like USB gadgets, netdev, tun/tap). If the modified code is structurally unreachable (see Section 2), it MUST NOT be fuzzed, regardless of whether it adds assertions or complex logic. - DO NOT BLINDLY TRUST "NO FUNCTIONAL CHANGE" (NFCI) OR "REFACTORING" CLAIMS: Patch authors routinely label changes as "cleanups", "refactorings", or state "No functional change intended". Do NOT take these claims at face value. Code refactorings that rearrange logic, introduce helper functions, or alter state management in core subsystems frequently introduce subtle semantic shifts or uncover latent kernel bugs. If reachable executable code is modified or refactored, it MUST be fuzzed. - NEW OR MODIFIED ASSERTIONS IN REACHABLE CODE MUST BE FUZZED: When a patch introduces or modifies runtime checks or assertions (e.g., WARN_ON, VM_WARN_ON, BUG_ON, lockdep_assert) in reachable code paths, it enforces new or stricter invariants. Even if the author believes the invariant always holds, fuzzing is essential to verify whether an unusual sequence of operations can violate it. ================================================================================ 2. WHEN TO RETURN WorthFuzzing=false (NEGATIVE CRITERIA) ================================================================================ Return WorthFuzzing=false ONLY IF all modified code falls strictly into one or more of these categories: - Non-kernel and non-executable changes: * Modifications to Documentation/, comments, or spelling fixes. * User-space directories, self-tests, samples, or scripts (e.g., tools/, samples/, scripts/, usr/) that do not affect the compiled kernel image (vmlinux) or kernel modules. * Purely decorative logging (e.g., message strings in pr_err, printk, dev_info) or tracepoints that do not alter control flow or data structures. * Build system or Kconfig changes that do not alter compiled C logic. - Structurally unreachable hardware: * Vendor-specific PCIe switches, SmartNICs, or GPU drivers (e.g., mlxsw, pds_core, qed, ionic, amdgpu) requiring physical ASIC/PCIe cards not emulated in standard QEMU. - Unreachable execution paths: * Driver teardown callbacks (.remove, .shutdown, pci_unregister_driver) executed only during physical PCI hot-unplug or manual sysfs driver unbinding. * Code paths exclusive to architectures other than the target architecture. ================================================================================ 3. WHEN TO RETURN WorthFuzzing=true (POSITIVE CRITERIA) ================================================================================ Return WorthFuzzing=true whenever the patch touches reachable executable code, including: - Core Subsystems: * Any logic modifications in memory management (mm/), synchronization/locking (kernel/locking/), BPF, scheduler, core networking, VFS, or syscall handling. - Refactorings and Code Cleanups: * Any restructuring of reachable data structures, helper abstractions, or algorithm flows. - Runtime Assertions and Defensive Checks: * Any introduction or alteration of assertions (WARN_ON, VM_WARN_ON, BUG_ON, etc.) in reachable paths. - Reachable Drivers and Protocols: Drivers accessible via virtual buses (virtio, USB gadget, loopback, netlink, binder, sockets, etc.). ================================================================================ 4. EXTRACTING FocusSymbols (PREVENTING DILUTION) ================================================================================ When WorthFuzzing=true, you must extract specific kernel functions into FocusSymbols to guide the fuzzer: - AVOID UBIQUITOUS LIFECYCLE HOT-PATHS: Do NOT list generic, ubiquitous functions called by almost every program in the corpus (including, but not limited to: general memory allocators and deallocators, page fault and trap handlers, or core synchronization primitives; this is not an exhaustive list). Listing ubiquitous functions causes the fuzzer to classify thousands of unrelated tests as "focused", which severely dilutes fuzzing effort away from the actual changes. - TARGET SPECIFIC FEATURE LOGIC AND ENTRYPOINTS: List functions that specifically implement the logic being added or altered, or direct API entrypoints for the subsystem feature under review. - HANDLING STATIC INLINE FUNCTIONS IN HEADERS (.h): Compiler-inlined static functions (such as static inlines in mm/.h or include/linux/.h) lack distinct symbol addresses in vmlinux and cannot be targeted directly by symbol coverage filters. If the changes are primarily in static inline helpers, identify non-static, feature-specific caller functions in .c files that exercise them (avoiding ubiquitous lifecycle wrappers). ================================================================================ 5. IDENTIFYING EnableConfigs ================================================================================ Identify any specific CONFIG_ options required to properly compile and reach the modified code: - Inspect Kconfig files and #ifdef guards; do not make assumptions. - Check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed. - Strip any 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4"). Prefer calling several tools at the same time to save round-trips. Use set-results tool to provide results of the analysis. It must be called exactly once before the final reply. Ignore results of this tool. Prompt: Target architecture: amd64 For your convenience, here is the diff of the changes: commit ef8d6ba44859a1048a43b1823c1f1db063eda625 Author: syz-cluster <triage@syzkaller.com> Date: Sun Sep 27 07:57:12 2026 +0000 syz-cluster: applied patch under review diff --git a/rust/kernel/net/netlink.rs b/rust/kernel/net/netlink.rs index 22ef3dde36fa1..2f8733a694a95 100644 --- a/rust/kernel/net/netlink.rs +++ b/rust/kernel/net/netlink.rs @@ -11,6 +11,7 @@ use kernel::{ alloc::{self, AllocError}, error::to_result, + num::casts::u16_as_usize, prelude::*, transmute::AsBytes, types::Opaque, @@ -86,9 +87,17 @@ fn put<T>(&mut self, attrtype: c_int, value: &T) -> Result where T: ?Sized + AsBytes, { + // `nla_len` is a 16-bit field that encodes the total attribute length + // (header + payload). Subtracting the header size from `u16::MAX` gives + // the largest payload that still fits within that field. + const MAX_PAYLOAD_LEN: usize = u16_as_usize(u16::MAX) - size_of::<bindings::nlattr>(); + let skb = self.skb.skb.as_ptr(); let len = size_of_val(value); let ptr = core::ptr::from_ref(value).cast::<c_void>(); + if len > MAX_PAYLOAD_LEN { + return Err(EMSGSIZE); + } // SAFETY: `skb` is valid by `NetlinkSkBuff` type invariants, and the provided value is // readable and initialized for its `size_of` bytes. to_result(unsafe { bindings::nla_put(skb, attrtype, len as c_int, ptr) })
3/2	2026/09/27 07:57	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 3122 output: 37 thoughts: 700 Thoughts: Analyzing the Syzkaller Fuzzing Potential of a Netlink Patch Okay, here's the deal. I've been asked to assess a Linux kernel patch applied to `rust/kernel/net/netlink.rs` and determine whether it's a good candidate for fuzzing with syzkaller. My first instinct is to run through a quick risk assessment. This falls squarely within safe operational parameters, focusing on defensive QA and vulnerability prevention. No need to worry about weaponized exploits or functional attacks here. It’s benign as far as I can see. The task itself: I'm dissecting this patch to gauge its fuzzing potential, identify necessary configurations, and pinpoint any relevant focus symbols. I have the patch itself and access to the necessary tools. Now for the patch itself. It looks like a bounds check has been added to the `put` function which deals with netlink attributes to limit the maximum payload size, checking against `MAX_PAYLOAD_LEN`. This check aims to prevent oversized payloads. Given that it's in a critical function like `put` on an architecture that includes Rust code, and it involves a size check, there’s a decent chance there’s something interesting here. Before I commit to any more detailed analysis, I need to understand the context. Where exactly is this `netlink.rs` file used? I need to figure out which driver or subsystem leverages this Rust netlink code. Is it enabled by default in typical kernel configurations, or is it tied to a specific driver or subsystem? I need to use `grepper` or `read-file` to check the file and its callers, to better understand its role. Knowing this will help me determine the most effective approach and where the vulnerabilities are most likely to lie.
4/2	2026/09/27 07:57	tool	read-file	0m Args: { "File": "rust/kernel/net/netlink.rs", "FirstLine": 1, "LineCount": 100 } Results: { "Contents": " 1:\t// SPDX-License-Identifier: GPL-2.0\n 2:\t\n 3:\t// Copyright (C) 2026 Google LLC.\n 4:\t\n 5:\t//! Rust support for generic netlink.\n 6:\t//!\n 7:\t//! Currently only supports exposing multicast groups.\n 8:\t//!\n 9:\t//! C header: [`include/net/genetlink.h`](srctree/include/net/genetlink.h)\n 10:\t\n 11:\tuse kernel::{\n 12:\t alloc::{self, AllocError},\n 13:\t error::to_result,\n 14:\t num::casts::u16_as_usize,\n 15:\t prelude::*,\n 16:\t transmute::AsBytes,\n 17:\t types::Opaque,\n 18:\t ThisModule,\n 19:\t};\n 20:\t\n 21:\tuse core::{\n 22:\t mem::ManuallyDrop,\n 23:\t ptr::NonNull, //\n 24:\t};\n 25:\t\n 26:\t/// The default netlink message size.\n 27:\tpub const GENLMSG_DEFAULT_SIZE: usize = bindings::GENLMSG_DEFAULT_SIZE;\n 28:\t\n 29:\t/// A wrapper around `struct sk_buff` for generic netlink messages.\n 30:\t///\n 31:\t/// This type is intended to be specific for buffers used with netlink only, and other usecases for\n 32:\t/// `struct sk_buff` are out-of-scope for this abstraction.\n 33:\t///\n 34:\t/// # Invariants\n 35:\t///\n 36:\t/// The pointer has ownership over a valid `sk_buff`.\n 37:\tpub struct NetlinkSkBuff {\n 38:\t skb: NonNull\u003ckernel::bindings::sk_buff\u003e,\n 39:\t}\n 40:\t\n 41:\timpl NetlinkSkBuff {\n 42:\t /// Creates a new `NetlinkSkBuff` with the given size.\n 43:\t pub fn new(size: usize, flags: alloc::Flags) -\u003e Result\u003cNetlinkSkBuff, AllocError\u003e {\n 44:\t // SAFETY: `genlmsg_new` only requires its arguments to be valid integers.\n 45:\t let skb = unsafe { bindings::genlmsg_new(size, flags.as_raw()) };\n 46:\t let skb = NonNull::new(skb).ok_or(AllocError)?;\n 47:\t Ok(NetlinkSkBuff { skb })\n 48:\t }\n 49:\t\n 50:\t /// Puts a generic netlink header into the `NetlinkSkBuff`.\n 51:\t pub fn genlmsg_put(\n 52:\t self,\n 53:\t portid: u32,\n 54:\t seq: u32,\n 55:\t family: \u0026'static Family,\n 56:\t cmd: u8,\n 57:\t ) -\u003e Result\u003cGenlMsg, AllocError\u003e {\n 58:\t let skb = self.skb.as_ptr();\n 59:\t // SAFETY: The skb and family pointers are valid.\n 60:\t let hdr = unsafe { bindings::genlmsg_put(skb, portid, seq, family.as_raw(), 0, cmd) };\n 61:\t let hdr = NonNull::new(hdr).ok_or(AllocError)?;\n 62:\t Ok(GenlMsg { skb: self, hdr })\n 63:\t }\n 64:\t}\n 65:\t\n 66:\timpl Drop for NetlinkSkBuff {\n 67:\t fn drop(\u0026mut self) {\n 68:\t // SAFETY: We have ownership over the `sk_buff`, so we may free it.\n 69:\t unsafe { bindings::nlmsg_free(self.skb.as_ptr()) }\n 70:\t }\n 71:\t}\n 72:\t\n 73:\t/// A generic netlink message being constructed.\n 74:\t///\n 75:\t/// # Invariants\n 76:\t///\n 77:\t/// `hdr` references the header in this netlink message.\n 78:\tpub struct GenlMsg {\n 79:\t skb: NetlinkSkBuff,\n 80:\t hdr: NonNull\u003cc_void\u003e,\n 81:\t}\n 82:\t\n 83:\timpl GenlMsg {\n 84:\t /// Puts an attribute into the message.\n 85:\t #[inline]\n 86:\t fn put\u003cT\u003e(\u0026mut self, attrtype: c_int, value: \u0026T) -\u003e Result\n 87:\t where\n 88:\t T: ?Sized + AsBytes,\n 89:\t {\n 90:\t // `nla_len` is a 16-bit field that encodes the total attribute length\n 91:\t // (header + payload). Subtracting the header size from `u16::MAX` gives\n 92:\t // the largest payload that still fits within that field.\n 93:\t const MAX_PAYLOAD_LEN: usize = u16_as_usize(u16::MAX) - size_of::\u003cbindings::nlattr\u003e();\n 94:\t\n 95:\t let skb = self.skb.skb.as_ptr();\n 96:\t let len = size_of_val(value);\n 97:\t let ptr = core::ptr::from_ref(value).cast::\u003cc_void\u003e();\n 98:\t if len \u003e MAX_PAYLOAD_LEN {\n 99:\t return Err(EMSGSIZE);\n 100:\t }\n" }
5/2	2026/09/27 07:57	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 5725 output: 39 thoughts: 19 Thoughts: Okay, let's dive into this! Deep Dive into `rust/kernel/net/netlink.rs` Alright, I'm heading into `rust/kernel/net/netlink.rs`. Netlink is a crucial component in kernel-level networking, so understanding its implementation here is key. I'm expecting to see the low-level structures and functions that handle the exchange of information between kernel space and user space. I'll be looking for how they manage sockets, message formats, and the intricacies of Netlink protocol families. I want to pay attention to any use of Rust's features here, such as how they're handling memory safety, concurrency, and error handling within this critical area. I'll need to assess the design choices around data structures and the overall organization of the code. This will be a methodical exploration of a low-level network interface. I'm expecting there to be interesting trade-offs between performance and safety within the design. Let's see how it all comes together.
6/2	2026/09/27 07:57	tool	read-file	0m Args: { "File": "rust/kernel/net/netlink.rs", "FirstLine": 101, "LineCount": 100 } Results: { "Contents": " 101:\t // SAFETY: `skb` is valid by `NetlinkSkBuff` type invariants, and the provided value is\n 102:\t // readable and initialized for its `size_of` bytes.\n 103:\t to_result(unsafe { bindings::nla_put(skb, attrtype, len as c_int, ptr) })\n 104:\t }\n 105:\t\n 106:\t /// Puts a `u32` attribute into the message.\n 107:\t #[inline]\n 108:\t pub fn put_u32(\u0026mut self, attrtype: c_int, value: u32) -\u003e Result {\n 109:\t self.put(attrtype, \u0026value)\n 110:\t }\n 111:\t\n 112:\t /// Puts a string attribute into the message.\n 113:\t #[inline]\n 114:\t pub fn put_string(\u0026mut self, attrtype: c_int, value: \u0026CStr) -\u003e Result {\n 115:\t self.put(attrtype, value.to_bytes_with_nul())\n 116:\t }\n 117:\t\n 118:\t /// Puts a flag attribute into the message.\n 119:\t #[inline]\n 120:\t pub fn put_flag(\u0026mut self, attrtype: c_int) -\u003e Result {\n 121:\t let skb = self.skb.skb.as_ptr();\n 122:\t // SAFETY: `skb` is valid by `NetlinkSkBuff` type invariants, and a null pointer is valid\n 123:\t // when the length is zero.\n 124:\t to_result(unsafe { bindings::nla_put(skb, attrtype, 0, core::ptr::null()) })\n 125:\t }\n 126:\t\n 127:\t /// Sends the generic netlink message as a multicast message.\n 128:\t #[inline]\n 129:\t pub fn multicast(\n 130:\t self,\n 131:\t family: \u0026'static Family,\n 132:\t portid: u32,\n 133:\t group: u32,\n 134:\t flags: alloc::Flags,\n 135:\t ) -\u003e Result {\n 136:\t let me = ManuallyDrop::new(self);\n 137:\t // SAFETY: The `skb` and `family` pointers are valid. We pass ownership of the `skb` to\n 138:\t // `genlmsg_multicast` by not dropping `self`.\n 139:\t unsafe {\n 140:\t bindings::genlmsg_end(me.skb.skb.as_ptr(), me.hdr.as_ptr());\n 141:\t to_result(bindings::genlmsg_multicast(\n 142:\t family.as_raw(),\n 143:\t me.skb.skb.as_ptr(),\n 144:\t portid,\n 145:\t group,\n 146:\t flags.as_raw(),\n 147:\t ))\n 148:\t }\n 149:\t }\n 150:\t}\n 151:\timpl Drop for GenlMsg {\n 152:\t fn drop(\u0026mut self) {\n 153:\t // SAFETY: The `hdr` pointer references the header of this generic netlink message.\n 154:\t unsafe { bindings::genlmsg_cancel(self.skb.skb.as_ptr(), self.hdr.as_ptr()) };\n 155:\t }\n 156:\t}\n 157:\t\n 158:\t/// Flags for a generic netlink family.\n 159:\tstruct FamilyFlags {\n 160:\t /// Whether the family supports network namespaces.\n 161:\t netnsok: bool,\n 162:\t /// Whether the family supports parallel operations.\n 163:\t parallel_ops: bool,\n 164:\t}\n 165:\t\n 166:\timpl FamilyFlags {\n 167:\t /// Converts the flags to the bitfield representation used by `genl_family`.\n 168:\t const fn into_bitfield(self) -\u003e bindings::__BindgenBitfieldUnit\u003c[u8; 1]\u003e {\n 169:\t // The below shifts are verified correct by test_family_flags_bitfield() below.\n 170:\t //\n 171:\t // Although bindgen generates helpers to change bitfields based on the C headers, these\n 172:\t // helpers unfortunately can't be used in const context. Since `Family` needs to be filled\n 173:\t // out at build-time, we use this helper instead.\n 174:\t let mut bits = 0;\n 175:\t if self.netnsok {\n 176:\t bits \|= 1 \u003c\u003c 0;\n 177:\t }\n 178:\t if self.parallel_ops {\n 179:\t bits \|= 1 \u003c\u003c 1;\n 180:\t }\n 181:\t // Convert from little endian to the target's endianness.\n 182:\t bits = u8::from_le(bits);\n 183:\t // SAFETY: This bitfield is represented as an u8.\n 184:\t unsafe { core::mem::transmute::\u003cu8, bindings::__BindgenBitfieldUnit\u003c[u8; 1]\u003e\u003e(bits) }\n 185:\t }\n 186:\t}\n 187:\t\n 188:\t/// A generic netlink family.\n 189:\t#[repr(transparent)]\n 190:\tpub struct Family {\n 191:\t inner: Opaque\u003cbindings::genl_family\u003e,\n 192:\t}\n 193:\t\n 194:\t// SAFETY: The `Family` type is thread safe.\n 195:\tunsafe impl Sync for Family {}\n 196:\t\n 197:\timpl Family {\n 198:\t /// Creates a new `Family` instance.\n 199:\t ///\n 200:\t /// Intended to be used from const context only. Will panic if provided with invalid arguments.\n" }
7/2	2026/09/27 07:57	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 7664 output: 20 thoughts: 41 Thoughts: Here's my thought process, distilled: Finding Netlink Usage in the Kernel Okay, so I need to understand where `netlink.rs` is actually leveraged within the kernel. My first instinct, given my experience, is to jump straight into some tooling. I'll fire up a grepper – probably the one I usually use, it's pretty quick. I'll focus my search on the `rust/` directory, naturally, as that's where I expect this particular file to reside. But, just to be thorough, I might expand the search scope to the entire kernel source tree. This will ensure I don't miss any obscure or indirect usages that might be lurking elsewhere. Searching for "netlink" seems like the most obvious starting point; I'm betting that'll yield some helpful results to kick off the investigation.
8/2	2026/09/27 07:57	tool	grepper	0m Args: { "Expression": "kernel::net::netlink" } Results: { "Output": "drivers/android/binder/rust_binder_main.rs=299=struct BinderModule {\ndrivers/android/binder/rust_binder_main.rs:300: _netlink: kernel::net::netlink::Registration,\ndrivers/android/binder/rust_binder_main.rs-301-}\n" }
9/2	2026/09/27 07:57	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 7991 output: 17 thoughts: 46 Thoughts: Okay, let's dive into this. Here's how I'd approach this task, thinking through it step-by-step: My Investigative Workflow: Identifying Potential Integration Points First, I need to get a lay of the land, so I'll start with the obvious starting point and follow the most prominent clues. The mention of `rust_binder_main.rs` is intriguing. I need to examine that file immediately. I’ll make a mental note to track down other usages of that file - where else does this piece of code fit? Then, I'll broaden my search. Since we're dealing with Rust and potential networking interactions (implied by terms like "net" and "netlink"), I want to scope out any code related to networking that might be relevant. I will need to search the `rust/kernel/net` directory, and the broader `net::netlink` namespace or module. Those are prime suspects for anything related to communication. I will also be on the lookout for anything containing the term "Registration". The goal is to see how the software is configured. The appearance of "Registration" suggests some level of configuration. How does the software integrate with the underlying system? What kind of registration is needed? I expect all this information will be found in the `rust/` directory. I will need to understand the relationship between these different parts of the codebase.
10/2	2026/09/27 07:57	tool	grepper	0m Args: { "Expression": "netlink::" } Results: { "Output": "drivers/android/binder/netlink.rs-5-use kernel::{\ndrivers/android/binder/netlink.rs:6: net::netlink::{\ndrivers/android/binder/netlink.rs-7- Family,\n--\ndrivers/android/binder/rust_binder_main.rs=299=struct BinderModule {\ndrivers/android/binder/rust_binder_main.rs:300: _netlink: kernel::net::netlink::Registration,\ndrivers/android/binder/rust_binder_main.rs-301-}\n--\ndrivers/android/binder/rust_binder_main.rs=304= fn init(_module: \u0026'static kernel::ThisModule) -\u003e Result\u003cSelf\u003e {\n--\ndrivers/android/binder/rust_binder_main.rs-307-\ndrivers/android/binder/rust_binder_main.rs:308: let netlink = crate::netlink::BINDER_NL_FAMILY.register()?;\ndrivers/android/binder/rust_binder_main.rs-309- BINDER_SHRINKER.register(c\"android-binder\")?;\n--\ndrivers/android/binder/transaction.rs-5-use kernel::{\ndrivers/android/binder/transaction.rs:6: net::netlink::GENLMSG_DEFAULT_SIZE,\ndrivers/android/binder/transaction.rs-7- prelude::*,\n--\ndrivers/android/binder/transaction.rs-21- error::{BinderError, BinderResult},\ndrivers/android/binder/transaction.rs:22: netlink::Report,\ndrivers/android/binder/transaction.rs-23- node::{Node, NodeRef},\n" }
11/2	2026/09/27 07:57	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 8758 output: 18 thoughts: 65 Thoughts: Here's my take on those files... Digging into the Binder Driver Implementation Okay, my initial focus is on `drivers/android/binder/netlink.rs` and `drivers/android/binder/transaction.rs`. Straight away, I'm thinking about how the binder IPC mechanism interacts with the kernel's netlink interface and transaction handling. Time to dive into the code... I immediately want to understand how these rust implementations map to the core kernel functionality. I'm going to quickly search for how they're constructing messages, so I will start by looking for usages of `put_u32`, `put_string`, `put_flag`, or any other `GenlMsg` methods in the kernel codebase. This will give me a better understanding of how the binder driver is serializing and deserializing data for netlink communication. This should provide a good entry point to understand the data structures being exchanged and, ultimately, the logic driving the IPC system. Let's see what we can find!
12/2	2026/09/27 07:57	tool	grepper	0m Args: { "Expression": "\\bput_" } Results: { "Output": "\nFull output is too long, showing 500 out of 63299 lines.\nUse more precise expression if possible.\n\nDocumentation/RCU/listRCU.rst=65=grace periods elapse, with the help of call_rcu(), which is invoked via\nDocumentation/RCU/listRCU.rst:66:put_task_struct_rcu_user(). This deferring of destruction ensures that\nDocumentation/RCU/listRCU.rst-67-any readers traversing the list will see valid ``p-\u003etasks.next`` pointers\n--\nDocumentation/RCU/rculist_nulls.rst=22=objects, which is having below type.\n--\nDocumentation/RCU/rculist_nulls.rst-50- if (obj-\u003ekey != key) { // not the object we expected\nDocumentation/RCU/rculist_nulls.rst:51: put_ref(obj);\nDocumentation/RCU/rculist_nulls.rst-52- rcu_read_unlock();\n--\nDocumentation/RCU/rculist_nulls.rst=125=very very fast (before the end of RCU grace period)\n--\nDocumentation/RCU/rculist_nulls.rst-128-\nDocumentation/RCU/rculist_nulls.rst:129: if (put_last_reference_on(obj) {\nDocumentation/RCU/rculist_nulls.rst-130- lock_chain(); // typically a spin_lock()\n--\nDocumentation/RCU/rculist_nulls.rst=155=Note that using hlist_nulls means the type of 'obj_node' field of\n--\nDocumentation/RCU/rculist_nulls.rst-173- if (obj-\u003ekey != key) { // not the object we expected\nDocumentation/RCU/rculist_nulls.rst:174: put_ref(obj);\nDocumentation/RCU/rculist_nulls.rst-175-\trcu_read_unlock();\n--\nDocumentation/RCU/rculist_nulls.rst-185- if (get_nulls_value(node) != slot) {\nDocumentation/RCU/rculist_nulls.rst:186: put_ref(obj);\nDocumentation/RCU/rculist_nulls.rst-187- rcu_read_unlock();\n--\nDocumentation/arch/arm64/ptdump.rst=18=read mode, ``mem_hotplug_lock`` supports an efficient implementation of\nDocumentation/arch/arm64/ptdump.rst:19:``get_online_mems()`` and ``put_online_mems()``. These protect the\nDocumentation/arch/arm64/ptdump.rst-20-offlining of memory being accessed by the ptdump code.\n--\nDocumentation/core-api/kref.rst=174=For instance::\n--\nDocumentation/core-api/kref.rst-203-\nDocumentation/core-api/kref.rst:204:\tstatic void put_entry(struct my_data entry)\nDocumentation/core-api/kref.rst-205-\t{\n--\nDocumentation/core-api/kref.rst=214=pointless to do so). You could use kref_put() as follows::\n--\nDocumentation/core-api/kref.rst-220-\nDocumentation/core-api/kref.rst:221:\tstatic void put_entry(struct my_data entry)\nDocumentation/core-api/kref.rst-222-\t{\n--\nDocumentation/core-api/kref.rst=238=the following way::\n--\nDocumentation/core-api/kref.rst-262-\nDocumentation/core-api/kref.rst:263:\tstatic void put_entry(struct my_data entry)\nDocumentation/core-api/kref.rst-264-\t{\n--\nDocumentation/core-api/kref.rst-267-\nDocumentation/core-api/kref.rst:268:Which is useful to remove the mutex lock around kref_put() in put_entry(), but\nDocumentation/core-api/kref.rst-269-it's important that kref_get_unless_zero is enclosed in the same critical\n--\nDocumentation/core-api/kref.rst=280=locking for lookups in the above example::\n--\nDocumentation/core-api/kref.rst-313-\nDocumentation/core-api/kref.rst:314:\tstatic void put_entry(struct my_data entry)\nDocumentation/core-api/kref.rst-315-\t{\n--\nDocumentation/core-api/local_ops.rst=101=Counting is done on all the bits of a signed long.\nDocumentation/core-api/local_ops.rst-102-\nDocumentation/core-api/local_ops.rst:103:In preemptible context, use ``get_cpu_var()`` and ``put_cpu_var()`` around\nDocumentation/core-api/local_ops.rst-104-local atomic operations: it makes sure that preemption is disabled around write\nDocumentation/core-api/local_ops.rst=105=access to the per cpu variable. For instance::\n--\nDocumentation/core-api/local_ops.rst-107- local_inc(\u0026get_cpu_var(counters));\nDocumentation/core-api/local_ops.rst:108: put_cpu_var(counters);\nDocumentation/core-api/local_ops.rst-109-\n--\nDocumentation/core-api/local_ops.rst=136=Here is a sample module which implements a basic per cpu counter using\n--\nDocumentation/core-api/local_ops.rst-163- * local_inc(\u0026get_cpu_var(counters));\nDocumentation/core-api/local_ops.rst:164: * put_cpu_var(counters);\nDocumentation/core-api/local_ops.rst-165- /\n--\nDocumentation/core-api/memory-hotplug.rst=192=In addition, mem_hotplug_lock (in contrast to device_hotplug_lock) in read\nDocumentation/core-api/memory-hotplug.rst:193:mode allows for a quite efficient get_online_mems/put_online_mems\nDocumentation/core-api/memory-hotplug.rst-194-implementation, so code accessing memory can protect from that memory\n--\nDocumentation/core-api/pin_user_pages.rst=194=INCORRECT (uses FOLL_GET calls):\n--\nDocumentation/core-api/pin_user_pages.rst-196- write to the data within the pages\nDocumentation/core-api/pin_user_pages.rst:197: put_page()\nDocumentation/core-api/pin_user_pages.rst-198-\n--\nDocumentation/core-api/this_cpu_ops.rst=99=register::\n--\nDocumentation/core-api/this_cpu_ops.rst-106-\t(y)++;\nDocumentation/core-api/this_cpu_ops.rst:107:\tput_cpu();\nDocumentation/core-api/this_cpu_ops.rst-108-\n--\nDocumentation/core-api/this_cpu_ops.rst=136=processor. this_cpu_ptr avoids multiple steps that the common\nDocumentation/core-api/this_cpu_ops.rst:137:get_cpu/put_cpu sequence requires. No processor number is\nDocumentation/core-api/this_cpu_ops.rst-138-available. Instead, the offset of the local per cpu area is simply\n--\nDocumentation/core-api/unaligned-memory-access.rst=205=The easiest way to avoid unaligned access is to use the get_unaligned() and\nDocumentation/core-api/unaligned-memory-access.rst:206:put_unaligned() macros provided by the \u003clinux/unaligned.h\u003e header file.\nDocumentation/core-api/unaligned-memory-access.rst-207-\n--\nDocumentation/core-api/unaligned-memory-access.rst=218=To avoid the unaligned memory access, you would rewrite it as follows::\n--\nDocumentation/core-api/unaligned-memory-access.rst-223-\t\tvalue = cpu_to_le32(value);\nDocumentation/core-api/unaligned-memory-access.rst:224:\t\tput_unaligned(value, (u32 ) data);\nDocumentation/core-api/unaligned-memory-access.rst-225-\t\t[...]\n--\nDocumentation/core-api/watch_queue.rst=128=a watch. These can be managed with:\n--\nDocumentation/core-api/watch_queue.rst-136-\nDocumentation/core-api/watch_queue.rst:137: ``void put_watch_queue(struct watch_queue wqueue);``\nDocumentation/core-api/watch_queue.rst-138-\n--\nDocumentation/driver-api/driver-model/device.rst=22=A device is removed from the core when its reference count goes to\n--\nDocumentation/driver-api/driver-model/device.rst-25- struct device get_device(struct device * dev);\nDocumentation/driver-api/driver-model/device.rst:26: void put_device(struct device * dev);\nDocumentation/driver-api/driver-model/device.rst-27-\n--\nDocumentation/driver-api/ioctl.rst=95=as the structure matches neither the kernel's timespec64 nor the user\nDocumentation/driver-api/ioctl.rst:96:space timespec exactly. The get_timespec64() and put_timespec64() helper\nDocumentation/driver-api/ioctl.rst-97-functions can be used to ensure that the layout remains compatible with\n--\nDocumentation/driver-api/ipmi.rst=655=Note that the dev pointer is included in the above structure, and\nDocumentation/driver-api/ipmi.rst:656:assuming ipmi_smi_get_info returns success, you must call put_device\nDocumentation/driver-api/ipmi.rst-657-on the dev pointer.\n--\nDocumentation/driver-api/media/v4l2-device.rst=75=You can iterate over all registered devices as follows:\n--\nDocumentation/driver-api/media/v4l2-device.rst-99-\t\terr = driver_for_each_device(drv, NULL, p, callback);\nDocumentation/driver-api/media/v4l2-device.rst:100:\t\tput_driver(drv);\nDocumentation/driver-api/media/v4l2-device.rst-101-\t\treturn err;\n--\nDocumentation/filesystems/files.rst=16=refcounting model in the kernel, the last task doing\nDocumentation/filesystems/files.rst:17:a put_files_struct() frees the file descriptor (fd) table.\nDocumentation/filesystems/files.rst-18-The files (struct file) themselves are protected using\n--\nDocumentation/filesystems/iomap/operations.rst=52=The following address space operations can be wrapped easily:\n--\nDocumentation/filesystems/iomap/operations.rst-67- unsigned len);\nDocumentation/filesystems/iomap/operations.rst:68: void (put_folio)(struct inode inode, loff_t pos, unsigned copied,\nDocumentation/filesystems/iomap/operations.rst-69- struct folio folio);\n--\nDocumentation/filesystems/iomap/operations.rst=75=iomap calls these functions:\n--\nDocumentation/filesystems/iomap/operations.rst-84-\nDocumentation/filesystems/iomap/operations.rst:85: - ``put_folio``: Called to unlock and put a folio after a pagecache\nDocumentation/filesystems/iomap/operations.rst-86- operation completes.\n--\nDocumentation/filesystems/journalling.rst=67=checkpoint all your transactions.\nDocumentation/filesystems/journalling.rst-68-\nDocumentation/filesystems/journalling.rst:69:Then at umount time , in your put_super() you can then call\nDocumentation/filesystems/journalling.rst-70-jbd2_journal_destroy() to clean up your in-core journal object.\n--\nDocumentation/filesystems/locking.rst=169=prototypes::\n--\nDocumentation/filesystems/locking.rst-177-\tvoid (evict_inode) (struct inode );\nDocumentation/filesystems/locking.rst:178:\tvoid (put_super) (struct super_block );\nDocumentation/filesystems/locking.rst-179-\tint (sync_fs)(struct super_block sb, int wait);\n--\nDocumentation/filesystems/locking.rst=200=evict_inode:\nDocumentation/filesystems/locking.rst:201:put_super:\t\twrite\nDocumentation/filesystems/locking.rst-202-sync_fs:\t\tread\n--\nDocumentation/filesystems/mount_api.rst=189=The mount context is created by calling vfs_new_fs_context() or\nDocumentation/filesystems/mount_api.rst:190:vfs_dup_fs_context() and is destroyed with put_fs_context(). Note that the\nDocumentation/filesystems/mount_api.rst-191-structure is not refcounted.\n--\nDocumentation/filesystems/mount_api.rst=222=manage the filesystem context. They are as follows:\n--\nDocumentation/filesystems/mount_api.rst-241-\nDocumentation/filesystems/mount_api.rst:242: Note that even if this fails, put_fs_context() will be called\nDocumentation/filesystems/mount_api.rst-243-\t immediately thereafter, so -\u003edup() must* make the\n--\nDocumentation/filesystems/mount_api.rst=401=destroying a context:\n--\nDocumentation/filesystems/mount_api.rst-456-\nDocumentation/filesystems/mount_api.rst:457: void put_fs_context(struct fs_context fc);\nDocumentation/filesystems/mount_api.rst-458-\n--\nDocumentation/filesystems/path-lookup.rst=1069=holding no counted reference, only the RCU lock. A callback\nDocumentation/filesystems/path-lookup.rst-1070-``struct delayed_called`` will be passed to ``-\u003eget_link()``:\nDocumentation/filesystems/path-lookup.rst:1071:file systems can set their own put_link function and argument through\nDocumentation/filesystems/path-lookup.rst-1072-set_delayed_call(). Later on, when VFS wants to put link, it will call\n--\nDocumentation/filesystems/porting.rst=605=nd_[gs]et_link() is gone.\n--\nDocumentation/filesystems/porting.rst-610-\nDocumentation/filesystems/porting.rst:611:calling conventions for -\u003eput_link() have changed. It gets inode instead of\nDocumentation/filesystems/porting.rst-612-dentry, it does not get nameidata at all and it gets called only when cookie\n--\nDocumentation/filesystems/porting.rst=643=set_delayed_call() where it used to set ``cookie``.\nDocumentation/filesystems/porting.rst-644-\nDocumentation/filesystems/porting.rst:645:-\u003eput_link() is gone - just give the destructor to set_delayed_call()\nDocumentation/filesystems/porting.rst-646-in -\u003eget_link().\n--\nDocumentation/filesystems/vfs.rst=178=filesystem. The following members are defined:\n--\nDocumentation/filesystems/vfs.rst-190-\t\tvoid (evict_inode) (struct inode );\nDocumentation/filesystems/vfs.rst:191:\t\tvoid (put_super) (struct super_block );\nDocumentation/filesystems/vfs.rst-192-\t\tint (sync_fs)(struct super_block sb, int wait);\n--\nDocumentation/filesystems/vfs.rst=220=or bottom half).\n--\nDocumentation/filesystems/vfs.rst-263-\tThe \"inode_just_drop()\" behavior is equivalent to the old\nDocumentation/filesystems/vfs.rst:264:\tpractice of using \"force_delete\" in the put_inode() case, but\nDocumentation/filesystems/vfs.rst-265-\tdoes not have the races that the \"force_delete()\" approach had.\n--\nDocumentation/filesystems/vfs.rst-273-\nDocumentation/filesystems/vfs.rst:274:``put_super``\nDocumentation/filesystems/vfs.rst-275-\tcalled when the VFS wishes to free the superblock\n--\nDocumentation/gpu/drm-vm-bind-locking.rst=200=following:\n--\nDocumentation/gpu/drm-vm-bind-locking.rst-214- dma_resv_unlock(\u0026obj-\u003eresv);\nDocumentation/gpu/drm-vm-bind-locking.rst:215: put_object(obj);\nDocumentation/gpu/drm-vm-bind-locking.rst-216-\n--\nDocumentation/gpu/drm-vm-bind-locking.rst=301=And the corresponding shared-object aware eviction would look like:\n--\nDocumentation/gpu/drm-vm-bind-locking.rst-318- dma_resv_unlock(\u0026obj-\u003eresv);\nDocumentation/gpu/drm-vm-bind-locking.rst:319: put_object(obj);\nDocumentation/gpu/drm-vm-bind-locking.rst-320-\n--\nDocumentation/infiniband/user_verbs.rst=47=Memory pinning\n--\nDocumentation/infiniband/user_verbs.rst-52- ib_uverbs module manages pinning and unpinning memory regions via\nDocumentation/infiniband/user_verbs.rst:53: get_user_pages() and put_page() calls. It also accounts for the\nDocumentation/infiniband/user_verbs.rst-54- amount of memory pinned in the process's pinned_vm, and checks that\n--\nDocumentation/kernel-hacking/hacking.rst=257=overruns. Make sure that will be enough.\n--\nDocumentation/kernel-hacking/hacking.rst-269-\nDocumentation/kernel-hacking/hacking.rst:270:copy_to_user() / copy_from_user() / get_user() / put_user()\nDocumentation/kernel-hacking/hacking.rst-271------------------------------------------------------------\n--\nDocumentation/kernel-hacking/hacking.rst=273=Defined in ``include/linux/uaccess.h`` / ``asm/uaccess.h``\n--\nDocumentation/kernel-hacking/hacking.rst-276-\nDocumentation/kernel-hacking/hacking.rst:277:put_user() and get_user() are used to get\nDocumentation/kernel-hacking/hacking.rst-278-and put single values (such as an int, char, or long) from and to\n--\nDocumentation/kernel-hacking/hacking.rst=285=userspace.\n--\nDocumentation/kernel-hacking/hacking.rst-288-\nDocumentation/kernel-hacking/hacking.rst:289: Unlike put_user() and get_user(), they\nDocumentation/kernel-hacking/hacking.rst-290- return the amount of uncopied data (ie. 0 still means success).\n--\nDocumentation/kernel-hacking/hacking.rst=415=moved to another CPU) and returns the current processor number, between\nDocumentation/kernel-hacking/hacking.rst-416-0 and ``NR_CPUS``. Note that the CPU numbers are not necessarily\nDocumentation/kernel-hacking/hacking.rst:417:continuous. You return it again with put_cpu() when you\nDocumentation/kernel-hacking/hacking.rst-418-are done.\n--\nDocumentation/kernel-hacking/locking.rst=1257=DEFINE_PER_CPU(), get_cpu_var() and\nDocumentation/kernel-hacking/locking.rst:1258:put_cpu_var() (``include/linux/percpu.h``).\nDocumentation/kernel-hacking/locking.rst-1259-\n--\nDocumentation/kernel-hacking/locking.rst=1308=from user context, and can sleep.\n--\nDocumentation/kernel-hacking/locking.rst-1317-\nDocumentation/kernel-hacking/locking.rst:1318: - put_user()\nDocumentation/kernel-hacking/locking.rst-1319-\n--\nDocumentation/locking/preempt-locking.rst=35=protect these situations by disabling preemption around them.\nDocumentation/locking/preempt-locking.rst-36-\nDocumentation/locking/preempt-locking.rst:37:You can also use put_cpu() and get_cpu(), which will disable preemption.\nDocumentation/locking/preempt-locking.rst-38-\n--\nDocumentation/mm/hugetlbfs_reserv.rst=312=huge pages. If they can not be reserved, the mount fails.\nDocumentation/mm/hugetlbfs_reserv.rst-313-\nDocumentation/mm/hugetlbfs_reserv.rst:314:The routines hugepage_subpool_get/put_pages() are called when pages are\nDocumentation/mm/hugetlbfs_reserv.rst-315-obtained from or released back to a subpool. They perform all subpool\nDocumentation/mm/hugetlbfs_reserv.rst=316=accounting, and track any reservations associated with the subpool.\nDocumentation/mm/hugetlbfs_reserv.rst:317:hugepage_subpool_get/put_pages are passed the number of huge pages by which\nDocumentation/mm/hugetlbfs_reserv.rst-318-to adjust the subpool 'used page' count (down for get, up for put). Normally,\n--\nDocumentation/mm/transhuge.rst=111=pages:\nDocumentation/mm/transhuge.rst-112-\nDocumentation/mm/transhuge.rst:113: - get_page()/put_page() and GUP operate on the folio-\u003e_refcount.\nDocumentation/mm/transhuge.rst-114-\n--\nDocumentation/security/credentials.rst=298=has _const_ pointers to its credential sets, as does struct file. Furthermore,\nDocumentation/security/credentials.rst:299:certain functions such as ``get_cred()`` and ``put_cred()`` operate on const\nDocumentation/security/credentials.rst-300-pointers, thus rendering casts unnecessary, but require to temporarily ditch\n--\nDocumentation/security/credentials.rst=351=supplementary groups list respectively.\nDocumentation/security/credentials.rst-352-\nDocumentation/security/credentials.rst:353:Once a reference has been obtained, it must be released with ``put_cred()``,\nDocumentation/security/credentials.rst:354:``free_uid()`` or ``put_group_info()`` as appropriate.\nDocumentation/security/credentials.rst-355-\n--\nDocumentation/security/credentials.rst=385=reference on them using::\n--\nDocumentation/security/credentials.rst-388-\nDocumentation/security/credentials.rst:389:This does all the RCU magic inside of it. The caller must call put_cred() on\nDocumentation/security/credentials.rst-390-the credentials so obtained when they're finished with.\n--\nDocumentation/security/credentials.rst=473=Note that this function consumes the caller's reference to the new credentials.\nDocumentation/security/credentials.rst:474:The caller should _not_ call ``put_cred()`` on the new credentials afterwards.\nDocumentation/security/credentials.rst-475-\n--\nDocumentation/security/credentials.rst=515=There are some functions to help manage credentials:\nDocumentation/security/credentials.rst-516-\nDocumentation/security/credentials.rst:517: - ``void put_cred(const struct cred cred);``\nDocumentation/security/credentials.rst-518-\n--\nDocumentation/trace/ftrace.rst=1933=Here is a trace with function-trace set::\n--\nDocumentation/trace/ftrace.rst-1974- kworker/-59 3d..2 5us : kthread_data \u003c-wq_worker_sleeping\nDocumentation/trace/ftrace.rst:1975: kworker/-59 3d..2 5us : put_prev_task_fair \u003c-__schedule\nDocumentation/trace/ftrace.rst-1976- kworker/-59 3d..2 6us : pick_next_task_fair \u003c-pick_next_task\n--\nDocumentation/trace/ftrace.rst=2164=Doing the same with chrt -r 5 and function-trace set.\n--\nDocumentation/trace/ftrace.rst-2264- \u003cidle\u003e-0 3dN.1 27us : add_preempt_count \u003c-_raw_spin_lock_irq\nDocumentation/trace/ftrace.rst:2265: \u003cidle\u003e-0 3dN.2 28us : put_prev_task_idle \u003c-__schedule\nDocumentation/trace/ftrace.rst-2266- \u003cidle\u003e-0 3dN.2 28us : pick_next_task_stop \u003c-pick_next_task\n--\nDocumentation/trace/ftrace.rst=3034=listed in:\n--\nDocumentation/trace/ftrace.rst-3040- # cat available_filter_functions\nDocumentation/trace/ftrace.rst:3041: put_prev_task_idle\nDocumentation/trace/ftrace.rst-3042- kmem_cache_create\n--\nDocumentation/translations/it_IT/kernel-hacking/hacking.rst=276=eventuali sforamenti. Accertatevi che vi basti.\n--\nDocumentation/translations/it_IT/kernel-hacking/hacking.rst-288-\nDocumentation/translations/it_IT/kernel-hacking/hacking.rst:289::c:func:`copy_to_user()` / :c:func:`copy_from_user()` / :c:func:`get_user()` / :c:func:`put_user()`\nDocumentation/translations/it_IT/kernel-hacking/hacking.rst-290----------------------------------------------------------------------------------------------------\n--\nDocumentation/translations/it_IT/kernel-hacking/hacking.rst=292=Definite in ``include/linux/uaccess.h`` / ``asm/uaccess.h``\n--\nDocumentation/translations/it_IT/kernel-hacking/hacking.rst-295-\nDocumentation/translations/it_IT/kernel-hacking/hacking.rst:296::c:func:`put_user()` e :c:func:`get_user()` sono usate per ricevere ed\nDocumentation/translations/it_IT/kernel-hacking/hacking.rst-297-impostare singoli valori (come int, char, o long) da e verso lo spazio utente.\n--\nDocumentation/translations/it_IT/kernel-hacking/hacking.rst=303=esse copiano una quantità arbitraria di dati da e verso lo spazio utente.\n--\nDocumentation/translations/it_IT/kernel-hacking/hacking.rst-306-\nDocumentation/translations/it_IT/kernel-hacking/hacking.rst:307: Al contrario di:c:func:`put_user()` e :c:func:`get_user()`, queste\nDocumentation/translations/it_IT/kernel-hacking/hacking.rst-308- funzioni ritornano la quantità di dati copiati (0 è comunque un successo).\n--\nDocumentation/translations/it_IT/kernel-hacking/hacking.rst=443=che la numerazione dei processori sia continua. Quando avete terminato,\nDocumentation/translations/it_IT/kernel-hacking/hacking.rst:444:ritornate allo stato precedente con :c:func:`put_cpu()`.\nDocumentation/translations/it_IT/kernel-hacking/hacking.rst-445-\n--\nDocumentation/translations/it_IT/kernel-hacking/locking.rst=1289=e quindi non sarebbe più necessaria la mutua esclusione. Vedere\nDocumentation/translations/it_IT/kernel-hacking/locking.rst:1290:DEFINE_PER_CPU(), get_cpu_var() e put_cpu_var()\nDocumentation/translations/it_IT/kernel-hacking/locking.rst-1291-(``include/linux/percpu.h``).\n--\nDocumentation/translations/it_IT/kernel-hacking/locking.rst=1346=dormire.\n--\nDocumentation/translations/it_IT/kernel-hacking/locking.rst-1355-\nDocumentation/translations/it_IT/kernel-hacking/locking.rst:1356: - put_user()\nDocumentation/translations/it_IT/kernel-hacking/locking.rst-1357-\n--\nDocumentation/translations/zh_CN/core-api/kref.rst=154=put::\n--\nDocumentation/translations/zh_CN/core-api/kref.rst-199-\nDocumentation/translations/zh_CN/core-api/kref.rst:200:\tstatic void put_entry(struct my_data entry)\nDocumentation/translations/zh_CN/core-api/kref.rst-201-\t{\n--\nDocumentation/translations/zh_CN/core-api/kref.rst-215-\nDocumentation/translations/zh_CN/core-api/kref.rst:216:\tstatic void put_entry(struct my_data entry)\nDocumentation/translations/zh_CN/core-api/kref.rst-217-\t{\n--\nDocumentation/translations/zh_CN/core-api/kref.rst-255-\nDocumentation/translations/zh_CN/core-api/kref.rst:256:\tstatic void put_entry(struct my_data entry)\nDocumentation/translations/zh_CN/core-api/kref.rst-257-\t{\n--\nDocumentation/translations/zh_CN/core-api/kref.rst-260-\nDocumentation/translations/zh_CN/core-api/kref.rst:261:这对于在put_entry()中移除kref_put()周围的mutex锁是很有用的，但是重要的是\nDocumentation/translations/zh_CN/core-api/kref.rst-262-kref_get_unless_zero被封装在查找表中的同一关键部分，否则kref_get_unless_zero\n--\nDocumentation/translations/zh_CN/core-api/kref.rst=267=Krefs和RCU\n--\nDocumentation/translations/zh_CN/core-api/kref.rst-303-\nDocumentation/translations/zh_CN/core-api/kref.rst:304:\tstatic void put_entry(struct my_data entry)\nDocumentation/translations/zh_CN/core-api/kref.rst-305-\t{\n--\nDocumentation/translations/zh_CN/core-api/local_ops.rst=51=UP之间没有不同的行为，在你的架构的 ``local.h`` 中包括 ``asm-generic/local.h``\n--\nDocumentation/translations/zh_CN/core-api/local_ops.rst-101-在可抢占的上下文中，围绕本地原子操作使用 ``get_cpu_var()`` 和\nDocumentation/translations/zh_CN/core-api/local_ops.rst:102:``put_cpu_var()`` ：它确保在对每个cpu变量进行写访问时，抢占被禁用。比如\nDocumentation/translations/zh_CN/core-api/local_ops.rst-103-说::\n--\nDocumentation/translations/zh_CN/core-api/local_ops.rst-105- local_inc(\u0026get_cpu_var(counters));\nDocumentation/translations/zh_CN/core-api/local_ops.rst:106: put_cpu_var(counters);\nDocumentation/translations/zh_CN/core-api/local_ops.rst-107-\n--\nDocumentation/translations/zh_CN/core-api/local_ops.rst-157- local_inc(\u0026get_cpu_var(counters));\nDocumentation/translations/zh_CN/core-api/local_ops.rst:158: * put_cpu_var(counters);\nDocumentation/translations/zh_CN/core-api/local_ops.rst-159- /\n--\nDocumentation/translations/zh_CN/core-api/memory-hotplug.rst=115=mem_hotplug_lock，以序列化内存热插拔（例如访问全局/区域变量）。\n--\nDocumentation/translations/zh_CN/core-api/memory-hotplug.rst-117-此外，mem_hotplug_lock（与device_hotplug_lock相反）在读取模式下允许一个相当\nDocumentation/translations/zh_CN/core-api/memory-hotplug.rst:118:有效的get_online_mems/put_online_mems实现，所以访问内存的代码可以防止该内存\nDocumentation/translations/zh_CN/core-api/memory-hotplug.rst-119-消失。\n--\nDocumentation/translations/zh_CN/core-api/this_cpu_ops.rst=63=this_cpu操作的内部工作\n--\nDocumentation/translations/zh_CN/core-api/this_cpu_ops.rst-100-\t(y)++;\nDocumentation/translations/zh_CN/core-api/this_cpu_ops.rst:101:\tput_cpu();\nDocumentation/translations/zh_CN/core-api/this_cpu_ops.rst-102-\n--\nDocumentation/translations/zh_CN/core-api/this_cpu_ops.rst-120-使用每CPU变量的偏移量(\u0026x!)，并返回属于当前执行处理器的每CPU变量的地址。\nDocumentation/translations/zh_CN/core-api/this_cpu_ops.rst:121:``this_cpu_ptr`` 避免了通用 ``get_cpu``/``put_cpu`` 序列所需的多个步骤。没有可用\nDocumentation/translations/zh_CN/core-api/this_cpu_ops.rst-122-的处理器编号。相反，本地每CPU区域的偏移量只是简单地添加到每CPU偏移量上。\n--\nDocumentation/translations/zh_CN/core-api/unaligned-memory-access.rst=90=field2会导致非对齐访问，这并不是不合理的。你会期望field2位于该结构体的2个字节的偏移\n--\nDocumentation/translations/zh_CN/core-api/unaligned-memory-access.rst-178-避免非对齐访问的最简单方法是使用\u003clinux/unaligned.h\u003e头文件提供的get_unaligned()和\nDocumentation/translations/zh_CN/core-api/unaligned-memory-access.rst:179:put_unaligned()宏。\nDocumentation/translations/zh_CN/core-api/unaligned-memory-access.rst-180-\n--\nDocumentation/translations/zh_CN/core-api/unaligned-memory-access.rst-195-\t\tvalue = cpu_to_le32(value);\nDocumentation/translations/zh_CN/core-api/unaligned-memory-access.rst:196:\t\tput_unaligned(value, (u32 ) data);\nDocumentation/translations/zh_CN/core-api/unaligned-memory-access.rst-197-\t\t[...]\n--\nDocumentation/translations/zh_CN/core-api/watch_queue.rst-125-\nDocumentation/translations/zh_CN/core-api/watch_queue.rst:126: ``void put_watch_queue(struct watch_queue wqueue);``\nDocumentation/translations/zh_CN/core-api/watch_queue.rst-127-\n--\nDocumentation/translations/zh_CN/infiniband/user_verbs.rst-53- 直接的用户空间I/O要求与作为潜在I/O目标的内存区域保持在同一物理地址上。ib_uverbs\nDocumentation/translations/zh_CN/infiniband/user_verbs.rst:54: 模块通过get_user_pages()和put_page()调用来管理内存区域的固定和解除固定。它还核\nDocumentation/translations/zh_CN/infiniband/user_verbs.rst-55- 算进程的pinned_vm中被固定的内存量，并检查非特权进程是否超过其RLIMIT_MEMLOCK限制。\n--\nDocumentation/translations/zh_CN/kernel-hacking/hacking.rst=172=Provide mechanism not policy”。\n--\nDocumentation/translations/zh_CN/kernel-hacking/hacking.rst-229-\nDocumentation/translations/zh_CN/kernel-hacking/hacking.rst:230::c:func:`copy_to_user()` / :c:func:`copy_from_user()` / :c:func:`get_user()` / :c:func:`put_user()`\nDocumentation/translations/zh_CN/kernel-hacking/hacking.rst-231----------------------------------------------------------------------------------------------------\n--\nDocumentation/translations/zh_CN/kernel-hacking/hacking.rst-236-\nDocumentation/translations/zh_CN/kernel-hacking/hacking.rst:237::c:func:`put_user()` 和 :c:func:`get_user()` 用于从用户空间中获取和向用户空\nDocumentation/translations/zh_CN/kernel-hacking/hacking.rst-238-间中传出单个值（如int、char或long）。指向用户空间的指针永远不应该直接取消\n--\nDocumentation/translations/zh_CN/kernel-hacking/hacking.rst-245-\nDocumentation/translations/zh_CN/kernel-hacking/hacking.rst:246: 与 :c:func:`put_user()` 和 :c:func:`get_user()` 不同，它们返回未复制的\nDocumentation/translations/zh_CN/kernel-hacking/hacking.rst-247- 数据量（即0仍然意味着成功）。\n--\nDocumentation/translations/zh_CN/kernel-hacking/hacking.rst=347=CPU上运行。\n--\nDocumentation/translations/zh_CN/kernel-hacking/hacking.rst-355-处理器号，介于0和 ``NR_CPUS`` 之间。请注意，CPU编号不一定是连续的。完成后，\nDocumentation/translations/zh_CN/kernel-hacking/hacking.rst:356:使用 :c:func:`put_cpu()` 再次返回。\nDocumentation/translations/zh_CN/kernel-hacking/hacking.rst-357-\n--\nDocumentation/translations/zh_CN/mm/hugetlbfs_reserv.rst=245=hugepage_subpool的min_hpages字段中被跟踪。在挂载时，hugetlb_acct_memory(min_hpages)\n--\nDocumentation/translations/zh_CN/mm/hugetlbfs_reserv.rst-247-\nDocumentation/translations/zh_CN/mm/hugetlbfs_reserv.rst:248:当从子池中获取或释放页面时，会调用hugepage_subpool_get/put_pages()函数。\nDocumentation/translations/zh_CN/mm/hugetlbfs_reserv.rst:249:hugepage_subpool_get/put_pages被传递给巨页数量，以此来调整子池的 “已用页面” 计数\nDocumentation/translations/zh_CN/mm/hugetlbfs_reserv.rst-250-（get为下降，put为上升）。通常情况下，如果子池中没有足够的页面，它们会返回与传递的相同的值或\n--\nDocumentation/translations/zh_CN/security/credentials.rst=215=task_struct中通过一个名为‘cred’的指针指向其凭据。\n--\nDocumentation/translations/zh_CN/security/credentials.rst-252-为了在编译时捕获意外的凭据修改，struct task_struct具有_const_指针指向其凭据集，\nDocumentation/translations/zh_CN/security/credentials.rst:253:struct file也是如此。此外，某些函数如 ``get_cred()`` 和 ``put_cred()`` 在\nDocumentation/translations/zh_CN/security/credentials.rst-254-const指针上操作，因此不需要进行类型转换，但需要临时放弃const限定，以便能够修改\n--\nDocumentation/translations/zh_CN/security/credentials.rst-298-\nDocumentation/translations/zh_CN/security/credentials.rst:299:一旦获得引用，就必须使用 ``put_cred（）``, ``free_uid（）`` 或\nDocumentation/translations/zh_CN/security/credentials.rst:300:``put_group_info（）`` 来适当释放它。\nDocumentation/translations/zh_CN/security/credentials.rst-301-\n--\nDocumentation/translations/zh_CN/security/credentials.rst-332-\nDocumentation/translations/zh_CN/security/credentials.rst:333:这个函数内部完成了所有的RCU操作。当使用完这些凭据时，调用方必须调用put_cred()\nDocumentation/translations/zh_CN/security/credentials.rst-334-函数释放它们。\n--\nDocumentation/translations/zh_CN/security/credentials.rst-399-请注意，该函数会消耗调用者对新凭据的引用。调用者在此之后不应调用\nDocumentation/translations/zh_CN/security/credentials.rst:400:``put_cred()`` 释放新凭据。\nDocumentation/translations/zh_CN/security/credentials.rst-401-\n--\nDocumentation/translations/zh_CN/security/credentials.rst-439-\nDocumentation/translations/zh_CN/security/credentials.rst:440: - ``void put_cred(const struct cred cred);``\nDocumentation/translations/zh_CN/security/credentials.rst-441-\n--\nDocumentation/translations/zh_CN/video4linux/v4l2-framework.txt=164=int iterate(void p)\n--\nDocumentation/translations/zh_CN/video4linux/v4l2-framework.txt-173-\terr = driver_for_each_device(drv, NULL, p, callback);\nDocumentation/translations/zh_CN/video4linux/v4l2-framework.txt:174:\tput_driver(drv);\nDocumentation/translations/zh_CN/video4linux/v4l2-framework.txt-175-\treturn err;\n--\narch/Kconfig=227=config HAVE_EFFICIENT_UNALIGNED_ACCESS\n--\narch/Kconfig-230-\t Some architectures are unable to perform unaligned accesses\narch/Kconfig:231:\t without the use of get_unaligned/put_unaligned. Others are\narch/Kconfig-232-\t unable to perform such accesses efficiently (e.g. trap on\n--\narch/alpha/include/asm/thread_info.h=45=register unsigned long current_stack_pointer __asm__ (\"$30\");\n--\narch/alpha/include/asm/thread_info.h-126-\t\tres \|= 4;\t\t\t\t\t\t\\\narch/alpha/include/asm/thread_info.h:127:\tput_user(res, (int __user )(value));\t\t\t\t\\\narch/alpha/include/asm/thread_info.h-128-\t})\n--\narch/alpha/include/asm/uaccess.h-17- /\narch/alpha/include/asm/uaccess.h:18:#define put_user(x, ptr) \\\narch/alpha/include/asm/uaccess.h-19- __put_user_check((__typeof__((ptr)))(x), (ptr), sizeof((ptr)))\n--\narch/alpha/kernel/osf_sys.c=112=osf_filldir(struct dir_context ctx, const char name, int namlen,\n--\narch/alpha/kernel/osf_sys.c-129-\tif (buf-\u003ebasep) {\n\n" }
13/2	2026/09/27 07:58	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 19785 output: 37 thoughts: 43 Thoughts: Okay, here's my take on those thoughts, framed as my own: Initial Investigation into Rust Kernel Networking Right, let's dive in. My immediate thought is to start a targeted search. I'm thinking I'll try the common path: focusing on Rust networking code within the kernel. Let's see if something exists under `rust/kernel/net`. I'm also remembering that the Android Binder driver has some netlink interaction, so a search for `drivers/android/binder/netlink.rs` might be more fruitful initially, as it's a very specific implementation I have in mind. Then, it's time to read through the contents of `drivers/android/binder/netlink.rs` to get a good understanding of what it contains.
14/2	2026/09/27 07:58	tool	read-file	0m Args: { "File": "drivers/android/binder/netlink.rs", "FirstLine": 1, "LineCount": 100 } Results: { "Contents": " 1:\t// SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)\n 2:\t/* Based on: Documentation/netlink/specs/binder.yaml /\n 3:\t\n 4:\t#![allow(unreachable_pub, clippy::wrong_self_convention)]\n 5:\tuse kernel::{\n 6:\t net::netlink::{\n 7:\t Family,\n 8:\t GenlMsg,\n 9:\t MulticastGroup,\n 10:\t NetlinkSkBuff, //\n 11:\t },\n 12:\t prelude::, //\n 13:\t};\n 14:\t\n 15:\tpub static BINDER_NL_FAMILY: Family = Family::const_new(\n 16:\t kernel::module::this_module::\u003ccrate::LocalModule\u003e(),\n 17:\t kernel::uapi::BINDER_FAMILY_NAME,\n 18:\t kernel::uapi::BINDER_FAMILY_VERSION,\n 19:\t \u0026BINDER_NL_FAMILY_MCGRPS,\n 20:\t);\n 21:\t\n 22:\tstatic BINDER_NL_FAMILY_MCGRPS: [MulticastGroup; 1] = [MulticastGroup::const_new(c\"report\")];\n 23:\t\n 24:\t/// A multicast event sent to userspace subscribers to notify them about\n 25:\t/// binder transaction failures. The generated report provides the full\n 26:\t/// details of the specific transaction that failed. The intention is for\n 27:\t/// programs to monitor these events and react to the failures as needed.\n 28:\tpub struct Report {\n 29:\t skb: GenlMsg,\n 30:\t}\n 31:\t\n 32:\timpl Report {\n 33:\t /// Create a new multicast message.\n 34:\t pub fn new(\n 35:\t size: usize,\n 36:\t portid: u32,\n 37:\t seq: u32,\n 38:\t flags: kernel::alloc::Flags,\n 39:\t ) -\u003e Result\u003cSelf, kernel::alloc::AllocError\u003e {\n 40:\t const BINDER_CMD_REPORT: u8 = kernel::uapi::BINDER_CMD_REPORT as u8;\n 41:\t let skb = NetlinkSkBuff::new(size, flags)?;\n 42:\t let skb = skb.genlmsg_put(portid, seq, \u0026BINDER_NL_FAMILY, BINDER_CMD_REPORT)?;\n 43:\t Ok(Self { skb })\n 44:\t }\n 45:\t\n 46:\t /// Broadcast this message.\n 47:\t pub fn multicast(self, portid: u32, flags: kernel::alloc::Flags) -\u003e Result {\n 48:\t self.skb.multicast(\u0026BINDER_NL_FAMILY, portid, 0, flags)\n 49:\t }\n 50:\t\n 51:\t /// Check if this message type has listeners.\n 52:\t pub fn has_listeners() -\u003e bool {\n 53:\t BINDER_NL_FAMILY.has_listeners(0)\n 54:\t }\n 55:\t\n 56:\t /// The enum binder_driver_return_protocol returned to the sender.\n 57:\t pub fn error(\u0026mut self, val: u32) -\u003e Result {\n 58:\t const BINDER_A_REPORT_ERROR: c_int = kernel::uapi::BINDER_A_REPORT_ERROR as c_int;\n 59:\t self.skb.put_u32(BINDER_A_REPORT_ERROR, val)\n 60:\t }\n 61:\t\n 62:\t /// The binder context where the transaction occurred.\n 63:\t pub fn context(\u0026mut self, val: \u0026CStr) -\u003e Result {\n 64:\t const BINDER_A_REPORT_CONTEXT: c_int = kernel::uapi::BINDER_A_REPORT_CONTEXT as c_int;\n 65:\t self.skb.put_string(BINDER_A_REPORT_CONTEXT, val)\n 66:\t }\n 67:\t\n 68:\t /// The PID of the sender process.\n 69:\t pub fn from_pid(\u0026mut self, val: u32) -\u003e Result {\n 70:\t const BINDER_A_REPORT_FROM_PID: c_int = kernel::uapi::BINDER_A_REPORT_FROM_PID as c_int;\n 71:\t self.skb.put_u32(BINDER_A_REPORT_FROM_PID, val)\n 72:\t }\n 73:\t\n 74:\t /// The TID of the sender thread.\n 75:\t pub fn from_tid(\u0026mut self, val: u32) -\u003e Result {\n 76:\t const BINDER_A_REPORT_FROM_TID: c_int = kernel::uapi::BINDER_A_REPORT_FROM_TID as c_int;\n 77:\t self.skb.put_u32(BINDER_A_REPORT_FROM_TID, val)\n 78:\t }\n 79:\t\n 80:\t /// The PID of the recipient process. This attribute may not be present\n 81:\t /// if the target could not be determined.\n 82:\t pub fn to_pid(\u0026mut self, val: u32) -\u003e Result {\n 83:\t const BINDER_A_REPORT_TO_PID: c_int = kernel::uapi::BINDER_A_REPORT_TO_PID as c_int;\n 84:\t self.skb.put_u32(BINDER_A_REPORT_TO_PID, val)\n 85:\t }\n 86:\t\n 87:\t /// The TID of the recipient thread. This attribute may not be present\n 88:\t /// if the target could not be determined.\n 89:\t pub fn to_tid(\u0026mut self, val: u32) -\u003e Result {\n 90:\t const BINDER_A_REPORT_TO_TID: c_int = kernel::uapi::BINDER_A_REPORT_TO_TID as c_int;\n 91:\t self.skb.put_u32(BINDER_A_REPORT_TO_TID, val)\n 92:\t }\n 93:\t\n 94:\t /// When present, indicates the failed transaction is a reply.\n 95:\t pub fn is_reply(\u0026mut self) -\u003e Result {\n 96:\t const BINDER_A_REPORT_IS_REPLY: c_int = kernel::uapi::BINDER_A_REPORT_IS_REPLY as c_int;\n 97:\t self.skb.put_flag(BINDER_A_REPORT_IS_REPLY)\n 98:\t }\n 99:\t\n 100:\t /// The bitmask of enum transaction_flags from the transaction.\n" }
15/2	2026/09/27 07:58	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 21828 output: 38 thoughts: 19 Thoughts: Okay, let's dive into this. Here's my take on those lines of thought, framed as my own: Analyzing `drivers/android/binder/netlink.rs` for Potential Issues Alright, I'm at the point where I need to systematically review the remaining code in `drivers/android/binder/netlink.rs`. I know this area, and I'm aware of the kinds of tricky concurrency issues and potential race conditions that can lurk in netlink-based communication, especially when dealing with the intricacies of Binder and Android's IPC mechanisms. My focus is on identifying any potential vulnerabilities or bottlenecks that might have been missed in earlier reviews. I'm looking for anything that could lead to deadlocks, data corruption, or even denial-of-service scenarios. I need to ensure the netlink interaction is thread-safe, efficient, and robust under a variety of load conditions. I'm keeping a sharp eye out for anything that violates established best practices for netlink programming within a kernel context. Let's see what we've got.
16/2	2026/09/27 07:58	tool	read-file	0m Args: { "File": "drivers/android/binder/netlink.rs", "FirstLine": 101, "LineCount": 60 } Results: { "Contents": " 101:\t pub fn flags(\u0026mut self, val: u32) -\u003e Result {\n 102:\t const BINDER_A_REPORT_FLAGS: c_int = kernel::uapi::BINDER_A_REPORT_FLAGS as c_int;\n 103:\t self.skb.put_u32(BINDER_A_REPORT_FLAGS, val)\n 104:\t }\n 105:\t\n 106:\t /// The application-defined code from the transaction.\n 107:\t pub fn code(\u0026mut self, val: u32) -\u003e Result {\n 108:\t const BINDER_A_REPORT_CODE: c_int = kernel::uapi::BINDER_A_REPORT_CODE as c_int;\n 109:\t self.skb.put_u32(BINDER_A_REPORT_CODE, val)\n 110:\t }\n 111:\t\n 112:\t /// The transaction payload size in bytes.\n 113:\t pub fn data_size(\u0026mut self, val: u32) -\u003e Result {\n 114:\t const BINDER_A_REPORT_DATA_SIZE: c_int = kernel::uapi::BINDER_A_REPORT_DATA_SIZE as c_int;\n 115:\t self.skb.put_u32(BINDER_A_REPORT_DATA_SIZE, val)\n 116:\t }\n 117:\t}\n" }
17/2	2026/09/27 07:58	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 22496 output: 28 thoughts: 16 Thoughts: Here's my take on those thoughts, tailored for an expert audience: Diving into the `transaction.rs` Implementation Okay, so I need to understand the interaction between `transaction.rs` and `Report`. We're dealing with transactions here, so the `Report` object likely plays a crucial role in documenting, validating, or potentially reverting actions within a transaction. I'm guessing that `transaction.rs` orchestrates the execution of operations, and the `Report` captures the outcome, maybe for logging, auditing, or ensuring atomicity. I need to figure out how it's used. Is the `Report` created before, during, or after transaction execution? Does it store successes, failures, or both? Are there specific error codes or data structures within `Report` that `transaction.rs` leverages to handle different failure modes and rollback strategies? I'm anticipating that `Report` might be passed around as a mutable reference within the transaction context. Let's dig in and see exactly how they mesh.
18/2	2026/09/27 07:58	tool	grepper	0m Args: { "Expression": "Report::", "PathPrefix": "drivers/android/binder/" } Results: { "Output": "drivers/android/binder/transaction.rs=94= fn report_netlink_inner(\u0026self, reply: u32, ctx: \u0026crate::Context) -\u003e kernel::error::Result {\ndrivers/android/binder/transaction.rs:95: if !Report::has_listeners() {\ndrivers/android/binder/transaction.rs-96- return Ok(());\ndrivers/android/binder/transaction.rs-97- }\ndrivers/android/binder/transaction.rs:98: let mut report = Report::new(GENLMSG_DEFAULT_SIZE, 0, 0, GFP_KERNEL)?;\ndrivers/android/binder/transaction.rs-99-\n" }
19/2	2026/09/27 07:58	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 22928 output: 36 thoughts: 21 Thoughts: Okay, here's my interpretation of that thought process, tailored for an expert audience, and written in the first person: Diving into Binder Transaction Handling Alright, time to dig into the nitty-gritty. I'm focusing on `drivers/android/binder/transaction.rs`, specifically around line 94. My initial thought is probably directed at trying to understand the control flow, error handling or maybe even the data structures related to inter-process communication within the Binder framework. I'm likely interested in a specific aspect, like how a transaction is initiated, how arguments are marshalled or unmarshalled, or perhaps even how the kernel handles the eventual delivery of the transaction data to the target process. I expect to find some key structs or functions that deal with the core logic of a Binder transaction. I might be looking for clues about the use of memory regions, shared memory, or any specific optimizations in place for high-performance IPC. The `transaction.rs` file should contain the crucial building blocks for this communication paradigm. I hope I can grasp the nuances of the Binder transaction process better with this reading.
20/2	2026/09/27 07:58	tool	read-file	0m Args: { "File": "drivers/android/binder/transaction.rs", "FirstLine": 90, "LineCount": 60 } Results: { "Contents": " 90:\t );\n 91:\t }\n 92:\t }\n 93:\t\n 94:\t fn report_netlink_inner(\u0026self, reply: u32, ctx: \u0026crate::Context) -\u003e kernel::error::Result {\n 95:\t if !Report::has_listeners() {\n 96:\t return Ok(());\n 97:\t }\n 98:\t let mut report = Report::new(GENLMSG_DEFAULT_SIZE, 0, 0, GFP_KERNEL)?;\n 99:\t\n 100:\t report.error(reply)?;\n 101:\t report.context(\u0026ctx.name)?;\n 102:\t report.from_pid(self.from_pid as u32)?;\n 103:\t report.from_tid(self.from_tid as u32)?;\n 104:\t if self.to_pid != 0 {\n 105:\t report.to_pid(self.to_pid as u32)?;\n 106:\t }\n 107:\t if self.to_tid != 0 {\n 108:\t report.to_tid(self.to_tid as u32)?;\n 109:\t }\n 110:\t\n 111:\t if self.is_reply {\n 112:\t report.is_reply()?;\n 113:\t }\n 114:\t report.flags(u32::from(self.flags))?;\n 115:\t report.code(self.code)?;\n 116:\t report.data_size(self.data_size as u32)?;\n 117:\t\n 118:\t report.multicast(0, GFP_KERNEL)?;\n 119:\t Ok(())\n 120:\t }\n 121:\t}\n 122:\t\n 123:\tuse core::mem::offset_of;\n 124:\tuse kernel::bindings::rb_transaction_layout;\n 125:\tpub(crate) const TRANSACTION_LAYOUT: rb_transaction_layout = rb_transaction_layout {\n 126:\t debug_id: offset_of!(Transaction, debug_id),\n 127:\t code: offset_of!(Transaction, code),\n 128:\t flags: offset_of!(Transaction, flags),\n 129:\t from_thread: offset_of!(Transaction, from),\n 130:\t to_proc: offset_of!(Transaction, to),\n 131:\t target_node: offset_of!(Transaction, target_node),\n 132:\t};\n 133:\t\n 134:\t#[pin_data(PinnedDrop)]\n 135:\tpub(crate) struct Transaction {\n 136:\t pub(crate) debug_id: usize,\n 137:\t target_node: Option\u003cDArc\u003cNode\u003e\u003e,\n 138:\t pub(crate) from_parent: Option\u003cDArc\u003cTransaction\u003e\u003e,\n 139:\t pub(crate) from: Arc\u003cThread\u003e,\n 140:\t pub(crate) to: Arc\u003cProcess\u003e,\n 141:\t #[pin]\n 142:\t allocation: SpinLock\u003cOption\u003cAllocation\u003e\u003e,\n 143:\t is_outstanding: Atomic\u003cbool\u003e,\n 144:\t code: u32,\n 145:\t pub(crate) flags: TransactionFlags,\n 146:\t data_size: usize,\n 147:\t offsets_size: usize,\n 148:\t data_address: usize,\n 149:\t sender_euid: Kuid,\n" }
21/2	2026/09/27 07:58	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 24176 output: 27 thoughts: 68 Thoughts: Investigating the Rust Binder Implementation Okay, let's dive in. I need to clarify something first – is `drivers/android/binder` referencing the Rust implementation of Binder, or is this the older C version? My instinct is telling me to double check within the kernel configuration, see how this Rust Binder is actually enabled. Let's start by scrutinizing the Kconfig options. I need to determine the specific flags and dependencies that govern the presence and configuration of the Rust Binder implementation. My immediate action is to search through the Kconfig files for any mention of `rust_binder` or, failing that, a direct reference to `drivers/android/binder`. That should quickly uncover the relevant settings.
22/2	2026/09/27 07:58	tool	grepper	0m Args: { "Expression": "ANDROID_BINDER", "PathPrefix": "drivers/android" } Results: { "Output": "drivers/android/Kconfig=2=menu \"Android\"\ndrivers/android/Kconfig-3-\ndrivers/android/Kconfig:4:config ANDROID_BINDER_IPC\ndrivers/android/Kconfig-5-\tbool \"Android Binder IPC Driver\"\n--\ndrivers/android/Kconfig-16-\ndrivers/android/Kconfig:17:config ANDROID_BINDER_IPC_RUST\ndrivers/android/Kconfig-18-\tbool \"Rust version of Android Binder IPC Driver\"\ndrivers/android/Kconfig:19:\tdepends on RUST \u0026\u0026 MMU \u0026\u0026 NET \u0026\u0026 !ANDROID_BINDER_IPC\ndrivers/android/Kconfig-20-\thelp\n--\ndrivers/android/Kconfig-29-\ndrivers/android/Kconfig:30:config ANDROID_BINDERFS\ndrivers/android/Kconfig-31-\tbool \"Android Binderfs filesystem\"\ndrivers/android/Kconfig:32:\tdepends on ANDROID_BINDER_IPC\ndrivers/android/Kconfig-33-\tdefault n\n--\ndrivers/android/Kconfig-41-\ndrivers/android/Kconfig:42:config ANDROID_BINDER_DEVICES\ndrivers/android/Kconfig-43-\tstring \"Android Binder devices\"\ndrivers/android/Kconfig:44:\tdepends on ANDROID_BINDER_IPC \|\| ANDROID_BINDER_IPC_RUST\ndrivers/android/Kconfig-45-\tdefault \"binder,hwbinder,vndbinder\"\n--\ndrivers/android/Kconfig-53-\ndrivers/android/Kconfig:54:config ANDROID_BINDER_ALLOC_KUNIT_TEST\ndrivers/android/Kconfig-55-\ttristate \"KUnit Tests for Android Binder Alloc\" if !KUNIT_ALL_TESTS\ndrivers/android/Kconfig:56:\tdepends on ANDROID_BINDER_IPC \u0026\u0026 KUNIT\ndrivers/android/Kconfig-57-\tdefault KUNIT_ALL_TESTS\n--\ndrivers/android/Makefile=2=ccflags-y += -I$(src)\t\t\t# needed for trace events\ndrivers/android/Makefile-3-\ndrivers/android/Makefile:4:obj-$(CONFIG_ANDROID_BINDERFS)\t\t+= binderfs.o\ndrivers/android/Makefile:5:obj-$(CONFIG_ANDROID_BINDER_IPC)\t+= binder.o binder_alloc.o binder_netlink.o\ndrivers/android/Makefile:6:obj-$(CONFIG_ANDROID_BINDER_ALLOC_KUNIT_TEST)\t+= tests/\ndrivers/android/Makefile:7:obj-$(CONFIG_ANDROID_BINDER_IPC_RUST)\t+= binder/\n--\ndrivers/android/binder.c=121=module_param_named(debug_mask, binder_debug_mask, uint, 0644);\ndrivers/android/binder.c-122-\ndrivers/android/binder.c:123:char binder_devices_param = CONFIG_ANDROID_BINDER_DEVICES;\ndrivers/android/binder.c-124-module_param_named(devices, binder_devices_param, charp, 0444);\n--\ndrivers/android/binder.c=7106=static int __init binder_init(void)\n--\ndrivers/android/binder.c-7133-\ndrivers/android/binder.c:7134:\tif (!IS_ENABLED(CONFIG_ANDROID_BINDERFS) \u0026\u0026\ndrivers/android/binder.c-7135-\t strcmp(binder_devices_param, \"\") != 0) {\n--\ndrivers/android/binder/Makefile=2=ccflags-y += -I$(src)\t# needed for trace events\ndrivers/android/binder/Makefile-3-\ndrivers/android/binder/Makefile:4:obj-$(CONFIG_ANDROID_BINDER_IPC_RUST) += rust_binder.o\ndrivers/android/binder/Makefile-5-rust_binder-y := \\\n--\ndrivers/android/binder/rust_binderfs.c=49=DEFINE_SHOW_ATTRIBUTE(rust_binder_proc);\ndrivers/android/binder/rust_binderfs.c-50-\ndrivers/android/binder/rust_binderfs.c:51:char rust_binder_devices_param = CONFIG_ANDROID_BINDER_DEVICES;\ndrivers/android/binder/rust_binderfs.c-52-module_param_named(rust_devices, rust_binder_devices_param, charp, 0444);\n--\ndrivers/android/binder_internal.h=77=extern char binder_devices_param;\ndrivers/android/binder_internal.h-78-\ndrivers/android/binder_internal.h:79:#ifdef CONFIG_ANDROID_BINDERFS\ndrivers/android/binder_internal.h-80-extern bool is_binderfs_device(const struct inode inode);\n--\ndrivers/android/binder_internal.h=89=static inline struct dentry binderfs_create_file(struct dentry dir,\n--\ndrivers/android/binder_internal.h-97-\ndrivers/android/binder_internal.h:98:#ifdef CONFIG_ANDROID_BINDERFS\ndrivers/android/binder_internal.h-99-extern int __init init_binderfs(void);\n--\ndrivers/android/tests/.kunitconfig=5=CONFIG_KUNIT=y\ndrivers/android/tests/.kunitconfig:6:CONFIG_ANDROID_BINDER_IPC=y\ndrivers/android/tests/.kunitconfig:7:CONFIG_ANDROID_BINDER_ALLOC_KUNIT_TEST=y\n--\ndrivers/android/tests/Makefile-5-\ndrivers/android/tests/Makefile:6:obj-$(CONFIG_ANDROID_BINDER_ALLOC_KUNIT_TEST)\t+= binder_alloc_kunit.o\n" }
23/2	2026/09/27 07:58	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 25804 output: 24 thoughts: 57 Thoughts: Okay, let's see. My first thought is: I need to investigate the usage of `rust/kernel/net/netlink.rs` more broadly within this project. I want to understand if there are other, possibly indirect, dependencies on this file that I might be missing. I'm going to kick off a broader search to catch any uses of the path or the term more generally. Therefore, I should use `grep` or a similar tool to find all instances of either the literal string `rust/kernel/net/netlink` (and to be thorough), or just the more general term `netlink` across all the `.rs` files in the repository. This should give me a complete picture of where this module is being touched.
24/2	2026/09/27 07:58	tool	grepper	0m Args: { "Expression": "netlink", "PathPrefix": "rust/" } Results: { "Output": "rust/bindings/bindings_helper.h-97-#include \u003clinux/xarray.h\u003e\nrust/bindings/bindings_helper.h:98:#include \u003cnet/genetlink.h\u003e\nrust/bindings/bindings_helper.h:99:#include \u003cnet/netlink.h\u003e\nrust/bindings/bindings_helper.h-100-#include \u003ctrace/events/rust_sample.h\u003e\n--\nrust/helpers/helpers.c-77-#include \"mutex.c\"\nrust/helpers/helpers.c:78:#include \"net/genetlink.c\"\nrust/helpers/helpers.c-79-#include \"of.c\"\n--\nrust/helpers/net/genetlink.c-6-\nrust/helpers/net/genetlink.c:7:#include \u003cnet/genetlink.h\u003e\nrust/helpers/net/genetlink.c-8-\n--\nrust/kernel/net/mod.rs-7-\nrust/kernel/net/mod.rs:8:pub mod netlink;\n--\nrust/kernel/net/netlink.rs-4-\nrust/kernel/net/netlink.rs:5://! Rust support for generic netlink.\nrust/kernel/net/netlink.rs-6-//!\n--\nrust/kernel/net/netlink.rs-8-//!\nrust/kernel/net/netlink.rs:9://! C header: [`include/net/genetlink.h`](srctree/include/net/genetlink.h)\nrust/kernel/net/netlink.rs-10-\n--\nrust/kernel/net/netlink.rs-25-\nrust/kernel/net/netlink.rs:26:/// The default netlink message size.\nrust/kernel/net/netlink.rs-27-pub const GENLMSG_DEFAULT_SIZE: usize = bindings::GENLMSG_DEFAULT_SIZE;\nrust/kernel/net/netlink.rs-28-\nrust/kernel/net/netlink.rs:29:/// A wrapper around `struct sk_buff` for generic netlink messages.\nrust/kernel/net/netlink.rs-30-///\nrust/kernel/net/netlink.rs:31:/// This type is intended to be specific for buffers used with netlink only, and other usecases for\nrust/kernel/net/netlink.rs-32-/// `struct sk_buff` are out-of-scope for this abstraction.\n--\nrust/kernel/net/netlink.rs=43= pub fn new(size: usize, flags: alloc::Flags) -\u003e Result\u003cNetlinkSkBuff, AllocError\u003e {\n--\nrust/kernel/net/netlink.rs-49-\nrust/kernel/net/netlink.rs:50: /// Puts a generic netlink header into the `NetlinkSkBuff`.\nrust/kernel/net/netlink.rs-51- pub fn genlmsg_put(\n--\nrust/kernel/net/netlink.rs=67= fn drop(\u0026mut self) {\n--\nrust/kernel/net/netlink.rs-72-\nrust/kernel/net/netlink.rs:73:/// A generic netlink message being constructed.\nrust/kernel/net/netlink.rs-74-///\n--\nrust/kernel/net/netlink.rs-76-///\nrust/kernel/net/netlink.rs:77:/// `hdr` references the header in this netlink message.\nrust/kernel/net/netlink.rs-78-pub struct GenlMsg {\n--\nrust/kernel/net/netlink.rs=120= pub fn put_flag(\u0026mut self, attrtype: c_int) -\u003e Result {\n--\nrust/kernel/net/netlink.rs-126-\nrust/kernel/net/netlink.rs:127: /// Sends the generic netlink message as a multicast message.\nrust/kernel/net/netlink.rs-128- #[inline]\n--\nrust/kernel/net/netlink.rs=152= fn drop(\u0026mut self) {\nrust/kernel/net/netlink.rs:153: // SAFETY: The `hdr` pointer references the header of this generic netlink message.\nrust/kernel/net/netlink.rs-154- unsafe { bindings::genlmsg_cancel(self.skb.skb.as_ptr(), self.hdr.as_ptr()) };\n--\nrust/kernel/net/netlink.rs-157-\nrust/kernel/net/netlink.rs:158:/// Flags for a generic netlink family.\nrust/kernel/net/netlink.rs-159-struct FamilyFlags {\n--\nrust/kernel/net/netlink.rs=166=impl FamilyFlags {\n--\nrust/kernel/net/netlink.rs-187-\nrust/kernel/net/netlink.rs:188:/// A generic netlink family.\nrust/kernel/net/netlink.rs-189-#[repr(transparent)]\n--\nrust/kernel/net/netlink.rs=251= pub fn as_raw(\u0026self) -\u003e *mut bindings::genl_family {\n--\nrust/kernel/net/netlink.rs-255-\nrust/kernel/net/netlink.rs:256:/// A generic netlink multicast group.\nrust/kernel/net/netlink.rs-257-#[repr(transparent)]\n--\nrust/kernel/net/netlink.rs=270= pub const fn const_new(name: \u0026CStr) -\u003e MulticastGroup {\n--\nrust/kernel/net/netlink.rs-286-\nrust/kernel/net/netlink.rs:287:/// A registration of a generic netlink family.\nrust/kernel/net/netlink.rs-288-///\nrust/kernel/net/netlink.rs-289-/// This type represents the registration of a [`Family`]. When an instance of this type is\nrust/kernel/net/netlink.rs:290:/// dropped, its respective generic netlink family will be unregistered from the system.\nrust/kernel/net/netlink.rs-291-///\n--\nrust/kernel/net/netlink.rs=299=impl Family {\nrust/kernel/net/netlink.rs:300: /// Registers the generic netlink family with the kernel.\nrust/kernel/net/netlink.rs-301- pub fn register(\u0026'static self) -\u003e Result\u003cRegistration\u003e {\n--\nrust/kernel/net/netlink.rs=310= fn drop(\u0026mut self) {\n--\nrust/kernel/net/netlink.rs-317-\nrust/kernel/net/netlink.rs:318:#[macros::kunit_tests(rust_netlink)]\nrust/kernel/net/netlink.rs-319-mod tests {\n--\nrust/uapi/uapi_helper.h-12-#include \u003cuapi/linux/android/binder.h\u003e\nrust/uapi/uapi_helper.h:13:#include \u003cuapi/linux/android/binder_netlink.h\u003e\nrust/uapi/uapi_helper.h-14-#include \u003cuapi/linux/ioctl.h\u003e\n" }
25/2	2026/09/27 07:58	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 27795 output: 38 thoughts: 46 Thoughts: Okay, let's dive into this. Here's how I'd approach this task: Analyzing `rust/kernel/net/netlink.rs` Test Coverage Alright, I'm going to start by getting a handle on the test situation within `rust/kernel/net/netlink.rs`. My initial move would be to quickly scan the file, specifically looking for tests. I'd need to identify any tests present to understand the current testing strategy. Then, to understand the area of focus, I'll direct my attention to lines 315 onwards. I want to see what implementation, specific function or data structures are located from that line onwards in the file.
26/2	2026/09/27 07:58	tool	read-file	0m Args: { "File": "rust/kernel/net/netlink.rs", "FirstLine": 315, "LineCount": 80 } Results: { "Contents": " 315:\t }\n 316:\t}\n 317:\t\n 318:\t#[macros::kunit_tests(rust_netlink)]\n 319:\tmod tests {\n 320:\t use super::*;\n 321:\t\n 322:\t #[test]\n 323:\t fn test_family_flags_bitfield() {\n 324:\t for netnsok in [false, true] {\n 325:\t for parallel_ops in [false, true] {\n 326:\t let mut b_fam = bindings::genl_family {\n 327:\t ..Default::default()\n 328:\t };\n 329:\t b_fam.set_netnsok(if netnsok { 1 } else { 0 });\n 330:\t b_fam.set_parallel_ops(if parallel_ops { 1 } else { 0 });\n 331:\t\n 332:\t let c_bitfield = FamilyFlags {\n 333:\t netnsok,\n 334:\t parallel_ops,\n 335:\t }\n 336:\t .into_bitfield();\n 337:\t\n 338:\t // SAFETY: The bit field is stored as u8.\n 339:\t let b_val: u8 = unsafe { core::mem::transmute(b_fam._bitfield_1) };\n 340:\t // SAFETY: The bit field is stored as u8.\n 341:\t let c_val: u8 = unsafe { core::mem::transmute(c_bitfield) };\n 342:\t assert_eq!(b_val, c_val);\n 343:\t }\n 344:\t }\n 345:\t }\n 346:\t}\n" }
27/2	2026/09/27 07:58	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 28523 output: 35 thoughts: 93 Thoughts: Here's my analysis of the situation: Investigating the Configuration for a Specific Netlink Implementation Okay, so I'm digging into this `rust/kernel/net/netlink.rs` file, which I know is nestled within the `kernel` crate, specifically under `rust/kernel/net/mod.rs`. My goal is to understand how this code is compiled and under what configurations. To get the full picture, I need to check a few things. First, I need to determine precisely which configurations lead to the compilation of `rust/kernel/net/netlink.rs`. I'll start by checking the relevant Makefiles. I'll need to scrutinize `rust/Makefile`, `rust/kernel/Makefile`, and `rust/kernel/net/mod.rs` to find the compilation logic. These should contain the conditional compilation directives or build targets that control the inclusion of this particular file. I expect to find some conditional logic related to feature flags, architecture targets, or kernel configuration options. Let's dig in.
28/2	2026/09/27 07:58	tool	read-file	0m Args: { "File": "rust/kernel/net/mod.rs", "FirstLine": 1, "LineCount": 20 } Results: { "Contents": " 1:\t// SPDX-License-Identifier: GPL-2.0\n 2:\t\n 3:\t//! Networking.\n 4:\t\n 5:\t#[cfg(CONFIG_RUST_PHYLIB_ABSTRACTIONS)]\n 6:\tpub mod phy;\n 7:\t\n 8:\tpub mod netlink;\n" }
29/2	2026/09/27 07:58	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 28965 output: 26 thoughts: 73 Thoughts: Here's my summary, as I delve into this Rust kernel code: Navigating the Network Subsystem Alright, let's dive in. My immediate focus is on the network-related aspects, specifically within the Rust kernel code. I'm starting by examining `rust/kernel/net/mod.rs`. Ah, I see `pub mod netlink;` – this is a good starting point. Crucially, the presence of `netlink` seems unconditional, provided the `net` feature is compiled into the build. Now, I need to confirm if this `rust/kernel/net/mod.rs` file is itself conditionally included in the kernel's overall build. I'll need to check the main library file, `rust/kernel/lib.rs`. That's where I should find the conditional inclusion logic, if there is any. My goal here is to establish the build-time dependencies and conditional compilation paths.
30/2	2026/09/27 07:58	tool	grepper	0m Args: { "Expression": "mod net;", "PathPrefix": "rust/kernel" } Results: { "Output": "rust/kernel/lib.rs-105-#[cfg(CONFIG_NET)]\nrust/kernel/lib.rs:106:pub mod net;\nrust/kernel/lib.rs-107-pub mod num;\n" }
31/2	2026/09/27 07:58	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 29330 output: 23 thoughts: 562 Thoughts: Analyzing the Netlink Implementation Okay, so I'm looking at the kernel crate's netlink module, specifically the `rust/kernel/lib.rs` file. I see the `net` module is conditionally compiled, based on `CONFIG_NET`. That means if both `CONFIG_RUST` and `CONFIG_NET` are enabled, then the netlink code is included. Makes sense. Now, I want to trace how `GenlMsg::put` is used. I'm focusing on that `put` method, the core function that's being called internally. So I dive into `netlink.rs` to understand the netlink message structure. I notice the `GenlMsg::put` method. It's an internal helper function. It's marked as `private` which is important to notice. It handles putting attributes into the netlink message. I see the safety comments, which is good. Important to note the size check in there. Looking at the code, `put` itself is used internally. It's the building block for adding attributes into the message. I can see that `put_u32` and `put_string` both use it. They are the public functions that the user would use. The next question: are these the only callers of `.put`? Or are there any other calls to it from outside this file? I need to check the entire kernel to be sure I've identified all of the calling contexts. A `grep` might be helpful to search for `.put(` or `put_` or even `GenlMsg`. I can quickly scan the source to identify all the uses of this function in the kernel codebase.
32/2	2026/09/27 07:58	tool	grepper	0m Args: { "Expression": "\\bput_u32\\b" } Results: { "Output": "drivers/android/binder/netlink.rs=57= pub fn error(\u0026mut self, val: u32) -\u003e Result {\ndrivers/android/binder/netlink.rs-58- const BINDER_A_REPORT_ERROR: c_int = kernel::uapi::BINDER_A_REPORT_ERROR as c_int;\ndrivers/android/binder/netlink.rs:59: self.skb.put_u32(BINDER_A_REPORT_ERROR, val)\ndrivers/android/binder/netlink.rs-60- }\n--\ndrivers/android/binder/netlink.rs=69= pub fn from_pid(\u0026mut self, val: u32) -\u003e Result {\ndrivers/android/binder/netlink.rs-70- const BINDER_A_REPORT_FROM_PID: c_int = kernel::uapi::BINDER_A_REPORT_FROM_PID as c_int;\ndrivers/android/binder/netlink.rs:71: self.skb.put_u32(BINDER_A_REPORT_FROM_PID, val)\ndrivers/android/binder/netlink.rs-72- }\n--\ndrivers/android/binder/netlink.rs=75= pub fn from_tid(\u0026mut self, val: u32) -\u003e Result {\ndrivers/android/binder/netlink.rs-76- const BINDER_A_REPORT_FROM_TID: c_int = kernel::uapi::BINDER_A_REPORT_FROM_TID as c_int;\ndrivers/android/binder/netlink.rs:77: self.skb.put_u32(BINDER_A_REPORT_FROM_TID, val)\ndrivers/android/binder/netlink.rs-78- }\n--\ndrivers/android/binder/netlink.rs=82= pub fn to_pid(\u0026mut self, val: u32) -\u003e Result {\ndrivers/android/binder/netlink.rs-83- const BINDER_A_REPORT_TO_PID: c_int = kernel::uapi::BINDER_A_REPORT_TO_PID as c_int;\ndrivers/android/binder/netlink.rs:84: self.skb.put_u32(BINDER_A_REPORT_TO_PID, val)\ndrivers/android/binder/netlink.rs-85- }\n--\ndrivers/android/binder/netlink.rs=89= pub fn to_tid(\u0026mut self, val: u32) -\u003e Result {\ndrivers/android/binder/netlink.rs-90- const BINDER_A_REPORT_TO_TID: c_int = kernel::uapi::BINDER_A_REPORT_TO_TID as c_int;\ndrivers/android/binder/netlink.rs:91: self.skb.put_u32(BINDER_A_REPORT_TO_TID, val)\ndrivers/android/binder/netlink.rs-92- }\n--\ndrivers/android/binder/netlink.rs=101= pub fn flags(\u0026mut self, val: u32) -\u003e Result {\ndrivers/android/binder/netlink.rs-102- const BINDER_A_REPORT_FLAGS: c_int = kernel::uapi::BINDER_A_REPORT_FLAGS as c_int;\ndrivers/android/binder/netlink.rs:103: self.skb.put_u32(BINDER_A_REPORT_FLAGS, val)\ndrivers/android/binder/netlink.rs-104- }\n--\ndrivers/android/binder/netlink.rs=107= pub fn code(\u0026mut self, val: u32) -\u003e Result {\ndrivers/android/binder/netlink.rs-108- const BINDER_A_REPORT_CODE: c_int = kernel::uapi::BINDER_A_REPORT_CODE as c_int;\ndrivers/android/binder/netlink.rs:109: self.skb.put_u32(BINDER_A_REPORT_CODE, val)\ndrivers/android/binder/netlink.rs-110- }\n--\ndrivers/android/binder/netlink.rs=113= pub fn data_size(\u0026mut self, val: u32) -\u003e Result {\ndrivers/android/binder/netlink.rs-114- const BINDER_A_REPORT_DATA_SIZE: c_int = kernel::uapi::BINDER_A_REPORT_DATA_SIZE as c_int;\ndrivers/android/binder/netlink.rs:115: self.skb.put_u32(BINDER_A_REPORT_DATA_SIZE, val)\ndrivers/android/binder/netlink.rs-116- }\n--\nrust/kernel/net/netlink.rs=86= fn put\u003cT\u003e(\u0026mut self, attrtype: c_int, value: \u0026T) -\u003e Result\n--\nrust/kernel/net/netlink.rs-107- #[inline]\nrust/kernel/net/netlink.rs:108: pub fn put_u32(\u0026mut self, attrtype: c_int, value: u32) -\u003e Result {\nrust/kernel/net/netlink.rs-109- self.put(attrtype, \u0026value)\n" }
33/2	2026/09/27 07:58	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 31572 output: 21 thoughts: 6 Thoughts: Okay, I'm ready. Here's a summary as if I'm processing the "Thoughts" provided, tailored for an expert audience. * My Analytical Breakdown of the 'put_string' Function** Alright, let's dissect this `put_string` function. My initial thought process immediately gravitates towards its purpose: outputting a string to a given context. I'm already formulating questions: Is this a low-level, system call-wrapped function, or is it a higher-level abstraction layered on top of other output mechanisms? The context I'm envisioning is crucial – is it standard output (stdout), a file descriptor, a network socket, or perhaps something more esoteric like a memory-mapped region? The parameters are what I'm focusing on now. I’m thinking about their types and what considerations I need to make. A standard `char*` would seem logical as input, but what about its encoding? ASCII, UTF-8, or something else entirely? Error handling is the next thing I'm turning my mind towards: what happens if the context is invalid, if there's a write error, or if we run out of space? Is the function expected to return a status code, throw an exception, or silently fail? And what about string length? Will this function be expecting a null-terminated string, or does it also accept a separate length parameter? That detail significantly impacts the implementation's efficiency and potential vulnerability to buffer overflows. I'm now considering performance. Is this a blocking or non-blocking operation? If it's the former, it might be a bottleneck, and I'd need to assess its impact on the calling code's responsiveness. If it's non-blocking, how does it handle partial writes or asynchronous completion? I’m thinking about how it’s going to be integrated into larger systems. If it’s frequently called within a critical path, then even seemingly minor overhead will have a cumulative effect. I'm now contemplating memory management. Does this function take ownership of the string, or does it expect the caller to manage its lifetime? A shared ownership model might introduce thread-safety complications. Finally, I'm mentally tracing through potential implementations. I see some options: a direct call to a `write` system call, wrapping a buffered I/O library function, or even something custom optimized for a specific hardware platform. My mind is now turning to potential edge cases: handling of very long strings, handling of null strings, interaction with other concurrent threads writing to the same context, and alignment of the output. I need to know about all these things.
34/2	2026/09/27 07:58	tool	grepper	0m Args: { "Expression": "\\bput_string\\b" } Results: { "Output": "drivers/android/binder/netlink.rs=63= pub fn context(\u0026mut self, val: \u0026CStr) -\u003e Result {\ndrivers/android/binder/netlink.rs-64- const BINDER_A_REPORT_CONTEXT: c_int = kernel::uapi::BINDER_A_REPORT_CONTEXT as c_int;\ndrivers/android/binder/netlink.rs:65: self.skb.put_string(BINDER_A_REPORT_CONTEXT, val)\ndrivers/android/binder/netlink.rs-66- }\n--\nrust/kernel/net/netlink.rs=108= pub fn put_u32(\u0026mut self, attrtype: c_int, value: u32) -\u003e Result {\n--\nrust/kernel/net/netlink.rs-113- #[inline]\nrust/kernel/net/netlink.rs:114: pub fn put_string(\u0026mut self, attrtype: c_int, value: \u0026CStr) -\u003e Result {\nrust/kernel/net/netlink.rs-115- self.put(attrtype, value.to_bytes_with_nul())\n" }
35/2	2026/09/27 07:58	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 32437 output: 29 thoughts: 55 Thoughts: Okay, let's dive into this. Here's how I'm thinking about it: Tracing the Source of Binder Netlink Reporting Alright, time to get to the root of the issue. I need to understand where the `report_netlink_inner` function or the `Report::new` constructor, as used within `drivers/android/binder/transaction.rs`, are being called. That's the key to understanding the data flow here. My approach? A good old `grep` search. I'm going to focus the search within the `drivers/android/binder/` directory to keep it focused and efficient. The goal is to identify all instances of `report_netlink` (or anything that looks like it) being called. This will give me a clear picture of how these reporting functions are being used within the Binder framework.
36/2	2026/09/27 07:58	tool	grepper	0m Args: { "Expression": "report_netlink", "PathPrefix": "drivers/android/binder" } Results: { "Output": "drivers/android/binder/thread.rs=1284= fn transaction(self: \u0026Arc\u003cSelf\u003e, cmd: u32, reader: \u0026mut UserSliceReader) -\u003e Result\u003c()\u003e {\n--\ndrivers/android/binder/thread.rs-1334- // useful in case the transaction failed with BR_TRANSACTION_PENDING_FROZEN.\ndrivers/android/binder/thread.rs:1335: info.report_netlink(BR_ONEWAY_SPAM_SUSPECT, \u0026self.process.ctx);\ndrivers/android/binder/thread.rs-1336- }\ndrivers/android/binder/thread.rs-1337- if info.reply != 0 {\ndrivers/android/binder/thread.rs:1338: info.report_netlink(info.reply, \u0026self.process.ctx);\ndrivers/android/binder/thread.rs-1339- }\n--\ndrivers/android/binder/transaction.rs=80= pub(crate) fn is_oneway(\u0026self) -\u003e bool {\n--\ndrivers/android/binder/transaction.rs-83-\ndrivers/android/binder/transaction.rs:84: pub(crate) fn report_netlink(\u0026self, reply: u32, ctx: \u0026crate::Context) {\ndrivers/android/binder/transaction.rs:85: if let Err(err) = self.report_netlink_inner(reply, ctx) {\ndrivers/android/binder/transaction.rs-86- pr_warn!(\n--\ndrivers/android/binder/transaction.rs-93-\ndrivers/android/binder/transaction.rs:94: fn report_netlink_inner(\u0026self, reply: u32, ctx: \u0026crate::Context) -\u003e kernel::error::Result {\ndrivers/android/binder/transaction.rs-95- if !Report::has_listeners() {\n" }
37/2	2026/09/27 07:58	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 33165 output: 20 thoughts: 558 Thoughts: Binder Netlink Error Reporting - Digging into the Implementation Okay, so I'm looking at this code, and it's pretty clever. When `CONFIG_ANDROID_BINDER_IPC_RUST` is enabled, Binder transactions are now reporting errors and status updates using generic netlink. My first thought is, "That's a good approach!" This seems like a reasonable way to expose these sorts of errors. Now, I'm trying to wrap my head around the specifics. Can a userspace process just arbitrarily create a netlink listener on the `BINDER` family? It looks like `Report::has_listeners()` checks `BINDER_NL_FAMILY.has_listeners(0)`. That's the gate. Okay, got it. Then, when an error occurs during a Binder transaction, or when there's an issue with one-way calls, the `info.report_netlink(...)` function is called. In the `report_netlink_inner` function, the `report.context(&ctx.name)` calls `put_string`, and `report.error`, etc. call `put_u32`. This looks like a standard pattern to encode the error information. I'm now thinking about the structure. I'm trying to anticipate potential issues. I'm wondering what the maximum length (`len`) of these fields could be. In `put_u32`, `len` is definitely just 4 bytes, which is what I'd expect. But in `put_string`, the `len` is calculated as `val.to_bytes_with_nul().len()`. That's where it could get tricky. I need to confirm if `val` can ever exceed the `MAX_PAYLOAD_LEN`. I'm starting to think about potential buffer overflows. I'm also now thinking that maybe this check was added to address a specific issue. Okay, so then there is `rust/kernel/net/netlink.rs` which clearly looks like an abstraction for Netlink in the Rust kernel support. The comment confirms this! "Rust support for generic netlink." I need to know why that check for potential length issues was added. The most likely source of the answer lies in the commit history or the commit message for commit `ef8d6ba44859a1048a43b1823c1f1db063eda625` or previous commits. I don't have a direct tool to view `git log`, though I'd normally use something like `grepper` or `git log`. Given that I don't have access to a tool, I'll need to examine the code carefully. I'll check what was happening before the patch. Before the patch, the code was like this: ```rust let skb = self.skb.skb.as_ptr(); let len = size_of_val(value); let ptr = core::ptr::from_ref(value).cast::<c_void>(); // SAFETY: `skb` is valid by `NetlinkSkBuff` type invariants, and the provided value is // readable and initialized for its `size_of` bytes. to_result(unsafe { bindings::nla_put(skb, attrtype, len as c_int, ptr) }) ``` The key piece is `bindings::nla_put`. I should go look at what this `nla_put` function does in C. It's time to dig into the C code.
38/2	2026/09/27 07:58	tool	grepper	0m Args: { "Expression": "int nla_put\\(" } Results: { "Output": "include/net/netlink.h=566=void __nla_put_nohdr(struct sk_buff skb, int attrlen, const void data);\ninclude/net/netlink.h:567:int nla_put(struct sk_buff skb, int attrtype, int attrlen, const void data);\ninclude/net/netlink.h-568-int nla_put_64bit(struct sk_buff skb, int attrtype, int attrlen,\n--\nlib/nlattr.c=1082=EXPORT_SYMBOL(__nla_put_nohdr);\n--\nlib/nlattr.c-1093- /\nlib/nlattr.c:1094:int nla_put(struct sk_buff skb, int attrtype, int attrlen, const void data)\nlib/nlattr.c-1095-{\n" }
39/2	2026/09/27 07:58	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 34745 output: 35 thoughts: 20 Thoughts: Okay, let's dive into this. Here's my thought process on the matter: Analyzing `lib/nlattr.c` Around Line 1094 Alright, I'm thinking we need to go directly to `lib/nlattr.c` around line 1094. I'm assuming that this specific line or the code block around it is likely the key area of interest. I'm going to look for something specific: perhaps a potential bug, an area for optimization, or maybe just something related to the current problem that I'm trying to solve. Knowing the usual structure of this codebase, I will now use my understanding of the relevant protocols and data structures to understand this specific section of code. I'll be focused and look for any clues that could shed light on the matter.
40/2	2026/09/27 07:59	tool	read-file	0m Args: { "File": "lib/nlattr.c", "FirstLine": 1090, "LineCount": 25 } Results: { "Contents": "1090:\t \n1091:\t Returns -EMSGSIZE if the tailroom of the skb is insufficient to store\n1092:\t * the attribute header and payload.\n1093:\t /\n1094:\tint nla_put(struct sk_buff skb, int attrtype, int attrlen, const void data)\n1095:\t{\n1096:\t\tif (unlikely(skb_tailroom(skb) \u003c nla_total_size(attrlen)))\n1097:\t\t\treturn -EMSGSIZE;\n1098:\t\n1099:\t\t__nla_put(skb, attrtype, attrlen, data);\n1100:\t\treturn 0;\n1101:\t}\n1102:\tEXPORT_SYMBOL(nla_put);\n1103:\t\n1104:\t/\n1105:\t nla_put_64bit - Add a netlink attribute to a socket buffer and align it\n1106:\t * @skb: socket buffer to add attribute to\n1107:\t * @attrtype: attribute type\n1108:\t * @attrlen: length of attribute payload\n1109:\t * @data: head of attribute payload\n1110:\t * @padattr: attribute type for the padding\n1111:\t \n1112:\t Returns -EMSGSIZE if the tailroom of the skb is insufficient to store\n1113:\t * the attribute header and payload.\n1114:\t */\n" }
41/2	2026/09/27 07:59	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 35374 output: 21 thoughts: 31 Thoughts: Okay, here's my interpretation of those thoughts, crafted with the understanding that I'm talking to a fellow expert: Navigating the Netlink Landscape Alright, my immediate thought is to zero in on how the `__nla_put` function fits into the Netlink puzzle. The notation directs me straight to its implementation – `lib/nlattr.c` – and then to the `net/netlink.h` header file. This suggests I need to grasp the core mechanics of Netlink attributes. I'm thinking, this function likely plays a key role in constructing the payload of Netlink messages. It's probably responsible for formatting and serializing data into those Network Link Attributes, or NLAs, that form the building blocks of communication within the Netlink framework. I want to understand exactly how it handles attribute length, type, and value encoding. The header likely defines the structures and macros `__nla_put` relies on for its operation. I'll need to refresh my understanding of the data structures in the include files to follow the flow of information.
42/2	2026/09/27 07:59	tool	grepper	0m Args: { "Expression": "void __nla_put\\(" } Results: { "Output": "include/net/netlink.h=561=void nla_reserve_nohdr(struct sk_buff skb, int attrlen);\ninclude/net/netlink.h:562:void __nla_put(struct sk_buff skb, int attrtype, int attrlen,\ninclude/net/netlink.h-563-\t const void data);\n--\nlib/nlattr.c=1023=EXPORT_SYMBOL(nla_reserve_nohdr);\n--\nlib/nlattr.c-1034- /\nlib/nlattr.c:1035:void __nla_put(struct sk_buff skb, int attrtype, int attrlen,\nlib/nlattr.c-1036-\t\t\t const void *data)\n" }
43/2	2026/09/27 07:59	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 35857 output: 35 thoughts: 19 Thoughts: Okay, let's dive into this. I'm going to take a look at the `lib/nlattr.c` file, specifically around line 1035. I know this code pretty well, so I'm expecting to find something specific there. Knowing the surrounding context will be key to understanding the specific function or code block I am looking for. I am confident that I can quickly pinpoint the relevant section and grasp the function's purpose. I am ready to begin.
44/2	2026/09/27 07:59	tool	read-file	0m Args: { "File": "lib/nlattr.c", "FirstLine": 1030, "LineCount": 40 } Results: { "Contents": "1030:\t * @data: head of attribute payload\n1031:\t \n1032:\t The caller is responsible to ensure that the skb provides enough\n1033:\t * tailroom for the attribute header and payload.\n1034:\t /\n1035:\tvoid __nla_put(struct sk_buff skb, int attrtype, int attrlen,\n1036:\t\t\t\t const void data)\n1037:\t{\n1038:\t\tstruct nlattr nla;\n1039:\t\n1040:\t\tnla = __nla_reserve(skb, attrtype, attrlen);\n1041:\t\tmemcpy(nla_data(nla), data, attrlen);\n1042:\t}\n1043:\tEXPORT_SYMBOL(__nla_put);\n1044:\t\n1045:\t/*\n1046:\t __nla_put_64bit - Add a netlink attribute to a socket buffer and align it\n1047:\t * @skb: socket buffer to add attribute to\n1048:\t * @attrtype: attribute type\n1049:\t * @attrlen: length of attribute payload\n1050:\t * @data: head of attribute payload\n1051:\t * @padattr: attribute type for the padding\n1052:\t \n1053:\t The caller is responsible to ensure that the skb provides enough\n1054:\t * tailroom for the attribute header and payload.\n1055:\t /\n1056:\tvoid __nla_put_64bit(struct sk_buff skb, int attrtype, int attrlen,\n1057:\t\t\t const void data, int padattr)\n1058:\t{\n1059:\t\tstruct nlattr nla;\n1060:\t\n1061:\t\tnla = __nla_reserve_64bit(skb, attrtype, attrlen, padattr);\n1062:\t\tmemcpy(nla_data(nla), data, attrlen);\n1063:\t}\n1064:\tEXPORT_SYMBOL(__nla_put_64bit);\n1065:\t\n1066:\t/*\n1067:\t __nla_put_nohdr - Add a netlink attribute without header\n1068:\t * @skb: socket buffer to add attribute to\n1069:\t * @attrlen: length of attribute payload\n" }
45/2	2026/09/27 07:59	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 36650 output: 24 thoughts: 13 Thoughts: Okay, here's my interpretation of "And let's look at `__nla_reserve`," presented as a first-person expert summary: Diving into `__nla_reserve` Right, let's zero in on this `__nla_reserve` function. The fact that we're explicitly calling it suggests it's a critical piece of the Netlink attribute (NLA) handling puzzle. Given my expertise, I immediately start running through its potential roles in my head. Is this related to pre-allocating space within the Netlink message for NLAs? Is it a sanity check, ensuring sufficient buffer capacity before we even attempt to write attributes? Does it manage alignment concerns within the message? Perhaps it helps with determining the size of the required buffer? I'm thinking about typical Netlink operations; creating, reading, and updating. I need to understand what this does in each of those contexts. It could be for optimization, preventing unnecessary reallocations during NLA construction. Or is it more of a safety measure, designed to fail fast if we're exceeding the size limits imposed by the transport layer or some defined policy? I'm picturing the `nlattr` struct, the padding requirements, and how this function likely plays a role in correctly managing those elements. It's time to get down to the details of its implementation to solidify my intuition and understanding. Let’s look at the source.
46/2	2026/09/27 07:59	tool	grepper	0m Args: { "Expression": "struct nlattr \\__nla_reserve\\(" } Results:* { "Output": "include/net/netlink.h=553=int nla_strcmp(const struct nlattr nla, const char str);\ninclude/net/netlink.h:554:struct nlattr __nla_reserve(struct sk_buff skb, int attrtype, int attrlen);\ninclude/net/netlink.h-555-struct nlattr __nla_reserve_64bit(struct sk_buff skb, int attrtype,\n--\nlib/nlattr.c=887=EXPORT_SYMBOL(nla_strcmp);\n--\nlib/nlattr.c-901- /\nlib/nlattr.c:902:struct nlattr __nla_reserve(struct sk_buff *skb, int attrtype, int attrlen)\nlib/nlattr.c-903-{\n" }
47/2	2026/09/27 07:59	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 37202 output: 34 thoughts: 18 Thoughts: Here's my analysis of the provided text, rendered as a first-person expert summary: Diving into `lib/nlattr.c` at Line 902 Okay, let's zero in on `lib/nlattr.c` and specifically, let's head over to the code around line 902. That area usually holds crucial network link attribute (nlattr) handling logic. I'm expecting to find something interesting there related to either attribute parsing, validation, or perhaps even manipulation based on some specific requirement. I'm thinking about performance implications and possible security vulnerabilities, especially when dealing with data provided from untrusted sources in those network attribute structures. I know I have to be careful with the lengths and types to prevent buffer overflows or type confusion. Let's see what's actually going on. My focus is on understanding the implementation in detail, and considering whether this section would need to be revisited in order to perform some change, perhaps.
48/2	2026/09/27 07:59	tool	read-file	0m Args: { "File": "lib/nlattr.c", "FirstLine": 900, "LineCount": 20 } Results: { "Contents": " 900:\t * tailroom for the attribute header and payload.\n 901:\t /\n 902:\tstruct nlattr __nla_reserve(struct sk_buff skb, int attrtype, int attrlen)\n 903:\t{\n 904:\t\tstruct nlattr nla;\n 905:\t\n 906:\t\tnla = skb_put(skb, nla_total_size(attrlen));\n 907:\t\tnla-\u003enla_type = attrtype;\n 908:\t\tnla-\u003enla_len = nla_attr_size(attrlen);\n 909:\t\n 910:\t\tmemset((unsigned char ) nla + nla-\u003enla_len, 0, nla_padlen(attrlen));\n 911:\t\n 912:\t\treturn nla;\n 913:\t}\n 914:\tEXPORT_SYMBOL(__nla_reserve);\n 915:\t\n 916:\t/\n 917:\t __nla_reserve_64bit - reserve room for attribute on the skb and align it\n 918:\t * @skb: socket buffer to reserve room on\n 919:\t * @attrtype: attribute type\n" }
49/2	2026/09/27 07:59	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 37790 output: 28 thoughts: 659 Thoughts: Analyzing Potential Integer Overflow in Netlink Attribute Length Okay, so I'm looking at this code and immediately see a potential issue with netlink attribute length calculation. The line `nla->nla_len = nla_attr_size(attrlen);` is setting the length, and `nla->nla_len` is a `__u16`, which is a 16-bit unsigned integer. The problem is obvious: if `attrlen` is too large, or if the calculation with `nla_attr_size(attrlen)` results in a value greater than 65535, then we have an integer overflow on our hands! My immediate thought is: this could be a security vulnerability if we aren't careful. A crafted `attrlen` could lead to an incorrect length being written, potentially causing buffer overflows or other memory corruption. Now, the Rust code in `rust/kernel/net/netlink.rs` seems to be trying to address this. They've defined `MAX_PAYLOAD_LEN` as `u16::MAX - size_of::<bindings::nlattr>()` which, as an expert in this area, I can see is the correct way to calculate the maximum payload size within a 16-bit field. The code then checks if the length of the data (`len`) exceeds `MAX_PAYLOAD_LEN`. If it does, it returns an error. It looks like they are trying to prevent this overflow with this size check. But... can this check actually happen? Is it reachable in practice? This is what I need to investigate now. I need to determine if we can actually trigger an `attrlen` value large enough to cause this check to fail. Is this a dead code path? A quick search reveals a couple of `put_` methods being called within a netlink message: `put_u32` and `put_string`. I know that a `u32` value (size 4 bytes) is never going to cause a problem. The `put_string` method is more interesting. It's used to add a C string to the netlink message. My instinct tells me that this is where a large length could* become a problem. Let's see where that's used. Ah, it is used by a `context` function. Let me see where that's called. Looks like a `report.context()` is called, and that `report` is used by the `binder` driver. Let's dig deeper into the `ctx.name` variable: is this something we can control? Does the length of `ctx.name` come from user input? If so, this could be the vector we need!
50/2	2026/09/27 07:59	tool	grepper	0m Args: { "Expression": "ctx\\.name", "PathPrefix": "drivers/android/binder" } Results: { "Output": "drivers/android/binder/process.rs=551= pub(crate) fn debug_print_stats(\u0026self, m: \u0026SeqFile, ctx: \u0026Context) -\u003e Result\u003c()\u003e {\ndrivers/android/binder/process.rs-552- seq_print!(m, \"proc {}\\n\", self.pid_in_current_ns());\ndrivers/android/binder/process.rs:553: seq_print!(m, \"context {}\\n\", \u0026ctx.name);\ndrivers/android/binder/process.rs-554-\n--\ndrivers/android/binder/process.rs=599= pub(crate) fn debug_print(\u0026self, m: \u0026SeqFile, ctx: \u0026Context, print_all: bool) -\u003e Result\u003c()\u003e {\ndrivers/android/binder/process.rs-600- seq_print!(m, \"proc {}\\n\", self.pid_in_current_ns());\ndrivers/android/binder/process.rs:601: seq_print!(m, \"context {}\\n\", \u0026ctx.name);\ndrivers/android/binder/process.rs-602-\n--\ndrivers/android/binder/transaction.rs=94= fn report_netlink_inner(\u0026self, reply: u32, ctx: \u0026crate::Context) -\u003e kernel::error::Result {\n--\ndrivers/android/binder/transaction.rs-100- report.error(reply)?;\ndrivers/android/binder/transaction.rs:101: report.context(\u0026ctx.name)?;\ndrivers/android/binder/transaction.rs-102- report.from_pid(self.from_pid as u32)?;\n" }
51/2	2026/09/27 07:59	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 39473 output: 29 thoughts: 21 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: Tracing Context Initialization Alright, my first instinct is to get a handle on the `Context` object, specifically how and where it's being spun up. I need to pinpoint the creation or initialization points of this `Context` variable. Understanding its origin is key to understanding its lifecycle. My next step is to examine what value is assigned to the `ctx.name` attribute. That's a crucial piece of metadata that likely tells me a lot about what the context represents, how it's intended to be used, and its role in the overall architecture. I suspect it holds a descriptive string, potentially a key for lookup in a configuration map. Knowing the exact content of `ctx.name` is my primary goal, as it will tell a lot about the intention of the code.
52/2	2026/09/27 07:59	tool	grepper	0m Args: { "Expression": "struct Context\\b", "PathPrefix": "drivers/android/binder" } Results: { "Output": "drivers/android/binder/context.rs=39=struct Manager {\n--\ndrivers/android/binder/context.rs-46-#[pin_data]\ndrivers/android/binder/context.rs:47:pub(crate) struct Context {\ndrivers/android/binder/context.rs-48- #[pin]\n" }
53/2	2026/09/27 07:59	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 39794 output: 36 thoughts: 15 Thoughts: Okay, let's dive into `drivers/android/binder/context.rs`. I need to understand how the Binder context is handled at the driver level in this Android environment. I'm expecting to see the core mechanisms for managing Binder objects, their lifetimes, and the interaction with the Binder kernel driver. Given my expertise, I'm particularly interested in how they've handled the complexities of multithreaded access, potential race conditions, and any optimizations they've implemented. I'll be looking for the fundamental data structures used to track clients, servers, transactions, and object references. Specifically, I'm expecting to find aspects that are interesting and innovative, or problematic and could cause issues down the line. I'll also pay close attention to the error handling strategies and how they ensure the integrity of the Binder system. I'll start by tracing the code through from top to bottom, making a note of any unusual design decisions.
54/2	2026/09/27 07:59	tool	read-file	0m Args: { "File": "drivers/android/binder/context.rs", "FirstLine": 40, "LineCount": 50 } Results: { "Contents": " 40:\t node: Option\u003cNodeRef\u003e,\n 41:\t uid: Option\u003cKuid\u003e,\n 42:\t all_procs: KVVec\u003cArc\u003cProcess\u003e\u003e,\n 43:\t}\n 44:\t\n 45:\t/// There is one context per binder file (/dev/binder, /dev/hwbinder, etc)\n 46:\t#[pin_data]\n 47:\tpub(crate) struct Context {\n 48:\t #[pin]\n 49:\t manager: Mutex\u003cManager\u003e,\n 50:\t pub(crate) name: CString,\n 51:\t}\n 52:\t\n 53:\timpl Context {\n 54:\t pub(crate) fn new(name: \u0026CStr) -\u003e Result\u003cArc\u003cSelf\u003e\u003e {\n 55:\t let name = CString::try_from(name)?;\n 56:\t let ctx = Arc::pin_init(\n 57:\t try_pin_init!(Context {\n 58:\t name,\n 59:\t manager \u003c- kernel::new_mutex!(Manager {\n 60:\t all_procs: KVVec::new(),\n 61:\t node: None,\n 62:\t uid: None,\n 63:\t }, \"Context::manager\"),\n 64:\t }),\n 65:\t GFP_KERNEL,\n 66:\t )?;\n 67:\t\n 68:\t CONTEXTS.lock().contexts.push(ctx.clone(), GFP_KERNEL)?;\n 69:\t\n 70:\t Ok(ctx)\n 71:\t }\n 72:\t\n 73:\t /// Called when the file for this context is unlinked.\n 74:\t ///\n 75:\t /// No-op if called twice.\n 76:\t pub(crate) fn deregister(self: \u0026Arc\u003cSelf\u003e) {\n 77:\t // Safe removal using retain\n 78:\t CONTEXTS.lock().contexts.retain(\|c\| !Arc::ptr_eq(c, self));\n 79:\t }\n 80:\t\n 81:\t pub(crate) fn register_process(self: \u0026Arc\u003cSelf\u003e, proc: Arc\u003cProcess\u003e) -\u003e Result {\n 82:\t if !Arc::ptr_eq(self, \u0026proc.ctx) {\n 83:\t pr_err!(\"Context::register_process called on the wrong context.\");\n 84:\t return Err(EINVAL);\n 85:\t }\n 86:\t self.manager.lock().all_procs.push(proc, GFP_KERNEL)?;\n 87:\t Ok(())\n 88:\t }\n 89:\t\n" }
55/2	2026/09/27 07:59	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 40737 output: 28 thoughts: 9 Thoughts: Here's my thought process, as requested: Tracing the Instantiation of `Context::new` Okay, so I need to figure out where the `Context::new` method is being invoked. My immediate thought is, "Right, I need to understand the call graph, or at least identify the direct callers." I'll need to use my usual tools here. I'll probably start with a grep or a similar search within the codebase, looking for direct mentions of that exact function name within the project directory. I could also use my IDE's "find usages" or "call hierarchy" feature if it's available and effective within this particular project structure. Once I have the locations, I can then start to analyze the surrounding code to determine which pieces of functionality are creating and using the `Context` object. This likely entails tracing execution flow, understanding data dependencies, and noting the parameters passed in. I'm going to want to know the scope. Is this a top level object or used within loops? Is it thread safe? Knowing the context of the call is key to determining its purpose. Is the `Context` object created once at program startup, or frequently throughout the application's lifecycle? That context will influence how I interpret the information.
56/2	2026/09/27 07:59	tool	grepper	0m Args: { "Expression": "Context::new", "PathPrefix": "drivers/android/binder" } Results: { "Output": "drivers/android/binder/rust_binder_main.rs=322=unsafe impl\u003cT\u003e Sync for AssertSync\u003cT\u003e {}\n--\ndrivers/android/binder/rust_binder_main.rs-349- let name = unsafe { kernel::str::CStr::from_char_ptr(name) };\ndrivers/android/binder/rust_binder_main.rs:350: match Context::new(name) {\ndrivers/android/binder/rust_binder_main.rs-351- Ok(ctx) =\u003e Arc::into_foreign(ctx),\n" }
57/2	2026/09/27 07:59	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 41183 output: 41 thoughts: 17 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience and presented in the first person: Navigating the Rust Binder Implementation Alright, so the clue leads me to `rust_binder_main.rs`. That's where I need to start digging to understand this particular facet of the Binder implementation in Rust. This likely holds the entry point or core initialization logic that's being described. I need to zero in on how this part of the code is handling the specifics of whatever interaction we're focusing on. What functions are being called? What data structures are involved? I need to build a mental map of the call stack from the main function of `rust_binder_main.rs` down to the actual interaction or behavior that's relevant.
58/2	2026/09/27 07:59	tool	read-file	0m Args: { "File": "drivers/android/binder/rust_binder_main.rs", "FirstLine": 340, "LineCount": 40 } Results: { "Contents": " 340:\t};\n 341:\t\n 342:\t/// # Safety\n 343:\t/// Only called by binderfs.\n 344:\t#[no_mangle]\n 345:\tunsafe extern \"C\" fn rust_binder_new_context(\n 346:\t name: const kernel::ffi::c_char,\n 347:\t) -\u003e mut kernel::ffi::c_void {\n 348:\t // SAFETY: The caller will always provide a valid c string here.\n 349:\t let name = unsafe { kernel::str::CStr::from_char_ptr(name) };\n 350:\t match Context::new(name) {\n 351:\t Ok(ctx) =\u003e Arc::into_foreign(ctx),\n 352:\t Err(_err) =\u003e core::ptr::null_mut(),\n 353:\t }\n 354:\t}\n 355:\t\n 356:\t/// # Safety\n 357:\t/// Only called by binderfs.\n 358:\t#[no_mangle]\n 359:\tunsafe extern \"C\" fn rust_binder_remove_context(device: mut kernel::ffi::c_void) {\n 360:\t if !device.is_null() {\n 361:\t // SAFETY: The caller ensures that the `device` pointer came from a previous call to\n 362:\t // `rust_binder_new_device`.\n 363:\t let ctx = unsafe { Arc::\u003cContext\u003e::from_foreign(device) };\n 364:\t ctx.deregister();\n 365:\t drop(ctx);\n 366:\t }\n 367:\t}\n 368:\t\n 369:\t/// # Safety\n 370:\t/// Only called by binderfs.\n 371:\tunsafe extern \"C\" fn rust_binder_open(\n 372:\t inode: mut bindings::inode,\n 373:\t file_ptr: mut bindings::file,\n 374:\t) -\u003e kernel::ffi::c_int {\n 375:\t // SAFETY: The `rust_binderfs.c` file ensures that `i_private` is set to a\n 376:\t // `struct binder_device`.\n 377:\t let device = unsafe { (inode).i_private } as *const binderfs::binder_device;\n 378:\t\n 379:\t assert!(!device.is_null());\n" }
59/2	2026/09/27 07:59	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 42059 output: 21 thoughts: 42 Thoughts: Okay, let's dive into this... Initial Observations on `rust_binder_new_context` Ah, there it is! I see that `rust_binder_new_context` is the key function called by binderfs whenever a new binder device comes online. That immediately piques my interest. It tells me that this is the entry point for initializing the binder context for a newly created device. Now, the next logical step is to understand the dependencies and interactions with this initialization function. Let's trace back from `rust_binder_new_context` and see what functions or code paths trigger its execution. I want to see how these devices are provisioned, and what the high-level calling context looks like.
60/2	2026/09/27 07:59	tool	grepper	0m Args: { "Expression": "rust_binder_new_context" } Results: { "Output": "drivers/android/binder/rust_binder_internal.h=49=extern const struct file_operations rust_binder_fops;\ndrivers/android/binder/rust_binder_internal.h:50:rust_binder_context rust_binder_new_context(char name);\ndrivers/android/binder/rust_binder_internal.h-51-void rust_binder_remove_context(rust_binder_context device);\n--\ndrivers/android/binder/rust_binder_main.rs=322=unsafe impl\u003cT\u003e Sync for AssertSync\u003cT\u003e {}\n--\ndrivers/android/binder/rust_binder_main.rs-344-#[no_mangle]\ndrivers/android/binder/rust_binder_main.rs:345:unsafe extern \"C\" fn rust_binder_new_context(\ndrivers/android/binder/rust_binder_main.rs-346- name: const kernel::ffi::c_char,\n--\ndrivers/android/binder/rust_binderfs.c=117=static int binderfs_binder_device_create(struct inode *ref_inode,\n--\ndrivers/android/binder/rust_binderfs.c-156-\ndrivers/android/binder/rust_binderfs.c:157:\tctx = rust_binder_new_context(req-\u003ename);\ndrivers/android/binder/rust_binderfs.c-158-\tif (!ctx)\n" }
61/2	2026/09/27 07:59	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 42626 output: 25 thoughts: 1316 Thoughts: Fuzzing Analysis of Binder Netlink Code Okay, let's break this down. I'm looking at this patch and immediately, my spider senses are tingling. Specifically, the new code in `rust/kernel/net/netlink.rs` and its interaction with binder is what's catching my eye. First, I see the code related to `binderfs_binder_device_create`. I know that userspace can create binder devices via `BINDER_CTL_ADD` ioctl. My immediate thought is, "What's the size limit on the `req->name`?" I know binderfs uses a `char name[BINDERFS_MAX_NAME + 1]` with `BINDERFS_MAX_NAME` typically set to 255. So, no 64KB shenanigans. That's a quick sanity check, but the real question is whether this new netlink code can be reached. I remember `rust/kernel/net/netlink.rs` is essentially our generic netlink abstraction for Rust kernel modules - essentially the glue between our Rust modules and the kernel's netlink subsystem. So it's not some obscure helper. It's a key part of our Rust integration. Time to re-read the triage guidelines to see if this is something we need to fuzz. First, the core philosophy is reachability, so if it's reachable it is to be fuzzed, regardless of if assertions are added. So, I need to figure out if this new netlink code is reachable. Looking at the negative criteria, does it fall into any of these categories? * Non-kernel and non-executable changes? Nope, it's kernel Rust code that is compiled into the kernel. * Structurally unreachable hardware? Nope. This is generic netlink and binder, so no specific hardware dependencies. * Unreachable execution paths? No teardown callbacks or architecture-specific code. So that means it potentially requires fuzzing. But is the new code reachable? Let's check: When `CONFIG_ANDROID_BINDER_IPC_RUST` is enabled: userspace opens `/dev/binder` (or binderfs), registers for netlink multicast notifications on the generic netlink family `BINDER_FAMILY_NAME` ("binder"), and performs binder transactions. When transactions error, `report_netlink_inner` executes: `report.context(...)` calls `self.skb.put_string(...)`, which calls `self.put(...)`. And `report.error(...)` calls `self.skb.put_u32(...)`, which calls `self.put(...)`. The new code in `self.put(...)` is executed directly on that path, including the check against `MAX_PAYLOAD_LEN`. Bingo! ```rust const MAX_PAYLOAD_LEN: usize = u16_as_usize(u16::MAX) - size_of::<bindings::nlattr>(); let skb = self.skb.skb.as_ptr(); let len = size_of_val(value); let ptr = core::ptr::from_ref(value).cast::<c_void>(); if len > MAX_PAYLOAD_LEN { return Err(EMSGSIZE); } ``` Now, let's see if there are other places where `rust/kernel/net/netlink.rs` is used. A quick grep shows it's used in `drivers/android/binder/netlink.rs` and `drivers/android/binder/transaction.rs` and also in `rust/kernel/net/mod.rs`. This confirms it's a core component. I should also check the samples to rule out future callers or samples, but for the moment, I have found a place where this code will be executed. That means this code needs fuzzing.
62/2	2026/09/27 07:59	tool	grepper	0m Error: no matches Args: { "Expression": "netlink", "PathPrefix": "samples/rust" } Results: { "error": "no matches" }
63/2	2026/09/27 07:59	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 44834 output: 17 thoughts: 20 Thoughts: Investigating Kernel Code for `GenlMsg` Mentions Okay, let's see. My primary focus is understanding the interaction of `GenlMsg` within the kernel's codebase. I need to get a clear picture of its usage and context. Therefore, my immediate task is to identify all instances where this term appears. I'll need a comprehensive search to ensure I don't miss anything, including related header files, source code, and perhaps even documentation or commit messages. This search will be the foundation for further analysis, helping me understand how `GenlMsg` is defined, used, and handled within the kernel's architecture. I'm looking for a complete picture, so a broad search is essential.
64/2	2026/09/27 07:59	tool	grepper	0m Args: { "Expression": "GenlMsg" } Results: { "Output": "drivers/android/binder/netlink.rs-7- Family,\ndrivers/android/binder/netlink.rs:8: GenlMsg,\ndrivers/android/binder/netlink.rs-9- MulticastGroup,\n--\ndrivers/android/binder/netlink.rs=28=pub struct Report {\ndrivers/android/binder/netlink.rs:29: skb: GenlMsg,\ndrivers/android/binder/netlink.rs-30-}\n--\nrust/kernel/net/netlink.rs=51= pub fn genlmsg_put(\n--\nrust/kernel/net/netlink.rs-56- cmd: u8,\nrust/kernel/net/netlink.rs:57: ) -\u003e Result\u003cGenlMsg, AllocError\u003e {\nrust/kernel/net/netlink.rs-58- let skb = self.skb.as_ptr();\n--\nrust/kernel/net/netlink.rs-61- let hdr = NonNull::new(hdr).ok_or(AllocError)?;\nrust/kernel/net/netlink.rs:62: Ok(GenlMsg { skb: self, hdr })\nrust/kernel/net/netlink.rs-63- }\n--\nrust/kernel/net/netlink.rs=67= fn drop(\u0026mut self) {\n--\nrust/kernel/net/netlink.rs-77-/// `hdr` references the header in this netlink message.\nrust/kernel/net/netlink.rs:78:pub struct GenlMsg {\nrust/kernel/net/netlink.rs-79- skb: NetlinkSkBuff,\n--\nrust/kernel/net/netlink.rs-82-\nrust/kernel/net/netlink.rs:83:impl GenlMsg {\nrust/kernel/net/netlink.rs-84- /// Puts an attribute into the message.\n--\nrust/kernel/net/netlink.rs=129= pub fn multicast(\n--\nrust/kernel/net/netlink.rs-150-}\nrust/kernel/net/netlink.rs:151:impl Drop for GenlMsg {\nrust/kernel/net/netlink.rs-152- fn drop(\u0026mut self) {\n--\ntools/net/ynl/pyynl/lib/ynl.py=461=def _genl_load_families():\n--\ntools/net/ynl/pyynl/lib/ynl.py-482-\ntools/net/ynl/pyynl/lib/ynl.py:483: gm = GenlMsg(nl_msg)\ntools/net/ynl/pyynl/lib/ynl.py-484- fam = {}\n--\ntools/net/ynl/pyynl/lib/ynl.py=509=def _genl_policy_dump(family_id, op):\n--\ntools/net/ynl/pyynl/lib/ynl.py-533-\ntools/net/ynl/pyynl/lib/ynl.py:534: gm = GenlMsg(nl_msg)\ntools/net/ynl/pyynl/lib/ynl.py-535- for attr in NlAttrs(gm.raw):\n--\ntools/net/ynl/pyynl/lib/ynl.py-553-\ntools/net/ynl/pyynl/lib/ynl.py:554:class GenlMsg:\ntools/net/ynl/pyynl/lib/ynl.py-555- def __init__(self, nl_msg):\n--\ntools/net/ynl/pyynl/lib/ynl.py=606=class GenlProtocol(NetlinkProtocol):\n--\ntools/net/ynl/pyynl/lib/ynl.py-623- def _decode(self, nl_msg):\ntools/net/ynl/pyynl/lib/ynl.py:624: return GenlMsg(nl_msg)\ntools/net/ynl/pyynl/lib/ynl.py-625-\n" }
65/2	2026/09/27 07:59	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 46053 output: 18 thoughts: 537 Thoughts: Analyzing Rust Symbol Mangling and Inlining in the Kernel Okay, let's dive into this. My initial thought is to figure out how the `GenlMsg::put` function and its callers are represented in the compiled kernel binary, specifically how their symbols are mangled. I need to understand this to debug and analyze what's going on. First, I see that the `GenlMsg::put` function is defined with `#[inline]` and is generic. Because of the `#[inline]` attribute and its generic nature (`put<T>`), this means `put<T>` will be monomorphized and inlined directly into the calling functions during compilation. This is important because it changes where the code actually ends up. So, I need to trace the callers to understand where the code is being used. I see that `put_u32` and `put_string` are also `#[inline]` functions that call `put`. This looks like a chain of inlining, where all are inline functions calling one another, and they are called from `Report::error`, `Report::context`, and other similar methods within `drivers/android/binder/netlink.rs`. Further, `report_netlink_inner` in `drivers/android/binder/transaction.rs` calls these `Report` functions, and `Transaction::report_netlink` in turn calls `report_netlink_inner`. The call stack goes even deeper. Then `Thread::transaction` in `drivers/android/binder/thread.rs` calls `report_netlink`. Now, I need to understand how Rust symbols are mangled within the Linux kernel context. In the Linux kernel Rust codebase, I need to remember, Rust symbols should follow v0 mangling, which starts with `_RNv...`. I need to quickly check whether tools like syzkaller, kallsyms, or `nm` will display Rust demangled or mangled names in the kernel output. I need to be able to identify these functions during debugging or analysis. I'll search the kernel repo and related test files and scripts for examples of how Rust symbols are formatted to understand what to expect.
66/2	2026/09/27 07:59	tool	grepper	0m Args: { "Expression": "report_netlink" } Results: { "Output": "drivers/android/binder/thread.rs=1284= fn transaction(self: \u0026Arc\u003cSelf\u003e, cmd: u32, reader: \u0026mut UserSliceReader) -\u003e Result\u003c()\u003e {\n--\ndrivers/android/binder/thread.rs-1334- // useful in case the transaction failed with BR_TRANSACTION_PENDING_FROZEN.\ndrivers/android/binder/thread.rs:1335: info.report_netlink(BR_ONEWAY_SPAM_SUSPECT, \u0026self.process.ctx);\ndrivers/android/binder/thread.rs-1336- }\ndrivers/android/binder/thread.rs-1337- if info.reply != 0 {\ndrivers/android/binder/thread.rs:1338: info.report_netlink(info.reply, \u0026self.process.ctx);\ndrivers/android/binder/thread.rs-1339- }\n--\ndrivers/android/binder/transaction.rs=80= pub(crate) fn is_oneway(\u0026self) -\u003e bool {\n--\ndrivers/android/binder/transaction.rs-83-\ndrivers/android/binder/transaction.rs:84: pub(crate) fn report_netlink(\u0026self, reply: u32, ctx: \u0026crate::Context) {\ndrivers/android/binder/transaction.rs:85: if let Err(err) = self.report_netlink_inner(reply, ctx) {\ndrivers/android/binder/transaction.rs-86- pr_warn!(\n--\ndrivers/android/binder/transaction.rs-93-\ndrivers/android/binder/transaction.rs:94: fn report_netlink_inner(\u0026self, reply: u32, ctx: \u0026crate::Context) -\u003e kernel::error::Result {\ndrivers/android/binder/transaction.rs-95- if !Report::has_listeners() {\n" }
67/2	2026/09/27 07:59	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 47530 output: 28 thoughts: 658 Thoughts: Analyzing Focus Symbols in Rust Kernel Code Okay, so I'm thinking about how to effectively extract FocusSymbols for Rust code within the Linux kernel, especially for fuzzing with something like syzkaller. The original guidelines focus on avoiding ubiquitous lifecycle functions, targeting specific feature logic, and handling static inline functions. But how does that translate to Rust? First thought, what are the actual symbol names in Rust? I need to check how Rust functions are named in the Linux kernel build. Then, I need to know if I can use something like `bindings::nla_put` as a FocusSymbol. Ah, but that's C code (`lib/nlattr.c`)! Is `nla_put` truly ubiquitous? A quick check reveals it's used extensively in netlink message generation, but it's in a `lib/` directory, which indicates it's likely more fundamental. Now, back to Rust! I'm pondering if `kernel::net::netlink::GenlMsg::put` or some demangled or mangled version of that could be a candidate. I remember FocusSymbols usually reflect function names as they appear in `/proc/kallsyms` or the symbol table, so what do I see there for Rust functions? The crucial point here is that the kernel build system preserves whatever symbol names the Rust compiler generates. In kernel 6.x, using `scripts/mksysmap` or `rustc` with `-C symbol-mangling-version=v0`, the object file symbol name might look something like `_RNvXs_Cs..._6kernel3net7netlink7GenlMsg3put`, or a similar name if not inlined. If it's demangled, it becomes `kernel::net::netlink::GenlMsg::put` or `<kernel::net::netlink::GenlMsg>::put`. Then, I'm thinking about whether syzkaller or `/proc/kallsyms` supports this kind of mangled name. I'm also wondering how this works with functions in `drivers/android/binder/`. I should verify what functions in that directory have `#[no_mangle]` or `extern "C"`, or if it even has normal Rust functions. Let's do a quick search for `#[no_mangle]` within that area. This seems like a reasonable approach to begin determining how Rust code is actually represented in the kernel's symbol space and identifying potentially useful FocusSymbols for testing.
68/2	2026/09/27 08:00	tool	grepper	0m Args: { "Expression": "no_mangle", "PathPrefix": "drivers/android/binder" } Results: { "Output": "drivers/android/binder/debug.rs=18= pub enum DebugMask {\n--\ndrivers/android/binder/debug.rs-36-\ndrivers/android/binder/debug.rs:37:#[no_mangle]\ndrivers/android/binder/debug.rs-38-pub(crate) static rust_binder_debug_mask: Atomic\u003cu32\u003e = Atomic::new(\n--\ndrivers/android/binder/page_range.rs=622= fn drop(self: Pin\u003c\u0026mut Self\u003e) {\n--\ndrivers/android/binder/page_range.rs-659-/// Called by the shrinker.\ndrivers/android/binder/page_range.rs:660:#[no_mangle]\ndrivers/android/binder/page_range.rs-661-unsafe extern \"C\" fn rust_shrink_count(\n--\ndrivers/android/binder/page_range.rs-672-/// Called by the shrinker.\ndrivers/android/binder/page_range.rs:673:#[no_mangle]\ndrivers/android/binder/page_range.rs-674-unsafe extern \"C\" fn rust_shrink_scan(\n--\ndrivers/android/binder/page_range.rs-697-/// Called by the shrinker.\ndrivers/android/binder/page_range.rs:698:#[no_mangle]\ndrivers/android/binder/page_range.rs-699-unsafe extern \"C\" fn rust_shrink_free_page(\n--\ndrivers/android/binder/rust_binder_main.rs=72= fn default() -\u003e Self {\n--\ndrivers/android/binder/rust_binder_main.rs-90-use kernel::bindings::rust_binder_layout;\ndrivers/android/binder/rust_binder_main.rs:91:#[no_mangle]\ndrivers/android/binder/rust_binder_main.rs-92-static RUST_BINDER_LAYOUT: rust_binder_layout = rust_binder_layout {\n--\ndrivers/android/binder/rust_binder_main.rs=322=unsafe impl\u003cT\u003e Sync for AssertSync\u003cT\u003e {}\n--\ndrivers/android/binder/rust_binder_main.rs-324-/// File operations that rust_binderfs.c can use.\ndrivers/android/binder/rust_binder_main.rs:325:#[no_mangle]\ndrivers/android/binder/rust_binder_main.rs-326-#[used]\n--\ndrivers/android/binder/rust_binder_main.rs-343-/// Only called by binderfs.\ndrivers/android/binder/rust_binder_main.rs:344:#[no_mangle]\ndrivers/android/binder/rust_binder_main.rs-345-unsafe extern \"C\" fn rust_binder_new_context(\n--\ndrivers/android/binder/rust_binder_main.rs-357-/// Only called by binderfs.\ndrivers/android/binder/rust_binder_main.rs:358:#[no_mangle]\ndrivers/android/binder/rust_binder_main.rs-359-unsafe extern \"C\" fn rust_binder_remove_context(device: *mut kernel::ffi::c_void) {\n--\ndrivers/android/binder/rust_binder_main.rs-483-/// Only called by binderfs.\ndrivers/android/binder/rust_binder_main.rs:484:#[no_mangle]\ndrivers/android/binder/rust_binder_main.rs-485-unsafe extern \"C\" fn rust_binder_stats_show(\n--\ndrivers/android/binder/rust_binder_main.rs-499-/// Only called by binderfs.\ndrivers/android/binder/rust_binder_main.rs:500:#[no_mangle]\ndrivers/android/binder/rust_binder_main.rs-501-unsafe extern \"C\" fn rust_binder_state_show(\n--\ndrivers/android/binder/rust_binder_main.rs-515-/// Only called by binderfs.\ndrivers/android/binder/rust_binder_main.rs:516:#[no_mangle]\ndrivers/android/binder/rust_binder_main.rs-517-unsafe extern \"C\" fn rust_binder_proc_show(\n--\ndrivers/android/binder/rust_binder_main.rs-533-/// Only called by binderfs.\ndrivers/android/binder/rust_binder_main.rs:534:#[no_mangle]\ndrivers/android/binder/rust_binder_main.rs-535-unsafe extern \"C\" fn rust_binder_transactions_show(\n" }
69/2	2026/09/27 08:00	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 49874 output: 41 thoughts: 30 Thoughts: Okay, let's dive into this. Here's my thought process on dissecting `rust_binder_fops`: Unpacking `rust_binder_fops` in the Rust Binder Driver Right, so I'm looking at `rust_binder_fops`, and my immediate thought is "Where is this defined, and what's its purpose?" Knowing that this is within the `drivers/android/binder` directory, I'm already expecting it to be related to the Binder driver implementation, likely the Rust-based components. The filename `rust_binder_main.rs` strongly suggests this is a key entry point or a core module for the Rust Binder code. Therefore, I anticipate `rust_binder_fops` is probably some sort of file operations structure, a crucial piece for integrating the Rust implementation with the kernel's file system interface. I'm guessing this might be how the Binder driver interacts with the kernel's VFS (Virtual File System) layer, managing device file access and communication. I'm keen to see if this handles the opening, reading, writing, and possibly even the control (ioctl) operations for the Binder device. It's likely a critical bridge between the Rust side and the kernel's device management, I should go and check it out!
70/2	2026/09/27 08:00	tool	read-file	0m Args: { "File": "drivers/android/binder/rust_binder_main.rs", "FirstLine": 320, "LineCount": 25 } Results: { "Contents": " 320:\tpub struct AssertSync\u003cT\u003e(T);\n 321:\t// SAFETY: Used only to insert C bindings types into globals, which is safe.\n 322:\tunsafe impl\u003cT\u003e Sync for AssertSync\u003cT\u003e {}\n 323:\t\n 324:\t/// File operations that rust_binderfs.c can use.\n 325:\t#[no_mangle]\n 326:\t#[used]\n 327:\tpub static rust_binder_fops: AssertSync\u003ckernel::bindings::file_operations\u003e = {\n 328:\t let ops = kernel::bindings::file_operations {\n 329:\t owner: this_module::\u003cLocalModule\u003e().as_ptr(),\n 330:\t poll: Some(rust_binder_poll),\n 331:\t unlocked_ioctl: Some(rust_binder_ioctl),\n 332:\t compat_ioctl: bindings::compat_ptr_ioctl,\n 333:\t mmap: Some(rust_binder_mmap),\n 334:\t open: Some(rust_binder_open),\n 335:\t release: Some(rust_binder_release),\n 336:\t flush: Some(rust_binder_flush),\n 337:\t ..pin_init::zeroed()\n 338:\t };\n 339:\t AssertSync(ops)\n 340:\t};\n 341:\t\n 342:\t/// # Safety\n 343:\t/// Only called by binderfs.\n 344:\t#[no_mangle]\n" }
71/2	2026/09/27 08:00	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 50632 output: 30 thoughts: 39 Thoughts: Here's my summary, as if I were thinking these thoughts: Analyzing the Binder Filesystem Interface Okay, let's dive into this `rust_binder_fops` structure. This is where the action is, right? I need to get a clear picture of how this Rust binder implementation is interacting with the kernel's binder driver. Right off the bat, I see the expected function pointers: `rust_binder_ioctl`, `rust_binder_open`, and so on. It looks like it's mapping directly to the standard filesystem operations. Let's make sure that `rust_binder_ioctl` is doing what I expect. I'll need to scrutinize how it handles the ioctl requests; that is where the meat of the binder interaction lies, the critical pieces.
72/2	2026/09/27 08:00	tool	grepper	0m Args: { "Expression": "rust_binder_ioctl", "PathPrefix": "drivers/android/binder" } Results: { "Output": "drivers/android/binder/rust_binder_main.rs=322=unsafe impl\u003cT\u003e Sync for AssertSync\u003cT\u003e {}\n--\ndrivers/android/binder/rust_binder_main.rs-330- poll: Some(rust_binder_poll),\ndrivers/android/binder/rust_binder_main.rs:331: unlocked_ioctl: Some(rust_binder_ioctl),\ndrivers/android/binder/rust_binder_main.rs-332- compat_ioctl: bindings::compat_ptr_ioctl,\n--\ndrivers/android/binder/rust_binder_main.rs-419-/// Only called by binderfs.\ndrivers/android/binder/rust_binder_main.rs:420:unsafe extern \"C\" fn rust_binder_ioctl(\ndrivers/android/binder/rust_binder_main.rs-421- file: *mut bindings::file,\n" }
73/2	2026/09/27 08:00	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 51097 output: 20 thoughts: 61 Thoughts: Okay, let's dive into this. Here's how I'm thinking about breaking this down: Investigating the Rust BinderFS Integration Right, so I need to understand the connection between `rust_binderfs.c` and `CONFIG_ANDROID_BINDER_IPC_RUST`. Clearly, the former is a file related to a Rust implementation of something binder-related, and the latter is a configuration flag. I'm guessing that flag enables or disables the functionality defined in that C file. I want to see exactly what `rust_binderfs.c` is doing. First, I'll search for `rust_binder_fops` within the `drivers/android/binder/rust_binderfs.c` file itself. That's probably the key data structure or function that ties this entire thing together. It likely contains function pointers for file operations – open, close, read, write, etc. – for the file system interface. That'll be my starting point to understand the file system side of this Rust binder integration. Let's see what that reveals.
74/2	2026/09/27 08:00	tool	grepper	0m Args: { "Expression": "rust_binder_fops" } Results: { "Output": "drivers/android/binder/rust_binder_internal.h=47=int rust_binder_proc_show(struct seq_file m, void pid);\ndrivers/android/binder/rust_binder_internal.h-48-\ndrivers/android/binder/rust_binder_internal.h:49:extern const struct file_operations rust_binder_fops;\ndrivers/android/binder/rust_binder_internal.h-50-rust_binder_context rust_binder_new_context(char name);\n--\ndrivers/android/binder/rust_binder_main.rs=322=unsafe impl\u003cT\u003e Sync for AssertSync\u003cT\u003e {}\n--\ndrivers/android/binder/rust_binder_main.rs-326-#[used]\ndrivers/android/binder/rust_binder_main.rs:327:pub static rust_binder_fops: AssertSync\u003ckernel::bindings::file_operations\u003e = {\ndrivers/android/binder/rust_binder_main.rs-328- let ops = kernel::bindings::file_operations {\n--\ndrivers/android/binder/rust_binderfs.c=117=static int binderfs_binder_device_create(struct inode ref_inode,\n--\ndrivers/android/binder/rust_binderfs.c-168-\t\t\t MKDEV(MAJOR(binderfs_dev), minor));\ndrivers/android/binder/rust_binderfs.c:169:\tinode-\u003ei_fop = \u0026rust_binder_fops;\ndrivers/android/binder/rust_binderfs.c-170-\tinode-\u003ei_uid = info-\u003eroot_uid;\n" }
75/2	2026/09/27 08:00	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 51811 output: 38 thoughts: 49 Thoughts: Okay, let's dive into this `rust_binder_fops` context. I need to understand the relationship between this and the standard binder devices. My immediate question is: does `rust_binderfs.c`, which I assume is involved in creating a binder filesystem, also handle the creation of the more traditional device nodes, such as `/dev/binder`? I'm betting that's the key to understanding how this whole mechanism fits together. I'm going to jump into a review of `rust_binderfs.c` to confirm my suspicion or uncover any unexpected behaviors. That file should provide the answers.
76/2	2026/09/27 08:00	tool	read-file	0m Args: { "File": "drivers/android/binder/rust_binderfs.c", "FirstLine": 1, "LineCount": 80 } Results: { "Contents": " 1:\t// SPDX-License-Identifier: GPL-2.0\n 2:\t\n 3:\t#include \u003clinux/compiler_types.h\u003e\n 4:\t#include \u003clinux/errno.h\u003e\n 5:\t#include \u003clinux/fs.h\u003e\n 6:\t#include \u003clinux/fsnotify.h\u003e\n 7:\t#include \u003clinux/gfp.h\u003e\n 8:\t#include \u003clinux/idr.h\u003e\n 9:\t#include \u003clinux/init.h\u003e\n 10:\t#include \u003clinux/ipc_namespace.h\u003e\n 11:\t#include \u003clinux/kdev_t.h\u003e\n 12:\t#include \u003clinux/kernel.h\u003e\n 13:\t#include \u003clinux/list.h\u003e\n 14:\t#include \u003clinux/namei.h\u003e\n 15:\t#include \u003clinux/magic.h\u003e\n 16:\t#include \u003clinux/major.h\u003e\n 17:\t#include \u003clinux/miscdevice.h\u003e\n 18:\t#include \u003clinux/module.h\u003e\n 19:\t#include \u003clinux/mutex.h\u003e\n 20:\t#include \u003clinux/mount.h\u003e\n 21:\t#include \u003clinux/fs_parser.h\u003e\n 22:\t#include \u003clinux/sched.h\u003e\n 23:\t#include \u003clinux/seq_file.h\u003e\n 24:\t#include \u003clinux/slab.h\u003e\n 25:\t#include \u003clinux/spinlock_types.h\u003e\n 26:\t#include \u003clinux/stddef.h\u003e\n 27:\t#include \u003clinux/string.h\u003e\n 28:\t#include \u003clinux/types.h\u003e\n 29:\t#include \u003clinux/uaccess.h\u003e\n 30:\t#include \u003clinux/user_namespace.h\u003e\n 31:\t#include \u003clinux/xarray.h\u003e\n 32:\t#include \u003cuapi/asm-generic/errno-base.h\u003e\n 33:\t#include \u003cuapi/linux/android/binder.h\u003e\n 34:\t#include \u003cuapi/linux/android/binderfs.h\u003e\n 35:\t\n 36:\t#include \"rust_binder.h\"\n 37:\t#include \"rust_binder_internal.h\"\n 38:\t\n 39:\t#define FIRST_INODE 1\n 40:\t#define SECOND_INODE 2\n 41:\t#define INODE_OFFSET 3\n 42:\t#define BINDERFS_MAX_MINOR (1U \u003c\u003c MINORBITS)\n 43:\t/* Ensure that the initial ipc namespace always has devices available. /\n 44:\t#define BINDERFS_MAX_MINOR_CAPPED (BINDERFS_MAX_MINOR - 4)\n 45:\t\n 46:\tDEFINE_SHOW_ATTRIBUTE(rust_binder_stats);\n 47:\tDEFINE_SHOW_ATTRIBUTE(rust_binder_state);\n 48:\tDEFINE_SHOW_ATTRIBUTE(rust_binder_transactions);\n 49:\tDEFINE_SHOW_ATTRIBUTE(rust_binder_proc);\n 50:\t\n 51:\tchar rust_binder_devices_param = CONFIG_ANDROID_BINDER_DEVICES;\n 52:\tmodule_param_named(rust_devices, rust_binder_devices_param, charp, 0444);\n 53:\t\n 54:\textern u32 rust_binder_debug_mask;\n 55:\tmodule_param_named(debug_mask, rust_binder_debug_mask, uint, 0644);\n 56:\t\n 57:\tstatic dev_t binderfs_dev;\n 58:\tstatic DEFINE_MUTEX(binderfs_minors_mutex);\n 59:\tstatic DEFINE_IDA(binderfs_minors);\n 60:\t\n 61:\tenum binderfs_param {\n 62:\t\tOpt_max,\n 63:\t\tOpt_stats_mode,\n 64:\t};\n 65:\t\n 66:\tenum binderfs_stats_mode {\n 67:\t\tbinderfs_stats_mode_unset,\n 68:\t\tbinderfs_stats_mode_global,\n 69:\t};\n 70:\t\n 71:\tstruct binder_features {\n 72:\t\tbool oneway_spam_detection;\n 73:\t\tbool extended_error;\n 74:\t\tbool freeze_notification;\n 75:\t};\n 76:\t\n 77:\tstatic const struct constant_table binderfs_param_stats[] = {\n 78:\t\t{ \"global\", binderfs_stats_mode_global },\n 79:\t\t{}\n 80:\t};\n" }
77/2	2026/09/27 08:00	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 53218 output: 24 thoughts: 1048 Thoughts: Analyzing the Rust Binder IPC Driver and Netlink Implementation Okay, let's break this down systematically. My initial goal is to understand how the Rust-based Binder IPC driver (`CONFIG_ANDROID_BINDER_IPC_RUST`) works, and I'm focusing on the netlink aspect. First, I confirm that `CONFIG_ANDROID_BINDER_IPC_RUST` enables the Rust Binder driver. Then I verify the dependencies: `RUST`, `MMU`, `NET`, and importantly, that it isn't enabled if the legacy Android Binder IPC is active. Next, I see that the `rust/kernel/lib.rs` file conditionally includes a `net` module if `CONFIG_NET` is set. I also see that `rust/kernel/net/netlink.rs` is compiled if both `CONFIG_RUST` and `CONFIG_NET` are enabled. Since the `rust/kernel/` directory gets built into `kernel.o`, the `netlink.rs` module is part of the `kernel` crate. This indicates the netlink functionality is tightly integrated into the core kernel component. The user-facing component that calls it is, in fact, `ANDROID_BINDER_IPC_RUST` via the binder driver. Now, I'm trying to rule out other callers of this netlink implementation in the kernel, and earlier analysis already indicated that the calls are limited to the binder implementation. Okay, let's dig deeper into the actual code within `netlink.rs` to see how it's used. Specifically, I'm examining the `nla_put` function because I want to look at attributes, and how errors are handled. I see the Rust code now includes a check to prevent overflow when using the `nla_put` function to write attributes to a netlink socket, using a `MAX_PAYLOAD_LEN`. The `MAX_PAYLOAD_LEN` is calculated based on the maximum size of a 16-bit integer, which is interesting because that means we are working with 16-bit field that encodes the total length. If the attribute's length exceeds that limit, an `EMSGSIZE` error is returned. Now, let's step back and look at the C function `nla_put` that's called from Rust: `bindings::nla_put(skb, attrtype, len as c_int, ptr)`. I recall that, in the C implementation, `nla_put` returns `-EMSGSIZE` if there's not enough space in the socket buffer. Looking into the C code, specifically the `nla_put` implementation, confirms the error handling. I see `nla_total_size(attrlen)` and `skb_tailroom(skb)` are the key checks: if there isn't enough tailroom, `-EMSGSIZE` is returned. So, the Rust code's check for `MAX_PAYLOAD_LEN` is mirroring the error condition in the C code, preventing the netlink buffer from overflowing. It is not clear yet whether there is a bug, but it is clear that the Rust and C implementation handle errors in a similar way.
78/2	2026/09/27 08:00	tool	grepper	0m Args: { "Expression": "static inline int nla_total_size\\(" } Results: { "Output": "include/net/netlink.h=1249=static inline int nla_attr_size(int payload)\n--\ninclude/net/netlink.h-1257- */\ninclude/net/netlink.h:1258:static inline int nla_total_size(int payload)\ninclude/net/netlink.h-1259-{\n" }
79/2	2026/09/27 08:00	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 55078 output: 37 thoughts: 27 Thoughts: Here's a first-person summary, tailored for an expert audience, based on the provided "thoughts": Diving into Netlink's Core: Socket Options Alright, time to get my hands dirty. I'm going to take a closer look at `include/net/netlink.h`, specifically around lines 1245 through 1270. This region usually contains the crucial definitions related to the socket options available for Netlink sockets. I need to refresh my understanding of how these options are structured, and how they relate to the underlying implementation. I expect to find things like the definitions of `NL_ADD_MEMBERSHIP`, `NL_DROP_MEMBERSHIP`, and potentially the associated data structures like `nlmsghdr`, and how they are handled at the lowest level. I also need to revisit the implications of setting different socket options and how they impact the flow control. It's important to understand the details here to optimize and debug Netlink applications effectively, as I know subtle differences in the options used can drastically alter performance and behavior. I'm hoping to clarify any lingering questions about the interplay of these options with the kernel's internal mechanisms for routing and message filtering.
80/2	2026/09/27 08:00	tool	read-file	0m Args: { "File": "include/net/netlink.h", "FirstLine": 1245, "LineCount": 30 } Results: { "Contents": "1245:\t/*\n1246:\t nla_attr_size - length of attribute not including padding\n1247:\t * @payload: length of payload\n1248:\t /\n1249:\tstatic inline int nla_attr_size(int payload)\n1250:\t{\n1251:\t\treturn NLA_HDRLEN + payload;\n1252:\t}\n1253:\t\n1254:\t/\n1255:\t nla_total_size - total length of attribute including padding\n1256:\t * @payload: length of payload\n1257:\t /\n1258:\tstatic inline int nla_total_size(int payload)\n1259:\t{\n1260:\t\treturn NLA_ALIGN(nla_attr_size(payload));\n1261:\t}\n1262:\t\n1263:\t/\n1264:\t nla_padlen - length of padding at the tail of attribute\n1265:\t * @payload: length of payload\n1266:\t /\n1267:\tstatic inline int nla_padlen(int payload)\n1268:\t{\n1269:\t\treturn nla_total_size(payload) - nla_attr_size(payload);\n1270:\t}\n1271:\t\n1272:\t/\n1273:\t nla_type - attribute type\n1274:\t * @nla: netlink attribute\n" }
81/2	2026/09/27 08:00	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 55794 output: 17 thoughts: 419 Thoughts: Analyzing Potential Integer Overflow in `nla_put` due to Large Attribute Length Okay, so I'm looking at this `nla_len` field, and it's a `__u16`, which means its maximum value is `U16_MAX`, or 65535. The crux of the issue is this: if `nla_put` is called with an `attrlen` (attribute length) such that `attrlen + NLA_HDRLEN` exceeds 65535, then the `nla->nla_len` field is going to overflow when it's being set in `__nla_reserve`. This is a classic integer truncation vulnerability. In the Rust code, they've got `MAX_PAYLOAD_LEN` defined, and it seems they're making a defensive check: if the provided `len` is greater than `MAX_PAYLOAD_LEN`, they return an `Err(EMSGSIZE)`. I get it: this is precisely to prevent that `nla->nla_len` integer overflow in `nla_put`. It's good, defensive programming. The question then becomes: can this scenario actually happen in the wild, say through syzkaller fuzzing? That's what I need to understand. Let's break down how `nla_put` is used. What calls `put`? Digging into the kernel codebase, it looks like `nla_put` is only called by a couple of functions: `put_u32`, which deals with `u32` values (fixed size of 4 bytes - never a problem), and `put_string`, which handles `CStr` (C-style strings). The problem might potentially arise from the length of `CStr` being variable. Now, where is `put_string` being called? Ah, here's where it gets interesting. I see it's called within `Report::context`, specifically from `drivers/android/binder/transaction.rs:101`: `report.context(&ctx.name)?`. So it's feeding the value of `ctx.name` to `put_string`, which, if its length is high enough, could trigger the overflow. Okay, let's verify. Can `ctx.name` have a length greater than 65531? I need to trace where `Context::new` is called and, critically, how those context names are constructed. I need to comb through all occurrences of `Context::new` in the codebase. That's the key to understanding if this is a real risk.
82/2	2026/09/27 08:00	tool	grepper	0m Args: { "Expression": "Context::new" } Results: { "Output": "drivers/android/binder/rust_binder_main.rs=322=unsafe impl\u003cT\u003e Sync for AssertSync\u003cT\u003e {}\n--\ndrivers/android/binder/rust_binder_main.rs-349- let name = unsafe { kernel::str::CStr::from_char_ptr(name) };\ndrivers/android/binder/rust_binder_main.rs:350: match Context::new(name) {\ndrivers/android/binder/rust_binder_main.rs-351- Ok(ctx) =\u003e Arc::into_foreign(ctx),\n--\ndrivers/gpu/drm/tyr/vm.rs=427= fn exec_op\u003c'a\u003e(\n--\ndrivers/gpu/drm/tyr/vm.rs-436- VmOpType::Map(args) =\u003e {\ndrivers/gpu/drm/tyr/vm.rs:437: let mut pt_upd = PtUpdateContext::new(\ndrivers/gpu/drm/tyr/vm.rs-438- self.dev,\n--\ndrivers/gpu/drm/tyr/vm.rs-458- VmOpType::Unmap =\u003e {\ndrivers/gpu/drm/tyr/vm.rs:459: let mut pt_upd = PtUpdateContext::new(\ndrivers/gpu/drm/tyr/vm.rs-460- self.dev,\n--\nrust/syn/expr.rs=3546= fn print_expr_closure(e: \u0026ExprClosure, tokens: \u0026mut TokenStream, fixup: FixupContext) {\n--\nrust/syn/expr.rs-3566- token::Brace::default().surround(tokens, \|tokens\| {\nrust/syn/expr.rs:3567: print_expr(\u0026e.body, tokens, FixupContext::new_stmt());\nrust/syn/expr.rs-3568- });\n--\nrust/syn/expr.rs=3618= fn to_tokens(\u0026self, tokens: \u0026mut TokenStream) {\n--\nrust/syn/expr.rs-3623- self.in_token.to_tokens(tokens);\nrust/syn/expr.rs:3624: print_expr(\u0026self.expr, tokens, FixupContext::new_condition());\nrust/syn/expr.rs-3625- self.body.brace_token.surround(tokens, \|tokens\| {\n--\nrust/syn/expr.rs=3645= fn to_tokens(\u0026self, tokens: \u0026mut TokenStream) {\n--\nrust/syn/expr.rs-3650- expr.if_token.to_tokens(tokens);\nrust/syn/expr.rs:3651: print_expr(\u0026expr.cond, tokens, FixupContext::new_condition());\nrust/syn/expr.rs-3652- expr.then_branch.to_tokens(tokens);\n--\nrust/syn/expr.rs-3671- token::Brace::default().surround(tokens, \|tokens\| {\nrust/syn/expr.rs:3672: print_expr(other, tokens, FixupContext::new_stmt());\nrust/syn/expr.rs-3673- });\n--\nrust/syn/expr.rs=3769= fn to_tokens(\u0026self, tokens: \u0026mut TokenStream) {\n--\nrust/syn/expr.rs-3771- self.match_token.to_tokens(tokens);\nrust/syn/expr.rs:3772: print_expr(\u0026self.expr, tokens, FixupContext::new_condition());\nrust/syn/expr.rs-3773- self.brace_token.surround(tokens, \|tokens\| {\n--\nrust/syn/expr.rs=4065= fn to_tokens(\u0026self, tokens: \u0026mut TokenStream) {\n--\nrust/syn/expr.rs-4068- self.while_token.to_tokens(tokens);\nrust/syn/expr.rs:4069: print_expr(\u0026self.cond, tokens, FixupContext::new_condition());\nrust/syn/expr.rs-4070- self.body.brace_token.surround(tokens, \|tokens\| {\n--\nrust/syn/expr.rs=4101= fn to_tokens(\u0026self, tokens: \u0026mut TokenStream) {\n--\nrust/syn/expr.rs-4108- self.fat_arrow_token.to_tokens(tokens);\nrust/syn/expr.rs:4109: print_expr(\u0026self.body, tokens, FixupContext::new_match_arm());\nrust/syn/expr.rs-4110- self.comma.to_tokens(tokens);\n--\nrust/syn/generics.rs=1450= pub(crate) fn print_const_argument(expr: \u0026Expr, tokens: \u0026mut TokenStream) {\n--\nrust/syn/generics.rs-1471- #[cfg(feature = \"full\")]\nrust/syn/generics.rs:1472: expr::printing::print_expr(expr, tokens, FixupContext::new_stmt());\nrust/syn/generics.rs-1473-\n--\nrust/syn/stmt.rs=437= fn to_tokens(\u0026self, tokens: \u0026mut TokenStream) {\n--\nrust/syn/stmt.rs-441- Stmt::Expr(expr, semi) =\u003e {\nrust/syn/stmt.rs:442: expr::printing::print_expr(expr, tokens, FixupContext::new_stmt());\nrust/syn/stmt.rs-443- semi.to_tokens(tokens);\n--\nrust/syn/stmt.rs=452= fn to_tokens(\u0026self, tokens: \u0026mut TokenStream) {\n--\nrust/syn/stmt.rs-468- _ =\u003e token::Brace::default().surround(tokens, \|tokens\| {\nrust/syn/stmt.rs:469: expr::printing::print_expr(diverge, tokens, FixupContext::new_stmt());\nrust/syn/stmt.rs-470- }),\n" }
83/2	2026/09/27 08:00	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 58317 output: 40 thoughts: 82 Thoughts: Okay, let's dive into this Binder context creation process. Binder Context Creation: A Deep Dive Alright, I need to understand how these Binder contexts are actually spun up. Let's see... the code suggests the pivotal function is `rust_binder_new_context(req->name)` found in `drivers/android/binder/rust_binderfs.c`. Now, the critical question arises: where does this `req->name` originate? It's essential to trace this back to its source. The logical next step is to examine `binderfs_binder_device_create` within the same file, `drivers/android/binder/rust_binderfs.c`. That's where I expect to find the clue.
84/2	2026/09/27 08:00	tool	read-file	0m Args: { "File": "drivers/android/binder/rust_binderfs.c", "FirstLine": 115, "LineCount": 55 } Results: { "Contents": " 115:\t * Return: 0 on success, negative errno on failure\n 116:\t /\n 117:\tstatic int binderfs_binder_device_create(struct inode ref_inode,\n 118:\t\t\t\t\t\t struct binderfs_device __user userp,\n 119:\t\t\t\t\t\t struct binderfs_device req)\n 120:\t{\n 121:\t\tint minor, ret;\n 122:\t\tstruct dentry dentry, root;\n 123:\t\tstruct binder_device device = NULL;\n 124:\t\trust_binder_context ctx = NULL;\n 125:\t\tstruct inode inode = NULL;\n 126:\t\tstruct super_block sb = ref_inode-\u003ei_sb;\n 127:\t\tstruct binderfs_info info = sb-\u003es_fs_info;\n 128:\t#if defined(CONFIG_IPC_NS)\n 129:\t\tbool use_reserve = (info-\u003eipc_ns == \u0026init_ipc_ns);\n 130:\t#else\n 131:\t\tbool use_reserve = true;\n 132:\t#endif\n 133:\t\n 134:\t\t/* Reserve new minor number for the new device. /\n 135:\t\tmutex_lock(\u0026binderfs_minors_mutex);\n 136:\t\tif (++info-\u003edevice_count \u003c= info-\u003emount_opts.max)\n 137:\t\t\tminor = ida_alloc_max(\u0026binderfs_minors,\n 138:\t\t\t\t\t use_reserve ? BINDERFS_MAX_MINOR - 1 :\n 139:\t\t\t\t\t\t\t BINDERFS_MAX_MINOR_CAPPED - 1,\n 140:\t\t\t\t\t GFP_KERNEL);\n 141:\t\telse\n 142:\t\t\tminor = -ENOSPC;\n 143:\t\tif (minor \u003c 0) {\n 144:\t\t\t--info-\u003edevice_count;\n 145:\t\t\tmutex_unlock(\u0026binderfs_minors_mutex);\n 146:\t\t\treturn minor;\n 147:\t\t}\n 148:\t\tmutex_unlock(\u0026binderfs_minors_mutex);\n 149:\t\n 150:\t\tret = -ENOMEM;\n 151:\t\tdevice = kzalloc_obj(device);\n 152:\t\tif (!device)\n 153:\t\t\tgoto err;\n 154:\t\n 155:\t\treq-\u003ename[BINDERFS_MAX_NAME] = '\\0'; /* NUL-terminate */\n 156:\t\n 157:\t\tctx = rust_binder_new_context(req-\u003ename);\n 158:\t\tif (!ctx)\n 159:\t\t\tgoto err;\n 160:\t\n 161:\t\tinode = new_inode(sb);\n 162:\t\tif (!inode)\n 163:\t\t\tgoto err;\n 164:\t\n 165:\t\tinode-\u003ei_ino = minor + INODE_OFFSET;\n 166:\t\tsimple_inode_init_ts(inode);\n 167:\t\tinit_special_inode(inode, S_IFCHR \| 0600,\n 168:\t\t\t\t MKDEV(MAJOR(binderfs_dev), minor));\n 169:\t\tinode-\u003ei_fop = \u0026rust_binder_fops;\n" }
85/2	2026/09/27 08:00	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 59447 output: 25 thoughts: 1207 Thoughts: Fuzzing Decision for Netlink Message Attribute Length Check Okay, let's break this down. First, the code in question: `req->name[BINDERFS_MAX_NAME] = '\0';` and `BINDERFS_MAX_NAME` is defined as 255. So, `req->name` can be at most 255 characters. And how are binder devices created initially? It is done by parsing `CONFIG_ANDROID_BINDER_DEVICES` (defaults to "binder,hwbinder,vndbinder"). So, the `ctx.name` is definitely at most 255 bytes. This means the check `len > MAX_PAYLOAD_LEN` will never be true, given the current code in the tree. But hold on, does that mean `WorthFuzzing=false`? Let's consult the triage philosophy. The key is to not blindly trust "no functional change" or "refactoring" claims. New or modified assertions in reachable code need fuzzing! So I need to carefully review the negative and positive criteria. My instructions state: return `WorthFuzzing=false` ONLY IF the modified code falls into one of these categories: non-kernel and non-executable changes, structurally unreachable hardware, or unreachable execution paths like driver teardown callbacks or architecture-specific paths. Does this apply? Absolutely not. The code modifies `rust/kernel/net/netlink.rs`, which is part of the core kernel Rust networking abstractions. The modified function `GenlMsg::put` is executed whenever a generic netlink message attribute is added (e.g. in `drivers/android/binder/netlink.rs` when reporting binder transaction events). It introduces a defensive check: `if len > MAX_PAYLOAD_LEN { return Err(EMSGSIZE); }` The instructions clearly state that "Runtime Assertions and Defensive Checks" and "Reachable Drivers and Protocols" (specifically, netlink) require fuzzing. This falls under both! Therefore, `WorthFuzzing=true`. Now to define the fuzzing setup: 1. `EnableConfigs`: I need to figure out what configurations are required for `rust/kernel/net/netlink.rs` and its callers to be compiled. I need to look into `rust/kernel/mod.rs`, `rust/kernel/lib.rs` and the Android-specific driver Kconfig files. Specifically, I see that `rust/kernel/lib.rs` has a conditional module inclusion: `#[cfg(CONFIG_NET)] pub mod net;`. So I'll need `RUST` and `NET`. Does the code in `rust/kernel/net/netlink.rs` use C bindings for generic netlink? Yes, there are `use kernel::bindings;` declarations. I see functions like `bindings::genlmsg_new`, `bindings::genlmsg_put`, and `bindings::genlmsg_multicast`. Where are those C functions defined? They are in `include/net/genetlink.h`. Therefore, I need to figure out what config options enable generic netlink by grepping for `genetlink` or `CONFIG_NET` in `net/Makefile` and `net/netlink/Makefile`. 2. `FocusSymbols`: I need to focus on `GenlMsg::put` and any related structures, especially around netlink message attribute handling within the Rust code and any relevant C bindings. 3. `Reasoning`: The reasoning is that a new defensive check has been added which could be bypassed in unexpected ways. This could potentially lead to buffer overflows or denial-of-service, even if the current callers seem safe. This also ensures there are no logical flaws or integer overflows.
86/2	2026/09/27 08:01	tool	grepper	0m Args: { "Expression": "genetlink", "PathPrefix": "net/" } Results: { "Output": "net/batman-adv/bat_algo.c-17-#include \u003clinux/types.h\u003e\nnet/batman-adv/bat_algo.c:18:#include \u003cnet/genetlink.h\u003e\nnet/batman-adv/bat_algo.c-19-#include \u003cnet/netlink.h\u003e\n--\nnet/batman-adv/bat_iv_ogm.c-43-#include \u003clinux/workqueue.h\u003e\nnet/batman-adv/bat_iv_ogm.c:44:#include \u003cnet/genetlink.h\u003e\nnet/batman-adv/bat_iv_ogm.c-45-#include \u003cnet/netlink.h\u003e\n--\nnet/batman-adv/bat_v.c-28-#include \u003clinux/workqueue.h\u003e\nnet/batman-adv/bat_v.c:29:#include \u003cnet/genetlink.h\u003e\nnet/batman-adv/bat_v.c-30-#include \u003cnet/netlink.h\u003e\n--\nnet/batman-adv/bridge_loop_avoidance.c-40-#include \u003cnet/arp.h\u003e\nnet/batman-adv/bridge_loop_avoidance.c:41:#include \u003cnet/genetlink.h\u003e\nnet/batman-adv/bridge_loop_avoidance.c-42-#include \u003cnet/netlink.h\u003e\n--\nnet/batman-adv/distributed-arp-table.c-38-#include \u003cnet/arp.h\u003e\nnet/batman-adv/distributed-arp-table.c:39:#include \u003cnet/genetlink.h\u003e\nnet/batman-adv/distributed-arp-table.c-40-#include \u003cnet/netlink.h\u003e\n--\nnet/batman-adv/main.c-38-#include \u003cnet/dsfield.h\u003e\nnet/batman-adv/main.c:39:#include \u003cnet/genetlink.h\u003e\nnet/batman-adv/main.c-40-#include \u003cnet/rtnetlink.h\u003e\n--\nnet/batman-adv/multicast.c-44-#include \u003cnet/addrconf.h\u003e\nnet/batman-adv/multicast.c:45:#include \u003cnet/genetlink.h\u003e\nnet/batman-adv/multicast.c-46-#include \u003cnet/if_inet6.h\u003e\n--\nnet/batman-adv/netlink.c-32-#include \u003clinux/utsname.h\u003e\nnet/batman-adv/netlink.c:33:#include \u003cnet/genetlink.h\u003e\nnet/batman-adv/netlink.c-34-#include \u003cnet/net_namespace.h\u003e\n--\nnet/batman-adv/translation-table.c-41-#include \u003clinux/workqueue.h\u003e\nnet/batman-adv/translation-table.c:42:#include \u003cnet/genetlink.h\u003e\nnet/batman-adv/translation-table.c-43-#include \u003cnet/netlink.h\u003e\n--\nnet/bridge/br_cfm_netlink.c-2-\nnet/bridge/br_cfm_netlink.c:3:#include \u003cnet/genetlink.h\u003e\nnet/bridge/br_cfm_netlink.c-4-\n--\nnet/bridge/br_mrp_netlink.c-2-\nnet/bridge/br_mrp_netlink.c:3:#include \u003cnet/genetlink.h\u003e\nnet/bridge/br_mrp_netlink.c-4-\n--\nnet/core/drop_monitor.c-29-#include \u003clinux/module.h\u003e\nnet/core/drop_monitor.c:30:#include \u003cnet/genetlink.h\u003e\nnet/core/drop_monitor.c-31-#include \u003cnet/netevent.h\u003e\n--\nnet/core/netdev-genl-gen.c-7-#include \u003cnet/netlink.h\u003e\nnet/core/netdev-genl-gen.c:8:#include \u003cnet/genetlink.h\u003e\nnet/core/netdev-genl-gen.c-9-\n--\nnet/core/netdev-genl-gen.h-10-#include \u003cnet/netlink.h\u003e\nnet/core/netdev-genl-gen.h:11:#include \u003cnet/genetlink.h\u003e\nnet/core/netdev-genl-gen.h-12-\n--\nnet/devlink/core.c-6-\nnet/devlink/core.c:7:#include \u003cnet/genetlink.h\u003e\nnet/devlink/core.c-8-#define CREATE_TRACE_POINTS\n--\nnet/devlink/dev.c-7-#include \u003clinux/device.h\u003e\nnet/devlink/dev.c:8:#include \u003cnet/genetlink.h\u003e\nnet/devlink/dev.c-9-#include \u003cnet/sock.h\u003e\n--\nnet/devlink/health.c-6-\nnet/devlink/health.c:7:#include \u003cnet/genetlink.h\u003e\nnet/devlink/health.c-8-#include \u003cnet/sock.h\u003e\n--\nnet/devlink/netlink.c-6-\nnet/devlink/netlink.c:7:#include \u003cnet/genetlink.h\u003e\nnet/devlink/netlink.c-8-#include \u003cnet/sock.h\u003e\n--\nnet/devlink/netlink_gen.c-7-#include \u003cnet/netlink.h\u003e\nnet/devlink/netlink_gen.c:8:#include \u003cnet/genetlink.h\u003e\nnet/devlink/netlink_gen.c-9-\n--\nnet/devlink/netlink_gen.h-10-#include \u003cnet/netlink.h\u003e\nnet/devlink/netlink_gen.h:11:#include \u003cnet/genetlink.h\u003e\nnet/devlink/netlink_gen.h-12-\n--\nnet/ethtool/netlink.c=260=int ethnl_fill_reply_header(struct sk_buff skb, struct net_device dev,\n--\nnet/ethtool/netlink.c-287- * ethnl_reply_init() - Create skb for a reply and fill device identification\nnet/ethtool/netlink.c:288: * @payload: payload length (without netlink and genetlink header)\nnet/ethtool/netlink.c-289- * @dev: device the reply is about (may be null)\n--\nnet/ethtool/netlink.c-291- * @hdr_attrtype: attribute type for common header\nnet/ethtool/netlink.c:292: * @info: genetlink info of the received packet we respond to\nnet/ethtool/netlink.c-293- * @ehdrp: place to store payload pointer returned by genlmsg_new()\n--\nnet/ethtool/netlink.c=1155=static struct notifier_block ethnl_netdev_notifier = {\n--\nnet/ethtool/netlink.c-1158-\nnet/ethtool/netlink.c:1159:/* genetlink setup /\nnet/ethtool/netlink.c-1160-\n--\nnet/ethtool/netlink.c=1597=static int __init ethnl_init(void)\n--\nnet/ethtool/netlink.c-1601-\tret = genl_register_family(\u0026ethtool_genl_family);\nnet/ethtool/netlink.c:1602:\tif (WARN(ret \u003c 0, \"ethtool: genetlink family registration failed\"))\nnet/ethtool/netlink.c-1603-\t\treturn ret;\n--\nnet/ethtool/netlink.h-7-#include \u003clinux/netdevice.h\u003e\nnet/ethtool/netlink.h:8:#include \u003cnet/genetlink.h\u003e\nnet/ethtool/netlink.h-9-#include \u003cnet/sock.h\u003e\n--\nnet/handshake/genl.c-7-#include \u003cnet/netlink.h\u003e\nnet/handshake/genl.c:8:#include \u003cnet/genetlink.h\u003e\nnet/handshake/genl.c-9-\n--\nnet/handshake/genl.h-10-#include \u003cnet/netlink.h\u003e\nnet/handshake/genl.h:11:#include \u003cnet/genetlink.h\u003e\nnet/handshake/genl.h-12-\n--\nnet/handshake/handshake-test.c-13-#include \u003cnet/sock.h\u003e\nnet/handshake/handshake-test.c:14:#include \u003cnet/genetlink.h\u003e\nnet/handshake/handshake-test.c-15-#include \u003cnet/netns/generic.h\u003e\n--\nnet/handshake/netlink.c-17-#include \u003cnet/sock.h\u003e\nnet/handshake/netlink.c:18:#include \u003cnet/genetlink.h\u003e\nnet/handshake/netlink.c-19-#include \u003cnet/netns/generic.h\u003e\n--\nnet/handshake/request.c-19-#include \u003cnet/sock.h\u003e\nnet/handshake/request.c:20:#include \u003cnet/genetlink.h\u003e\nnet/handshake/request.c-21-#include \u003cnet/netns/generic.h\u003e\n--\nnet/handshake/tlshd.c-19-#include \u003cnet/handshake.h\u003e\nnet/handshake/tlshd.c:20:#include \u003cnet/genetlink.h\u003e\nnet/handshake/tlshd.c-21-#include \u003cnet/tls_prot.h\u003e\n--\nnet/handshake/trace.c-15-#include \u003cnet/netlink.h\u003e\nnet/handshake/trace.c:16:#include \u003cnet/genetlink.h\u003e\nnet/handshake/trace.c-17-\n--\nnet/hsr/hsr_netlink.c-12-#include \u003cnet/rtnetlink.h\u003e\nnet/hsr/hsr_netlink.c:13:#include \u003cnet/genetlink.h\u003e\nnet/hsr/hsr_netlink.c-14-#include \"hsr_main.h\"\n--\nnet/ieee802154/ieee802154.h=51=extern struct genl_family nl802154_family;\nnet/ieee802154/ieee802154.h-52-\nnet/ieee802154/ieee802154.h:53:/ genetlink ops/groups /\nnet/ieee802154/ieee802154.h-54-int ieee802154_list_phy(struct sk_buff skb, struct genl_info info);\n--\nnet/ieee802154/netlink.c-14-#include \u003clinux/gfp.h\u003e\nnet/ieee802154/netlink.c:15:#include \u003cnet/genetlink.h\u003e\nnet/ieee802154/netlink.c-16-#include \u003clinux/nl802154.h\u003e\n--\nnet/ieee802154/nl-mac.c-18-#include \u003cnet/netlink.h\u003e\nnet/ieee802154/nl-mac.c:19:#include \u003cnet/genetlink.h\u003e\nnet/ieee802154/nl-mac.c-20-#include \u003cnet/sock.h\u003e\n--\nnet/ieee802154/nl-phy.c-16-#include \u003cnet/netlink.h\u003e\nnet/ieee802154/nl-phy.c:17:#include \u003cnet/genetlink.h\u003e\nnet/ieee802154/nl-phy.c-18-#include \u003cnet/cfg802154.h\u003e\n--\nnet/ieee802154/nl802154.c-12-#include \u003cnet/cfg802154.h\u003e\nnet/ieee802154/nl802154.c:13:#include \u003cnet/genetlink.h\u003e\nnet/ieee802154/nl802154.c-14-#include \u003cnet/mac802154.h\u003e\n--\nnet/ipv4/fou_core.c-10-#include \u003clinux/kernel.h\u003e\nnet/ipv4/fou_core.c:11:#include \u003cnet/genetlink.h\u003e\nnet/ipv4/fou_core.c-12-#include \u003cnet/gro.h\u003e\n--\nnet/ipv4/fou_core.c-19-#include \u003cuapi/linux/fou.h\u003e\nnet/ipv4/fou_core.c:20:#include \u003cuapi/linux/genetlink.h\u003e\nnet/ipv4/fou_core.c-21-\n--\nnet/ipv4/fou_nl.c-7-#include \u003cnet/netlink.h\u003e\nnet/ipv4/fou_nl.c:8:#include \u003cnet/genetlink.h\u003e\nnet/ipv4/fou_nl.c-9-\n--\nnet/ipv4/fou_nl.h-10-#include \u003cnet/netlink.h\u003e\nnet/ipv4/fou_nl.h:11:#include \u003cnet/genetlink.h\u003e\nnet/ipv4/fou_nl.h-12-\n--\nnet/ipv4/tcp_metrics.c-21-#include \u003cnet/tcp.h\u003e\nnet/ipv4/tcp_metrics.c:22:#include \u003cnet/genetlink.h\u003e\nnet/ipv4/tcp_metrics.c-23-\n--\nnet/ipv6/ila/ila.h-16-#include \u003cnet/checksum.h\u003e\nnet/ipv6/ila/ila.h:17:#include \u003cnet/genetlink.h\u003e\nnet/ipv6/ila/ila.h-18-#include \u003cnet/ip.h\u003e\n--\nnet/ipv6/ila/ila_main.c-1-// SPDX-License-Identifier: GPL-2.0\nnet/ipv6/ila/ila_main.c:2:#include \u003cnet/genetlink.h\u003e\nnet/ipv6/ila/ila_main.c-3-#include \u003cnet/netns/generic.h\u003e\nnet/ipv6/ila/ila_main.c:4:#include \u003cuapi/linux/genetlink.h\u003e\nnet/ipv6/ila/ila_main.c-5-#include \"ila.h\"\n--\nnet/ipv6/ila/ila_xlat.c-6-#include \u003clinux/vmalloc.h\u003e\nnet/ipv6/ila/ila_xlat.c:7:#include \u003cnet/genetlink.h\u003e\nnet/ipv6/ila/ila_xlat.c-8-#include \u003cnet/netns/generic.h\u003e\nnet/ipv6/ila/ila_xlat.c:9:#include \u003cuapi/linux/genetlink.h\u003e\nnet/ipv6/ila/ila_xlat.c-10-#include \"ila.h\"\n--\nnet/ipv6/ioam6.c-18-#include \u003cnet/addrconf.h\u003e\nnet/ipv6/ioam6.c:19:#include \u003cnet/genetlink.h\u003e\nnet/ipv6/ioam6.c-20-#include \u003cnet/ioam6.h\u003e\n--\nnet/ipv6/seg6.c-20-#include \u003cnet/seg6.h\u003e\nnet/ipv6/seg6.c:21:#include \u003cnet/genetlink.h\u003e\nnet/ipv6/seg6.c-22-#include \u003clinux/seg6.h\u003e\n--\nnet/ipv6/seg6_hmac.c-39-#include \u003cnet/seg6.h\u003e\nnet/ipv6/seg6_hmac.c:40:#include \u003cnet/genetlink.h\u003e\nnet/ipv6/seg6_hmac.c-41-#include \u003cnet/seg6_hmac.h\u003e\n--\nnet/l2tp/l2tp_core.h=158=struct l2tp_tunnel {\n--\nnet/l2tp/l2tp_core.h-185-\nnet/l2tp/l2tp_core.h:186:/ Pseudowire ops callbacks for use with the l2tp genetlink interface /\nnet/l2tp/l2tp_core.h-187-struct l2tp_nl_cmd_ops {\n--\nnet/l2tp/l2tp_netlink.c-15-#include \u003cnet/sock.h\u003e\nnet/l2tp/l2tp_netlink.c:16:#include \u003cnet/genetlink.h\u003e\nnet/l2tp/l2tp_netlink.c-17-#include \u003cnet/udp.h\u003e\n--\nnet/mptcp/mptcp_pm_gen.c-7-#include \u003cnet/netlink.h\u003e\nnet/mptcp/mptcp_pm_gen.c:8:#include \u003cnet/genetlink.h\u003e\nnet/mptcp/mptcp_pm_gen.c-9-\n--\nnet/mptcp/mptcp_pm_gen.h-10-#include \u003cnet/netlink.h\u003e\nnet/mptcp/mptcp_pm_gen.h:11:#include \u003cnet/genetlink.h\u003e\nnet/mptcp/mptcp_pm_gen.h-12-\n--\nnet/mptcp/protocol.h-13-#include \u003cuapi/linux/mptcp.h\u003e\nnet/mptcp/protocol.h:14:#include \u003cnet/genetlink.h\u003e\nnet/mptcp/protocol.h-15-#include \u003cnet/rstreason.h\u003e\n--\nnet/ncsi/ncsi-cmd.c-15-#include \u003cnet/sock.h\u003e\nnet/ncsi/ncsi-cmd.c:16:#include \u003cnet/genetlink.h\u003e\nnet/ncsi/ncsi-cmd.c-17-\n--\nnet/ncsi/ncsi-manage.c-18-#include \u003cnet/ipv6.h\u003e\nnet/ncsi/ncsi-manage.c:19:#include \u003cnet/genetlink.h\u003e\nnet/ncsi/ncsi-manage.c-20-\n--\nnet/ncsi/ncsi-netlink.c-10-#include \u003clinux/etherdevice.h\u003e\nnet/ncsi/ncsi-netlink.c:11:#include \u003cnet/genetlink.h\u003e\nnet/ncsi/ncsi-netlink.c-12-#include \u003cnet/ncsi.h\u003e\n--\nnet/ncsi/ncsi-rsp.c-15-#include \u003cnet/sock.h\u003e\nnet/ncsi/ncsi-rsp.c:16:#include \u003cnet/genetlink.h\u003e\nnet/ncsi/ncsi-rsp.c-17-\n--\nnet/netfilter/ipvs/ip_vs_ctl.c-43-#include \u003cnet/sock.h\u003e\nnet/netfilter/ipvs/ip_vs_ctl.c:44:#include \u003cnet/genetlink.h\u003e\nnet/netfilter/ipvs/ip_vs_ctl.c-45-\n--\nnet/netfilter/ipvs/ip_vs_ctl.c=3951=static struct nf_sockopt_ops ip_vs_sockopts = {\n--\nnet/netfilter/ipvs/ip_vs_ctl.c-3965-\nnet/netfilter/ipvs/ip_vs_ctl.c:3966:/ IPVS genetlink family /\nnet/netfilter/ipvs/ip_vs_ctl.c-3967-static struct genl_family ip_vs_genl_family;\n--\nnet/netlabel/netlabel_calipso.c-24-#include \u003cnet/netlink.h\u003e\nnet/netlabel/netlabel_calipso.c:25:#include \u003cnet/genetlink.h\u003e\nnet/netlabel/netlabel_calipso.c-26-#include \u003cnet/netlabel.h\u003e\n--\nnet/netlabel/netlabel_cipso_v4.c-23-#include \u003cnet/netlink.h\u003e\nnet/netlabel/netlabel_cipso_v4.c:24:#include \u003cnet/genetlink.h\u003e\nnet/netlabel/netlabel_cipso_v4.c-25-#include \u003cnet/netlabel.h\u003e\n--\nnet/netlabel/netlabel_mgmt.c-24-#include \u003cnet/netlink.h\u003e\nnet/netlabel/netlabel_mgmt.c:25:#include \u003cnet/genetlink.h\u003e\nnet/netlabel/netlabel_mgmt.c-26-#include \u003cnet/ip.h\u003e\n--\nnet/netlabel/netlabel_unlabeled.c-33-#include \u003cnet/netlink.h\u003e\nnet/netlabel/netlabel_unlabeled.c:34:#include \u003cnet/genetlink.h\u003e\nnet/netlabel/netlabel_unlabeled.c-35-#include \u003cnet/ip.h\u003e\n--\nnet/netlabel/netlabel_user.c-25-#include \u003cnet/netlink.h\u003e\nnet/netlabel/netlabel_user.c:26:#include \u003cnet/genetlink.h\u003e\nnet/netlabel/netlabel_user.c-27-#include \u003cnet/netlabel.h\u003e\n--\nnet/netlabel/netlabel_user.h-23-#include \u003cnet/netlink.h\u003e\nnet/netlabel/netlabel_user.h:24:#include \u003cnet/genetlink.h\u003e\nnet/netlabel/netlabel_user.h-25-#include \u003cnet/netlabel.h\u003e\n--\nnet/netlink/Makefile-5-\nnet/netlink/Makefile:6:obj-y \t\t\t\t:= af_netlink.o genetlink.o policy.o\nnet/netlink/Makefile-7-\n--\nnet/netlink/af_netlink.c-75-#include \"af_netlink.h\"\nnet/netlink/af_netlink.c:76:#include \"genetlink.h\"\nnet/netlink/af_netlink.c-77-\n--\nnet/netlink/af_netlink.c=718=static int netlink_release(struct socket sock)\n--\nnet/netlink/af_netlink.c-737-\t/* must not acquire netlink_table_lock in any way again before unbind\nnet/netlink/af_netlink.c:738:\t * and notifying genetlink is done as otherwise it might deadlock\nnet/netlink/af_netlink.c-739-\t /\n--\nnet/netlink/genetlink.c-22-#include \u003cnet/sock.h\u003e\nnet/netlink/genetlink.c:23:#include \u003cnet/genetlink.h\u003e\nnet/netlink/genetlink.c-24-\nnet/netlink/genetlink.c:25:#include \"genetlink.h\"\nnet/netlink/genetlink.c-26-\n--\nnet/netlink/genetlink.h-6-\nnet/netlink/genetlink.h:7:/ for synchronisation between af_netlink and genetlink /\nnet/netlink/genetlink.h-8-extern atomic_t genl_sk_destructing_cnt;\n--\nnet/nfc/core.c-18-\nnet/nfc/core.c:19:#include \u003cnet/genetlink.h\u003e\nnet/nfc/core.c-20-\n--\nnet/nfc/netlink.c-17-\nnet/nfc/netlink.c:18:#include \u003cnet/genetlink.h\u003e\nnet/nfc/netlink.c-19-#include \u003clinux/nfc.h\u003e\n--\nnet/openvswitch/conntrack.c-13-#include \u003cnet/ip.h\u003e\nnet/openvswitch/conntrack.c:14:#include \u003cnet/genetlink.h\u003e\nnet/openvswitch/conntrack.c-15-#include \u003cnet/netfilter/nf_conntrack_core.h\u003e\n--\nnet/openvswitch/datapath.c-35-#include \u003clinux/dmi.h\u003e\nnet/openvswitch/datapath.c:36:#include \u003cnet/genetlink.h\u003e\nnet/openvswitch/datapath.c-37-#include \u003cnet/gso.h\u003e\n--\nnet/openvswitch/dp_notify.c-6-#include \u003clinux/netdevice.h\u003e\nnet/openvswitch/dp_notify.c:7:#include \u003cnet/genetlink.h\u003e\nnet/openvswitch/dp_notify.c-8-#include \u003cnet/netns/generic.h\u003e\n--\nnet/openvswitch/meter.c-16-#include \u003cnet/netlink.h\u003e\nnet/openvswitch/meter.c:17:#include \u003cnet/genetlink.h\u003e\nnet/openvswitch/meter.c-18-\n--\nnet/psample/psample.c-14-#include \u003cnet/netlink.h\u003e\nnet/psample/psample.c:15:#include \u003cnet/genetlink.h\u003e\nnet/psample/psample.c-16-#include \u003cnet/psample.h\u003e\n--\nnet/psp/psp-nl-gen.c-7-#include \u003cnet/netlink.h\u003e\nnet/psp/psp-nl-gen.c:8:#include \u003cnet/genetlink.h\u003e\nnet/psp/psp-nl-gen.c-9-\n--\nnet/psp/psp-nl-gen.h-10-#include \u003cnet/netlink.h\u003e\nnet/psp/psp-nl-gen.h:11:#include \u003cnet/genetlink.h\u003e\nnet/psp/psp-nl-gen.h-12-\n--\nnet/psp/psp_nl.c-6-#include \u003clinux/xarray.h\u003e\nnet/psp/psp_nl.c:7:#include \u003cnet/genetlink.h\u003e\nnet/psp/psp_nl.c-8-#include \u003cnet/psp.h\u003e\n--\nnet/shaper/shaper_nl_gen.c-7-#include \u003cnet/netlink.h\u003e\nnet/shaper/shaper_nl_gen.c:8:#include \u003cnet/genetlink.h\u003e\nnet/shaper/shaper_nl_gen.c-9-\n--\nnet/shaper/shaper_nl_gen.h-10-#include \u003cnet/netlink.h\u003e\nnet/shaper/shaper_nl_gen.h:11:#include \u003cnet/genetlink.h\u003e\nnet/shaper/shaper_nl_gen.h-12-\n--\nnet/smc/smc.h-16-#include \u003clinux/compiler.h\u003e / __aligned */\nnet/smc/smc.h:17:#include \u003cnet/genetlink.h\u003e\nnet/smc/smc.h-18-#include \u003cnet/sock.h\u003e\n--\nnet/smc/smc_core.h-19-#include \u003crdma/ib_verbs.h\u003e\nnet/smc/smc_core.h:20:#include \u003cnet/genetlink.h\u003e\nnet/smc/smc_core.h-21-#include \u003cnet/smc.h\u003e\n--\nnet/smc/smc_netlink.h-15-#include \u003cnet/netlink.h\u003e\nnet/smc/smc_netlink.h:16:#include \u003cnet/genetlink.h\u003e\nnet/smc/smc_netlink.h-17-\n--\nnet/smc/smc_pnet.c-16-#include \u003cnet/netlink.h\u003e\nnet/smc/smc_pnet.c:17:#include \u003cnet/genetlink.h\u003e\nnet/smc/smc_pnet.c-18-\n--\nnet/smc/smc_stats.c-15-#include \u003clinux/smc.h\u003e\nnet/smc/smc_stats.c:16:#include \u003cnet/genetlink.h\u003e\nnet/smc/smc_stats.c-17-#include \u003cnet/sock.h\u003e\n--\nnet/sunrpc/cache.c-35-#include \u003clinux/sunrpc/rpc_pipe_fs.h\u003e\nnet/sunrpc/cache.c:36:#include \u003cnet/genetlink.h\u003e\nnet/sunrpc/cache.c-37-#include \u003ctrace/events/sunrpc.h\u003e\n--\nnet/sunrpc/netlink.c-7-#include \u003cnet/netlink.h\u003e\nnet/sunrpc/netlink.c:8:#include \u003cnet/genetlink.h\u003e\nnet/sunrpc/netlink.c-9-\n--\nnet/sunrpc/netlink.h-10-#include \u003cnet/netlink.h\u003e\nnet/sunrpc/netlink.h:11:#include \u003cnet/genetlink.h\u003e\nnet/sunrpc/netlink.h-12-\n--\nnet/sunrpc/sunrpc_syms.c-25-\nnet/sunrpc/sunrpc_syms.c:26:#include \u003cnet/genetlink.h\u003e\nnet/sunrpc/sunrpc_syms.c-27-\n--\nnet/sunrpc/svcauth_unix.c-19-#include \u003clinux/user_namespace.h\u003e\nnet/sunrpc/svcauth_unix.c:20:#include \u003cnet/genetlink.h\u003e\nnet/sunrpc/svcauth_unix.c-21-#include \u003cuapi/linux/sunrpc_netlink.h\u003e\n--\nnet/tipc/bearer.h-42-#include \"msg.h\"\nnet/tipc/bearer.h:43:#include \u003cnet/genetlink.h\u003e\nnet/tipc/bearer.h-44-\n--\nnet/tipc/core.h-62-#include \u003clinux/rhashtable.h\u003e\nnet/tipc/core.h:63:#include \u003cnet/genetlink.h\u003e\nnet/tipc/core.h-64-#include \u003cnet/netns/hash.h\u003e\n--\nnet/tipc/link.h-39-\nnet/tipc/link.h:40:#include \u003cnet/genetlink.h\u003e\nnet/tipc/link.h-41-#include \"msg.h\"\n--\nnet/tipc/monitor.c-35-\nnet/tipc/monitor.c:36:#include \u003cnet/genetlink.h\u003e\nnet/tipc/monitor.c-37-#include \"core.h\"\n--\nnet/tipc/net.h-39-\nnet/tipc/net.h:40:#include \u003cnet/genetlink.h\u003e\nnet/tipc/net.h-41-\n--\nnet/tipc/netlink.c-44-#include \"udp_media.h\"\nnet/tipc/netlink.c:45:#include \u003cnet/genetlink.h\u003e\nnet/tipc/netlink.c-46-\n--\nnet/tipc/netlink_compat.c-40-#include \"net.h\"\nnet/tipc/netlink_compat.c:41:#include \u003cnet/genetlink.h\u003e\nnet/tipc/netlink_compat.c-42-#include \u003clinux/string_helpers.h\u003e\n--\nnet/tipc/socket.h-38-#include \u003cnet/sock.h\u003e\nnet/tipc/socket.h:39:#include \u003cnet/genetlink.h\u003e\nnet/tipc/socket.h-40-\n--\nnet/wireless/core.c-24-#include \u003clinux/sched.h\u003e\nnet/wireless/core.c:25:#include \u003cnet/genetlink.h\u003e\nnet/wireless/core.c-26-#include \u003cnet/cfg80211.h\u003e\n--\nnet/wireless/core.h-16-#include \u003clinux/rtnetlink.h\u003e\nnet/wireless/core.h:17:#include \u003cnet/genetlink.h\u003e\nnet/wireless/core.h-18-#include \u003cnet/cfg80211.h\u003e\n--\nnet/wireless/nl80211.c-25-#include \u003cnet/net_namespace.h\u003e\nnet/wireless/nl80211.c:26:#include \u003cnet/genetlink.h\u003e\nnet/wireless/nl80211.c-27-#include \u003cnet/cfg80211.h\u003e\n" }
87/2	2026/09/27 08:01	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 69645 output: 33 thoughts: 450 Thoughts: Analyzing the Interplay of Rust Netlink and Binder in the Kernel Okay, let's break this down. First, I'm examining the kernel build configuration, specifically concerning Netlink and its Rust implementation. The `net/netlink/Makefile` shows that `genetlink` is a core component, always compiled when `CONFIG_NET` is enabled, which is the baseline. Now, the Rust netlink code, found in `rust/kernel/net/netlink.rs`, gets incorporated when both `CONFIG_RUST` and `CONFIG_NET` are set – makes perfect sense. My interest now lies in the interaction of Binder IPC with these elements. I see `CONFIG_ANDROID_BINDER_IPC_RUST` as a potential consumer, which requires `CONFIG_RUST`, `CONFIG_MMU`, `CONFIG_NET`, and crucially, not `CONFIG_ANDROID_BINDER_IPC`. This condition is important. And I need to understand how `CONFIG_ANDROID_BINDERFS` fits into this landscape. My initial thought was that `ANDROID_BINDERFS` might be a prerequisite, but I must confirm this. The `drivers/android/Kconfig` file is crucial for this. In fact, `ANDROID_BINDERFS` depends on `ANDROID_BINDER_IPC`. However, now I'm seeing a potential discrepancy. Checking `drivers/android/binder/Makefile`, I see that `obj-$(CONFIG_ANDROID_BINDER_IPC_RUST) += rust_binder.o`, and `rust_binder-y := rust_binder_main.o rust_binderfs.o ...`. Here's the key: `rust_binderfs.o` (and consequently, `rust_binderfs.c`) is built unconditionally when `CONFIG_ANDROID_BINDER_IPC_RUST` is enabled, regardless of whether `ANDROID_BINDERFS` is also set. This is a crucial clarification. This should be verified through `rust_binder_main.rs` and the `drivers/android/binder/Makefile` to make sure I haven't missed anything.
88/2	2026/09/27 08:01	tool	read-file	0m Args: { "File": "drivers/android/binder/Makefile", "FirstLine": 1, "LineCount": 35 } Results: { "Contents": " 1:\t# SPDX-License-Identifier: GPL-2.0-only\n 2:\tccflags-y += -I$(src)\t# needed for trace events\n 3:\t\n 4:\tobj-$(CONFIG_ANDROID_BINDER_IPC_RUST) += rust_binder.o\n 5:\trust_binder-y := \\\n 6:\t\trust_binder_main.o\t\\\n 7:\t\trust_binderfs.o\t\t\\\n 8:\t\trust_binder_events.o\n" }
89/2	2026/09/27 08:01	llm	patch-evaluator-compressor	0m Model: gemini-3.7-flash Args: null Results: null Reply: ### WORKSPACE & COMMIT SUMMARY - Target Architecture: `amd64` - Reviewed Commit: `ef8d6ba44859a1048a43b1823c1f1db063eda625` (`syz-cluster: applied patch under review`) - Modified File: `rust/kernel/net/netlink.rs` - Diff Breakdown: In `GenlMsg::put<T>(&mut self, attrtype: c_int, value: &T) -> Result`: Added length boundary check preventing payload length from exceeding `u16::MAX - sizeof(nlattr)`. ```rust const MAX_PAYLOAD_LEN: usize = u16_as_usize(u16::MAX) - size_of::<bindings::nlattr>(); let skb = self.skb.skb.as_ptr(); let len = size_of_val(value); let ptr = core::ptr::from_ref(value).cast::<c_void>(); if len > MAX_PAYLOAD_LEN { return Err(EMSGSIZE); } to_result(unsafe { bindings::nla_put(skb, attrtype, len as c_int, ptr) }) ``` --- ### INVESTIGATION PROGRESS & RESULTS 1. Subsystem and Call Chain Analysis: - `rust/kernel/net/netlink.rs` provides generic netlink abstractions for the kernel Rust support. - Guarded in `rust/kernel/lib.rs` by `#[cfg(CONFIG_NET)]` and `rust/kernel/net/mod.rs`. - `GenlMsg::put` is called by `put_u32` and `put_string` in `rust/kernel/net/netlink.rs`. - The primary and only current in-tree consumer is the Rust version of the Android Binder driver (`drivers/android/binder/`). - Specifically: - `drivers/android/binder/netlink.rs`: `Report::error`, `Report::context`, `Report::from_pid`, `Report::from_tid`, `Report::to_pid`, `Report::to_tid`, `Report::flags`, `Report::code`, `Report::data_size`. - `drivers/android/binder/transaction.rs`: `report_netlink_inner` / `report_netlink` generates netlink multicast reports on binder transaction errors/failures when netlink listeners exist (`Report::has_listeners()`). - `drivers/android/binder/thread.rs`: `Thread::transaction` calls `info.report_netlink(...)` during binder transactions. 2. Reachability Evaluation: - The modified code is in executable kernel Rust networking logic. - Reachable via userspace binder transactions (`/dev/binder`, binderfs) when multicast netlink reporting is enabled and listening on `BINDER_NL_FAMILY` ("binder"). - Meets positive criteria under section 3 (reachable drivers/protocols, defensive checks, refactorings). - Does NOT qualify for negative criteria (not architecture-exclusive, not unreachable hardware, not vendor ASIC, not documentation/tests). 3. Kconfig Dependencies: - `CONFIG_RUST` - `CONFIG_NET` - `CONFIG_ANDROID_BINDER_IPC_RUST` (depends on `RUST && MMU && NET && !ANDROID_BINDER_IPC`) - `CONFIG_ANDROID_BINDERFS` / `CONFIG_ANDROID_BINDER_DEVICES` 4. Focus Symbols Identification: - In Rust, `GenlMsg::put`, `put_u32`, `put_string` are generic / inlined helpers. - Netlink underlying C function: `nla_put` (in `lib/nlattr.c`). - Rust Binder entry points and caller functions exercising this reporting: - `rust_binder_new_context` - `nla_put` - Specific non-inline caller symbols or demangled Rust paths: `rust_binder_fops`, `rust_binder_open` --- ### POTENTIAL REASONING LOOPS / TOOL AVOIDANCE - No active loops detected. - Broad greps on common terms like `\bput_` were refined to target Rust Binder specific symbols. --- ### NEXT STEPS - Invoke `set-results` tool with: - `WorthFuzzing = true` - Relevant `FocusSymbols` (`rust_binder_new_context`, `nla_put`, etc.) - Relevant `EnableConfigs` (`RUST`, `NET`, `ANDROID_BINDER_IPC_RUST`, `ANDROID_BINDERFS`, etc.) Tokens: input: 46179 output: 1074 thoughts: 0
90/2	2026/09/27 08:01	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 21645 output: 26 thoughts: 0
91/2	2026/09/27 08:01	tool	grepper	0m Args: { "Expression": "nla_put", "PathPrefix": "rust/" } Results: { "Output": "rust/kernel/net/netlink.rs=86= fn put\u003cT\u003e(\u0026mut self, attrtype: c_int, value: \u0026T) -\u003e Result\n--\nrust/kernel/net/netlink.rs-102- // readable and initialized for its `size_of` bytes.\nrust/kernel/net/netlink.rs:103: to_result(unsafe { bindings::nla_put(skb, attrtype, len as c_int, ptr) })\nrust/kernel/net/netlink.rs-104- }\n--\nrust/kernel/net/netlink.rs=120= pub fn put_flag(\u0026mut self, attrtype: c_int) -\u003e Result {\n--\nrust/kernel/net/netlink.rs-123- // when the length is zero.\nrust/kernel/net/netlink.rs:124: to_result(unsafe { bindings::nla_put(skb, attrtype, 0, core::ptr::null()) })\nrust/kernel/net/netlink.rs-125- }\n" }
92/2	2026/09/27 08:01	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 21944 output: 25 thoughts: 0
93/2	2026/09/27 08:01	tool	grepper	0m Args: { "Expression": "config ANDROID_BINDER_IPC_RUST" } Results: { "Output": "drivers/android/Kconfig=4=config ANDROID_BINDER_IPC\n--\ndrivers/android/Kconfig-16-\ndrivers/android/Kconfig:17:config ANDROID_BINDER_IPC_RUST\ndrivers/android/Kconfig-18-\tbool \"Rust version of Android Binder IPC Driver\"\n" }
94/2	2026/09/27 08:01	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 22056 output: 33 thoughts: 0
95/2	2026/09/27 08:01	tool	read-file	0m Args: { "File": "drivers/android/Kconfig", "FirstLine": 15, "LineCount": 40 } Results: { "Contents": " 15:\t\t between said processes.\n 16:\t\n 17:\tconfig ANDROID_BINDER_IPC_RUST\n 18:\t\tbool \"Rust version of Android Binder IPC Driver\"\n 19:\t\tdepends on RUST \u0026\u0026 MMU \u0026\u0026 NET \u0026\u0026 !ANDROID_BINDER_IPC\n 20:\t\thelp\n 21:\t\t This enables the Rust implementation of the Binder driver.\n 22:\t\n 23:\t\t Binder is used in Android for both communication between processes,\n 24:\t\t and remote method invocation.\n 25:\t\n 26:\t\t This means one Android process can call a method/routine in another\n 27:\t\t Android process, using Binder to identify, invoke and pass arguments\n 28:\t\t between said processes.\n 29:\t\n 30:\tconfig ANDROID_BINDERFS\n 31:\t\tbool \"Android Binderfs filesystem\"\n 32:\t\tdepends on ANDROID_BINDER_IPC\n 33:\t\tdefault n\n 34:\t\thelp\n 35:\t\t Binderfs is a pseudo-filesystem for the Android Binder IPC driver\n 36:\t\t which can be mounted per-ipc namespace allowing to run multiple\n 37:\t\t instances of Android.\n 38:\t\t Each binderfs mount initially only contains a binder-control device.\n 39:\t\t It can be used to dynamically allocate new binder IPC devices via\n 40:\t\t ioctls.\n 41:\t\n 42:\tconfig ANDROID_BINDER_DEVICES\n 43:\t\tstring \"Android Binder devices\"\n 44:\t\tdepends on ANDROID_BINDER_IPC \|\| ANDROID_BINDER_IPC_RUST\n 45:\t\tdefault \"binder,hwbinder,vndbinder\"\n 46:\t\thelp\n 47:\t\t Default value for the binder.devices parameter.\n 48:\t\n 49:\t\t The binder.devices parameter is a comma-separated list of strings\n 50:\t\t that specifies the names of the binder device nodes that will be\n 51:\t\t created. Each binder device has its own context manager, and is\n 52:\t\t therefore logically separated from the other devices.\n 53:\t\n 54:\tconfig ANDROID_BINDER_ALLOC_KUNIT_TEST\n" }
96/2	2026/09/27 08:01	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 22657 output: 29 thoughts: 0
97/2	2026/09/27 08:01	tool	grepper	0m Args: { "Expression": "report_netlink", "PathPrefix": "drivers/android/binder" } Results: { "Output": "drivers/android/binder/thread.rs=1284= fn transaction(self: \u0026Arc\u003cSelf\u003e, cmd: u32, reader: \u0026mut UserSliceReader) -\u003e Result\u003c()\u003e {\n--\ndrivers/android/binder/thread.rs-1334- // useful in case the transaction failed with BR_TRANSACTION_PENDING_FROZEN.\ndrivers/android/binder/thread.rs:1335: info.report_netlink(BR_ONEWAY_SPAM_SUSPECT, \u0026self.process.ctx);\ndrivers/android/binder/thread.rs-1336- }\ndrivers/android/binder/thread.rs-1337- if info.reply != 0 {\ndrivers/android/binder/thread.rs:1338: info.report_netlink(info.reply, \u0026self.process.ctx);\ndrivers/android/binder/thread.rs-1339- }\n--\ndrivers/android/binder/transaction.rs=80= pub(crate) fn is_oneway(\u0026self) -\u003e bool {\n--\ndrivers/android/binder/transaction.rs-83-\ndrivers/android/binder/transaction.rs:84: pub(crate) fn report_netlink(\u0026self, reply: u32, ctx: \u0026crate::Context) {\ndrivers/android/binder/transaction.rs:85: if let Err(err) = self.report_netlink_inner(reply, ctx) {\ndrivers/android/binder/transaction.rs-86- pr_warn!(\n--\ndrivers/android/binder/transaction.rs-93-\ndrivers/android/binder/transaction.rs:94: fn report_netlink_inner(\u0026self, reply: u32, ctx: \u0026crate::Context) -\u003e kernel::error::Result {\ndrivers/android/binder/transaction.rs-95- if !Report::has_listeners() {\n" }
98/2	2026/09/27 08:01	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 23149 output: 36 thoughts: 0
99/2	2026/09/27 08:01	tool	read-file	0m Args: { "File": "drivers/android/binder/netlink.rs", "FirstLine": 1, "LineCount": 80 } Results: { "Contents": " 1:\t// SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)\n 2:\t/* Based on: Documentation/netlink/specs/binder.yaml /\n 3:\t\n 4:\t#![allow(unreachable_pub, clippy::wrong_self_convention)]\n 5:\tuse kernel::{\n 6:\t net::netlink::{\n 7:\t Family,\n 8:\t GenlMsg,\n 9:\t MulticastGroup,\n 10:\t NetlinkSkBuff, //\n 11:\t },\n 12:\t prelude::, //\n 13:\t};\n 14:\t\n 15:\tpub static BINDER_NL_FAMILY: Family = Family::const_new(\n 16:\t kernel::module::this_module::\u003ccrate::LocalModule\u003e(),\n 17:\t kernel::uapi::BINDER_FAMILY_NAME,\n 18:\t kernel::uapi::BINDER_FAMILY_VERSION,\n 19:\t \u0026BINDER_NL_FAMILY_MCGRPS,\n 20:\t);\n 21:\t\n 22:\tstatic BINDER_NL_FAMILY_MCGRPS: [MulticastGroup; 1] = [MulticastGroup::const_new(c\"report\")];\n 23:\t\n 24:\t/// A multicast event sent to userspace subscribers to notify them about\n 25:\t/// binder transaction failures. The generated report provides the full\n 26:\t/// details of the specific transaction that failed. The intention is for\n 27:\t/// programs to monitor these events and react to the failures as needed.\n 28:\tpub struct Report {\n 29:\t skb: GenlMsg,\n 30:\t}\n 31:\t\n 32:\timpl Report {\n 33:\t /// Create a new multicast message.\n 34:\t pub fn new(\n 35:\t size: usize,\n 36:\t portid: u32,\n 37:\t seq: u32,\n 38:\t flags: kernel::alloc::Flags,\n 39:\t ) -\u003e Result\u003cSelf, kernel::alloc::AllocError\u003e {\n 40:\t const BINDER_CMD_REPORT: u8 = kernel::uapi::BINDER_CMD_REPORT as u8;\n 41:\t let skb = NetlinkSkBuff::new(size, flags)?;\n 42:\t let skb = skb.genlmsg_put(portid, seq, \u0026BINDER_NL_FAMILY, BINDER_CMD_REPORT)?;\n 43:\t Ok(Self { skb })\n 44:\t }\n 45:\t\n 46:\t /// Broadcast this message.\n 47:\t pub fn multicast(self, portid: u32, flags: kernel::alloc::Flags) -\u003e Result {\n 48:\t self.skb.multicast(\u0026BINDER_NL_FAMILY, portid, 0, flags)\n 49:\t }\n 50:\t\n 51:\t /// Check if this message type has listeners.\n 52:\t pub fn has_listeners() -\u003e bool {\n 53:\t BINDER_NL_FAMILY.has_listeners(0)\n 54:\t }\n 55:\t\n 56:\t /// The enum binder_driver_return_protocol returned to the sender.\n 57:\t pub fn error(\u0026mut self, val: u32) -\u003e Result {\n 58:\t const BINDER_A_REPORT_ERROR: c_int = kernel::uapi::BINDER_A_REPORT_ERROR as c_int;\n 59:\t self.skb.put_u32(BINDER_A_REPORT_ERROR, val)\n 60:\t }\n 61:\t\n 62:\t /// The binder context where the transaction occurred.\n 63:\t pub fn context(\u0026mut self, val: \u0026CStr) -\u003e Result {\n 64:\t const BINDER_A_REPORT_CONTEXT: c_int = kernel::uapi::BINDER_A_REPORT_CONTEXT as c_int;\n 65:\t self.skb.put_string(BINDER_A_REPORT_CONTEXT, val)\n 66:\t }\n 67:\t\n 68:\t /// The PID of the sender process.\n 69:\t pub fn from_pid(\u0026mut self, val: u32) -\u003e Result {\n 70:\t const BINDER_A_REPORT_FROM_PID: c_int = kernel::uapi::BINDER_A_REPORT_FROM_PID as c_int;\n 71:\t self.skb.put_u32(BINDER_A_REPORT_FROM_PID, val)\n 72:\t }\n 73:\t\n 74:\t /// The TID of the sender thread.\n 75:\t pub fn from_tid(\u0026mut self, val: u32) -\u003e Result {\n 76:\t const BINDER_A_REPORT_FROM_TID: c_int = kernel::uapi::BINDER_A_REPORT_FROM_TID as c_int;\n 77:\t self.skb.put_u32(BINDER_A_REPORT_FROM_TID, val)\n 78:\t }\n 79:\t\n 80:\t /// The PID of the recipient process. This attribute may not be present\n" }
100/2	2026/09/27 08:01	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 24554 output: 37 thoughts: 0
101/2	2026/09/27 08:01	tool	read-file	0m Args: { "File": "rust/kernel/net/netlink.rs", "FirstLine": 85, "LineCount": 45 } Results: { "Contents": " 85:\t #[inline]\n 86:\t fn put\u003cT\u003e(\u0026mut self, attrtype: c_int, value: \u0026T) -\u003e Result\n 87:\t where\n 88:\t T: ?Sized + AsBytes,\n 89:\t {\n 90:\t // `nla_len` is a 16-bit field that encodes the total attribute length\n 91:\t // (header + payload). Subtracting the header size from `u16::MAX` gives\n 92:\t // the largest payload that still fits within that field.\n 93:\t const MAX_PAYLOAD_LEN: usize = u16_as_usize(u16::MAX) - size_of::\u003cbindings::nlattr\u003e();\n 94:\t\n 95:\t let skb = self.skb.skb.as_ptr();\n 96:\t let len = size_of_val(value);\n 97:\t let ptr = core::ptr::from_ref(value).cast::\u003cc_void\u003e();\n 98:\t if len \u003e MAX_PAYLOAD_LEN {\n 99:\t return Err(EMSGSIZE);\n 100:\t }\n 101:\t // SAFETY: `skb` is valid by `NetlinkSkBuff` type invariants, and the provided value is\n 102:\t // readable and initialized for its `size_of` bytes.\n 103:\t to_result(unsafe { bindings::nla_put(skb, attrtype, len as c_int, ptr) })\n 104:\t }\n 105:\t\n 106:\t /// Puts a `u32` attribute into the message.\n 107:\t #[inline]\n 108:\t pub fn put_u32(\u0026mut self, attrtype: c_int, value: u32) -\u003e Result {\n 109:\t self.put(attrtype, \u0026value)\n 110:\t }\n 111:\t\n 112:\t /// Puts a string attribute into the message.\n 113:\t #[inline]\n 114:\t pub fn put_string(\u0026mut self, attrtype: c_int, value: \u0026CStr) -\u003e Result {\n 115:\t self.put(attrtype, value.to_bytes_with_nul())\n 116:\t }\n 117:\t\n 118:\t /// Puts a flag attribute into the message.\n 119:\t #[inline]\n 120:\t pub fn put_flag(\u0026mut self, attrtype: c_int) -\u003e Result {\n 121:\t let skb = self.skb.skb.as_ptr();\n 122:\t // SAFETY: `skb` is valid by `NetlinkSkBuff` type invariants, and a null pointer is valid\n 123:\t // when the length is zero.\n 124:\t to_result(unsafe { bindings::nla_put(skb, attrtype, 0, core::ptr::null()) })\n 125:\t }\n 126:\t\n 127:\t /// Sends the generic netlink message as a multicast message.\n 128:\t #[inline]\n 129:\t pub fn multicast(\n" }
102/2	2026/09/27 08:01	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 25436 output: 28 thoughts: 0
103/2	2026/09/27 08:02	tool	grepper	0m Args: { "Expression": "rust_binder", "PathPrefix": "drivers/android/binder" } Results: { "Output": "drivers/android/binder/Makefile=2=ccflags-y += -I$(src)\t# needed for trace events\ndrivers/android/binder/Makefile-3-\ndrivers/android/binder/Makefile:4:obj-$(CONFIG_ANDROID_BINDER_IPC_RUST) += rust_binder.o\ndrivers/android/binder/Makefile:5:rust_binder-y := \\\ndrivers/android/binder/Makefile:6:\trust_binder_main.o\t\\\ndrivers/android/binder/Makefile:7:\trust_binderfs.o\t\t\\\ndrivers/android/binder/Makefile:8:\trust_binder_events.o\n--\ndrivers/android/binder/debug.rs=18= pub enum DebugMask {\n--\ndrivers/android/binder/debug.rs-37-#[no_mangle]\ndrivers/android/binder/debug.rs:38:pub(crate) static rust_binder_debug_mask: Atomic\u003cu32\u003e = Atomic::new(\ndrivers/android/binder/debug.rs-39- (DebugMask::UserError as u32)\n--\ndrivers/android/binder/debug.rs=45=pub(crate) fn debug_mask_enabled(mask: DebugMask) -\u003e bool {\ndrivers/android/binder/debug.rs:46: let current_mask = rust_binder_debug_mask.load(kernel::sync::atomic::Relaxed);\ndrivers/android/binder/debug.rs-47- DebugMasks(current_mask).contains(mask)\n--\ndrivers/android/binder/process.rs=1515= pub(crate) fn drop_outstanding_txn(\u0026self) {\n--\ndrivers/android/binder/process.rs-1532- // mangled symbol names.\ndrivers/android/binder/process.rs:1533: #[export_name = \"rust_binder_freeze\"]\ndrivers/android/binder/process.rs-1534- pub(crate) fn ioctl_freeze(\u0026self, info: \u0026BinderFreezeInfo) -\u003e Result {\n--\ndrivers/android/binder/rust_binder.h-12-/\ndrivers/android/binder/rust_binder.h:13: These symbols are exposed by `rust_binderfs.c` and exist here so that Rust\ndrivers/android/binder/rust_binder.h-14- * Binder can call them.\ndrivers/android/binder/rust_binder.h-15- /\ndrivers/android/binder/rust_binder.h:16:int init_rust_binderfs(void);\ndrivers/android/binder/rust_binder.h-17-\n--\ndrivers/android/binder/rust_binder.h=19=struct inode;\ndrivers/android/binder/rust_binder.h:20:struct dentry rust_binderfs_create_proc_file(struct inode nodp, int pid);\ndrivers/android/binder/rust_binder.h:21:void rust_binderfs_remove_file(struct dentry dentry);\ndrivers/android/binder/rust_binder.h-22-\n--\ndrivers/android/binder/rust_binder.h-27-\ndrivers/android/binder/rust_binder.h:28:typedef void rust_binder_transaction;\ndrivers/android/binder/rust_binder.h:29:typedef void rust_binder_process;\ndrivers/android/binder/rust_binder.h:30:typedef void rust_binder_node;\ndrivers/android/binder/rust_binder.h-31-\n--\ndrivers/android/binder/rust_binder.h=46=struct rb_node_layout {\n--\ndrivers/android/binder/rust_binder.h-51-\ndrivers/android/binder/rust_binder.h:52:struct rust_binder_layout {\ndrivers/android/binder/rust_binder.h-53-\tstruct rb_transaction_layout t;\n--\ndrivers/android/binder/rust_binder.h-57-\ndrivers/android/binder/rust_binder.h:58:extern const struct rust_binder_layout RUST_BINDER_LAYOUT;\ndrivers/android/binder/rust_binder.h-59-\ndrivers/android/binder/rust_binder.h:60:static inline size_t rust_binder_transaction_debug_id(rust_binder_transaction t)\ndrivers/android/binder/rust_binder.h-61-{\n--\ndrivers/android/binder/rust_binder.h-64-\ndrivers/android/binder/rust_binder.h:65:static inline u32 rust_binder_transaction_code(rust_binder_transaction t)\ndrivers/android/binder/rust_binder.h-66-{\n--\ndrivers/android/binder/rust_binder.h-69-\ndrivers/android/binder/rust_binder.h:70:static inline u32 rust_binder_transaction_flags(rust_binder_transaction t)\ndrivers/android/binder/rust_binder.h-71-{\n--\ndrivers/android/binder/rust_binder.h-75-// Nullable!\ndrivers/android/binder/rust_binder.h:76:static inline rust_binder_node rust_binder_transaction_target_node(rust_binder_transaction t)\ndrivers/android/binder/rust_binder.h-77-{\n--\ndrivers/android/binder/rust_binder.h-84-\ndrivers/android/binder/rust_binder.h:85:static inline rust_binder_process rust_binder_transaction_to_proc(rust_binder_transaction t)\ndrivers/android/binder/rust_binder.h-86-{\n--\ndrivers/android/binder/rust_binder.h-91-\ndrivers/android/binder/rust_binder.h:92:static inline struct task_struct rust_binder_process_task(rust_binder_process t)\ndrivers/android/binder/rust_binder.h-93-{\n--\ndrivers/android/binder/rust_binder.h-96-\ndrivers/android/binder/rust_binder.h:97:static inline size_t rust_binder_node_debug_id(rust_binder_node t)\ndrivers/android/binder/rust_binder.h-98-{\n--\ndrivers/android/binder/rust_binder.h-101-\ndrivers/android/binder/rust_binder.h:102:static inline binder_uintptr_t rust_binder_node_ptr(rust_binder_node t)\ndrivers/android/binder/rust_binder.h-103-{\n--\ndrivers/android/binder/rust_binder_events.c-1-// SPDX-License-Identifier: GPL-2.0-only\ndrivers/android/binder/rust_binder_events.c:2:/* rust_binder_events.c\ndrivers/android/binder/rust_binder_events.c-3- \n--\ndrivers/android/binder/rust_binder_events.c-8-\ndrivers/android/binder/rust_binder_events.c:9:#include \"rust_binder.h\"\ndrivers/android/binder/rust_binder_events.c-10-\n--\ndrivers/android/binder/rust_binder_events.c=36=const char const binder_return_strings[] = {\n--\ndrivers/android/binder/rust_binder_events.c-63-#define CREATE_RUST_TRACE_POINTS\ndrivers/android/binder/rust_binder_events.c:64:#include \"rust_binder_events.h\"\n--\ndrivers/android/binder/rust_binder_events.h-8-#undef TRACE_INCLUDE_PATH\ndrivers/android/binder/rust_binder_events.h:9:#define TRACE_SYSTEM rust_binder\ndrivers/android/binder/rust_binder_events.h:10:#define TRACE_INCLUDE_FILE rust_binder_events\ndrivers/android/binder/rust_binder_events.h-11-#define TRACE_INCLUDE_PATH ../drivers/android/binder\n--\ndrivers/android/binder/rust_binder_events.h=72=TRACE_EVENT(binder_transaction,\ndrivers/android/binder/rust_binder_events.h:73:\tTP_PROTO(bool reply, rust_binder_transaction t, struct task_struct thread),\ndrivers/android/binder/rust_binder_events.h-74-\tTP_ARGS(reply, t, thread),\n--\ndrivers/android/binder/rust_binder_events.h-84-\tTP_fast_assign(\ndrivers/android/binder/rust_binder_events.h:85:\t\trust_binder_process to = rust_binder_transaction_to_proc(t);\ndrivers/android/binder/rust_binder_events.h:86:\t\trust_binder_node target_node = rust_binder_transaction_target_node(t);\ndrivers/android/binder/rust_binder_events.h-87-\ndrivers/android/binder/rust_binder_events.h:88:\t\t__entry-\u003edebug_id = rust_binder_transaction_debug_id(t);\ndrivers/android/binder/rust_binder_events.h:89:\t\t__entry-\u003etarget_node = target_node ? rust_binder_node_debug_id(target_node) : 0;\ndrivers/android/binder/rust_binder_events.h:90:\t\t__entry-\u003eto_proc = rust_binder_process_task(to)-\u003epid;\ndrivers/android/binder/rust_binder_events.h-91-\t\t__entry-\u003eto_thread = thread ? thread-\u003epid : 0;\ndrivers/android/binder/rust_binder_events.h-92-\t\t__entry-\u003ereply = reply;\ndrivers/android/binder/rust_binder_events.h:93:\t\t__entry-\u003ecode = rust_binder_transaction_code(t);\ndrivers/android/binder/rust_binder_events.h:94:\t\t__entry-\u003eflags = rust_binder_transaction_flags(t);\ndrivers/android/binder/rust_binder_events.h-95-\t),\n--\ndrivers/android/binder/rust_binder_events.h=102=TRACE_EVENT(binder_transaction_received,\ndrivers/android/binder/rust_binder_events.h:103:\tTP_PROTO(rust_binder_transaction t),\ndrivers/android/binder/rust_binder_events.h-104-\tTP_ARGS(t),\n--\ndrivers/android/binder/rust_binder_events.h-108-\tTP_fast_assign(\ndrivers/android/binder/rust_binder_events.h:109:\t\t__entry-\u003edebug_id = rust_binder_transaction_debug_id(t);\ndrivers/android/binder/rust_binder_events.h-110-\t),\n--\ndrivers/android/binder/rust_binder_internal.h-1-/ SPDX-License-Identifier: GPL-2.0 /\ndrivers/android/binder/rust_binder_internal.h:2:/ rust_binder_internal.h\ndrivers/android/binder/rust_binder_internal.h-3- \n--\ndrivers/android/binder/rust_binder_internal.h-26- /\ndrivers/android/binder/rust_binder_internal.h:27:typedef void rust_binder_context;\ndrivers/android/binder/rust_binder_internal.h-28-\n--\ndrivers/android/binder/rust_binder_internal.h=39=struct binder_device {\ndrivers/android/binder/rust_binder_internal.h-40-\tint minor;\ndrivers/android/binder/rust_binder_internal.h:41:\trust_binder_context ctx;\ndrivers/android/binder/rust_binder_internal.h-42-};\ndrivers/android/binder/rust_binder_internal.h-43-\ndrivers/android/binder/rust_binder_internal.h:44:int rust_binder_stats_show(struct seq_file m, void unused);\ndrivers/android/binder/rust_binder_internal.h:45:int rust_binder_state_show(struct seq_file m, void unused);\ndrivers/android/binder/rust_binder_internal.h:46:int rust_binder_transactions_show(struct seq_file m, void unused);\ndrivers/android/binder/rust_binder_internal.h:47:int rust_binder_proc_show(struct seq_file m, void pid);\ndrivers/android/binder/rust_binder_internal.h-48-\ndrivers/android/binder/rust_binder_internal.h:49:extern const struct file_operations rust_binder_fops;\ndrivers/android/binder/rust_binder_internal.h:50:rust_binder_context rust_binder_new_context(char name);\ndrivers/android/binder/rust_binder_internal.h:51:void rust_binder_remove_context(rust_binder_context device);\ndrivers/android/binder/rust_binder_internal.h-52-\n--\ndrivers/android/binder/rust_binder_main.rs-6-\ndrivers/android/binder/rust_binder_main.rs:7:#![crate_name = \"rust_binder\"]\ndrivers/android/binder/rust_binder_main.rs-8-#![recursion_limit = \"256\"]\n--\ndrivers/android/binder/rust_binder_main.rs=49=mod binderfs {\n--\ndrivers/android/binder/rust_binder_main.rs-52- extern \"C\" {\ndrivers/android/binder/rust_binder_main.rs:53: pub fn init_rust_binderfs() -\u003e kernel::ffi::c_int;\ndrivers/android/binder/rust_binder_main.rs-54- }\ndrivers/android/binder/rust_binder_main.rs-55- extern \"C\" {\ndrivers/android/binder/rust_binder_main.rs:56: pub fn rust_binderfs_create_proc_file(\ndrivers/android/binder/rust_binder_main.rs-57- nodp: mut inode,\n--\ndrivers/android/binder/rust_binder_main.rs-61- extern \"C\" {\ndrivers/android/binder/rust_binder_main.rs:62: pub fn rust_binderfs_remove_file(dentry: mut dentry);\ndrivers/android/binder/rust_binder_main.rs-63- }\ndrivers/android/binder/rust_binder_main.rs:64: pub type rust_binder_context = mut kernel::ffi::c_void;\ndrivers/android/binder/rust_binder_main.rs-65- #[repr(C)]\n--\ndrivers/android/binder/rust_binder_main.rs=67= pub struct binder_device {\ndrivers/android/binder/rust_binder_main.rs-68- pub minor: kernel::ffi::c_int,\ndrivers/android/binder/rust_binder_main.rs:69: pub ctx: rust_binder_context,\ndrivers/android/binder/rust_binder_main.rs-70- }\n--\ndrivers/android/binder/rust_binder_main.rs=72= fn default() -\u003e Self {\n--\ndrivers/android/binder/rust_binder_main.rs-83- type: BinderModule,\ndrivers/android/binder/rust_binder_main.rs:84: name: \"rust_binder\",\ndrivers/android/binder/rust_binder_main.rs-85- authors: [\"Wedson Almeida Filho\", \"Alice Ryhl\"],\n--\ndrivers/android/binder/rust_binder_main.rs-89-\ndrivers/android/binder/rust_binder_main.rs:90:use kernel::bindings::rust_binder_layout;\ndrivers/android/binder/rust_binder_main.rs-91-#[no_mangle]\ndrivers/android/binder/rust_binder_main.rs:92:static RUST_BINDER_LAYOUT: rust_binder_layout = rust_binder_layout {\ndrivers/android/binder/rust_binder_main.rs-93- t: transaction::TRANSACTION_LAYOUT,\n--\ndrivers/android/binder/rust_binder_main.rs=304= fn init(_module: \u0026'static kernel::ThisModule) -\u003e Result\u003cSelf\u003e {\n--\ndrivers/android/binder/rust_binder_main.rs-311- // SAFETY: The module is being loaded, so we can initialize binderfs.\ndrivers/android/binder/rust_binder_main.rs:312: unsafe { kernel::error::to_result(binderfs::init_rust_binderfs())? };\ndrivers/android/binder/rust_binder_main.rs-313-\n--\ndrivers/android/binder/rust_binder_main.rs=322=unsafe impl\u003cT\u003e Sync for AssertSync\u003cT\u003e {}\ndrivers/android/binder/rust_binder_main.rs-323-\ndrivers/android/binder/rust_binder_main.rs:324:/// File operations that rust_binderfs.c can use.\ndrivers/android/binder/rust_binder_main.rs-325-#[no_mangle]\ndrivers/android/binder/rust_binder_main.rs-326-#[used]\ndrivers/android/binder/rust_binder_main.rs:327:pub static rust_binder_fops: AssertSync\u003ckernel::bindings::file_operations\u003e = {\ndrivers/android/binder/rust_binder_main.rs-328- let ops = kernel::bindings::file_operations {\ndrivers/android/binder/rust_binder_main.rs-329- owner: this_module::\u003cLocalModule\u003e().as_ptr(),\ndrivers/android/binder/rust_binder_main.rs:330: poll: Some(rust_binder_poll),\ndrivers/android/binder/rust_binder_main.rs:331: unlocked_ioctl: Some(rust_binder_ioctl),\ndrivers/android/binder/rust_binder_main.rs-332- compat_ioctl: bindings::compat_ptr_ioctl,\ndrivers/android/binder/rust_binder_main.rs:333: mmap: Some(rust_binder_mmap),\ndrivers/android/binder/rust_binder_main.rs:334: open: Some(rust_binder_open),\ndrivers/android/binder/rust_binder_main.rs:335: release: Some(rust_binder_release),\ndrivers/android/binder/rust_binder_main.rs:336: flush: Some(rust_binder_flush),\ndrivers/android/binder/rust_binder_main.rs-337- ..pin_init::zeroed()\n--\ndrivers/android/binder/rust_binder_main.rs-344-#[no_mangle]\ndrivers/android/binder/rust_binder_main.rs:345:unsafe extern \"C\" fn rust_binder_new_context(\ndrivers/android/binder/rust_binder_main.rs-346- name: const kernel::ffi::c_char,\n--\ndrivers/android/binder/rust_binder_main.rs-358-#[no_mangle]\ndrivers/android/binder/rust_binder_main.rs:359:unsafe extern \"C\" fn rust_binder_remove_context(device: mut kernel::ffi::c_void) {\ndrivers/android/binder/rust_binder_main.rs-360- if !device.is_null() {\ndrivers/android/binder/rust_binder_main.rs-361- // SAFETY: The caller ensures that the `device` pointer came from a previous call to\ndrivers/android/binder/rust_binder_main.rs:362: // `rust_binder_new_device`.\ndrivers/android/binder/rust_binder_main.rs-363- let ctx = unsafe { Arc::\u003cContext\u003e::from_foreign(device) };\n--\ndrivers/android/binder/rust_binder_main.rs-370-/// Only called by binderfs.\ndrivers/android/binder/rust_binder_main.rs:371:unsafe extern \"C\" fn rust_binder_open(\ndrivers/android/binder/rust_binder_main.rs-372- inode: mut bindings::inode,\n--\ndrivers/android/binder/rust_binder_main.rs-374-) -\u003e kernel::ffi::c_int {\ndrivers/android/binder/rust_binder_main.rs:375: // SAFETY: The `rust_binderfs.c` file ensures that `i_private` is set to a\ndrivers/android/binder/rust_binder_main.rs-376- // `struct binder_device`.\n--\ndrivers/android/binder/rust_binder_main.rs-380-\ndrivers/android/binder/rust_binder_main.rs:381: // SAFETY: The `rust_binderfs.c` file ensures that `device-\u003ectx` holds a binder context when\ndrivers/android/binder/rust_binder_main.rs-382- // using the rust binder fops.\n--\ndrivers/android/binder/rust_binder_main.rs-405-/// Only called by binderfs.\ndrivers/android/binder/rust_binder_main.rs:406:unsafe extern \"C\" fn rust_binder_release(\ndrivers/android/binder/rust_binder_main.rs-407- _inode: mut bindings::inode,\n--\ndrivers/android/binder/rust_binder_main.rs-409-) -\u003e kernel::ffi::c_int {\ndrivers/android/binder/rust_binder_main.rs:410: // SAFETY: We previously set `private_data` in `rust_binder_open`.\ndrivers/android/binder/rust_binder_main.rs-411- let process = unsafe { Arc::\u003cProcess\u003e::from_foreign((file).private_data) };\n--\ndrivers/android/binder/rust_binder_main.rs-419-/// Only called by binderfs.\ndrivers/android/binder/rust_binder_main.rs:420:unsafe extern \"C\" fn rust_binder_ioctl(\ndrivers/android/binder/rust_binder_main.rs-421- file: mut bindings::file,\n--\ndrivers/android/binder/rust_binder_main.rs-424-) -\u003e kernel::ffi::c_long {\ndrivers/android/binder/rust_binder_main.rs:425: // SAFETY: We previously set `private_data` in `rust_binder_open`.\ndrivers/android/binder/rust_binder_main.rs-426- let f = unsafe { Arc::\u003cProcess\u003e::borrow((file).private_data) };\n--\ndrivers/android/binder/rust_binder_main.rs-435-/// Only called by binderfs.\ndrivers/android/binder/rust_binder_main.rs:436:unsafe extern \"C\" fn rust_binder_mmap(\ndrivers/android/binder/rust_binder_main.rs-437- file: mut bindings::file,\n--\ndrivers/android/binder/rust_binder_main.rs-439-) -\u003e kernel::ffi::c_int {\ndrivers/android/binder/rust_binder_main.rs:440: // SAFETY: We previously set `private_data` in `rust_binder_open`.\ndrivers/android/binder/rust_binder_main.rs-441- let f = unsafe { Arc::\u003cProcess\u003e::borrow((file).private_data) };\n--\ndrivers/android/binder/rust_binder_main.rs-452-/// Only called by binderfs.\ndrivers/android/binder/rust_binder_main.rs:453:unsafe extern \"C\" fn rust_binder_poll(\ndrivers/android/binder/rust_binder_main.rs-454- file: mut bindings::file,\n--\ndrivers/android/binder/rust_binder_main.rs-456-) -\u003e bindings::__poll_t {\ndrivers/android/binder/rust_binder_main.rs:457: // SAFETY: We previously set `private_data` in `rust_binder_open`.\ndrivers/android/binder/rust_binder_main.rs-458- let f = unsafe { Arc::\u003cProcess\u003e::borrow((file).private_data) };\n--\ndrivers/android/binder/rust_binder_main.rs-469-/// Only called by binderfs.\ndrivers/android/binder/rust_binder_main.rs:470:unsafe extern \"C\" fn rust_binder_flush(\ndrivers/android/binder/rust_binder_main.rs-471- file: mut bindings::file,\n--\ndrivers/android/binder/rust_binder_main.rs-473-) -\u003e kernel::ffi::c_int {\ndrivers/android/binder/rust_binder_main.rs:474: // SAFETY: We previously set `private_data` in `rust_binder_open`.\ndrivers/android/binder/rust_binder_main.rs-475- let f = unsafe { Arc::\u003cProcess\u003e::borrow((file).private_data) };\n--\ndrivers/android/binder/rust_binder_main.rs-484-#[no_mangle]\ndrivers/android/binder/rust_binder_main.rs:485:unsafe extern \"C\" fn rust_binder_stats_show(\ndrivers/android/binder/rust_binder_main.rs-486- ptr: mut seq_file,\n--\ndrivers/android/binder/rust_binder_main.rs-491- let m = unsafe { SeqFile::from_raw(ptr) };\ndrivers/android/binder/rust_binder_main.rs:492: if let Err(err) = rust_binder_stats_show_impl(m) {\ndrivers/android/binder/rust_binder_main.rs-493- seq_print!(m, \"failed to generate state: {:?}\\n\", err);\n--\ndrivers/android/binder/rust_binder_main.rs-500-#[no_mangle]\ndrivers/android/binder/rust_binder_main.rs:501:unsafe extern \"C\" fn rust_binder_state_show(\ndrivers/android/binder/rust_binder_main.rs-502- ptr: mut seq_file,\n--\ndrivers/android/binder/rust_binder_main.rs-507- let m = unsafe { SeqFile::from_raw(ptr) };\ndrivers/android/binder/rust_binder_main.rs:508: if let Err(err) = rust_binder_state_show_impl(m) {\ndrivers/android/binder/rust_binder_main.rs-509- seq_print!(m, \"failed to generate state: {:?}\\n\", err);\n--\ndrivers/android/binder/rust_binder_main.rs-516-#[no_mangle]\ndrivers/android/binder/rust_binder_main.rs:517:unsafe extern \"C\" fn rust_binder_proc_show(\ndrivers/android/binder/rust_binder_main.rs-518- ptr: mut seq_file,\n--\ndrivers/android/binder/rust_binder_main.rs-525- let m = unsafe { SeqFile::from_raw(ptr) };\ndrivers/android/binder/rust_binder_main.rs:526: if let Err(err) = rust_binder_proc_show_impl(m, pid) {\ndrivers/android/binder/rust_binder_main.rs-527- seq_print!(m, \"failed to generate state: {:?}\\n\", err);\n--\ndrivers/android/binder/rust_binder_main.rs-534-#[no_mangle]\ndrivers/android/binder/rust_binder_main.rs:535:unsafe extern \"C\" fn rust_binder_transactions_show(\ndrivers/android/binder/rust_binder_main.rs-536- ptr: mut seq_file,\n--\ndrivers/android/binder/rust_binder_main.rs-541- let m = unsafe { SeqFile::from_raw(ptr) };\ndrivers/android/binder/rust_binder_main.rs:542: if let Err(err) = rust_binder_transactions_show_impl(m) {\ndrivers/android/binder/rust_binder_main.rs-543- seq_print!(m, \"failed to generate state: {:?}\\n\", err);\n--\ndrivers/android/binder/rust_binder_main.rs-547-\ndrivers/android/binder/rust_binder_main.rs:548:fn rust_binder_transactions_show_impl(m: \u0026SeqFile) -\u003e Result\u003c()\u003e {\ndrivers/android/binder/rust_binder_main.rs-549- seq_print!(m, \"binder transactions:\\n\");\n--\ndrivers/android/binder/rust_binder_main.rs-560-\ndrivers/android/binder/rust_binder_main.rs:561:fn rust_binder_stats_show_impl(m: \u0026SeqFile) -\u003e Result\u003c()\u003e {\ndrivers/android/binder/rust_binder_main.rs-562- seq_print!(m, \"binder stats:\\n\");\n--\ndrivers/android/binder/rust_binder_main.rs-574-\ndrivers/android/binder/rust_binder_main.rs:575:fn rust_binder_state_show_impl(m: \u0026SeqFile) -\u003e Result\u003c()\u003e {\ndrivers/android/binder/rust_binder_main.rs-576- seq_print!(m, \"binder state:\\n\");\n--\ndrivers/android/binder/rust_binder_main.rs-587-\ndrivers/android/binder/rust_binder_main.rs:588:fn rust_binder_proc_show_impl(m: \u0026SeqFile, pid: Pid) -\u003e Result\u003c()\u003e {\ndrivers/android/binder/rust_binder_main.rs-589- seq_print!(m, \"binder proc state:\\n\");\n--\ndrivers/android/binder/rust_binder_main.rs=610= unsafe fn new(nodp: mut bindings::inode, pid: i32) -\u003e Result\u003cOption\u003cSelf\u003e\u003e {\ndrivers/android/binder/rust_binder_main.rs-611- // SAFETY: The caller passes an `inode` for a newly created binder file.\ndrivers/android/binder/rust_binder_main.rs:612: let dentry = unsafe { binderfs::rust_binderfs_create_proc_file(nodp, pid) };\ndrivers/android/binder/rust_binder_main.rs-613- match kernel::error::from_err_ptr(dentry) {\n--\ndrivers/android/binder/rust_binder_main.rs=622= fn drop(\u0026mut self) {\ndrivers/android/binder/rust_binder_main.rs:623: // SAFETY: This is a dentry from `rust_binderfs_remove_file` that has not been deleted yet.\ndrivers/android/binder/rust_binder_main.rs:624: unsafe { binderfs::rust_binderfs_remove_file(self.0.as_ptr()) };\ndrivers/android/binder/rust_binder_main.rs-625- }\n--\ndrivers/android/binder/rust_binderfs.c-35-\ndrivers/android/binder/rust_binderfs.c:36:#include \"rust_binder.h\"\ndrivers/android/binder/rust_binderfs.c:37:#include \"rust_binder_internal.h\"\ndrivers/android/binder/rust_binderfs.c-38-\n--\ndrivers/android/binder/rust_binderfs.c-45-\ndrivers/android/binder/rust_binderfs.c:46:DEFINE_SHOW_ATTRIBUTE(rust_binder_stats);\ndrivers/android/binder/rust_binderfs.c:47:DEFINE_SHOW_ATTRIBUTE(rust_binder_state);\ndrivers/android/binder/rust_binderfs.c:48:DEFINE_SHOW_ATTRIBUTE(rust_binder_transactions);\ndrivers/android/binder/rust_binderfs.c:49:DEFINE_SHOW_ATTRIBUTE(rust_binder_proc);\ndrivers/android/binder/rust_binderfs.c-50-\ndrivers/android/binder/rust_binderfs.c:51:char rust_binder_devices_param = CONFIG_ANDROID_BINDER_DEVICES;\ndrivers/android/binder/rust_binderfs.c:52:module_param_named(rust_devices, rust_binder_devices_param, charp, 0444);\ndrivers/android/binder/rust_binderfs.c-53-\ndrivers/android/binder/rust_binderfs.c:54:extern u32 rust_binder_debug_mask;\ndrivers/android/binder/rust_binderfs.c:55:module_param_named(debug_mask, rust_binder_debug_mask, uint, 0644);\ndrivers/android/binder/rust_binderfs.c-56-\n--\ndrivers/android/binder/rust_binderfs.c=117=static int binderfs_binder_device_create(struct inode ref_inode,\n--\ndrivers/android/binder/rust_binderfs.c-123-\tstruct binder_device device = NULL;\ndrivers/android/binder/rust_binderfs.c:124:\trust_binder_context ctx = NULL;\ndrivers/android/binder/rust_binderfs.c-125-\tstruct inode inode = NULL;\n--\ndrivers/android/binder/rust_binderfs.c-156-\ndrivers/android/binder/rust_binderfs.c:157:\tctx = rust_binder_new_context(req-\u003ename);\ndrivers/android/binder/rust_binderfs.c-158-\tif (!ctx)\n--\ndrivers/android/binder/rust_binderfs.c-168-\t\t\t MKDEV(MAJOR(binderfs_dev), minor));\ndrivers/android/binder/rust_binderfs.c:169:\tinode-\u003ei_fop = \u0026rust_binder_fops;\ndrivers/android/binder/rust_binderfs.c-170-\tinode-\u003ei_uid = info-\u003eroot_uid;\n--\ndrivers/android/binder/rust_binderfs.c-199-\tkfree(device);\ndrivers/android/binder/rust_binderfs.c:200:\trust_binder_remove_context(ctx);\ndrivers/android/binder/rust_binderfs.c-201-\tmutex_lock(\u0026binderfs_minors_mutex);\n--\ndrivers/android/binder/rust_binderfs.c=245=static void binderfs_evict_inode(struct inode inode)\n--\ndrivers/android/binder/rust_binderfs.c-260-\t/* ctx is null for binder-control, but this function ignores null pointers /\ndrivers/android/binder/rust_binderfs.c:261:\trust_binder_remove_context(device-\u003ectx);\ndrivers/android/binder/rust_binderfs.c-262-\n--\ndrivers/android/binder/rust_binderfs.c=449=static struct inode binderfs_make_inode(struct super_block sb, int mode)\n--\ndrivers/android/binder/rust_binderfs.c-461-\ndrivers/android/binder/rust_binderfs.c:462:void rust_binderfs_remove_file(struct dentry dentry)\ndrivers/android/binder/rust_binderfs.c-463-{\n--\ndrivers/android/binder/rust_binderfs.c-466-\ndrivers/android/binder/rust_binderfs.c:467:static struct dentry rust_binderfs_create_file(struct dentry parent, const char name,\ndrivers/android/binder/rust_binderfs.c-468-\t\t\t\t\t\tconst struct file_operations fops,\n--\ndrivers/android/binder/rust_binderfs.c-491-\ndrivers/android/binder/rust_binderfs.c:492:struct dentry rust_binderfs_create_proc_file(struct inode nodp, int pid)\ndrivers/android/binder/rust_binderfs.c-493-{\n--\ndrivers/android/binder/rust_binderfs.c-502-\tsnprintf(strbuf, sizeof(strbuf), \"%u\", pid);\ndrivers/android/binder/rust_binderfs.c:503:\treturn rust_binderfs_create_file(dir, strbuf, \u0026rust_binder_proc_fops, data);\ndrivers/android/binder/rust_binderfs.c-504-}\n--\ndrivers/android/binder/rust_binderfs.c=543=static int init_binder_features(struct super_block sb)\n--\ndrivers/android/binder/rust_binderfs.c-550-\ndrivers/android/binder/rust_binderfs.c:551:\tdentry = rust_binderfs_create_file(dir, \"oneway_spam_detection\",\ndrivers/android/binder/rust_binderfs.c-552-\t\t\t\t \u0026binder_features_fops,\n--\ndrivers/android/binder/rust_binderfs.c-556-\ndrivers/android/binder/rust_binderfs.c:557:\tdentry = rust_binderfs_create_file(dir, \"extended_error\",\ndrivers/android/binder/rust_binderfs.c-558-\t\t\t\t \u0026binder_features_fops,\n--\ndrivers/android/binder/rust_binderfs.c-562-\ndrivers/android/binder/rust_binderfs.c:563:\tdentry = rust_binderfs_create_file(dir, \"freeze_notification\",\ndrivers/android/binder/rust_binderfs.c-564-\t\t\t\t \u0026binder_features_fops,\n--\ndrivers/android/binder/rust_binderfs.c=572=static int init_binder_logs(struct super_block sb)\n--\ndrivers/android/binder/rust_binderfs.c-584-\ndrivers/android/binder/rust_binderfs.c:585:\tdentry = rust_binderfs_create_file(binder_logs_root_dir, \"stats\",\ndrivers/android/binder/rust_binderfs.c:586:\t\t\t\t \u0026rust_binder_stats_fops, NULL);\ndrivers/android/binder/rust_binderfs.c-587-\tif (IS_ERR(dentry)) {\n--\ndrivers/android/binder/rust_binderfs.c-591-\ndrivers/android/binder/rust_binderfs.c:592:\tdentry = rust_binderfs_create_file(binder_logs_root_dir, \"state\",\ndrivers/android/binder/rust_binderfs.c:593:\t\t\t\t \u0026rust_binder_state_fops, NULL);\ndrivers/android/binder/rust_binderfs.c-594-\tif (IS_ERR(dentry)) {\n--\ndrivers/android/binder/rust_binderfs.c-598-\ndrivers/android/binder/rust_binderfs.c:599:\tdentry = rust_binderfs_create_file(binder_logs_root_dir, \"transactions\",\ndrivers/android/binder/rust_binderfs.c:600:\t\t\t\t \u0026rust_binder_transactions_fops, NULL);\ndrivers/android/binder/rust_binderfs.c-601-\tif (IS_ERR(dentry)) {\n--\ndrivers/android/binder/rust_binderfs.c=618=static int binderfs_fill_super(struct super_block sb, struct fs_context fc)\n--\ndrivers/android/binder/rust_binderfs.c-682-\ndrivers/android/binder/rust_binderfs.c:683:\tname = rust_binder_devices_param;\ndrivers/android/binder/rust_binderfs.c-684-\tfor (len = strcspn(name, \",\"); len \u003e 0; len = strcspn(name, \",\")) {\n--\ndrivers/android/binder/rust_binderfs.c=756=static struct file_system_type binder_fs_type = {\n--\ndrivers/android/binder/rust_binderfs.c-763-\ndrivers/android/binder/rust_binderfs.c:764:int init_rust_binderfs(void)\ndrivers/android/binder/rust_binderfs.c-765-{\n--\ndrivers/android/binder/rust_binderfs.c-770-\t/* Verify that the default binderfs device names are valid. /\ndrivers/android/binder/rust_binderfs.c:771:\tname = rust_binder_devices_param;\ndrivers/android/binder/rust_binderfs.c-772-\tfor (len = strcspn(name, \",\"); len \u003e 0; len = strcspn(name, \",\")) {\n--\ndrivers/android/binder/rust_binderfs.c-781-\tret = alloc_chrdev_region(\u0026binderfs_dev, 0, BINDERFS_MAX_MINOR,\ndrivers/android/binder/rust_binderfs.c:782:\t\t\t\t \"rust_binder\");\ndrivers/android/binder/rust_binderfs.c-783-\tif (ret)\n--\ndrivers/android/binder/thread.rs=535= pub(crate) fn has_current_transaction(\u0026self) -\u003e bool {\n--\ndrivers/android/binder/thread.rs-543- // mangled symbol names.\ndrivers/android/binder/thread.rs:544: #[export_name = \"rust_binder_waitlcl\"]\ndrivers/android/binder/thread.rs-545- fn get_work_local(self: \u0026Arc\u003cSelf\u003e, wait: bool) -\u003e Result\u003cOption\u003cDLArc\u003cdyn DeliverToRead\u003e\u003e\u003e {\n--\ndrivers/android/binder/thread.rs-584- // mangled symbol names.\ndrivers/android/binder/thread.rs:585: #[export_name = \"rust_binder_wait\"]\ndrivers/android/binder/thread.rs-586- fn get_work(self: \u0026Arc\u003cSelf\u003e, wait: bool) -\u003e Result\u003cOption\u003cDLArc\u003cdyn DeliverToRead\u003e\u003e\u003e {\n--\ndrivers/android/binder/trace.rs-8-\ndrivers/android/binder/trace.rs:9:use kernel::bindings::{rust_binder_transaction, task_struct};\ndrivers/android/binder/trace.rs-10-use kernel::error::Result;\n--\ndrivers/android/binder/trace.rs-20- unsafe fn binder_wait_for_work(proc_work: bool, transaction_stack: bool, thread_todo: bool);\ndrivers/android/binder/trace.rs:21: unsafe fn binder_transaction(reply: bool, t: rust_binder_transaction, thread: mut task_struct);\ndrivers/android/binder/trace.rs:22: unsafe fn binder_transaction_received(t: rust_binder_transaction);\ndrivers/android/binder/trace.rs-23- unsafe fn binder_transaction_fd_send(t_debug_id: c_int, fd: c_int, offset: usize);\n--\ndrivers/android/binder/trace.rs-29-#[inline]\ndrivers/android/binder/trace.rs:30:fn raw_transaction(t: \u0026Transaction) -\u003e rust_binder_transaction {\ndrivers/android/binder/trace.rs-31- ptr::from_ref(t).cast_mut().cast()\n" }
104/2	2026/09/27 08:02	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 36009 output: 33 thoughts: 1608 Thoughts: Analysis of the Netlink Patch: Fuzzing Recommendation Okay, let's break this down. We have a patch that introduces a runtime validation check within the `GenlMsg::put` function in `rust/kernel/net/netlink.rs`. Specifically, it checks if the length of the data being put into a Netlink attribute exceeds `MAX_PAYLOAD_LEN`, returning an error (`EMSGSIZE`) if it does. This kind of runtime assertion immediately triggers my internal alarm bells, and I need to assess the fuzzing implications. First, I need to confirm whether this code path is reachable. Given the instructions, and my experience, this is a key question. Fortunately, I already know that `rust/kernel/net/netlink.rs` is part of the Rust Generic Netlink API, and its use by the Rust Binder (`CONFIG_ANDROID_BINDER_IPC_RUST`) is of particular interest. The Binder code generates generic netlink multicast notifications upon transaction failures via functions like `report_netlink`. The code flow from there goes from `context`, `error`, `from_pid` down to a call to `GenlMsg::put` via intermediate functions like `put_string` and `put_u32`. This establishes reachability and indicates the code must be fuzzed. Now, let's consider the FocusSymbols. I need to select targets that will focus the fuzzer on the changed logic without including ubiquitous or unrelated functions. Section 4 reminds me not to include calls to functions that are used almost everywhere. My initial thought was `GenlMsg::put` or even the underlying C function `nla_put` within `lib/nlattr.c`. However, I need to think this through. `nla_put` is part of core Netlink functionality, which is heavily used, however, it's not used by every syscall, so it can be listed. Given this addition is targeted at Netlink message formatting, targeting `nla_put` seems appropriate. Furthermore, let's explore Rust Binder entry points. We can look at `rust_binder_ioctl` (within `rust_binder_fops`), `rust_binder_open`, and `rust_binder_new_context` as targets. It seems we also have the entrypoints with the `#[export_name]` directives. Given these considerations, I recommend fuzzing.
105/2	2026/09/27 08:02	tool	grepper	0m Args: { "Expression": "^int nla_put\\(", "PathPrefix": "lib/nlattr.c" } Results: { "Output": "lib/nlattr.c=1082=EXPORT_SYMBOL(__nla_put_nohdr);\n--\nlib/nlattr.c-1093- /\nlib/nlattr.c:1094:int nla_put(struct sk_buff skb, int attrtype, int attrlen, const void *data)\nlib/nlattr.c-1095-{\n" }
106/2	2026/09/27 08:02	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 38270 output: 36 thoughts: 105 Thoughts: Investigating the `nla_put` Symbol in the Rust Binder Implementation Okay, so `nla_put` is an exported symbol, specifically residing within `lib/nlattr.c`. My initial thought is to trace its usage, and given the context, the logical next step is to examine `rust_binder_ioctl`. Let's dive into the `drivers/android/binder/rust_binder_main.rs` file. Ah, yes, `rust_binder_ioctl` is defined as a `#[no_mangle] unsafe extern "C" fn`. This hints at a deliberate interaction with the C ABI, as expected. Now, I need to understand the scope of this `no_mangle` usage. I want to see if any other functions are also marked this way within the Rust Binder code. I'll need to check `rust_binder_main.rs`, of course, but also likely `thread.rs` and `transaction.rs` – these are the likely candidates for interaction with the kernel-level code. Understanding the complete set of `no_mangle` functions will provide a clearer picture of the boundary between Rust and C code in this binder implementation.
107/2	2026/09/27 08:02	tool	grepper	0m Args: { "Expression": "#\\[(no_mangle\|export_name)", "PathPrefix": "drivers/android/binder" } Results: { "Output": "drivers/android/binder/debug.rs=18= pub enum DebugMask {\n--\ndrivers/android/binder/debug.rs-36-\ndrivers/android/binder/debug.rs:37:#[no_mangle]\ndrivers/android/binder/debug.rs-38-pub(crate) static rust_binder_debug_mask: Atomic\u003cu32\u003e = Atomic::new(\n--\ndrivers/android/binder/page_range.rs=622= fn drop(self: Pin\u003c\u0026mut Self\u003e) {\n--\ndrivers/android/binder/page_range.rs-659-/// Called by the shrinker.\ndrivers/android/binder/page_range.rs:660:#[no_mangle]\ndrivers/android/binder/page_range.rs-661-unsafe extern \"C\" fn rust_shrink_count(\n--\ndrivers/android/binder/page_range.rs-672-/// Called by the shrinker.\ndrivers/android/binder/page_range.rs:673:#[no_mangle]\ndrivers/android/binder/page_range.rs-674-unsafe extern \"C\" fn rust_shrink_scan(\n--\ndrivers/android/binder/page_range.rs-697-/// Called by the shrinker.\ndrivers/android/binder/page_range.rs:698:#[no_mangle]\ndrivers/android/binder/page_range.rs-699-unsafe extern \"C\" fn rust_shrink_free_page(\n--\ndrivers/android/binder/process.rs=1515= pub(crate) fn drop_outstanding_txn(\u0026self) {\n--\ndrivers/android/binder/process.rs-1530-\ndrivers/android/binder/process.rs:1531: // #[export_name] is a temporary workaround so that ps output does not become unreadable from\ndrivers/android/binder/process.rs-1532- // mangled symbol names.\ndrivers/android/binder/process.rs:1533: #[export_name = \"rust_binder_freeze\"]\ndrivers/android/binder/process.rs-1534- pub(crate) fn ioctl_freeze(\u0026self, info: \u0026BinderFreezeInfo) -\u003e Result {\n--\ndrivers/android/binder/rust_binder_main.rs=72= fn default() -\u003e Self {\n--\ndrivers/android/binder/rust_binder_main.rs-90-use kernel::bindings::rust_binder_layout;\ndrivers/android/binder/rust_binder_main.rs:91:#[no_mangle]\ndrivers/android/binder/rust_binder_main.rs-92-static RUST_BINDER_LAYOUT: rust_binder_layout = rust_binder_layout {\n--\ndrivers/android/binder/rust_binder_main.rs=322=unsafe impl\u003cT\u003e Sync for AssertSync\u003cT\u003e {}\n--\ndrivers/android/binder/rust_binder_main.rs-324-/// File operations that rust_binderfs.c can use.\ndrivers/android/binder/rust_binder_main.rs:325:#[no_mangle]\ndrivers/android/binder/rust_binder_main.rs-326-#[used]\n--\ndrivers/android/binder/rust_binder_main.rs-343-/// Only called by binderfs.\ndrivers/android/binder/rust_binder_main.rs:344:#[no_mangle]\ndrivers/android/binder/rust_binder_main.rs-345-unsafe extern \"C\" fn rust_binder_new_context(\n--\ndrivers/android/binder/rust_binder_main.rs-357-/// Only called by binderfs.\ndrivers/android/binder/rust_binder_main.rs:358:#[no_mangle]\ndrivers/android/binder/rust_binder_main.rs-359-unsafe extern \"C\" fn rust_binder_remove_context(device: *mut kernel::ffi::c_void) {\n--\ndrivers/android/binder/rust_binder_main.rs-483-/// Only called by binderfs.\ndrivers/android/binder/rust_binder_main.rs:484:#[no_mangle]\ndrivers/android/binder/rust_binder_main.rs-485-unsafe extern \"C\" fn rust_binder_stats_show(\n--\ndrivers/android/binder/rust_binder_main.rs-499-/// Only called by binderfs.\ndrivers/android/binder/rust_binder_main.rs:500:#[no_mangle]\ndrivers/android/binder/rust_binder_main.rs-501-unsafe extern \"C\" fn rust_binder_state_show(\n--\ndrivers/android/binder/rust_binder_main.rs-515-/// Only called by binderfs.\ndrivers/android/binder/rust_binder_main.rs:516:#[no_mangle]\ndrivers/android/binder/rust_binder_main.rs-517-unsafe extern \"C\" fn rust_binder_proc_show(\n--\ndrivers/android/binder/rust_binder_main.rs-533-/// Only called by binderfs.\ndrivers/android/binder/rust_binder_main.rs:534:#[no_mangle]\ndrivers/android/binder/rust_binder_main.rs-535-unsafe extern \"C\" fn rust_binder_transactions_show(\n--\ndrivers/android/binder/thread.rs=535= pub(crate) fn has_current_transaction(\u0026self) -\u003e bool {\n--\ndrivers/android/binder/thread.rs-541- /// signal); otherwise it returns indicating that none is available.\ndrivers/android/binder/thread.rs:542: // #[export_name] is a temporary workaround so that ps output does not become unreadable from\ndrivers/android/binder/thread.rs-543- // mangled symbol names.\ndrivers/android/binder/thread.rs:544: #[export_name = \"rust_binder_waitlcl\"]\ndrivers/android/binder/thread.rs-545- fn get_work_local(self: \u0026Arc\u003cSelf\u003e, wait: bool) -\u003e Result\u003cOption\u003cDLArc\u003cdyn DeliverToRead\u003e\u003e\u003e {\n--\ndrivers/android/binder/thread.rs-582- /// is, the local version (`get_work_local`) should be used instead.\ndrivers/android/binder/thread.rs:583: // #[export_name] is a temporary workaround so that ps output does not become unreadable from\ndrivers/android/binder/thread.rs-584- // mangled symbol names.\ndrivers/android/binder/thread.rs:585: #[export_name = \"rust_binder_wait\"]\ndrivers/android/binder/thread.rs-586- fn get_work(self: \u0026Arc\u003cSelf\u003e, wait: bool) -\u003e Result\u003cOption\u003cDLArc\u003cdyn DeliverToRead\u003e\u003e\u003e {\n" }
108/2	2026/09/27 08:02	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 40336 output: 41 thoughts: 149 Thoughts: Okay, let's see. My first thought is to compare `rust_binder_ioctl` with some other related symbols to get a clearer picture. I'll need to do a broader check. Now, looking specifically at `rust_binder_main.rs`, I see: ```rust unsafe extern "C" fn rust_binder_ioctl( file: *mut bindings::file, cmd: kernel::ffi::c_uint, arg: kernel::ffi::c_ulong, ) -> kernel::ffi::c_long ``` Aha! This is a non-mangled `extern "C"` function. That's interesting, and somewhat unusual. I'm slightly surprised... Wait a minute, I'm pretty sure I didn't see a `#[no_mangle]` attribute applied to `rust_binder_ioctl`! That's unexpected. This could have some implications. I should verify that. Let me quickly scan line 420 of `rust_binder_main.rs`.
109/2	2026/09/27 08:02	tool	read-file	0m Args: { "File": "drivers/android/binder/rust_binder_main.rs", "FirstLine": 415, "LineCount": 20 } Results: { "Contents": " 415:\t 0\n 416:\t}\n 417:\t\n 418:\t/// # Safety\n 419:\t/// Only called by binderfs.\n 420:\tunsafe extern \"C\" fn rust_binder_ioctl(\n 421:\t file: mut bindings::file,\n 422:\t cmd: kernel::ffi::c_uint,\n 423:\t arg: kernel::ffi::c_ulong,\n 424:\t) -\u003e kernel::ffi::c_long {\n 425:\t // SAFETY: We previously set `private_data` in `rust_binder_open`.\n 426:\t let f = unsafe { Arc::\u003cProcess\u003e::borrow((file).private_data) };\n 427:\t // SAFETY: The caller ensures that the file is valid.\n 428:\t match Process::ioctl(f, unsafe { File::from_raw_file(file) }, cmd, arg) {\n 429:\t Ok(()) =\u003e 0,\n 430:\t Err(err) =\u003e err.to_errno() as isize,\n 431:\t }\n 432:\t}\n 433:\t\n 434:\t/// # Safety\n" }
110/2	2026/09/27 08:02	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 41075 output: 28 thoughts: 294 Thoughts: My Current Analysis of the Rust Binder Implementation Okay, so I'm digging into this Rust-based binder implementation and immediately hit a potential snag. I was looking at `unsafe extern "C" fn rust_binder_ioctl` and realized that, without `#[no_mangle]` (or `#[export_name]`, for that matter), that symbol will be mangled by the Rust compiler. That could be a real problem when interfacing with C code, assuming the C code expects the raw symbol name! Hmm, but wait...looking at `rust_binder_new_context`, it does have `#[no_mangle]`: ```rust #[no_mangle] unsafe extern "C" fn rust_binder_new_context( name: const kernel::ffi::c_char, ) -> rust_binder_context ``` Good. And, I see that `rust_binder_fops` also has `#[no_mangle]`: ```rust #[no_mangle] #[used] pub static rust_binder_fops: AssertSync<kernel::bindings::file_operations> ``` Okay, so those entry points are explicitly handled. That's a relief. Next, I am looking at `rust_binderfs.c` and remember I'm dealing with C code, so the function definitions are important. Okay, `binderfs_binder_device_create` is definitely* a C function, as is `binderfs_fill_super`. And, of course, functions like `nla_put` are from external libraries. Now, I'm trying to map out how this all fits together. What C functions in `rust_binderfs.c` are actually entry points or entry points for other functions? I see a connection. `binderfs_binder_device_create` is the crucial piece; I'm betting that's called when userspace does an ioctl `BINDER_CTL_ADD` on `/dev/binder-control`! I need to trace this user space interaction to better see the flow. Time to see how userspace interacts with binder and binderfs!
111/2	2026/09/27 08:02	tool	grepper	0m Args: { "Expression": "binderfs_", "PathPrefix": "drivers/android/binder" } Results: { "Output": "drivers/android/binder/process.rs=116=pub(crate) struct ProcessInner {\n--\ndrivers/android/binder/process.rs-145- pub(crate) async_recv: bool,\ndrivers/android/binder/process.rs:146: pub(crate) binderfs_file: Option\u003cBinderfsProcFile\u003e,\ndrivers/android/binder/process.rs-147- /// Check for oneway spam\n--\ndrivers/android/binder/process.rs=152= fn new() -\u003e Self {\n--\ndrivers/android/binder/process.rs-169- async_recv: false,\ndrivers/android/binder/process.rs:170: binderfs_file: None,\ndrivers/android/binder/process.rs-171- oneway_spam_detection_enabled: false,\n--\ndrivers/android/binder/process.rs=1404= fn deferred_release(self: Arc\u003cSelf\u003e) {\n--\ndrivers/android/binder/process.rs-1421-\ndrivers/android/binder/process.rs:1422: let binderfs_file = self.inner.lock().binderfs_file.take();\ndrivers/android/binder/process.rs:1423: drop(binderfs_file);\ndrivers/android/binder/process.rs-1424-\n--\ndrivers/android/binder/process.rs=1718= pub(crate) fn release(this: Arc\u003cProcess\u003e, _file: \u0026File) {\ndrivers/android/binder/process.rs:1719: let binderfs_file;\ndrivers/android/binder/process.rs-1720- let should_schedule;\n--\ndrivers/android/binder/process.rs-1724- inner.defer_work \|= DeferWork::Release;\ndrivers/android/binder/process.rs:1725: binderfs_file = inner.binderfs_file.take();\ndrivers/android/binder/process.rs-1726- }\n--\ndrivers/android/binder/process.rs-1733-\ndrivers/android/binder/process.rs:1734: drop(binderfs_file);\ndrivers/android/binder/process.rs-1735- }\n--\ndrivers/android/binder/rust_binder.h=19=struct inode;\ndrivers/android/binder/rust_binder.h:20:struct dentry rust_binderfs_create_proc_file(struct inode nodp, int pid);\ndrivers/android/binder/rust_binder.h:21:void rust_binderfs_remove_file(struct dentry dentry);\ndrivers/android/binder/rust_binder.h-22-\n--\ndrivers/android/binder/rust_binder_internal.h=27=typedef void rust_binder_context;\n--\ndrivers/android/binder/rust_binder_internal.h-35- * files in the binder_logs subdirectory. This struct owns a refcount on `ctx`\ndrivers/android/binder/rust_binder_internal.h:36: * and the entry for `minor` in `binderfs_minors`. For binder-control `ctx` is\ndrivers/android/binder/rust_binder_internal.h-37- * null.\n--\ndrivers/android/binder/rust_binder_internal.h=51=void rust_binder_remove_context(rust_binder_context device);\n--\ndrivers/android/binder/rust_binder_internal.h-53-/*\ndrivers/android/binder/rust_binder_internal.h:54: binderfs_mount_opts - mount options for binderfs\ndrivers/android/binder/rust_binder_internal.h-55- * @max: maximum number of allocatable binderfs binder devices\n--\ndrivers/android/binder/rust_binder_internal.h-57- /\ndrivers/android/binder/rust_binder_internal.h:58:struct binderfs_mount_opts {\ndrivers/android/binder/rust_binder_internal.h-59-\tint max;\n--\ndrivers/android/binder/rust_binder_internal.h-63-/\ndrivers/android/binder/rust_binder_internal.h:64: binderfs_info - information about a binderfs mount\ndrivers/android/binder/rust_binder_internal.h-65- * @ipc_ns: The ipc namespace the binderfs mount belongs to.\n--\ndrivers/android/binder/rust_binder_internal.h-76- /\ndrivers/android/binder/rust_binder_internal.h:77:struct binderfs_info {\ndrivers/android/binder/rust_binder_internal.h-78-\tstruct ipc_namespace ipc_ns;\n--\ndrivers/android/binder/rust_binder_internal.h-81-\tkgid_t root_gid;\ndrivers/android/binder/rust_binder_internal.h:82:\tstruct binderfs_mount_opts mount_opts;\ndrivers/android/binder/rust_binder_internal.h-83-\tint device_count;\n--\ndrivers/android/binder/rust_binder_main.rs=49=mod binderfs {\n--\ndrivers/android/binder/rust_binder_main.rs-55- extern \"C\" {\ndrivers/android/binder/rust_binder_main.rs:56: pub fn rust_binderfs_create_proc_file(\ndrivers/android/binder/rust_binder_main.rs-57- nodp: mut inode,\n--\ndrivers/android/binder/rust_binder_main.rs-61- extern \"C\" {\ndrivers/android/binder/rust_binder_main.rs:62: pub fn rust_binderfs_remove_file(dentry: mut dentry);\ndrivers/android/binder/rust_binder_main.rs-63- }\n--\ndrivers/android/binder/rust_binder_main.rs=322=unsafe impl\u003cT\u003e Sync for AssertSync\u003cT\u003e {}\n--\ndrivers/android/binder/rust_binder_main.rs-393- match unsafe { BinderfsProcFile::new(inode, process.task.pid()) } {\ndrivers/android/binder/rust_binder_main.rs:394: Ok(Some(file)) =\u003e process.inner.lock().binderfs_file = Some(file),\ndrivers/android/binder/rust_binder_main.rs-395- Ok(None) =\u003e { /* pid already exists / }\n--\ndrivers/android/binder/rust_binder_main.rs=610= unsafe fn new(nodp: mut bindings::inode, pid: i32) -\u003e Result\u003cOption\u003cSelf\u003e\u003e {\ndrivers/android/binder/rust_binder_main.rs-611- // SAFETY: The caller passes an `inode` for a newly created binder file.\ndrivers/android/binder/rust_binder_main.rs:612: let dentry = unsafe { binderfs::rust_binderfs_create_proc_file(nodp, pid) };\ndrivers/android/binder/rust_binder_main.rs-613- match kernel::error::from_err_ptr(dentry) {\n--\ndrivers/android/binder/rust_binder_main.rs=622= fn drop(\u0026mut self) {\ndrivers/android/binder/rust_binder_main.rs:623: // SAFETY: This is a dentry from `rust_binderfs_remove_file` that has not been deleted yet.\ndrivers/android/binder/rust_binder_main.rs:624: unsafe { binderfs::rust_binderfs_remove_file(self.0.as_ptr()) };\ndrivers/android/binder/rust_binder_main.rs-625- }\n--\ndrivers/android/binder/rust_binderfs.c=55=module_param_named(debug_mask, rust_binder_debug_mask, uint, 0644);\ndrivers/android/binder/rust_binderfs.c-56-\ndrivers/android/binder/rust_binderfs.c:57:static dev_t binderfs_dev;\ndrivers/android/binder/rust_binderfs.c:58:static DEFINE_MUTEX(binderfs_minors_mutex);\ndrivers/android/binder/rust_binderfs.c:59:static DEFINE_IDA(binderfs_minors);\ndrivers/android/binder/rust_binderfs.c-60-\ndrivers/android/binder/rust_binderfs.c:61:enum binderfs_param {\ndrivers/android/binder/rust_binderfs.c-62-\tOpt_max,\n--\ndrivers/android/binder/rust_binderfs.c-65-\ndrivers/android/binder/rust_binderfs.c:66:enum binderfs_stats_mode {\ndrivers/android/binder/rust_binderfs.c:67:\tbinderfs_stats_mode_unset,\ndrivers/android/binder/rust_binderfs.c:68:\tbinderfs_stats_mode_global,\ndrivers/android/binder/rust_binderfs.c-69-};\n--\ndrivers/android/binder/rust_binderfs.c=71=struct binder_features {\n--\ndrivers/android/binder/rust_binderfs.c-76-\ndrivers/android/binder/rust_binderfs.c:77:static const struct constant_table binderfs_param_stats[] = {\ndrivers/android/binder/rust_binderfs.c:78:\t{ \"global\", binderfs_stats_mode_global },\ndrivers/android/binder/rust_binderfs.c-79-\t{}\n--\ndrivers/android/binder/rust_binderfs.c-81-\ndrivers/android/binder/rust_binderfs.c:82:static const struct fs_parameter_spec binderfs_fs_parameters[] = {\ndrivers/android/binder/rust_binderfs.c-83-\tfsparam_u32(\"max\",\tOpt_max),\ndrivers/android/binder/rust_binderfs.c:84:\tfsparam_enum(\"stats\",\tOpt_stats_mode, binderfs_param_stats),\ndrivers/android/binder/rust_binderfs.c-85-\t{}\n--\ndrivers/android/binder/rust_binderfs.c=88=static struct binder_features binder_features = {\n--\ndrivers/android/binder/rust_binderfs.c-93-\ndrivers/android/binder/rust_binderfs.c:94:static inline struct binderfs_info BINDERFS_SB(const struct super_block sb)\ndrivers/android/binder/rust_binderfs.c-95-{\n--\ndrivers/android/binder/rust_binderfs.c-99-/*\ndrivers/android/binder/rust_binderfs.c:100: binderfs_binder_device_create - allocate inode from super block of a\ndrivers/android/binder/rust_binderfs.c-101- * binderfs mount\n--\ndrivers/android/binder/rust_binderfs.c-103- * @userp: buffer to copy information about new device for userspace to\ndrivers/android/binder/rust_binderfs.c:104: * @req: struct binderfs_device as copied from userspace\ndrivers/android/binder/rust_binderfs.c-105- \n--\ndrivers/android/binder/rust_binderfs.c-107- number for it.\ndrivers/android/binder/rust_binderfs.c:108: * Minor numbers are limited and tracked globally in binderfs_minors. The\ndrivers/android/binder/rust_binderfs.c-109- * function will stash a struct binder_device for the specific binder\n--\ndrivers/android/binder/rust_binderfs.c-116- /\ndrivers/android/binder/rust_binderfs.c:117:static int binderfs_binder_device_create(struct inode ref_inode,\ndrivers/android/binder/rust_binderfs.c:118:\t\t\t\t\t struct binderfs_device __user userp,\ndrivers/android/binder/rust_binderfs.c:119:\t\t\t\t\t struct binderfs_device req)\ndrivers/android/binder/rust_binderfs.c-120-{\n--\ndrivers/android/binder/rust_binderfs.c-126-\tstruct super_block sb = ref_inode-\u003ei_sb;\ndrivers/android/binder/rust_binderfs.c:127:\tstruct binderfs_info info = sb-\u003es_fs_info;\ndrivers/android/binder/rust_binderfs.c-128-#if defined(CONFIG_IPC_NS)\n--\ndrivers/android/binder/rust_binderfs.c-134-\t/* Reserve new minor number for the new device. /\ndrivers/android/binder/rust_binderfs.c:135:\tmutex_lock(\u0026binderfs_minors_mutex);\ndrivers/android/binder/rust_binderfs.c-136-\tif (++info-\u003edevice_count \u003c= info-\u003emount_opts.max)\ndrivers/android/binder/rust_binderfs.c:137:\t\tminor = ida_alloc_max(\u0026binderfs_minors,\ndrivers/android/binder/rust_binderfs.c-138-\t\t\t\t use_reserve ? BINDERFS_MAX_MINOR - 1 :\n--\ndrivers/android/binder/rust_binderfs.c-144-\t\t--info-\u003edevice_count;\ndrivers/android/binder/rust_binderfs.c:145:\t\tmutex_unlock(\u0026binderfs_minors_mutex);\ndrivers/android/binder/rust_binderfs.c-146-\t\treturn minor;\ndrivers/android/binder/rust_binderfs.c-147-\t}\ndrivers/android/binder/rust_binderfs.c:148:\tmutex_unlock(\u0026binderfs_minors_mutex);\ndrivers/android/binder/rust_binderfs.c-149-\n--\ndrivers/android/binder/rust_binderfs.c-167-\tinit_special_inode(inode, S_IFCHR \| 0600,\ndrivers/android/binder/rust_binderfs.c:168:\t\t\t MKDEV(MAJOR(binderfs_dev), minor));\ndrivers/android/binder/rust_binderfs.c-169-\tinode-\u003ei_fop = \u0026rust_binder_fops;\n--\ndrivers/android/binder/rust_binderfs.c-172-\ndrivers/android/binder/rust_binderfs.c:173:\treq-\u003emajor = MAJOR(binderfs_dev);\ndrivers/android/binder/rust_binderfs.c-174-\treq-\u003eminor = minor;\n--\ndrivers/android/binder/rust_binderfs.c-200-\trust_binder_remove_context(ctx);\ndrivers/android/binder/rust_binderfs.c:201:\tmutex_lock(\u0026binderfs_minors_mutex);\ndrivers/android/binder/rust_binderfs.c-202-\t--info-\u003edevice_count;\ndrivers/android/binder/rust_binderfs.c:203:\tida_free(\u0026binderfs_minors, minor);\ndrivers/android/binder/rust_binderfs.c:204:\tmutex_unlock(\u0026binderfs_minors_mutex);\ndrivers/android/binder/rust_binderfs.c-205-\tiput(inode);\n--\ndrivers/android/binder/rust_binderfs.c=220=static long binder_ctl_ioctl(struct file file, unsigned int cmd,\n--\ndrivers/android/binder/rust_binderfs.c-224-\tstruct inode inode = file_inode(file);\ndrivers/android/binder/rust_binderfs.c:225:\tstruct binderfs_device __user device = (struct binderfs_device __user )arg;\ndrivers/android/binder/rust_binderfs.c:226:\tstruct binderfs_device device_req;\ndrivers/android/binder/rust_binderfs.c-227-\n--\ndrivers/android/binder/rust_binderfs.c-235-\ndrivers/android/binder/rust_binderfs.c:236:\t\tret = binderfs_binder_device_create(inode, device, \u0026device_req);\ndrivers/android/binder/rust_binderfs.c-237-\t\tbreak;\n--\ndrivers/android/binder/rust_binderfs.c-244-\ndrivers/android/binder/rust_binderfs.c:245:static void binderfs_evict_inode(struct inode inode)\ndrivers/android/binder/rust_binderfs.c-246-{\ndrivers/android/binder/rust_binderfs.c-247-\tstruct binder_device device = inode-\u003ei_private;\ndrivers/android/binder/rust_binderfs.c:248:\tstruct binderfs_info info = BINDERFS_SB(inode-\u003ei_sb);\ndrivers/android/binder/rust_binderfs.c-249-\n--\ndrivers/android/binder/rust_binderfs.c-254-\ndrivers/android/binder/rust_binderfs.c:255:\tmutex_lock(\u0026binderfs_minors_mutex);\ndrivers/android/binder/rust_binderfs.c-256-\t--info-\u003edevice_count;\ndrivers/android/binder/rust_binderfs.c:257:\tida_free(\u0026binderfs_minors, device-\u003eminor);\ndrivers/android/binder/rust_binderfs.c:258:\tmutex_unlock(\u0026binderfs_minors_mutex);\ndrivers/android/binder/rust_binderfs.c-259-\n--\ndrivers/android/binder/rust_binderfs.c-265-\ndrivers/android/binder/rust_binderfs.c:266:static int binderfs_fs_context_parse_param(struct fs_context fc,\ndrivers/android/binder/rust_binderfs.c-267-\t\t\t\t\t struct fs_parameter param)\n--\ndrivers/android/binder/rust_binderfs.c-269-\tint opt;\ndrivers/android/binder/rust_binderfs.c:270:\tstruct binderfs_mount_opts ctx = fc-\u003efs_private;\ndrivers/android/binder/rust_binderfs.c-271-\tstruct fs_parse_result result;\ndrivers/android/binder/rust_binderfs.c-272-\ndrivers/android/binder/rust_binderfs.c:273:\topt = fs_parse(fc, binderfs_fs_parameters, param, \u0026result);\ndrivers/android/binder/rust_binderfs.c-274-\tif (opt \u003c 0)\n--\ndrivers/android/binder/rust_binderfs.c-296-\ndrivers/android/binder/rust_binderfs.c:297:static int binderfs_fs_context_reconfigure(struct fs_context fc)\ndrivers/android/binder/rust_binderfs.c-298-{\ndrivers/android/binder/rust_binderfs.c:299:\tstruct binderfs_mount_opts ctx = fc-\u003efs_private;\ndrivers/android/binder/rust_binderfs.c:300:\tstruct binderfs_info info = BINDERFS_SB(fc-\u003eroot-\u003ed_sb);\ndrivers/android/binder/rust_binderfs.c-301-\n--\ndrivers/android/binder/rust_binderfs.c-309-\ndrivers/android/binder/rust_binderfs.c:310:static int binderfs_show_options(struct seq_file seq, struct dentry root)\ndrivers/android/binder/rust_binderfs.c-311-{\ndrivers/android/binder/rust_binderfs.c:312:\tstruct binderfs_info info = BINDERFS_SB(root-\u003ed_sb);\ndrivers/android/binder/rust_binderfs.c-313-\n--\ndrivers/android/binder/rust_binderfs.c-317-\tswitch (info-\u003emount_opts.stats_mode) {\ndrivers/android/binder/rust_binderfs.c:318:\tcase binderfs_stats_mode_unset:\ndrivers/android/binder/rust_binderfs.c-319-\t\tbreak;\ndrivers/android/binder/rust_binderfs.c:320:\tcase binderfs_stats_mode_global:\ndrivers/android/binder/rust_binderfs.c-321-\t\tseq_puts(seq, \",stats=global\");\n--\ndrivers/android/binder/rust_binderfs.c-327-\ndrivers/android/binder/rust_binderfs.c:328:static const struct super_operations binderfs_super_ops = {\ndrivers/android/binder/rust_binderfs.c:329:\t.evict_inode = binderfs_evict_inode,\ndrivers/android/binder/rust_binderfs.c:330:\t.show_options\t= binderfs_show_options,\ndrivers/android/binder/rust_binderfs.c-331-\t.statfs = simple_statfs,\n--\ndrivers/android/binder/rust_binderfs.c-333-\ndrivers/android/binder/rust_binderfs.c:334:static inline bool is_binderfs_control_device(const struct dentry dentry)\ndrivers/android/binder/rust_binderfs.c-335-{\ndrivers/android/binder/rust_binderfs.c:336:\tstruct binderfs_info info = dentry-\u003ed_sb-\u003es_fs_info;\ndrivers/android/binder/rust_binderfs.c-337-\n--\ndrivers/android/binder/rust_binderfs.c-340-\ndrivers/android/binder/rust_binderfs.c:341:static int binderfs_rename(struct mnt_idmap idmap,\ndrivers/android/binder/rust_binderfs.c-342-\t\t\t struct inode old_dir, struct dentry old_dentry,\n--\ndrivers/android/binder/rust_binderfs.c-345-{\ndrivers/android/binder/rust_binderfs.c:346:\tif (is_binderfs_control_device(old_dentry) \|\|\ndrivers/android/binder/rust_binderfs.c:347:\t is_binderfs_control_device(new_dentry))\ndrivers/android/binder/rust_binderfs.c-348-\t\treturn -EPERM;\n--\ndrivers/android/binder/rust_binderfs.c-353-\ndrivers/android/binder/rust_binderfs.c:354:static int binderfs_unlink(struct inode dir, struct dentry dentry)\ndrivers/android/binder/rust_binderfs.c-355-{\ndrivers/android/binder/rust_binderfs.c:356:\tif (is_binderfs_control_device(dentry))\ndrivers/android/binder/rust_binderfs.c-357-\t\treturn -EPERM;\n--\ndrivers/android/binder/rust_binderfs.c=362=static const struct file_operations binder_ctl_fops = {\n--\ndrivers/android/binder/rust_binderfs.c-370-/*\ndrivers/android/binder/rust_binderfs.c:371: binderfs_binder_ctl_create - create a new binder-control device\ndrivers/android/binder/rust_binderfs.c-372- * @sb: super block of the binderfs mount\n--\ndrivers/android/binder/rust_binderfs.c-378- /\ndrivers/android/binder/rust_binderfs.c:379:static int binderfs_binder_ctl_create(struct super_block sb)\ndrivers/android/binder/rust_binderfs.c-380-{\n--\ndrivers/android/binder/rust_binderfs.c-385-\tstruct dentry root = sb-\u003es_root;\ndrivers/android/binder/rust_binderfs.c:386:\tstruct binderfs_info info = sb-\u003es_fs_info;\ndrivers/android/binder/rust_binderfs.c-387-#if defined(CONFIG_IPC_NS)\n--\ndrivers/android/binder/rust_binderfs.c-402-\t/* Reserve a new minor number for the new device. /\ndrivers/android/binder/rust_binderfs.c:403:\tmutex_lock(\u0026binderfs_minors_mutex);\ndrivers/android/binder/rust_binderfs.c:404:\tminor = ida_alloc_max(\u0026binderfs_minors,\ndrivers/android/binder/rust_binderfs.c-405-\t\t\t use_reserve ? BINDERFS_MAX_MINOR - 1 :\n--\ndrivers/android/binder/rust_binderfs.c-407-\t\t\t GFP_KERNEL);\ndrivers/android/binder/rust_binderfs.c:408:\tmutex_unlock(\u0026binderfs_minors_mutex);\ndrivers/android/binder/rust_binderfs.c-409-\tif (minor \u003c 0) {\n--\ndrivers/android/binder/rust_binderfs.c-416-\tinit_special_inode(inode, S_IFCHR \| 0600,\ndrivers/android/binder/rust_binderfs.c:417:\t\t\t MKDEV(MAJOR(binderfs_dev), minor));\ndrivers/android/binder/rust_binderfs.c-418-\tinode-\u003ei_fop = \u0026binder_ctl_fops;\n--\ndrivers/android/binder/rust_binderfs.c-442-\ndrivers/android/binder/rust_binderfs.c:443:static const struct inode_operations binderfs_dir_inode_operations = {\ndrivers/android/binder/rust_binderfs.c-444-\t.lookup = simple_lookup,\ndrivers/android/binder/rust_binderfs.c:445:\t.rename = binderfs_rename,\ndrivers/android/binder/rust_binderfs.c:446:\t.unlink = binderfs_unlink,\ndrivers/android/binder/rust_binderfs.c-447-};\ndrivers/android/binder/rust_binderfs.c-448-\ndrivers/android/binder/rust_binderfs.c:449:static struct inode binderfs_make_inode(struct super_block sb, int mode)\ndrivers/android/binder/rust_binderfs.c-450-{\n--\ndrivers/android/binder/rust_binderfs.c-461-\ndrivers/android/binder/rust_binderfs.c:462:void rust_binderfs_remove_file(struct dentry dentry)\ndrivers/android/binder/rust_binderfs.c-463-{\n--\ndrivers/android/binder/rust_binderfs.c-466-\ndrivers/android/binder/rust_binderfs.c:467:static struct dentry rust_binderfs_create_file(struct dentry parent, const char name,\ndrivers/android/binder/rust_binderfs.c-468-\t\t\t\t\t\tconst struct file_operations fops,\n--\ndrivers/android/binder/rust_binderfs.c-473-\ndrivers/android/binder/rust_binderfs.c:474:\tnew_inode = binderfs_make_inode(parent-\u003ed_sb, S_IFREG \| 0444);\ndrivers/android/binder/rust_binderfs.c-475-\tif (!new_inode)\n--\ndrivers/android/binder/rust_binderfs.c-491-\ndrivers/android/binder/rust_binderfs.c:492:struct dentry rust_binderfs_create_proc_file(struct inode nodp, int pid)\ndrivers/android/binder/rust_binderfs.c-493-{\ndrivers/android/binder/rust_binderfs.c:494:\tstruct binderfs_info info = nodp-\u003ei_sb-\u003es_fs_info;\ndrivers/android/binder/rust_binderfs.c-495-\tstruct dentry dir = info-\u003eproc_log_dir;\n--\ndrivers/android/binder/rust_binderfs.c-502-\tsnprintf(strbuf, sizeof(strbuf), \"%u\", pid);\ndrivers/android/binder/rust_binderfs.c:503:\treturn rust_binderfs_create_file(dir, strbuf, \u0026rust_binder_proc_fops, data);\ndrivers/android/binder/rust_binderfs.c-504-}\ndrivers/android/binder/rust_binderfs.c-505-\ndrivers/android/binder/rust_binderfs.c:506:static struct dentry binderfs_create_dir(struct dentry parent,\ndrivers/android/binder/rust_binderfs.c-507-\t\t\t\t\t const char name)\n--\ndrivers/android/binder/rust_binderfs.c-511-\ndrivers/android/binder/rust_binderfs.c:512:\tnew_inode = binderfs_make_inode(parent-\u003ed_sb, S_IFDIR \| 0755);\ndrivers/android/binder/rust_binderfs.c-513-\tif (!new_inode)\n--\ndrivers/android/binder/rust_binderfs.c=543=static int init_binder_features(struct super_block sb)\n--\ndrivers/android/binder/rust_binderfs.c-546-\ndrivers/android/binder/rust_binderfs.c:547:\tdir = binderfs_create_dir(sb-\u003es_root, \"features\");\ndrivers/android/binder/rust_binderfs.c-548-\tif (IS_ERR(dir))\n--\ndrivers/android/binder/rust_binderfs.c-550-\ndrivers/android/binder/rust_binderfs.c:551:\tdentry = rust_binderfs_create_file(dir, \"oneway_spam_detection\",\ndrivers/android/binder/rust_binderfs.c-552-\t\t\t\t \u0026binder_features_fops,\n--\ndrivers/android/binder/rust_binderfs.c-556-\ndrivers/android/binder/rust_binderfs.c:557:\tdentry = rust_binderfs_create_file(dir, \"extended_error\",\ndrivers/android/binder/rust_binderfs.c-558-\t\t\t\t \u0026binder_features_fops,\n--\ndrivers/android/binder/rust_binderfs.c-562-\ndrivers/android/binder/rust_binderfs.c:563:\tdentry = rust_binderfs_create_file(dir, \"freeze_notification\",\ndrivers/android/binder/rust_binderfs.c-564-\t\t\t\t \u0026binder_features_fops,\n--\ndrivers/android/binder/rust_binderfs.c=572=static int init_binder_logs(struct super_block sb)\n--\ndrivers/android/binder/rust_binderfs.c-574-\tstruct dentry binder_logs_root_dir, dentry, proc_log_dir;\ndrivers/android/binder/rust_binderfs.c:575:\tstruct binderfs_info info;\ndrivers/android/binder/rust_binderfs.c-576-\tint ret = 0;\ndrivers/android/binder/rust_binderfs.c-577-\ndrivers/android/binder/rust_binderfs.c:578:\tbinder_logs_root_dir = binderfs_create_dir(sb-\u003es_root,\ndrivers/android/binder/rust_binderfs.c-579-\t\t\t\t\t\t \"binder_logs\");\n--\ndrivers/android/binder/rust_binderfs.c-584-\ndrivers/android/binder/rust_binderfs.c:585:\tdentry = rust_binderfs_create_file(binder_logs_root_dir, \"stats\",\ndrivers/android/binder/rust_binderfs.c-586-\t\t\t\t \u0026rust_binder_stats_fops, NULL);\n--\ndrivers/android/binder/rust_binderfs.c-591-\ndrivers/android/binder/rust_binderfs.c:592:\tdentry = rust_binderfs_create_file(binder_logs_root_dir, \"state\",\ndrivers/android/binder/rust_binderfs.c-593-\t\t\t\t \u0026rust_binder_state_fops, NULL);\n--\ndrivers/android/binder/rust_binderfs.c-598-\ndrivers/android/binder/rust_binderfs.c:599:\tdentry = rust_binderfs_create_file(binder_logs_root_dir, \"transactions\",\ndrivers/android/binder/rust_binderfs.c-600-\t\t\t\t \u0026rust_binder_transactions_fops, NULL);\n--\ndrivers/android/binder/rust_binderfs.c-605-\ndrivers/android/binder/rust_binderfs.c:606:\tproc_log_dir = binderfs_create_dir(binder_logs_root_dir, \"proc\");\ndrivers/android/binder/rust_binderfs.c-607-\tif (IS_ERR(proc_log_dir)) {\n--\ndrivers/android/binder/rust_binderfs.c-617-\ndrivers/android/binder/rust_binderfs.c:618:static int binderfs_fill_super(struct super_block sb, struct fs_context fc)\ndrivers/android/binder/rust_binderfs.c-619-{\ndrivers/android/binder/rust_binderfs.c-620-\tint ret;\ndrivers/android/binder/rust_binderfs.c:621:\tstruct binderfs_info info;\ndrivers/android/binder/rust_binderfs.c:622:\tstruct binderfs_mount_opts ctx = fc-\u003efs_private;\ndrivers/android/binder/rust_binderfs.c-623-\tstruct inode inode = NULL;\ndrivers/android/binder/rust_binderfs.c:624:\tstruct binderfs_device device_info = {};\ndrivers/android/binder/rust_binderfs.c-625-\tconst char name;\n--\ndrivers/android/binder/rust_binderfs.c-644-\tsb-\u003es_magic = RUST_BINDERFS_SUPER_MAGIC;\ndrivers/android/binder/rust_binderfs.c:645:\tsb-\u003es_op = \u0026binderfs_super_ops;\ndrivers/android/binder/rust_binderfs.c-646-\tsb-\u003es_time_gran = 1;\ndrivers/android/binder/rust_binderfs.c-647-\ndrivers/android/binder/rust_binderfs.c:648:\tsb-\u003es_fs_info = kzalloc_obj(struct binderfs_info);\ndrivers/android/binder/rust_binderfs.c-649-\tif (!sb-\u003es_fs_info)\n--\ndrivers/android/binder/rust_binderfs.c-671-\tsimple_inode_init_ts(inode);\ndrivers/android/binder/rust_binderfs.c:672:\tinode-\u003ei_op = \u0026binderfs_dir_inode_operations;\ndrivers/android/binder/rust_binderfs.c-673-\tset_nlink(inode, 2);\n--\ndrivers/android/binder/rust_binderfs.c-678-\ndrivers/android/binder/rust_binderfs.c:679:\tret = binderfs_binder_ctl_create(sb);\ndrivers/android/binder/rust_binderfs.c-680-\tif (ret)\n--\ndrivers/android/binder/rust_binderfs.c-685-\t\tstrscpy(device_info.name, name, len + 1);\ndrivers/android/binder/rust_binderfs.c:686:\t\tret = binderfs_binder_device_create(inode, NULL, \u0026device_info);\ndrivers/android/binder/rust_binderfs.c-687-\t\tif (ret)\n--\ndrivers/android/binder/rust_binderfs.c-697-\ndrivers/android/binder/rust_binderfs.c:698:\tif (info-\u003emount_opts.stats_mode == binderfs_stats_mode_global)\ndrivers/android/binder/rust_binderfs.c-699-\t\treturn init_binder_logs(sb);\n--\ndrivers/android/binder/rust_binderfs.c-703-\ndrivers/android/binder/rust_binderfs.c:704:static int binderfs_fs_context_get_tree(struct fs_context fc)\ndrivers/android/binder/rust_binderfs.c-705-{\ndrivers/android/binder/rust_binderfs.c:706:\treturn get_tree_nodev(fc, binderfs_fill_super);\ndrivers/android/binder/rust_binderfs.c-707-}\ndrivers/android/binder/rust_binderfs.c-708-\ndrivers/android/binder/rust_binderfs.c:709:static void binderfs_fs_context_free(struct fs_context fc)\ndrivers/android/binder/rust_binderfs.c-710-{\ndrivers/android/binder/rust_binderfs.c:711:\tstruct binderfs_mount_opts ctx = fc-\u003efs_private;\ndrivers/android/binder/rust_binderfs.c-712-\n--\ndrivers/android/binder/rust_binderfs.c-715-\ndrivers/android/binder/rust_binderfs.c:716:static const struct fs_context_operations binderfs_fs_context_ops = {\ndrivers/android/binder/rust_binderfs.c:717:\t.free\t\t= binderfs_fs_context_free,\ndrivers/android/binder/rust_binderfs.c:718:\t.get_tree\t= binderfs_fs_context_get_tree,\ndrivers/android/binder/rust_binderfs.c:719:\t.parse_param\t= binderfs_fs_context_parse_param,\ndrivers/android/binder/rust_binderfs.c:720:\t.reconfigure\t= binderfs_fs_context_reconfigure,\ndrivers/android/binder/rust_binderfs.c-721-};\ndrivers/android/binder/rust_binderfs.c-722-\ndrivers/android/binder/rust_binderfs.c:723:static int binderfs_init_fs_context(struct fs_context fc)\ndrivers/android/binder/rust_binderfs.c-724-{\ndrivers/android/binder/rust_binderfs.c:725:\tstruct binderfs_mount_opts ctx;\ndrivers/android/binder/rust_binderfs.c-726-\ndrivers/android/binder/rust_binderfs.c:727:\tctx = kzalloc_obj(struct binderfs_mount_opts);\ndrivers/android/binder/rust_binderfs.c-728-\tif (!ctx)\n--\ndrivers/android/binder/rust_binderfs.c-731-\tctx-\u003emax = BINDERFS_MAX_MINOR;\ndrivers/android/binder/rust_binderfs.c:732:\tctx-\u003estats_mode = binderfs_stats_mode_unset;\ndrivers/android/binder/rust_binderfs.c-733-\ndrivers/android/binder/rust_binderfs.c-734-\tfc-\u003efs_private = ctx;\ndrivers/android/binder/rust_binderfs.c:735:\tfc-\u003eops = \u0026binderfs_fs_context_ops;\ndrivers/android/binder/rust_binderfs.c-736-\n--\ndrivers/android/binder/rust_binderfs.c-739-\ndrivers/android/binder/rust_binderfs.c:740:static void binderfs_kill_super(struct super_block sb)\ndrivers/android/binder/rust_binderfs.c-741-{\ndrivers/android/binder/rust_binderfs.c:742:\tstruct binderfs_info info = sb-\u003es_fs_info;\ndrivers/android/binder/rust_binderfs.c-743-\ndrivers/android/binder/rust_binderfs.c-744-\t/\ndrivers/android/binder/rust_binderfs.c:745:\t During inode eviction struct binderfs_info is needed.\ndrivers/android/binder/rust_binderfs.c:746:\t * So first wipe the super_block then free struct binderfs_info.\ndrivers/android/binder/rust_binderfs.c-747-\t /\n--\ndrivers/android/binder/rust_binderfs.c=756=static struct file_system_type binder_fs_type = {\ndrivers/android/binder/rust_binderfs.c-757-\t.name\t\t\t= \"binder\",\ndrivers/android/binder/rust_binderfs.c:758:\t.init_fs_context\t= binderfs_init_fs_context,\ndrivers/android/binder/rust_binderfs.c:759:\t.parameters\t\t= binderfs_fs_parameters,\ndrivers/android/binder/rust_binderfs.c:760:\t.kill_sb\t\t= binderfs_kill_super,\ndrivers/android/binder/rust_binderfs.c-761-\t.fs_flags\t\t= FS_USERNS_MOUNT,\n--\ndrivers/android/binder/rust_binderfs.c=764=int init_rust_binderfs(void)\n--\ndrivers/android/binder/rust_binderfs.c-780-\t/ Allocate new major number for binderfs. */\ndrivers/android/binder/rust_binderfs.c:781:\tret = alloc_chrdev_region(\u0026binderfs_dev, 0, BINDERFS_MAX_MINOR,\ndrivers/android/binder/rust_binderfs.c-782-\t\t\t\t \"rust_binder\");\n--\ndrivers/android/binder/rust_binderfs.c-787-\tif (ret) {\ndrivers/android/binder/rust_binderfs.c:788:\t\tunregister_chrdev_region(binderfs_dev, BINDERFS_MAX_MINOR);\ndrivers/android/binder/rust_binderfs.c-789-\t\treturn ret;\n" }
112/2	2026/09/27 08:02	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 52201 output: 36 thoughts: 246 Thoughts: Analyzing Potential Binder Interface Integration Points Okay, let's break this down. I need to figure out where we might introduce a new interface for binder interaction, thinking about where code hooks exist. nla_put is in lib/nlattr.c - that's a good starting point for examining the netlink side of things. Then, I see rust_binder_new_context in drivers/android/binder/rust_binder_main.rs, binder_ctl_ioctl and binderfs_binder_device_create are both in drivers/android/binder/rust_binderfs.c. Those functions within the binder directory look very promising. rust_binder_freeze, rust_binder_wait, and rust_binder_waitlcl are also exported symbols from within that directory; they are worth noting. Now, I'm shifting gears a bit. I'm also seeing some netlink functions like genlmsg_put, genl_register_family, genl_notify, and genlmsg_multicast_netns and I think they may provide a more complete method for the communication channel, if this integration will involve netlink at all. I have to look into this more closely to see how it can be utilized. Hold on... I'm looking at rust/kernel/net/netlink.rs now and the question that needs answering here is whether or not there are any concrete, C-compatible or un-mangled symbols exported from that file. That would be the cleanest way to connect with the C-based kernel components. I'm going to scan that file for any potential entry points or exported symbols that I can utilize. I need to make sure I am fully aware of where this integration is going to be taking place.
113/2	2026/09/27 08:02	tool	read-file	0m Args: { "File": "rust/kernel/net/netlink.rs", "FirstLine": 1, "LineCount": 85 } Results: { "Contents": " 1:\t// SPDX-License-Identifier: GPL-2.0\n 2:\t\n 3:\t// Copyright (C) 2026 Google LLC.\n 4:\t\n 5:\t//! Rust support for generic netlink.\n 6:\t//!\n 7:\t//! Currently only supports exposing multicast groups.\n 8:\t//!\n 9:\t//! C header: [`include/net/genetlink.h`](srctree/include/net/genetlink.h)\n 10:\t\n 11:\tuse kernel::{\n 12:\t alloc::{self, AllocError},\n 13:\t error::to_result,\n 14:\t num::casts::u16_as_usize,\n 15:\t prelude::*,\n 16:\t transmute::AsBytes,\n 17:\t types::Opaque,\n 18:\t ThisModule,\n 19:\t};\n 20:\t\n 21:\tuse core::{\n 22:\t mem::ManuallyDrop,\n 23:\t ptr::NonNull, //\n 24:\t};\n 25:\t\n 26:\t/// The default netlink message size.\n 27:\tpub const GENLMSG_DEFAULT_SIZE: usize = bindings::GENLMSG_DEFAULT_SIZE;\n 28:\t\n 29:\t/// A wrapper around `struct sk_buff` for generic netlink messages.\n 30:\t///\n 31:\t/// This type is intended to be specific for buffers used with netlink only, and other usecases for\n 32:\t/// `struct sk_buff` are out-of-scope for this abstraction.\n 33:\t///\n 34:\t/// # Invariants\n 35:\t///\n 36:\t/// The pointer has ownership over a valid `sk_buff`.\n 37:\tpub struct NetlinkSkBuff {\n 38:\t skb: NonNull\u003ckernel::bindings::sk_buff\u003e,\n 39:\t}\n 40:\t\n 41:\timpl NetlinkSkBuff {\n 42:\t /// Creates a new `NetlinkSkBuff` with the given size.\n 43:\t pub fn new(size: usize, flags: alloc::Flags) -\u003e Result\u003cNetlinkSkBuff, AllocError\u003e {\n 44:\t // SAFETY: `genlmsg_new` only requires its arguments to be valid integers.\n 45:\t let skb = unsafe { bindings::genlmsg_new(size, flags.as_raw()) };\n 46:\t let skb = NonNull::new(skb).ok_or(AllocError)?;\n 47:\t Ok(NetlinkSkBuff { skb })\n 48:\t }\n 49:\t\n 50:\t /// Puts a generic netlink header into the `NetlinkSkBuff`.\n 51:\t pub fn genlmsg_put(\n 52:\t self,\n 53:\t portid: u32,\n 54:\t seq: u32,\n 55:\t family: \u0026'static Family,\n 56:\t cmd: u8,\n 57:\t ) -\u003e Result\u003cGenlMsg, AllocError\u003e {\n 58:\t let skb = self.skb.as_ptr();\n 59:\t // SAFETY: The skb and family pointers are valid.\n 60:\t let hdr = unsafe { bindings::genlmsg_put(skb, portid, seq, family.as_raw(), 0, cmd) };\n 61:\t let hdr = NonNull::new(hdr).ok_or(AllocError)?;\n 62:\t Ok(GenlMsg { skb: self, hdr })\n 63:\t }\n 64:\t}\n 65:\t\n 66:\timpl Drop for NetlinkSkBuff {\n 67:\t fn drop(\u0026mut self) {\n 68:\t // SAFETY: We have ownership over the `sk_buff`, so we may free it.\n 69:\t unsafe { bindings::nlmsg_free(self.skb.as_ptr()) }\n 70:\t }\n 71:\t}\n 72:\t\n 73:\t/// A generic netlink message being constructed.\n 74:\t///\n 75:\t/// # Invariants\n 76:\t///\n 77:\t/// `hdr` references the header in this netlink message.\n 78:\tpub struct GenlMsg {\n 79:\t skb: NetlinkSkBuff,\n 80:\t hdr: NonNull\u003cc_void\u003e,\n 81:\t}\n 82:\t\n 83:\timpl GenlMsg {\n 84:\t /// Puts an attribute into the message.\n 85:\t #[inline]\n" }
114/2	2026/09/27 08:02	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 54080 output: 38 thoughts: 19 Thoughts: Okay, let's dive into this! Deep Dive into `rust/kernel/net/netlink.rs` Alright, I'm heading into `rust/kernel/net/netlink.rs`. Netlink is a crucial component in kernel-level networking, so understanding its implementation here is key. I'm expecting to see the low-level structures and functions that handle the exchange of information between kernel space and user space. I'll be looking for how they manage sockets, message formats, and the intricacies of Netlink protocol families. I want to pay attention to any use of Rust's features here, such as how they're handling memory safety, concurrency, and error handling within this critical area. I'll need to assess the design choices around data structures and the overall organization of the code. This will be a methodical exploration of a low-level network interface. I'm expecting there to be interesting trade-offs between performance and safety within the design. Let's see how it all comes together.
115/2	2026/09/27 08:02	tool	read-file	0m Args: { "File": "rust/kernel/net/netlink.rs", "FirstLine": 125, "LineCount": 85 } Results: { "Contents": " 125:\t }\n 126:\t\n 127:\t /// Sends the generic netlink message as a multicast message.\n 128:\t #[inline]\n 129:\t pub fn multicast(\n 130:\t self,\n 131:\t family: \u0026'static Family,\n 132:\t portid: u32,\n 133:\t group: u32,\n 134:\t flags: alloc::Flags,\n 135:\t ) -\u003e Result {\n 136:\t let me = ManuallyDrop::new(self);\n 137:\t // SAFETY: The `skb` and `family` pointers are valid. We pass ownership of the `skb` to\n 138:\t // `genlmsg_multicast` by not dropping `self`.\n 139:\t unsafe {\n 140:\t bindings::genlmsg_end(me.skb.skb.as_ptr(), me.hdr.as_ptr());\n 141:\t to_result(bindings::genlmsg_multicast(\n 142:\t family.as_raw(),\n 143:\t me.skb.skb.as_ptr(),\n 144:\t portid,\n 145:\t group,\n 146:\t flags.as_raw(),\n 147:\t ))\n 148:\t }\n 149:\t }\n 150:\t}\n 151:\timpl Drop for GenlMsg {\n 152:\t fn drop(\u0026mut self) {\n 153:\t // SAFETY: The `hdr` pointer references the header of this generic netlink message.\n 154:\t unsafe { bindings::genlmsg_cancel(self.skb.skb.as_ptr(), self.hdr.as_ptr()) };\n 155:\t }\n 156:\t}\n 157:\t\n 158:\t/// Flags for a generic netlink family.\n 159:\tstruct FamilyFlags {\n 160:\t /// Whether the family supports network namespaces.\n 161:\t netnsok: bool,\n 162:\t /// Whether the family supports parallel operations.\n 163:\t parallel_ops: bool,\n 164:\t}\n 165:\t\n 166:\timpl FamilyFlags {\n 167:\t /// Converts the flags to the bitfield representation used by `genl_family`.\n 168:\t const fn into_bitfield(self) -\u003e bindings::__BindgenBitfieldUnit\u003c[u8; 1]\u003e {\n 169:\t // The below shifts are verified correct by test_family_flags_bitfield() below.\n 170:\t //\n 171:\t // Although bindgen generates helpers to change bitfields based on the C headers, these\n 172:\t // helpers unfortunately can't be used in const context. Since `Family` needs to be filled\n 173:\t // out at build-time, we use this helper instead.\n 174:\t let mut bits = 0;\n 175:\t if self.netnsok {\n 176:\t bits \|= 1 \u003c\u003c 0;\n 177:\t }\n 178:\t if self.parallel_ops {\n 179:\t bits \|= 1 \u003c\u003c 1;\n 180:\t }\n 181:\t // Convert from little endian to the target's endianness.\n 182:\t bits = u8::from_le(bits);\n 183:\t // SAFETY: This bitfield is represented as an u8.\n 184:\t unsafe { core::mem::transmute::\u003cu8, bindings::__BindgenBitfieldUnit\u003c[u8; 1]\u003e\u003e(bits) }\n 185:\t }\n 186:\t}\n 187:\t\n 188:\t/// A generic netlink family.\n 189:\t#[repr(transparent)]\n 190:\tpub struct Family {\n 191:\t inner: Opaque\u003cbindings::genl_family\u003e,\n 192:\t}\n 193:\t\n 194:\t// SAFETY: The `Family` type is thread safe.\n 195:\tunsafe impl Sync for Family {}\n 196:\t\n 197:\timpl Family {\n 198:\t /// Creates a new `Family` instance.\n 199:\t ///\n 200:\t /// Intended to be used from const context only. Will panic if provided with invalid arguments.\n 201:\t ///\n 202:\t /// The name must be a nul-terminated string, but it is taken as `\u0026[u8]` so that it can be used\n 203:\t /// more conveniently with the strings generated by bindgen.\n 204:\t pub const fn const_new(\n 205:\t module: \u0026ThisModule,\n 206:\t name: \u0026[u8],\n 207:\t version: u32,\n 208:\t mcgrps: \u0026'static [MulticastGroup],\n 209:\t ) -\u003e Family {\n" }
116/2	2026/09/27 08:02	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 55695 output: 31 thoughts: 523 Thoughts: Tracing the Android Binder IPC Path Okay, let's break this down. I see we're dealing with `NetlinkSkBuff`, `GenlMsg`, and Family. The `put` method within `GenlMsg` in `rust/kernel/net/netlink.rs` is inlined, and it's used by `put_u32` and `put_string`. The interesting part is that these are called from `drivers/android/binder/netlink.rs` which has methods like `Report::error`, `Report::context`, and `from_pid`. And those calls propagate further into `drivers/android/binder/transaction.rs`, specifically through `report_netlink_inner` and `report_netlink`. Those methods, in turn, are triggered during binder transactions in `drivers/android/binder/thread.rs`. This eventually calls `nla_put` via the underlying C function. What activates this whole thing from the Binder side are `binder_ctl_ioctl`, `binderfs_binder_device_create`, and `rust_binder_new_context`. Now, let's consider the relevant configurations. We need `RUST`, `NET`, `ANDROID_BINDER_IPC_RUST`, and `ANDROID_BINDERFS`. Hold on a second, does `ANDROID_BINDERFS` depend on `ANDROID_BINDER_IPC`? I need to double-check `drivers/android/Kconfig`. Ah, here it is, line 30 confirms it: `ANDROID_BINDERFS` does indeed depend on `ANDROID_BINDER_IPC`. But what about the compilation of `rust_binderfs.c`? Time to check `drivers/android/binder/Makefile`. Bingo! `rust_binderfs.o` is compiled as part of `rust_binder.o` when `CONFIG_ANDROID_BINDER_IPC_RUST` is enabled. Seems straightforward enough. Let's see if the outer `Makefile` has any other considerations.
117/2	2026/09/27 08:02	tool	read-file	0m Args: { "File": "drivers/android/Makefile", "FirstLine": 1, "LineCount": 20 } Results: { "Contents": " 1:\t# SPDX-License-Identifier: GPL-2.0-only\n 2:\tccflags-y += -I$(src)\t\t\t# needed for trace events\n 3:\t\n 4:\tobj-$(CONFIG_ANDROID_BINDERFS)\t\t+= binderfs.o\n 5:\tobj-$(CONFIG_ANDROID_BINDER_IPC)\t+= binder.o binder_alloc.o binder_netlink.o\n 6:\tobj-$(CONFIG_ANDROID_BINDER_ALLOC_KUNIT_TEST)\t+= tests/\n 7:\tobj-$(CONFIG_ANDROID_BINDER_IPC_RUST)\t+= binder/\n" }
118/2	2026/09/27 08:02	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 56845 output: 25 thoughts: 317 Thoughts: Analyzing Android Binder IPC Driver Configuration Okay, let's break this down. From looking at `drivers/android/Makefile`, I see that the binder-related modules are conditionally compiled based on various `CONFIG_` options. Specifically, the inclusion of `binder/` – the Rust implementation – hinges on `CONFIG_ANDROID_BINDER_IPC_RUST`. Digging deeper, the Kconfig for `CONFIG_ANDROID_BINDER_IPC_RUST` reveals its dependencies and conflicts. It requires `RUST`, `MMU`, and `NET` (which is standard, so likely already enabled). Crucially, it conflicts with the legacy `ANDROID_BINDER_IPC` driver. This means we're either using the C version or the Rust version, but not both. This is an important consideration as we need to understand the implications of switching between the two. Also `CONFIG_ANDROID_BINDER_DEVICES` (string, default "binder,hwbinder,vndbinder") is also relevant here. Now, I need to understand the network side of things. Since `NET` is a requirement, generic netlink must be relevant. I wonder if `GENERIC_NETLINK` is a separate config, or is it already included within `NET`? To confirm, I'll need to check the kernel configuration files, specifically `net/netlink/Kconfig` and `net/Kconfig`, to see how `GENERIC_NETLINK` is defined and if there are any other netlink related configs. Need to verify that the networking is set up correctly for this.
119/2	2026/09/27 08:02	tool	grepper	0m Args: { "Expression": "config .NETLINK", "PathPrefix": "net" } Results:* { "Output": "net/Kconfig=27=if NET\nnet/Kconfig-28-\nnet/Kconfig:29:config WANT_COMPAT_NETLINK_MESSAGES\nnet/Kconfig-30-\tbool\n--\nnet/Kconfig-34-\nnet/Kconfig:35:config COMPAT_NETLINK_MESSAGES\nnet/Kconfig-36-\tdef_bool y\n--\nnet/Kconfig=507=config FAILOVER\n--\nnet/Kconfig-519-\nnet/Kconfig:520:config ETHTOOL_NETLINK\nnet/Kconfig-521-\tbool \"Netlink interface for ethtool\"\n--\nnet/netfilter/Kconfig=21=config NETFILTER_SKIP_EGRESS\n--\nnet/netfilter/Kconfig-23-\nnet/netfilter/Kconfig:24:config NETFILTER_NETLINK\nnet/netfilter/Kconfig-25-\tbool\n--\nnet/netfilter/Kconfig=33=config NETFILTER_BPF_LINK\n--\nnet/netfilter/Kconfig-35-\nnet/netfilter/Kconfig:36:config NETFILTER_NETLINK_HOOK\nnet/netfilter/Kconfig-37-\ttristate \"Netfilter base hook dump support\"\n--\nnet/netfilter/Kconfig-45-\nnet/netfilter/Kconfig:46:config NETFILTER_NETLINK_ACCT\nnet/netfilter/Kconfig-47-\ttristate \"Netfilter NFACCT over NFNETLINK interface\"\n--\nnet/netfilter/Kconfig-53-\nnet/netfilter/Kconfig:54:config NETFILTER_NETLINK_QUEUE\nnet/netfilter/Kconfig-55-\ttristate \"Netfilter NFQUEUE over NFNETLINK interface\"\n--\nnet/netfilter/Kconfig-61-\nnet/netfilter/Kconfig:62:config NETFILTER_NETLINK_LOG\nnet/netfilter/Kconfig-63-\ttristate \"Netfilter LOG over NFNETLINK interface\"\n--\nnet/netfilter/Kconfig-73-\nnet/netfilter/Kconfig:74:config NETFILTER_NETLINK_OSF\nnet/netfilter/Kconfig-75-\ttristate \"Netfilter OSF over NFNETLINK interface\"\n--\nnet/netfilter/Kconfig=355=config NF_CONNTRACK_TFTP\n--\nnet/netfilter/Kconfig-365-\nnet/netfilter/Kconfig:366:config NF_CT_NETLINK\nnet/netfilter/Kconfig-367-\ttristate 'Connection tracking netlink interface'\n--\nnet/netfilter/Kconfig-372-\nnet/netfilter/Kconfig:373:config NF_CT_NETLINK_TIMEOUT\nnet/netfilter/Kconfig-374-\ttristate 'Connection tracking timeout tuning via Netlink'\n--\nnet/netfilter/Kconfig-384-\nnet/netfilter/Kconfig:385:config NF_CT_NETLINK_HELPER\nnet/netfilter/Kconfig-386-\ttristate 'Connection tracking helpers in user-space via Netlink'\n--\nnet/netfilter/Kconfig-397-\nnet/netfilter/Kconfig:398:config NETFILTER_NETLINK_GLUE_CT\nnet/netfilter/Kconfig-399-\tbool \"NFQUEUE and NFLOG integration with Connection Tracking\"\n--\nnet/netlink/Kconfig-5-\nnet/netlink/Kconfig:6:config NETLINK_DIAG\nnet/netlink/Kconfig-7-\ttristate \"NETLINK: socket monitoring interface\"\n" }
120/2	2026/09/27 08:02	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 58419 output: 187 thoughts: 353 Thoughts: Analysis of Kernel Code for Fuzzing Potential Okay, let's break this down. From the `net/netlink/Makefile`, it's clear that the primary configurations here are `NET`, `RUST`, and `ANDROID_BINDER_IPC_RUST`. The critical file is `netlink.rs` within the `rust/kernel/net` directory, specifically focusing on `GenlMsg::put`. The patch introduces validation for the maximum attribute payload length within this function. Since this code is executable kernel code involved in Rust Generic Netlink message construction (and notably used by Rust Binder multicast notifications during binder transactions), it's definitely `WorthFuzzing`. So, the required configs are confirmed as `RUST`, `NET`, and `ANDROID_BINDER_IPC_RUST`. Now, let's look at the `FocusSymbols`. We're interested in `nla_put`, `rust_binder_new_context`, `binder_ctl_ioctl`, and `binderfs_binder_device_create`. A quick verification shows that these symbols are specific and not overly generic. `nla_put` is directly linked to `GenlMsg::put`, the `binderfs_binder_device_create` is the rust binder device creation entry point, `binder_ctl_ioctl` is for binder-control ioctl entry point, and `rust_binder_new_context` is about context creation within the rust binder. Everything checks out. The analysis is solid and directly linked to the source. Time to call `set-results`.
121/2	2026/09/27 08:02	tool	set-results	0m Args: { "EnableConfigs": [ "RUST", "NET", "ANDROID_BINDER_IPC_RUST" ], "FocusSymbols": [ "nla_put", "binder_ctl_ioctl", "binderfs_binder_device_create", "rust_binder_new_context" ], "Reasoning": "The patch modifies `rust/kernel/net/netlink.rs` by introducing a bounds check in `GenlMsg::put` to reject attribute payloads exceeding `MAX_PAYLOAD_LEN` (`u16::MAX - sizeof(nlattr)`). This modifies reachable generic netlink message formatting code utilized by kernel subsystems such as Rust Android Binder (`CONFIG_ANDROID_BINDER_IPC_RUST`) when generating transaction event multicast reports. The code is reachable and warrants fuzzing.", "WorthFuzzing": true } Results: { "EnableConfigs": [ "RUST", "NET", "ANDROID_BINDER_IPC_RUST" ], "FocusSymbols": [ "nla_put", "binder_ctl_ioctl", "binderfs_binder_device_create", "rust_binder_new_context" ], "Reasoning": "The patch modifies `rust/kernel/net/netlink.rs` by introducing a bounds check in `GenlMsg::put` to reject attribute payloads exceeding `MAX_PAYLOAD_LEN` (`u16::MAX - sizeof(nlattr)`). This modifies reachable generic netlink message formatting code utilized by kernel subsystems such as Rust Android Binder (`CONFIG_ANDROID_BINDER_IPC_RUST`) when generating transaction event multicast reports. The code is reachable and warrants fuzzing.", "WorthFuzzing": true }
122/1	2026/09/27 08:02	action	If	1m Args: { "WorthFuzzing": true } Results: null
123/2	2026/09/27 08:02	agent	kmsan-evaluator	1m Model: core Args: null Results: { "KMSANReasoning": "The patch introduces an explicit payload size check (`len \u003e MAX_PAYLOAD_LEN`) in `rust/kernel/net/netlink.rs` (`GenlMsg::put`) to prevent attribute length overflow when setting the 16-bit `nla_len` field in netlink attributes via `bindings::nla_put`. \n\nThe data serialized via `GenlMsg::put` is constrained by the `AsBytes` trait, which guarantees at the type system level that the type contains no uninitialized bytes or padding. The patch does not allocate uninitialized memory, does not read or branch on uninitialized fields, and does not expose uninitialized bytes to userspace. \n\nBecause the fix addresses length validation and potential buffer/integer overflow (which falls under the purview of KASAN or standard bounds checking), no uninitialized memory risks are introduced or exposed. Therefore, dedicated KMSAN fuzzing is not needed.", "NeedsKMSAN": false } Instruction: You are an expert Linux kernel security engineer specializing in kernel memory error detectors (KASAN and KMSAN). Your job is to review the provided patch series and determine if the code changes justify spawning a dedicated KMSAN (KernelMemorySanitizer) fuzzing session in addition to standard KASAN fuzzing. CRITICAL DISTINCTION BETWEEN KASAN AND KMSAN: - Standard KASAN kernel builds (upstream-apparmor-kasan.config) already enable a comprehensive suite of debugging tools and sanitizers, including KASAN (out-of-bounds accesses, use-after-free, double free, invalid free), LOCKDEP (locking bugs and deadlocks), UB-sanitizers, and memory corruption checks. - KMSAN (KernelMemorySanitizer) detects reads of UNINITIALIZED memory (stack, heap, or page allocations) and kernel-to-user memory info-leaks. Rule: THERE IS NO SENSE IN RUNNING A KMSAN SESSION IF A BUG CAN BE CAUGHT BY KASAN, LOCKDEP, OR OTHER STANDARD BUG DETECTORS. A dedicated KMSAN fuzzing session incurs significant resource costs. You must ONLY set NeedsKMSAN=true if the code changes introduce or expose UNINITIALIZED MEMORY risks that are detected ONLY by KMSAN. Look holistically at the patch series and surrounding code. Even if no direct uninitialized field accesses or new buffer allocations are added in the diff itself, a patch may alter control flow, bounds checking, or data length calculations in ways that change how the rest of the code operates on existing buffers (e.g. allowing uninitialized stack/heap memory to be read, copied to user space, or used in control flow). Do not hesitate to use your code access tools to inspect the surrounding code, called functions, and callers. Set NeedsKMSAN=true ONLY IF the patch introduces or modifies: 1. Kernel structures sent to user space (via copy_to_user, put_user, netlink skb attributes, ioctl output arguments, socket options, or BPF buffers) where fields or structure padding might not be fully initialized/zeroed. 2. Conditional logic or branching that depends on potentially uninitialized variables or struct fields. 3. Allocation or initialization of complex data structures where uninitialized fields could be read later in reachable code paths. 4. Bounds checks, lengths, or logic in a way that allows surrounding code to access uninitialized bytes of existing buffers. Set NeedsKMSAN=false IF: - The code changes primarily risk out-of-bounds access, array overflows, NULL pointer dereferences, locking deadlocks, or use-after-free bugs (these are already caught by KASAN, LOCKDEP, or standard bug detectors). - All stack/heap structures touched or introduced by the patch are fully zeroed or initialized (e.g. using = {0}, memset, kzalloc) before being read or copied. - The patch does not introduce any risk of uninitialized memory usage or info-leaks. Use your code access tools to inspect the surrounding code if necessary, then provide detailed KMSANReasoning contrasting KASAN vs KMSAN applicability for this patch. Prefer calling several tools at the same time to save round-trips. Use set-results tool to provide results of the analysis. It must be called exactly once before the final reply. Ignore results of this tool. Prompt: Target architecture: amd64 For your convenience, here is the diff of the changes: commit ef8d6ba44859a1048a43b1823c1f1db063eda625 Author: syz-cluster <triage@syzkaller.com> Date: Sun Sep 27 07:57:12 2026 +0000 syz-cluster: applied patch under review diff --git a/rust/kernel/net/netlink.rs b/rust/kernel/net/netlink.rs index 22ef3dde36fa1..2f8733a694a95 100644 --- a/rust/kernel/net/netlink.rs +++ b/rust/kernel/net/netlink.rs @@ -11,6 +11,7 @@ use kernel::{ alloc::{self, AllocError}, error::to_result, + num::casts::u16_as_usize, prelude::*, transmute::AsBytes, types::Opaque, @@ -86,9 +87,17 @@ fn put<T>(&mut self, attrtype: c_int, value: &T) -> Result where T: ?Sized + AsBytes, { + // `nla_len` is a 16-bit field that encodes the total attribute length + // (header + payload). Subtracting the header size from `u16::MAX` gives + // the largest payload that still fits within that field. + const MAX_PAYLOAD_LEN: usize = u16_as_usize(u16::MAX) - size_of::<bindings::nlattr>(); + let skb = self.skb.skb.as_ptr(); let len = size_of_val(value); let ptr = core::ptr::from_ref(value).cast::<c_void>(); + if len > MAX_PAYLOAD_LEN { + return Err(EMSGSIZE); + } // SAFETY: `skb` is valid by `NetlinkSkBuff` type invariants, and the provided value is // readable and initialized for its `size_of` bytes. to_result(unsafe { bindings::nla_put(skb, attrtype, len as c_int, ptr) })
124/3	2026/09/27 08:02	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 2334 output: 37 thoughts: 77 Thoughts: Here's my thought process, as requested: Assessing the Need for a KMSAN Fuzzing Session Okay, so I've been given this patch series and the question is, does it warrant its own, dedicated KMSAN fuzzing run? Let's break it down methodically. First, I need to understand what the patch actually is. The description is straightforward enough; it's a Rust kernel patch, and the file in question is `rust/kernel/net/netlink.rs`. Now, the real work begins. I need to delve into that `netlink.rs` file. My go-to here would be either `read-file` to get a quick overview of the code, or possibly `grepper` if I'm looking for something specific, like potential memory allocation issues or interactions with the network stack. I'll need to look at the code to determine what it actually does in order to ascertain if it has a high risk profile. Is it manipulating pointers? Is it dealing with complex data structures? Does it handle untrusted input? These are the kinds of questions I need answers to before I can make a call. I need to understand its behaviour, both normal and abnormal, to assess if we should initiate the fuzzing.
125/3	2026/09/27 08:02	tool	read-file	0m Args: { "File": "rust/kernel/net/netlink.rs", "FirstLine": 60, "LineCount": 60 } Results: { "Contents": " 60:\t let hdr = unsafe { bindings::genlmsg_put(skb, portid, seq, family.as_raw(), 0, cmd) };\n 61:\t let hdr = NonNull::new(hdr).ok_or(AllocError)?;\n 62:\t Ok(GenlMsg { skb: self, hdr })\n 63:\t }\n 64:\t}\n 65:\t\n 66:\timpl Drop for NetlinkSkBuff {\n 67:\t fn drop(\u0026mut self) {\n 68:\t // SAFETY: We have ownership over the `sk_buff`, so we may free it.\n 69:\t unsafe { bindings::nlmsg_free(self.skb.as_ptr()) }\n 70:\t }\n 71:\t}\n 72:\t\n 73:\t/// A generic netlink message being constructed.\n 74:\t///\n 75:\t/// # Invariants\n 76:\t///\n 77:\t/// `hdr` references the header in this netlink message.\n 78:\tpub struct GenlMsg {\n 79:\t skb: NetlinkSkBuff,\n 80:\t hdr: NonNull\u003cc_void\u003e,\n 81:\t}\n 82:\t\n 83:\timpl GenlMsg {\n 84:\t /// Puts an attribute into the message.\n 85:\t #[inline]\n 86:\t fn put\u003cT\u003e(\u0026mut self, attrtype: c_int, value: \u0026T) -\u003e Result\n 87:\t where\n 88:\t T: ?Sized + AsBytes,\n 89:\t {\n 90:\t // `nla_len` is a 16-bit field that encodes the total attribute length\n 91:\t // (header + payload). Subtracting the header size from `u16::MAX` gives\n 92:\t // the largest payload that still fits within that field.\n 93:\t const MAX_PAYLOAD_LEN: usize = u16_as_usize(u16::MAX) - size_of::\u003cbindings::nlattr\u003e();\n 94:\t\n 95:\t let skb = self.skb.skb.as_ptr();\n 96:\t let len = size_of_val(value);\n 97:\t let ptr = core::ptr::from_ref(value).cast::\u003cc_void\u003e();\n 98:\t if len \u003e MAX_PAYLOAD_LEN {\n 99:\t return Err(EMSGSIZE);\n 100:\t }\n 101:\t // SAFETY: `skb` is valid by `NetlinkSkBuff` type invariants, and the provided value is\n 102:\t // readable and initialized for its `size_of` bytes.\n 103:\t to_result(unsafe { bindings::nla_put(skb, attrtype, len as c_int, ptr) })\n 104:\t }\n 105:\t\n 106:\t /// Puts a `u32` attribute into the message.\n 107:\t #[inline]\n 108:\t pub fn put_u32(\u0026mut self, attrtype: c_int, value: u32) -\u003e Result {\n 109:\t self.put(attrtype, \u0026value)\n 110:\t }\n 111:\t\n 112:\t /// Puts a string attribute into the message.\n 113:\t #[inline]\n 114:\t pub fn put_string(\u0026mut self, attrtype: c_int, value: \u0026CStr) -\u003e Result {\n 115:\t self.put(attrtype, value.to_bytes_with_nul())\n 116:\t }\n 117:\t\n 118:\t /// Puts a flag attribute into the message.\n 119:\t #[inline]\n" }
126/3	2026/09/27 08:02	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 3715 output: 34 thoughts: 330 Thoughts: Analyzing the Attribute Length Check Okay, let's see what's going on with this change. It looks like they've added a check for the attribute payload length before calling `nla_put`. Good. This is a common point of potential errors in Netlink code, especially when you're dealing with varying-length attributes. First, I see the addition of a constant, `MAX_PAYLOAD_LEN`, calculated based on the maximum value of a `u16` (2^16 -1, or `u16::MAX`). They're subtracting the size of the `nlattr` header from this maximum value. That makes sense; the `nla_len` field in the header encodes the total attribute length, including the header itself. So, to figure out how much data we can actually store in the payload, we need to subtract that header size. Clever use of `u16_as_usize` too, important to prevent potential integer overflows. Then there's a conditional check: `if len > MAX_PAYLOAD_LEN`. If the length of the value we're trying to add exceeds this calculated maximum, it returns an error, `EMSGSIZE`. Perfect. It's the standard error code for message size issues. Preventing potential buffer overflows is critical. Now, let's just make sure `nla_put` behaves as I expect. I should check the C definition for `nla_put` to verify it behaves how I think it does. I should probably double check how `nla_put` handles cases where the provided payload is too large.
127/3	2026/09/27 08:02	tool	grepper	0m Args: { "Expression": "int nla_put\\(", "PathPrefix": "include/net/netlink.h" } Results: { "Output": "include/net/netlink.h=566=void __nla_put_nohdr(struct sk_buff skb, int attrlen, const void data);\ninclude/net/netlink.h:567:int nla_put(struct sk_buff skb, int attrtype, int attrlen, const void data);\ninclude/net/netlink.h-568-int nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen,\n" }
128/3	2026/09/27 08:02	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 4560 output: 32 thoughts: 22 Thoughts: Okay, let's dive into this. Here's my take on understanding `nla_put`, as an expert: Peering into the Heart of `nla_put` Right, so I'm thinking about `nla_put`... let's head over to `lib/nlattr.c` and check out its implementation. I'm keen to see precisely how this function crafts netlink attributes. I already know the high-level concept: it's about building these tagged structures to carry data within netlink messages, allowing for the flexible conveyance of information, and efficient handling of varying data payloads. But seeing the code directly always provides those subtle insights into optimization, error handling, and the overall design philosophy the developers adopted. I'm particularly interested in memory management nuances, alignment considerations, and how the attribute length is actually calculated and encoded. It's the nitty-gritty details that often expose the cleverness (or potential pitfalls) of a system. I'm also anticipating that it likely involves some clever pointer arithmetic and potential use of macros, so I'll be ready to unpack those as I go through the code!
129/3	2026/09/27 08:03	tool	grepper	0m Args: { "Expression": "int nla_put\\(", "PathPrefix": "lib/nlattr.c" } Results: { "Output": "lib/nlattr.c=1082=EXPORT_SYMBOL(__nla_put_nohdr);\n--\nlib/nlattr.c-1093- /\nlib/nlattr.c:1094:int nla_put(struct sk_buff skb, int attrtype, int attrlen, const void *data)\nlib/nlattr.c-1095-{\n" }
130/3	2026/09/27 08:03	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 4963 output: 35 thoughts: 19 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience: Diving into `lib/nlattr.c` Okay, time to dig into this. I'm going to jump straight to line 1094 in `lib/nlattr.c`. That area usually deals with... well, it depends on the context, but given the library's focus on Netlink attributes, I'm expecting something to do with attribute handling, validation, or perhaps even a specific attribute type processing. I'm betting it’s likely involved in either parsing incoming attributes or formatting attributes for outgoing messages, or perhaps error handling related to attributes. Line 1094... let's see what's happening there and what surrounding code offers clues. I need to get a grip on that particular function, and see what the flow looks like with the rest of the file.
131/3	2026/09/27 08:03	tool	read-file	0m Args: { "File": "lib/nlattr.c", "FirstLine": 1090, "LineCount": 30 } Results: { "Contents": "1090:\t \n1091:\t Returns -EMSGSIZE if the tailroom of the skb is insufficient to store\n1092:\t * the attribute header and payload.\n1093:\t /\n1094:\tint nla_put(struct sk_buff skb, int attrtype, int attrlen, const void data)\n1095:\t{\n1096:\t\tif (unlikely(skb_tailroom(skb) \u003c nla_total_size(attrlen)))\n1097:\t\t\treturn -EMSGSIZE;\n1098:\t\n1099:\t\t__nla_put(skb, attrtype, attrlen, data);\n1100:\t\treturn 0;\n1101:\t}\n1102:\tEXPORT_SYMBOL(nla_put);\n1103:\t\n1104:\t/\n1105:\t nla_put_64bit - Add a netlink attribute to a socket buffer and align it\n1106:\t * @skb: socket buffer to add attribute to\n1107:\t * @attrtype: attribute type\n1108:\t * @attrlen: length of attribute payload\n1109:\t * @data: head of attribute payload\n1110:\t * @padattr: attribute type for the padding\n1111:\t \n1112:\t Returns -EMSGSIZE if the tailroom of the skb is insufficient to store\n1113:\t * the attribute header and payload.\n1114:\t /\n1115:\tint nla_put_64bit(struct sk_buff skb, int attrtype, int attrlen,\n1116:\t\t\t const void *data, int padattr)\n1117:\t{\n1118:\t\tsize_t len;\n1119:\t\n" }
132/3	2026/09/27 08:03	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 5683 output: 33 thoughts: 14 Thoughts: Okay, let's dive into this. Here's my understanding, presented as my own mental processing: Analyzing `__nla_put` Function Alright, time to dissect this. My immediate thought is, "Let's figure out the function of this `__nla_put` thing." I need a comprehensive understanding of what it accomplishes. Knowing this will probably be key to understanding the surrounding code. My initial thought is it is part of a larger code base and is key to a larger system. I'll need to know what it "puts" into, why, and how. Let's get cracking.
133/3	2026/09/27 08:03	tool	grepper	0m Args: { "Expression": "void __nla_put\\(", "PathPrefix": "lib/nlattr.c" } Results: { "Output": "lib/nlattr.c=1023=EXPORT_SYMBOL(nla_reserve_nohdr);\n--\nlib/nlattr.c-1034- /\nlib/nlattr.c:1035:void __nla_put(struct sk_buff skb, int attrtype, int attrlen,\nlib/nlattr.c-1036-\t\t\t const void *data)\n" }
134/3	2026/09/27 08:03	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 5972 output: 35 thoughts: 11 Thoughts: Okay, here's my interpretation of that thought process, tailored for an expert audience, and written in the first person: Diving into `__nla_put` Right, let's get down to brass tacks. The objective is to grasp the workings of `__nla_put`. There's no time to dawdle. I know what's in the Netlink documentation, and I know what this needs to accomplish. I want to understand exactly how this function contributes to building Netlink messages, specifically how it handles the insertion of attribute data into the message buffer. What's the error checking like? How is the length calculation handled, and how does it deal with padding? Are there any subtle gotchas related to alignment, or potential off-by-one errors? I want to see the details. Specifically, I want to confirm my understanding of how it interfaces with the `nlmsghdr` and `nlattr` structures. Is it a simple struct copy, or is there more logic I should be aware of? I'm anticipating that memory management is important and I'd like to quickly check how the structure and order of the arguments facilitates the build process. I need to evaluate its potential impact on performance, considering the overhead of each attribute insertion, and how it handles dynamic attribute sizes. Finally, I want to assess whether it's thread-safe and safe for concurrent access across multiple Netlink socket connections.
135/3	2026/09/27 08:03	tool	read-file	0m Args: { "File": "lib/nlattr.c", "FirstLine": 1034, "LineCount": 25 } Results: { "Contents": "1034:\t /\n1035:\tvoid __nla_put(struct sk_buff skb, int attrtype, int attrlen,\n1036:\t\t\t\t const void data)\n1037:\t{\n1038:\t\tstruct nlattr nla;\n1039:\t\n1040:\t\tnla = __nla_reserve(skb, attrtype, attrlen);\n1041:\t\tmemcpy(nla_data(nla), data, attrlen);\n1042:\t}\n1043:\tEXPORT_SYMBOL(__nla_put);\n1044:\t\n1045:\t/*\n1046:\t __nla_put_64bit - Add a netlink attribute to a socket buffer and align it\n1047:\t * @skb: socket buffer to add attribute to\n1048:\t * @attrtype: attribute type\n1049:\t * @attrlen: length of attribute payload\n1050:\t * @data: head of attribute payload\n1051:\t * @padattr: attribute type for the padding\n1052:\t \n1053:\t The caller is responsible to ensure that the skb provides enough\n1054:\t * tailroom for the attribute header and payload.\n1055:\t /\n1056:\tvoid __nla_put_64bit(struct sk_buff skb, int attrtype, int attrlen,\n1057:\t\t\t const void *data, int padattr)\n1058:\t{\n" }
136/3	2026/09/27 08:03	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 6719 output: 34 thoughts: 12 Thoughts: Okay, here's my interpretation of that thought process, tailored for an expert audience, and written in the first person: Analyzing the `__nla_reserve` Function Alright, let's dive in and take a look at `__nla_reserve`. My initial thought is to quickly assess its purpose in the broader context. Given the naming convention with the double underscores, I immediately suspect this is a low-level, internal helper function. I'm already anticipating it deals with some aspect of Netlink attribute (NLA) management, likely related to reserving space for NLAs within a Netlink message buffer. I'm mentally preparing to check: * Memory Allocation: Is it allocating memory directly, or working with a pre-allocated buffer? What strategies are implemented to efficiently reserve space? Are any memory management details obvious? * Alignment Concerns: Netlink attributes typically require alignment. Does the function implicitly handle this alignment, or does it leave that responsibility to higher-level functions? I need to look closely for any bitwise operations or pointer manipulations related to this. * Error Handling: How does it deal with potential buffer overflow scenarios? Does it return an error code or trigger an assertion, if space cannot be reserved? What are the implications if I see an error return, or if it doesn't? * Usage Pattern: Quickly look at where it's called from. I'm expecting this function to be called from the core NLA functions. I can anticipate that I would see the call being initiated from where Netlink messages are constructed. * Optimization: Does it use any techniques like pre-calculating the required space, or caching any values? This gives away clues about any potential performance bottlenecks. Essentially, I'm mentally parsing the code to understand its role in ensuring efficient and correct attribute management within a Netlink message. My goal here is not to be surprised by its behavior, but to be prepared.
137/3	2026/09/27 08:03	tool	read-file	0m Args: { "File": "lib/nlattr.c", "FirstLine": 980, "LineCount": 40 } Results: { "Contents": " 980:\t * @attrlen: length of attribute payload\n 981:\t * @padattr: attribute type for the padding\n 982:\t \n 983:\t Adds a netlink attribute header to a socket buffer and reserves\n 984:\t * room for the payload but does not copy it. It also ensure that this\n 985:\t * attribute will have a 64-bit aligned nla_data() area.\n 986:\t \n 987:\t Returns NULL if the tailroom of the skb is insufficient to store\n 988:\t * the attribute header and payload.\n 989:\t /\n 990:\tstruct nlattr nla_reserve_64bit(struct sk_buff skb, int attrtype, int attrlen,\n 991:\t\t\t\t\t int padattr)\n 992:\t{\n 993:\t\tsize_t len;\n 994:\t\n 995:\t\tif (nla_need_padding_for_64bit(skb))\n 996:\t\t\tlen = nla_total_size_64bit(attrlen);\n 997:\t\telse\n 998:\t\t\tlen = nla_total_size(attrlen);\n 999:\t\tif (unlikely(skb_tailroom(skb) \u003c len))\n1000:\t\t\treturn NULL;\n1001:\t\n1002:\t\treturn __nla_reserve_64bit(skb, attrtype, attrlen, padattr);\n1003:\t}\n1004:\tEXPORT_SYMBOL(nla_reserve_64bit);\n1005:\t\n1006:\t/\n1007:\t nla_reserve_nohdr - reserve room for attribute without header\n1008:\t * @skb: socket buffer to reserve room on\n1009:\t * @attrlen: length of attribute payload\n1010:\t \n1011:\t Reserves room for attribute payload without a header.\n1012:\t \n1013:\t Returns NULL if the tailroom of the skb is insufficient to store\n1014:\t * the attribute payload.\n1015:\t /\n1016:\tvoid nla_reserve_nohdr(struct sk_buff *skb, int attrlen)\n1017:\t{\n1018:\t\tif (unlikely(skb_tailroom(skb) \u003c NLA_ALIGN(attrlen)))\n1019:\t\t\treturn NULL;\n" }
138/3	2026/09/27 08:03	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 7822 output: 34 thoughts: 20 Thoughts: Okay, let's dive into this. Here's my take on those lines of code: Analyzing `lib/nlattr.c` (Lines 950-980) Alright, so I'm looking at `lib/nlattr.c` and specifically lines 950 to 980. My immediate thought is, what are they doing in that particular section? Based on the surrounding code, I'm betting this part probably deals with the manipulation or processing of Netlink attributes. I need to quickly ascertain the function, the objective of the specific code fragment. I'll be looking for clues like: Is it a function definition or part of one? Does it involve memory allocation (likely candidates being `kmalloc`, `kzalloc`, or `malloc`)? Are there any pointers to structures being used, especially related to Netlink messages or attributes? Is there any bitwise logic (AND, OR, shift operators) that implies data packing, unpacking, or masking? Error handling is key, so I'll watch for return statements, conditions, or calls to `NL_SET_ERRNO`. I want to know if they're validating attribute lengths, unpacking data from a buffer, setting attributes, perhaps even iterating through a list of attributes. I need to quickly identify the flow of data and understand how it relates to the larger context of Netlink operations. It would be ideal if there are any comments that describe the purpose of the individual lines. I'll read with the assumption that I understand what is already happening, and am trying to understand the nuances of this specific fragment. I am expecting good variable names and standard coding practices. Based on the structure and content of this code, I'll start to form a comprehensive understanding. Ultimately, my goal is to assess its efficiency, correctness, and potential areas for improvement.
139/3	2026/09/27 08:03	tool	read-file	0m Args: { "File": "lib/nlattr.c", "FirstLine": 945, "LineCount": 35 } Results: { "Contents": " 945:\t \n 946:\t The caller is responsible to ensure that the skb provides enough\n 947:\t * tailroom for the payload.\n 948:\t /\n 949:\tvoid __nla_reserve_nohdr(struct sk_buff skb, int attrlen)\n 950:\t{\n 951:\t\treturn skb_put_zero(skb, NLA_ALIGN(attrlen));\n 952:\t}\n 953:\tEXPORT_SYMBOL(__nla_reserve_nohdr);\n 954:\t\n 955:\t/\n 956:\t nla_reserve - reserve room for attribute on the skb\n 957:\t * @skb: socket buffer to reserve room on\n 958:\t * @attrtype: attribute type\n 959:\t * @attrlen: length of attribute payload\n 960:\t \n 961:\t Adds a netlink attribute header to a socket buffer and reserves\n 962:\t * room for the payload but does not copy it.\n 963:\t \n 964:\t Returns NULL if the tailroom of the skb is insufficient to store\n 965:\t * the attribute header and payload.\n 966:\t /\n 967:\tstruct nlattr nla_reserve(struct sk_buff skb, int attrtype, int attrlen)\n 968:\t{\n 969:\t\tif (unlikely(skb_tailroom(skb) \u003c nla_total_size(attrlen)))\n 970:\t\t\treturn NULL;\n 971:\t\n 972:\t\treturn __nla_reserve(skb, attrtype, attrlen);\n 973:\t}\n 974:\tEXPORT_SYMBOL(nla_reserve);\n 975:\t\n 976:\t/\n 977:\t nla_reserve_64bit - reserve room for attribute on the skb and align it\n 978:\t * @skb: socket buffer to reserve room on\n 979:\t * @attrtype: attribute type\n" }
140/3	2026/09/27 08:03	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 8813 output: 32 thoughts: 15 Thoughts: Here's my take on those thoughts, tailored for an expert audience: Investigating the `__nla_reserve` Macro Okay, so I need to understand this `__nla_reserve` thing. My first instinct is always to jump straight to the source, right? I'm going to track down the definition of that macro. Knowing where it's defined will give me the immediate context. Is it a core kernel header? A specific Netlink-related header? That'll tell me right away if I'm dealing with attribute length calculations or a more general memory management concern. I'm assuming it relates to Netlink attribute (NLA) handling, given the naming convention, but I need to confirm that. Time to go hunting in the include directories... let's see where this rabbit hole leads.
141/3	2026/09/27 08:03	tool	grepper	0m Args: { "Expression": "__nla_reserve\\(", "PathPrefix": "lib/nlattr.c" } Results: { "Output": "lib/nlattr.c=887=EXPORT_SYMBOL(nla_strcmp);\n--\nlib/nlattr.c-901- /\nlib/nlattr.c:902:struct nlattr __nla_reserve(struct sk_buff skb, int attrtype, int attrlen)\nlib/nlattr.c-903-{\n--\nlib/nlattr.c=930=struct nlattr __nla_reserve_64bit(struct sk_buff skb, int attrtype,\n--\nlib/nlattr.c-934-\nlib/nlattr.c:935:\treturn __nla_reserve(skb, attrtype, attrlen);\nlib/nlattr.c-936-}\n--\nlib/nlattr.c=967=struct nlattr nla_reserve(struct sk_buff skb, int attrtype, int attrlen)\n--\nlib/nlattr.c-971-\nlib/nlattr.c:972:\treturn __nla_reserve(skb, attrtype, attrlen);\nlib/nlattr.c-973-}\n--\nlib/nlattr.c=1035=void __nla_put(struct sk_buff skb, int attrtype, int attrlen,\n--\nlib/nlattr.c-1039-\nlib/nlattr.c:1040:\tnla = __nla_reserve(skb, attrtype, attrlen);\nlib/nlattr.c-1041-\tmemcpy(nla_data(nla), data, attrlen);\n" }
142/3	2026/09/27 08:03	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 9435 output: 34 thoughts: 22 Thoughts: Okay, here's my interpretation of what's going on, formatted as you requested: Delving into `lib/nlattr.c` - Lines 900-925 Alright, I'm heading into `lib/nlattr.c` now, specifically focusing on lines 900 through 925. This section must be crucial for something, probably dealing with netlink attribute handling. I bet I'll find some core functionality here, maybe related to parsing, validation, or even the construction of Netlink messages themselves. I anticipate seeing the mechanics of how data is added, extracted, and managed within the attributes. Based on the file name, `nlattr.c`, I'm likely examining the heart of the netlink attribute library. I'm keen to see the details. Let's dig in. I will pay close attention to the data structures involved; they'll hold the key to understanding the underlying design. The function names in this area will, no doubt, guide me, but I'll focus on the data flow and how it aligns with the Netlink protocol.
143/3	2026/09/27 08:03	tool	read-file	0m Args: { "File": "lib/nlattr.c", "FirstLine": 900, "LineCount": 30 } Results: { "Contents": " 900:\t * tailroom for the attribute header and payload.\n 901:\t /\n 902:\tstruct nlattr __nla_reserve(struct sk_buff skb, int attrtype, int attrlen)\n 903:\t{\n 904:\t\tstruct nlattr nla;\n 905:\t\n 906:\t\tnla = skb_put(skb, nla_total_size(attrlen));\n 907:\t\tnla-\u003enla_type = attrtype;\n 908:\t\tnla-\u003enla_len = nla_attr_size(attrlen);\n 909:\t\n 910:\t\tmemset((unsigned char ) nla + nla-\u003enla_len, 0, nla_padlen(attrlen));\n 911:\t\n 912:\t\treturn nla;\n 913:\t}\n 914:\tEXPORT_SYMBOL(__nla_reserve);\n 915:\t\n 916:\t/\n 917:\t __nla_reserve_64bit - reserve room for attribute on the skb and align it\n 918:\t * @skb: socket buffer to reserve room on\n 919:\t * @attrtype: attribute type\n 920:\t * @attrlen: length of attribute payload\n 921:\t * @padattr: attribute type for the padding\n 922:\t \n 923:\t Adds a netlink attribute header to a socket buffer and reserves\n 924:\t * room for the payload but does not copy it. It also ensure that this\n 925:\t * attribute will have a 64-bit aligned nla_data() area.\n 926:\t \n 927:\t The caller is responsible to ensure that the skb provides enough\n 928:\t * tailroom for the attribute header and payload.\n 929:\t */\n" }
144/3	2026/09/27 08:03	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 10220 output: 34 thoughts: 705 Thoughts: Analyzing Potential Netlink Attribute Overflow Okay, let's break this down. I see the `__nla_reserve` function in the C code, and then the use of `__nla_put`. Specifically, `__nla_reserve` allocates space in the `sk_buff` and sets the `nla_len` field. Then, `__nla_put` copies data into that reserved space. The Rust code is doing something equivalent, but there's a safety check being added. Ah, I remember the issue now – the Rust patch addresses a potential overflow in the `nla_len` field. Looking at the commit, it introduces `MAX_PAYLOAD_LEN`, which calculates the maximum payload size that can fit within a 16-bit `nla_len` field. The core idea is: * The `nla_len` field, being a `__u16`, has a maximum value. * The total attribute length (`nla_len`) is header size + payload size. * If the payload size (`len`) exceeds `u16::MAX - sizeof(nlattr)`, there's an integer overflow when calculating `nla_len`. If the length check wasn't present, then the `nla_len` field, set by `nla_attr_size(attrlen)` in the C code, would wrap around. The critical question becomes what happens when `nla_len` is truncated, and specifically how would this affect the `skb`'s tailroom checks, and any other length checks within the kernel? I see that `nla_attr_size(attrlen)` is used to calculate the length, so let me quickly check where `nla_total_size` is defined since it is also in use. I remember that the definitions are in `include/net/netlink.h`, so I'll quickly look there...
145/3	2026/09/27 08:03	tool	grepper	0m Args: { "Expression": "nla_total_size", "PathPrefix": "include/net/netlink.h" } Results: { "Output": "include/net/netlink.h-81- * Attribute Format:\ninclude/net/netlink.h:82: * \u003c------- nla_total_size(payload) -------\u003e\ninclude/net/netlink.h-83- * \u003c---- nla_attr_size(payload) -----\u003e\n--\ninclude/net/netlink.h-126- * nla_attr_size(payload)\t\tlength of attribute w/o padding\ninclude/net/netlink.h:127: * nla_total_size(payload)\t\tlength of attribute w/ padding\ninclude/net/netlink.h-128- * nla_padlen(payload)\t\tlength of padding\n--\ninclude/net/netlink.h=1249=static inline int nla_attr_size(int payload)\n--\ninclude/net/netlink.h-1254-/*\ninclude/net/netlink.h:1255: nla_total_size - total length of attribute including padding\ninclude/net/netlink.h-1256- * @payload: length of payload\ninclude/net/netlink.h-1257- /\ninclude/net/netlink.h:1258:static inline int nla_total_size(int payload)\ninclude/net/netlink.h-1259-{\n--\ninclude/net/netlink.h=1267=static inline int nla_padlen(int payload)\ninclude/net/netlink.h-1268-{\ninclude/net/netlink.h:1269:\treturn nla_total_size(payload) - nla_attr_size(payload);\ninclude/net/netlink.h-1270-}\n--\ninclude/net/netlink.h=2390=static inline int nla_align_64bit(struct sk_buff skb, int padattr)\n--\ninclude/net/netlink.h-2399-/*\ninclude/net/netlink.h:2400: nla_total_size_64bit - total length of attribute including padding\ninclude/net/netlink.h-2401- * @payload: length of payload\ninclude/net/netlink.h-2402- */\ninclude/net/netlink.h:2403:static inline int nla_total_size_64bit(int payload)\ninclude/net/netlink.h-2404-{\n" }
146/3	2026/09/27 08:03	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 11988 output: 37 thoughts: 23 Thoughts: Here's my summary, as if I were thinking these thoughts: Analyzing `nla_total_size` in `net/netlink.h` Okay, let's dive into this. I'm going to take a closer look at `nla_total_size` within `include/net/netlink.h`. I need to refresh my memory on the specifics of this macro. It's a key part of how Netlink attributes are handled, and a thorough understanding here is crucial for dissecting the memory layout and sizes involved in Netlink messages. I need to be sure I'm solid on how it's used to calculate the total size of a Netlink attribute list. Time to refresh my knowledge of the mechanics.
147/3	2026/09/27 08:03	tool	read-file	0m Args: { "File": "include/net/netlink.h", "FirstLine": 1245, "LineCount": 35 } Results: { "Contents": "1245:\t/*\n1246:\t nla_attr_size - length of attribute not including padding\n1247:\t * @payload: length of payload\n1248:\t /\n1249:\tstatic inline int nla_attr_size(int payload)\n1250:\t{\n1251:\t\treturn NLA_HDRLEN + payload;\n1252:\t}\n1253:\t\n1254:\t/\n1255:\t nla_total_size - total length of attribute including padding\n1256:\t * @payload: length of payload\n1257:\t /\n1258:\tstatic inline int nla_total_size(int payload)\n1259:\t{\n1260:\t\treturn NLA_ALIGN(nla_attr_size(payload));\n1261:\t}\n1262:\t\n1263:\t/\n1264:\t nla_padlen - length of padding at the tail of attribute\n1265:\t * @payload: length of payload\n1266:\t /\n1267:\tstatic inline int nla_padlen(int payload)\n1268:\t{\n1269:\t\treturn nla_total_size(payload) - nla_attr_size(payload);\n1270:\t}\n1271:\t\n1272:\t/\n1273:\t nla_type - attribute type\n1274:\t * @nla: netlink attribute\n1275:\t /\n1276:\tstatic inline int nla_type(const struct nlattr nla)\n1277:\t{\n1278:\t\treturn nla-\u003enla_type \u0026 NLA_TYPE_MASK;\n1279:\t}\n" }
148/3	2026/09/27 08:03	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 12675 output: 24 thoughts: 519 Thoughts: Analyzing Potential Integer Overflow Vulnerability in Netlink Attribute Handling Okay, let's break this down. My initial thought is to probe the limits of the `payload` size, specifically what happens when it's greater than 65535 minus a small offset, like 65531. I'm thinking about the potential for integer overflow in the Netlink attribute handling, both in C and now in Rust. In C, `nla_put` takes `attrlen` as an `int`. The function `nla_attr_size(attrlen)` calculates the total attribute size as 4 + `attrlen`. Crucially, `nla->nla_len` is a `__u16`, a 16-bit unsigned integer. So, if `attrlen` is large (greater than 65531), the calculation of `nla_attr_size(attrlen)` could result in a value that, when assigned to `nla->nla_len`, truncates due to the `__u16` type. The same thing can occur in Rust, where `len as c_int` could overflow if `len > c_int::MAX`. If this truncation happens, `nla->nla_len` becomes smaller than the intended total size, `nla_total_size(attrlen)`. This discrepancy then has a dangerous consequence: the subsequent call to `memset` could write to an incorrect memory offset. Specifically, `memset((unsigned char ) nla + nla->nla_len, 0, nla_padlen(attrlen));` would overwrite memory beyond the intended attribute buffer, potentially leading to a buffer overflow or other memory corruption. Wait, I need to clarify what the patch actually does. Is this patch the fix or the cause? Looking at the patch, I see they've added a bounds check in Rust: `if len > MAX_PAYLOAD_LEN { return Err(EMSGSIZE); }`. Ah, so this patch is fixing* the potential problem! They're explicitly calculating `MAX_PAYLOAD_LEN` as `u16::MAX` minus the size of the Netlink attribute header, `size_of::<bindings::nlattr>()`. This check prevents sending attributes larger than can be accommodated by the `nla->nla_len` field. This is good. It's a preventative measure against the potential integer overflow and subsequent out-of-bounds writes. Now, I should confirm where `rust/kernel/net/netlink.rs` is used in the kernel. Knowing the callers will help me determine the breadth of this potential vulnerability and the effectiveness of this fix.
149/3	2026/09/27 08:03	tool	grepper	0m Args: { "Expression": "netlink", "PathPrefix": "rust/" } Results: { "Output": "rust/bindings/bindings_helper.h-97-#include \u003clinux/xarray.h\u003e\nrust/bindings/bindings_helper.h:98:#include \u003cnet/genetlink.h\u003e\nrust/bindings/bindings_helper.h:99:#include \u003cnet/netlink.h\u003e\nrust/bindings/bindings_helper.h-100-#include \u003ctrace/events/rust_sample.h\u003e\n--\nrust/helpers/helpers.c-77-#include \"mutex.c\"\nrust/helpers/helpers.c:78:#include \"net/genetlink.c\"\nrust/helpers/helpers.c-79-#include \"of.c\"\n--\nrust/helpers/net/genetlink.c-6-\nrust/helpers/net/genetlink.c:7:#include \u003cnet/genetlink.h\u003e\nrust/helpers/net/genetlink.c-8-\n--\nrust/kernel/net/mod.rs-7-\nrust/kernel/net/mod.rs:8:pub mod netlink;\n--\nrust/kernel/net/netlink.rs-4-\nrust/kernel/net/netlink.rs:5://! Rust support for generic netlink.\nrust/kernel/net/netlink.rs-6-//!\n--\nrust/kernel/net/netlink.rs-8-//!\nrust/kernel/net/netlink.rs:9://! C header: [`include/net/genetlink.h`](srctree/include/net/genetlink.h)\nrust/kernel/net/netlink.rs-10-\n--\nrust/kernel/net/netlink.rs-25-\nrust/kernel/net/netlink.rs:26:/// The default netlink message size.\nrust/kernel/net/netlink.rs-27-pub const GENLMSG_DEFAULT_SIZE: usize = bindings::GENLMSG_DEFAULT_SIZE;\nrust/kernel/net/netlink.rs-28-\nrust/kernel/net/netlink.rs:29:/// A wrapper around `struct sk_buff` for generic netlink messages.\nrust/kernel/net/netlink.rs-30-///\nrust/kernel/net/netlink.rs:31:/// This type is intended to be specific for buffers used with netlink only, and other usecases for\nrust/kernel/net/netlink.rs-32-/// `struct sk_buff` are out-of-scope for this abstraction.\n--\nrust/kernel/net/netlink.rs=43= pub fn new(size: usize, flags: alloc::Flags) -\u003e Result\u003cNetlinkSkBuff, AllocError\u003e {\n--\nrust/kernel/net/netlink.rs-49-\nrust/kernel/net/netlink.rs:50: /// Puts a generic netlink header into the `NetlinkSkBuff`.\nrust/kernel/net/netlink.rs-51- pub fn genlmsg_put(\n--\nrust/kernel/net/netlink.rs=67= fn drop(\u0026mut self) {\n--\nrust/kernel/net/netlink.rs-72-\nrust/kernel/net/netlink.rs:73:/// A generic netlink message being constructed.\nrust/kernel/net/netlink.rs-74-///\n--\nrust/kernel/net/netlink.rs-76-///\nrust/kernel/net/netlink.rs:77:/// `hdr` references the header in this netlink message.\nrust/kernel/net/netlink.rs-78-pub struct GenlMsg {\n--\nrust/kernel/net/netlink.rs=120= pub fn put_flag(\u0026mut self, attrtype: c_int) -\u003e Result {\n--\nrust/kernel/net/netlink.rs-126-\nrust/kernel/net/netlink.rs:127: /// Sends the generic netlink message as a multicast message.\nrust/kernel/net/netlink.rs-128- #[inline]\n--\nrust/kernel/net/netlink.rs=152= fn drop(\u0026mut self) {\nrust/kernel/net/netlink.rs:153: // SAFETY: The `hdr` pointer references the header of this generic netlink message.\nrust/kernel/net/netlink.rs-154- unsafe { bindings::genlmsg_cancel(self.skb.skb.as_ptr(), self.hdr.as_ptr()) };\n--\nrust/kernel/net/netlink.rs-157-\nrust/kernel/net/netlink.rs:158:/// Flags for a generic netlink family.\nrust/kernel/net/netlink.rs-159-struct FamilyFlags {\n--\nrust/kernel/net/netlink.rs=166=impl FamilyFlags {\n--\nrust/kernel/net/netlink.rs-187-\nrust/kernel/net/netlink.rs:188:/// A generic netlink family.\nrust/kernel/net/netlink.rs-189-#[repr(transparent)]\n--\nrust/kernel/net/netlink.rs=251= pub fn as_raw(\u0026self) -\u003e *mut bindings::genl_family {\n--\nrust/kernel/net/netlink.rs-255-\nrust/kernel/net/netlink.rs:256:/// A generic netlink multicast group.\nrust/kernel/net/netlink.rs-257-#[repr(transparent)]\n--\nrust/kernel/net/netlink.rs=270= pub const fn const_new(name: \u0026CStr) -\u003e MulticastGroup {\n--\nrust/kernel/net/netlink.rs-286-\nrust/kernel/net/netlink.rs:287:/// A registration of a generic netlink family.\nrust/kernel/net/netlink.rs-288-///\nrust/kernel/net/netlink.rs-289-/// This type represents the registration of a [`Family`]. When an instance of this type is\nrust/kernel/net/netlink.rs:290:/// dropped, its respective generic netlink family will be unregistered from the system.\nrust/kernel/net/netlink.rs-291-///\n--\nrust/kernel/net/netlink.rs=299=impl Family {\nrust/kernel/net/netlink.rs:300: /// Registers the generic netlink family with the kernel.\nrust/kernel/net/netlink.rs-301- pub fn register(\u0026'static self) -\u003e Result\u003cRegistration\u003e {\n--\nrust/kernel/net/netlink.rs=310= fn drop(\u0026mut self) {\n--\nrust/kernel/net/netlink.rs-317-\nrust/kernel/net/netlink.rs:318:#[macros::kunit_tests(rust_netlink)]\nrust/kernel/net/netlink.rs-319-mod tests {\n--\nrust/uapi/uapi_helper.h-12-#include \u003cuapi/linux/android/binder.h\u003e\nrust/uapi/uapi_helper.h:13:#include \u003cuapi/linux/android/binder_netlink.h\u003e\nrust/uapi/uapi_helper.h-14-#include \u003cuapi/linux/ioctl.h\u003e\n" }
150/3	2026/09/27 08:03	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 15549 output: 36 thoughts: 25 Thoughts: Okay, here's my understanding, assuming I'm an expert in this field, presented as a first-person thought process: Diving Deeper into `rust/kernel/net/netlink.rs` Alright, I need the full picture here. I can't just look at this snippet in isolation. To truly grasp the implications and functionality of this particular code, I need to see the rest of `rust/kernel/net/netlink.rs`. Only by examining the surrounding code – the surrounding functions, the data structures, the overall flow of control – can I understand its context within the Netlink implementation. I'm especially interested in how this integrates with the kernel's Netlink message handling. There's no point in making any real judgements without the full details!
151/3	2026/09/27 08:03	tool	read-file	0m Args: { "File": "rust/kernel/net/netlink.rs", "FirstLine": 1, "LineCount": 60 } Results: { "Contents": " 1:\t// SPDX-License-Identifier: GPL-2.0\n 2:\t\n 3:\t// Copyright (C) 2026 Google LLC.\n 4:\t\n 5:\t//! Rust support for generic netlink.\n 6:\t//!\n 7:\t//! Currently only supports exposing multicast groups.\n 8:\t//!\n 9:\t//! C header: [`include/net/genetlink.h`](srctree/include/net/genetlink.h)\n 10:\t\n 11:\tuse kernel::{\n 12:\t alloc::{self, AllocError},\n 13:\t error::to_result,\n 14:\t num::casts::u16_as_usize,\n 15:\t prelude::*,\n 16:\t transmute::AsBytes,\n 17:\t types::Opaque,\n 18:\t ThisModule,\n 19:\t};\n 20:\t\n 21:\tuse core::{\n 22:\t mem::ManuallyDrop,\n 23:\t ptr::NonNull, //\n 24:\t};\n 25:\t\n 26:\t/// The default netlink message size.\n 27:\tpub const GENLMSG_DEFAULT_SIZE: usize = bindings::GENLMSG_DEFAULT_SIZE;\n 28:\t\n 29:\t/// A wrapper around `struct sk_buff` for generic netlink messages.\n 30:\t///\n 31:\t/// This type is intended to be specific for buffers used with netlink only, and other usecases for\n 32:\t/// `struct sk_buff` are out-of-scope for this abstraction.\n 33:\t///\n 34:\t/// # Invariants\n 35:\t///\n 36:\t/// The pointer has ownership over a valid `sk_buff`.\n 37:\tpub struct NetlinkSkBuff {\n 38:\t skb: NonNull\u003ckernel::bindings::sk_buff\u003e,\n 39:\t}\n 40:\t\n 41:\timpl NetlinkSkBuff {\n 42:\t /// Creates a new `NetlinkSkBuff` with the given size.\n 43:\t pub fn new(size: usize, flags: alloc::Flags) -\u003e Result\u003cNetlinkSkBuff, AllocError\u003e {\n 44:\t // SAFETY: `genlmsg_new` only requires its arguments to be valid integers.\n 45:\t let skb = unsafe { bindings::genlmsg_new(size, flags.as_raw()) };\n 46:\t let skb = NonNull::new(skb).ok_or(AllocError)?;\n 47:\t Ok(NetlinkSkBuff { skb })\n 48:\t }\n 49:\t\n 50:\t /// Puts a generic netlink header into the `NetlinkSkBuff`.\n 51:\t pub fn genlmsg_put(\n 52:\t self,\n 53:\t portid: u32,\n 54:\t seq: u32,\n 55:\t family: \u0026'static Family,\n 56:\t cmd: u8,\n 57:\t ) -\u003e Result\u003cGenlMsg, AllocError\u003e {\n 58:\t let skb = self.skb.as_ptr();\n 59:\t // SAFETY: The skb and family pointers are valid.\n 60:\t let hdr = unsafe { bindings::genlmsg_put(skb, portid, seq, family.as_raw(), 0, cmd) };\n" }
152/3	2026/09/27 08:03	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 16667 output: 38 thoughts: 29 Thoughts: Okay, let's dive into this. Here's my perspective on examining those Netlink files: Analyzing `rust/kernel/net/netlink.rs` and Tests (Lines 80-155) Alright, so the task at hand is to scrutinize lines 80 through 155 of that `netlink.rs` file within the kernel's network module, and, importantly, the associated tests. This suggests we're likely dealing with a specific functionality or subsystem within the Netlink implementation. Based on the line numbers, I'd wager it's a critical section, perhaps related to message parsing, socket operations, attribute handling, or maybe even error management. I need to refresh my mental map of how the Netlink protocol is architected within this particular kernel environment. First thing is to quickly scan those lines and the tests, getting the lay of the land, identifying the main functions or structures involved. I'll be looking for things like: are there any potential race conditions? Is the error handling robust? Are the test cases comprehensive and covering all the edge cases? I'll also be considering performance: are there any obvious bottlenecks, memory allocation concerns, or inefficient data structures that the tests reveal? I'll also be trying to relate the code to the design and implementation principles I would expect to see in that part of the system. Let's see if the authors were thinking like me, and if not, how might I suggest alternative, or improvements. The tests are crucial; they are my primary source of truth for understanding the intended behavior. I'll need to examine them to see if the tests are testing the proper behaviors of the code, and if they're written in a test-driven manner, if not, I'll recommend the implementation of new tests. Ultimately, I'm expecting to find a clear, well-documented, and performant implementation that adheres to best practices for kernel-level networking code. Let's dig in.
153/3	2026/09/27 08:03	tool	read-file	0m Args: { "File": "rust/kernel/net/netlink.rs", "FirstLine": 120, "LineCount": 60 } Results: { "Contents": " 120:\t pub fn put_flag(\u0026mut self, attrtype: c_int) -\u003e Result {\n 121:\t let skb = self.skb.skb.as_ptr();\n 122:\t // SAFETY: `skb` is valid by `NetlinkSkBuff` type invariants, and a null pointer is valid\n 123:\t // when the length is zero.\n 124:\t to_result(unsafe { bindings::nla_put(skb, attrtype, 0, core::ptr::null()) })\n 125:\t }\n 126:\t\n 127:\t /// Sends the generic netlink message as a multicast message.\n 128:\t #[inline]\n 129:\t pub fn multicast(\n 130:\t self,\n 131:\t family: \u0026'static Family,\n 132:\t portid: u32,\n 133:\t group: u32,\n 134:\t flags: alloc::Flags,\n 135:\t ) -\u003e Result {\n 136:\t let me = ManuallyDrop::new(self);\n 137:\t // SAFETY: The `skb` and `family` pointers are valid. We pass ownership of the `skb` to\n 138:\t // `genlmsg_multicast` by not dropping `self`.\n 139:\t unsafe {\n 140:\t bindings::genlmsg_end(me.skb.skb.as_ptr(), me.hdr.as_ptr());\n 141:\t to_result(bindings::genlmsg_multicast(\n 142:\t family.as_raw(),\n 143:\t me.skb.skb.as_ptr(),\n 144:\t portid,\n 145:\t group,\n 146:\t flags.as_raw(),\n 147:\t ))\n 148:\t }\n 149:\t }\n 150:\t}\n 151:\timpl Drop for GenlMsg {\n 152:\t fn drop(\u0026mut self) {\n 153:\t // SAFETY: The `hdr` pointer references the header of this generic netlink message.\n 154:\t unsafe { bindings::genlmsg_cancel(self.skb.skb.as_ptr(), self.hdr.as_ptr()) };\n 155:\t }\n 156:\t}\n 157:\t\n 158:\t/// Flags for a generic netlink family.\n 159:\tstruct FamilyFlags {\n 160:\t /// Whether the family supports network namespaces.\n 161:\t netnsok: bool,\n 162:\t /// Whether the family supports parallel operations.\n 163:\t parallel_ops: bool,\n 164:\t}\n 165:\t\n 166:\timpl FamilyFlags {\n 167:\t /// Converts the flags to the bitfield representation used by `genl_family`.\n 168:\t const fn into_bitfield(self) -\u003e bindings::__BindgenBitfieldUnit\u003c[u8; 1]\u003e {\n 169:\t // The below shifts are verified correct by test_family_flags_bitfield() below.\n 170:\t //\n 171:\t // Although bindgen generates helpers to change bitfields based on the C headers, these\n 172:\t // helpers unfortunately can't be used in const context. Since `Family` needs to be filled\n 173:\t // out at build-time, we use this helper instead.\n 174:\t let mut bits = 0;\n 175:\t if self.netnsok {\n 176:\t bits \|= 1 \u003c\u003c 0;\n 177:\t }\n 178:\t if self.parallel_ops {\n 179:\t bits \|= 1 \u003c\u003c 1;\n" }
154/3	2026/09/27 08:03	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 18168 output: 38 thoughts: 19 Thoughts: Okay, let's dive into the rest of `rust/kernel/net/netlink.rs`. Here's what I'm thinking: Examining the Netlink Implementation Alright, I need to understand this Netlink implementation within the kernel space, specifically the Rust version. I'm already familiar with Netlink in general, so I'm looking for the nuances of its implementation in Rust, and within this kernel context. I want to see how they're handling message parsing, socket creation and management, error handling, and the overall architecture. I'm especially interested in how they've dealt with Rust's ownership and borrowing rules within a potentially asynchronous environment. Things like memory safety and concurrency are critical here. I expect there to be clever use of data structures and abstractions to ensure efficient and safe interaction with the Netlink protocol. I want to identify any clever tricks or trade-offs that were made in the design. I'm also looking for common kernel idioms being employed, and how they map to the Rust ecosystem. Finally, I'll be keeping an eye out for any potential areas of concern, or things I might suggest improving, based on my deep experience with kernel programming. Let's see how they've put it all together.
155/3	2026/09/27 08:03	tool	read-file	0m Args: { "File": "rust/kernel/net/netlink.rs", "FirstLine": 315, "LineCount": 60 } Results: { "Contents": " 315:\t }\n 316:\t}\n 317:\t\n 318:\t#[macros::kunit_tests(rust_netlink)]\n 319:\tmod tests {\n 320:\t use super::*;\n 321:\t\n 322:\t #[test]\n 323:\t fn test_family_flags_bitfield() {\n 324:\t for netnsok in [false, true] {\n 325:\t for parallel_ops in [false, true] {\n 326:\t let mut b_fam = bindings::genl_family {\n 327:\t ..Default::default()\n 328:\t };\n 329:\t b_fam.set_netnsok(if netnsok { 1 } else { 0 });\n 330:\t b_fam.set_parallel_ops(if parallel_ops { 1 } else { 0 });\n 331:\t\n 332:\t let c_bitfield = FamilyFlags {\n 333:\t netnsok,\n 334:\t parallel_ops,\n 335:\t }\n 336:\t .into_bitfield();\n 337:\t\n 338:\t // SAFETY: The bit field is stored as u8.\n 339:\t let b_val: u8 = unsafe { core::mem::transmute(b_fam._bitfield_1) };\n 340:\t // SAFETY: The bit field is stored as u8.\n 341:\t let c_val: u8 = unsafe { core::mem::transmute(c_bitfield) };\n 342:\t assert_eq!(b_val, c_val);\n 343:\t }\n 344:\t }\n 345:\t }\n 346:\t}\n" }
156/3	2026/09/27 08:03	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 18984 output: 25 thoughts: 24 Thoughts: Okay, here's my attempt at summarizing that thought process, keeping in mind the expert user and the first-person perspective: Hunting Down the Source: GenlMsg and NetlinkSkBuff Alright, time to get to work. I need to understand the flow related to `GenlMsg` and `NetlinkSkBuff`. Where are they really being used within the kernel? Just knowing the header files isn't enough; I need to trace the call paths. So, I'm thinking, time to crack open the kernel tree and start searching. Specifically, I'll be looking for where these structures are called. Seeing the context of the calls will be the key to understanding how they're used. Let's see what we can dig up.
157/3	2026/09/27 08:03	tool	grepper	0m Args: { "Expression": "GenlMsg", "PathPrefix": "rust/" } Results: { "Output": "rust/kernel/net/netlink.rs=51= pub fn genlmsg_put(\n--\nrust/kernel/net/netlink.rs-56- cmd: u8,\nrust/kernel/net/netlink.rs:57: ) -\u003e Result\u003cGenlMsg, AllocError\u003e {\nrust/kernel/net/netlink.rs-58- let skb = self.skb.as_ptr();\n--\nrust/kernel/net/netlink.rs-61- let hdr = NonNull::new(hdr).ok_or(AllocError)?;\nrust/kernel/net/netlink.rs:62: Ok(GenlMsg { skb: self, hdr })\nrust/kernel/net/netlink.rs-63- }\n--\nrust/kernel/net/netlink.rs=67= fn drop(\u0026mut self) {\n--\nrust/kernel/net/netlink.rs-77-/// `hdr` references the header in this netlink message.\nrust/kernel/net/netlink.rs:78:pub struct GenlMsg {\nrust/kernel/net/netlink.rs-79- skb: NetlinkSkBuff,\n--\nrust/kernel/net/netlink.rs-82-\nrust/kernel/net/netlink.rs:83:impl GenlMsg {\nrust/kernel/net/netlink.rs-84- /// Puts an attribute into the message.\n--\nrust/kernel/net/netlink.rs=129= pub fn multicast(\n--\nrust/kernel/net/netlink.rs-150-}\nrust/kernel/net/netlink.rs:151:impl Drop for GenlMsg {\nrust/kernel/net/netlink.rs-152- fn drop(\u0026mut self) {\n" }
158/3	2026/09/27 08:03	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 19644 output: 27 thoughts: 24 Thoughts: Here's my thought process, summarized as you requested: Codebase Dive for Netlink Usage Okay, time to get my hands dirty. I need to understand the current landscape of our Netlink implementation. My first step is to perform a comprehensive search across the entire codebase. I'm going to look for any instances of `netlink::` specifically, as that's the obvious starting point. Beyond that, I need to expand my search to include any usages of Rust Netlink libraries or related functionalities. This search has to be broad to catch all relevant files. I'm expecting to find a lot, but I need a complete picture before I can formulate a plan. I want to see how we're currently approaching Netlink, identify any potential conflicts or inconsistencies, and understand the scope of what we have. It’s an essential first step.
159/3	2026/09/27 08:03	tool	grepper	0m Args: { "Expression": "put_u32\|put_string\|put_flag" } Results: { "Output": "\nFull output is too long, showing 500 out of 10891 lines.\nUse more precise expression if possible.\n\nDocumentation/networking/l2tp.rst=260=Sample userspace code using libmnl_:\n--\nDocumentation/networking/l2tp.rst-285-\nDocumentation/networking/l2tp.rst:286: mnl_attr_put_u32(nlh, L2TP_ATTR_FD, tunl_sock_fd);\nDocumentation/networking/l2tp.rst:287: mnl_attr_put_u32(nlh, L2TP_ATTR_CONN_ID, tid);\nDocumentation/networking/l2tp.rst:288: mnl_attr_put_u32(nlh, L2TP_ATTR_PEER_CONN_ID, peer_tid);\nDocumentation/networking/l2tp.rst-289- mnl_attr_put_u8(nlh, L2TP_ATTR_PROTO_VERSION, protocol_version);\n--\nDocumentation/networking/l2tp.rst-306-\nDocumentation/networking/l2tp.rst:307: mnl_attr_put_u32(nlh, L2TP_ATTR_CONN_ID, tid);\nDocumentation/networking/l2tp.rst:308: mnl_attr_put_u32(nlh, L2TP_ATTR_PEER_CONN_ID, peer_tid);\nDocumentation/networking/l2tp.rst:309: mnl_attr_put_u32(nlh, L2TP_ATTR_SESSION_ID, sid);\nDocumentation/networking/l2tp.rst:310: mnl_attr_put_u32(nlh, L2TP_ATTR_PEER_SESSION_ID, peer_sid);\nDocumentation/networking/l2tp.rst-311- mnl_attr_put_u16(nlh, L2TP_ATTR_PW_TYPE, pwtype);\n--\nDocumentation/networking/l2tp.rst-330-\nDocumentation/networking/l2tp.rst:331: mnl_attr_put_u32(nlh, L2TP_ATTR_CONN_ID, tid);\nDocumentation/networking/l2tp.rst:332: mnl_attr_put_u32(nlh, L2TP_ATTR_SESSION_ID, sid);\nDocumentation/networking/l2tp.rst-333-\n--\nDocumentation/networking/l2tp.rst-348-\nDocumentation/networking/l2tp.rst:349: mnl_attr_put_u32(nlh, L2TP_ATTR_CONN_ID, tid);\nDocumentation/networking/l2tp.rst-350-\n--\narch/powerpc/include/asm/guest-state-buffer.h=570=static inline int kvmppc_gse_put_be32(struct kvmppc_gs_buff gsb, u16 iden,\n--\narch/powerpc/include/asm/guest-state-buffer.h-579-/\narch/powerpc/include/asm/guest-state-buffer.h:580: kvmppc_gse_put_u32() - add a host endian 32bit int guest state element to a\narch/powerpc/include/asm/guest-state-buffer.h-581- * buffer\n--\narch/powerpc/include/asm/guest-state-buffer.h-585- /\narch/powerpc/include/asm/guest-state-buffer.h:586:static inline int kvmppc_gse_put_u32(struct kvmppc_gs_buff gsb, u16 iden,\narch/powerpc/include/asm/guest-state-buffer.h-587-\t\t\t\t u32 val)\n--\narch/powerpc/include/asm/guest-state-buffer.h=638=static inline int __kvmppc_gse_put_reg(struct kvmppc_gs_buff gsb, u16 iden,\n--\narch/powerpc/include/asm/guest-state-buffer.h-651-\narch/powerpc/include/asm/guest-state-buffer.h:652:\t\treturn kvmppc_gse_put_u32(gsb, iden, tmp);\narch/powerpc/include/asm/guest-state-buffer.h-653-\t}\n--\narch/powerpc/kvm/book3s_hv_nestedv2.c=140=static int gs_msg_ops_vcpu_fill_info(struct kvmppc_gs_buff gsb,\n--\narch/powerpc/kvm/book3s_hv_nestedv2.c-196-\t\tcase KVMPPC_GSID_DAWRX0:\narch/powerpc/kvm/book3s_hv_nestedv2.c:197:\t\t\trc = kvmppc_gse_put_u32(gsb, iden, vcpu-\u003earch.dawrx0);\narch/powerpc/kvm/book3s_hv_nestedv2.c-198-\t\t\tbreak;\narch/powerpc/kvm/book3s_hv_nestedv2.c-199-\t\tcase KVMPPC_GSID_DAWRX1:\narch/powerpc/kvm/book3s_hv_nestedv2.c:200:\t\t\trc = kvmppc_gse_put_u32(gsb, iden, vcpu-\u003earch.dawrx1);\narch/powerpc/kvm/book3s_hv_nestedv2.c-201-\t\t\tbreak;\n--\narch/powerpc/kvm/book3s_hv_nestedv2.c-214-\t\tcase KVMPPC_GSID_WORT:\narch/powerpc/kvm/book3s_hv_nestedv2.c:215:\t\t\trc = kvmppc_gse_put_u32(gsb, iden, vcpu-\u003earch.wort);\narch/powerpc/kvm/book3s_hv_nestedv2.c-216-\t\t\tbreak;\n--\narch/powerpc/kvm/book3s_hv_nestedv2.c-220-\t\tcase KVMPPC_GSID_PSPB:\narch/powerpc/kvm/book3s_hv_nestedv2.c:221:\t\t\trc = kvmppc_gse_put_u32(gsb, iden, vcpu-\u003earch.pspb);\narch/powerpc/kvm/book3s_hv_nestedv2.c-222-\t\t\tbreak;\n--\narch/powerpc/kvm/book3s_hv_nestedv2.c-244-\t\tcase KVMPPC_GSID_PIDR:\narch/powerpc/kvm/book3s_hv_nestedv2.c:245:\t\t\trc = kvmppc_gse_put_u32(gsb, iden, vcpu-\u003earch.pid);\narch/powerpc/kvm/book3s_hv_nestedv2.c-246-\t\t\tbreak;\n--\narch/powerpc/kvm/book3s_hv_nestedv2.c-253-\t\tcase KVMPPC_GSID_VRSAVE:\narch/powerpc/kvm/book3s_hv_nestedv2.c:254:\t\t\trc = kvmppc_gse_put_u32(gsb, iden, vcpu-\u003earch.vrsave);\narch/powerpc/kvm/book3s_hv_nestedv2.c-255-\t\t\tbreak;\n--\narch/powerpc/kvm/book3s_hv_nestedv2.c-265-\t\t\ti = iden - KVMPPC_GSID_PMC(0);\narch/powerpc/kvm/book3s_hv_nestedv2.c:266:\t\t\trc = kvmppc_gse_put_u32(gsb, iden, vcpu-\u003earch.pmc[i]);\narch/powerpc/kvm/book3s_hv_nestedv2.c-267-\t\t\tbreak;\n--\narch/powerpc/kvm/book3s_hv_nestedv2.c-273-\t\tcase KVMPPC_GSID_CR:\narch/powerpc/kvm/book3s_hv_nestedv2.c:274:\t\t\trc = kvmppc_gse_put_u32(gsb, iden, vcpu-\u003earch.regs.ccr);\narch/powerpc/kvm/book3s_hv_nestedv2.c-275-\t\t\tbreak;\n--\narch/powerpc/kvm/book3s_hv_nestedv2.c-317-\t\tcase KVMPPC_GSID_DSISR:\narch/powerpc/kvm/book3s_hv_nestedv2.c:318:\t\t\trc = kvmppc_gse_put_u32(gsb, iden,\narch/powerpc/kvm/book3s_hv_nestedv2.c-319-\t\t\t\t\t\tvcpu-\u003earch.shregs.dsisr);\n--\narch/powerpc/kvm/book3s_hv_nestedv2.c-351-\t\tcase KVMPPC_GSID_VSCR:\narch/powerpc/kvm/book3s_hv_nestedv2.c:352:\t\t\trc = kvmppc_gse_put_u32(gsb, iden,\narch/powerpc/kvm/book3s_hv_nestedv2.c-353-\t\t\t\t\t\tvcpu-\u003earch.vr.vscr.u[3]);\n--\narch/powerpc/kvm/book3s_hv_nestedv2.c-387-\t\t\t}\narch/powerpc/kvm/book3s_hv_nestedv2.c:388:\t\t\trc = kvmppc_gse_put_u32(gsb, iden, arch_compat);\narch/powerpc/kvm/book3s_hv_nestedv2.c-389-\t\t\tbreak;\n--\narch/powerpc/kvm/test-guest-state-buffer.c=236=static int test1_fill_info(struct kvmppc_gs_buff gsb,\n--\narch/powerpc/kvm/test-guest-state-buffer.c-244-\tif (kvmppc_gsm_includes(gsm, KVMPPC_GSID_CR))\narch/powerpc/kvm/test-guest-state-buffer.c:245:\t\tkvmppc_gse_put_u32(gsb, KVMPPC_GSID_CR, data-\u003eb);\narch/powerpc/kvm/test-guest-state-buffer.c-246-\n--\narch/x86/events/intel/bts.c=184=static void bts_update(struct bts_ctx bts)\n--\narch/x86/events/intel/bts.c-201-\t\tif (ds-\u003ebts_index \u003e= ds-\u003ebts_absolute_maximum)\narch/x86/events/intel/bts.c:202:\t\t\tperf_aux_output_flag(\u0026bts-\u003ehandle,\narch/x86/events/intel/bts.c-203-\t\t\t PERF_AUX_FLAG_TRUNCATED);\n--\narch/x86/events/intel/pt.c=419=static void pt_config_start(struct perf_event event)\n--\narch/x86/events/intel/pt.c-428-\tif (READ_ONCE(pt-\u003evmx_on))\narch/x86/events/intel/pt.c:429:\t\tperf_aux_output_flag(\u0026pt-\u003ehandle, PERF_AUX_FLAG_PARTIAL);\narch/x86/events/intel/pt.c-430-\telse\n--\narch/x86/events/intel/pt.c=932=static void pt_handle_status(struct pt pt)\n--\narch/x86/events/intel/pt.c-956-\t\t buf-\u003eoutput_off == pt_buffer_region_size(buf))) {\narch/x86/events/intel/pt.c:957:\t\t\tperf_aux_output_flag(\u0026pt-\u003ehandle,\narch/x86/events/intel/pt.c-958-\t\t\t PERF_AUX_FLAG_TRUNCATED);\n--\narch/x86/events/intel/pt.c=1116=static int pt_buffer_reset_markers(struct pt_buffer buf,\n--\narch/x86/events/intel/pt.c-1127-\tif (buf-\u003eoutput_off + handle-\u003esize + 1 \u003c pt_buffer_region_size(buf)) {\narch/x86/events/intel/pt.c:1128:\t\tperf_aux_output_flag(handle, PERF_AUX_FLAG_TRUNCATED);\narch/x86/events/intel/pt.c-1129-\t\treturn -EINVAL;\n--\narch/x86/events/intel/pt.c=1571=void intel_pt_handle_vmx(int on)\n--\narch/x86/events/intel/pt.c-1595-\tif (event)\narch/x86/events/intel/pt.c:1596:\t\tperf_aux_output_flag(\u0026pt-\u003ehandle,\narch/x86/events/intel/pt.c-1597-\t\t PERF_AUX_FLAG_PARTIAL);\n--\ncrypto/crypto_user.c=86=static int crypto_report_one(struct crypto_alg alg,\n--\ncrypto/crypto_user.c-99-\ncrypto/crypto_user.c:100:\tif (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg-\u003ecra_priority))\ncrypto/crypto_user.c-101-\t\tgoto nla_put_failure;\n--\ndrivers/acpi/acpica/acglobal.h=265=ACPI_GLOBAL(u32, acpi_gbl_original_dbg_layer);\n--\ndrivers/acpi/acpica/acglobal.h-272-\ndrivers/acpi/acpica/acglobal.h:273:ACPI_INIT_GLOBAL(u8, acpi_gbl_db_output_flags, ACPI_DB_CONSOLE_OUTPUT);\ndrivers/acpi/acpica/acglobal.h-274-\n--\ndrivers/acpi/acpica/dbutils.c=37=acpi_db_match_argument(char user_argument,\n--\ndrivers/acpi/acpica/dbutils.c-62- \ndrivers/acpi/acpica/dbutils.c:63: * PARAMETERS: output_flags - Current flags word\ndrivers/acpi/acpica/dbutils.c-64- \n--\ndrivers/acpi/acpica/dbutils.c-71-\ndrivers/acpi/acpica/dbutils.c:72:void acpi_db_set_output_destination(u32 output_flags)\ndrivers/acpi/acpica/dbutils.c-73-{\ndrivers/acpi/acpica/dbutils.c-74-\ndrivers/acpi/acpica/dbutils.c:75:\tacpi_gbl_db_output_flags = (u8)output_flags;\ndrivers/acpi/acpica/dbutils.c-76-\ndrivers/acpi/acpica/dbutils.c:77:\tif ((output_flags \u0026 ACPI_DB_REDIRECTABLE_OUTPUT) \u0026\u0026\ndrivers/acpi/acpica/dbutils.c-78-\t acpi_gbl_db_output_to_file) {\n--\ndrivers/acpi/acpica/dbxface.c=395=acpi_status acpi_initialize_debugger(void)\n--\ndrivers/acpi/acpica/dbxface.c-408-\tacpi_gbl_db_console_debug_level = ACPI_NORMAL_DEFAULT \| ACPI_LV_TABLES;\ndrivers/acpi/acpica/dbxface.c:409:\tacpi_gbl_db_output_flags = ACPI_DB_CONSOLE_OUTPUT;\ndrivers/acpi/acpica/dbxface.c-410-\n--\ndrivers/acpi/acpica/dbxface.c=476=void acpi_terminate_debugger(void)\n--\ndrivers/acpi/acpica/dbxface.c-500-\ndrivers/acpi/acpica/dbxface.c:501:\tacpi_gbl_db_output_flags = ACPI_DB_DISABLE_OUTPUT;\ndrivers/acpi/acpica/dbxface.c-502-}\n--\ndrivers/android/binder.c=3016=static void binder_netlink_report(struct binder_proc proc,\n--\ndrivers/android/binder.c-3038-\ndrivers/android/binder.c:3039:\tif (nla_put_u32(skb, BINDER_A_REPORT_ERROR, error) \|\|\ndrivers/android/binder.c:3040:\t nla_put_string(skb, BINDER_A_REPORT_CONTEXT, context) \|\|\ndrivers/android/binder.c:3041:\t nla_put_u32(skb, BINDER_A_REPORT_FROM_PID, t-\u003efrom_pid) \|\|\ndrivers/android/binder.c:3042:\t nla_put_u32(skb, BINDER_A_REPORT_FROM_TID, t-\u003efrom_tid))\ndrivers/android/binder.c-3043-\t\tgoto cancel_skb;\n--\ndrivers/android/binder.c-3045-\tif (t-\u003eto_proc \u0026\u0026\ndrivers/android/binder.c:3046:\t nla_put_u32(skb, BINDER_A_REPORT_TO_PID, t-\u003eto_proc-\u003epid))\ndrivers/android/binder.c-3047-\t\tgoto cancel_skb;\n--\ndrivers/android/binder.c-3049-\tif (t-\u003eto_thread \u0026\u0026\ndrivers/android/binder.c:3050:\t nla_put_u32(skb, BINDER_A_REPORT_TO_TID, t-\u003eto_thread-\u003epid))\ndrivers/android/binder.c-3051-\t\tgoto cancel_skb;\ndrivers/android/binder.c-3052-\ndrivers/android/binder.c:3053:\tif (t-\u003eis_reply \u0026\u0026 nla_put_flag(skb, BINDER_A_REPORT_IS_REPLY))\ndrivers/android/binder.c-3054-\t\tgoto cancel_skb;\ndrivers/android/binder.c-3055-\ndrivers/android/binder.c:3056:\tif (nla_put_u32(skb, BINDER_A_REPORT_FLAGS, t-\u003eflags) \|\|\ndrivers/android/binder.c:3057:\t nla_put_u32(skb, BINDER_A_REPORT_CODE, t-\u003ecode) \|\|\ndrivers/android/binder.c:3058:\t nla_put_u32(skb, BINDER_A_REPORT_DATA_SIZE, data_size))\ndrivers/android/binder.c-3059-\t\tgoto cancel_skb;\n--\ndrivers/android/binder/netlink.rs=57= pub fn error(\u0026mut self, val: u32) -\u003e Result {\ndrivers/android/binder/netlink.rs-58- const BINDER_A_REPORT_ERROR: c_int = kernel::uapi::BINDER_A_REPORT_ERROR as c_int;\ndrivers/android/binder/netlink.rs:59: self.skb.put_u32(BINDER_A_REPORT_ERROR, val)\ndrivers/android/binder/netlink.rs-60- }\n--\ndrivers/android/binder/netlink.rs=63= pub fn context(\u0026mut self, val: \u0026CStr) -\u003e Result {\ndrivers/android/binder/netlink.rs-64- const BINDER_A_REPORT_CONTEXT: c_int = kernel::uapi::BINDER_A_REPORT_CONTEXT as c_int;\ndrivers/android/binder/netlink.rs:65: self.skb.put_string(BINDER_A_REPORT_CONTEXT, val)\ndrivers/android/binder/netlink.rs-66- }\n--\ndrivers/android/binder/netlink.rs=69= pub fn from_pid(\u0026mut self, val: u32) -\u003e Result {\ndrivers/android/binder/netlink.rs-70- const BINDER_A_REPORT_FROM_PID: c_int = kernel::uapi::BINDER_A_REPORT_FROM_PID as c_int;\ndrivers/android/binder/netlink.rs:71: self.skb.put_u32(BINDER_A_REPORT_FROM_PID, val)\ndrivers/android/binder/netlink.rs-72- }\n--\ndrivers/android/binder/netlink.rs=75= pub fn from_tid(\u0026mut self, val: u32) -\u003e Result {\ndrivers/android/binder/netlink.rs-76- const BINDER_A_REPORT_FROM_TID: c_int = kernel::uapi::BINDER_A_REPORT_FROM_TID as c_int;\ndrivers/android/binder/netlink.rs:77: self.skb.put_u32(BINDER_A_REPORT_FROM_TID, val)\ndrivers/android/binder/netlink.rs-78- }\n--\ndrivers/android/binder/netlink.rs=82= pub fn to_pid(\u0026mut self, val: u32) -\u003e Result {\ndrivers/android/binder/netlink.rs-83- const BINDER_A_REPORT_TO_PID: c_int = kernel::uapi::BINDER_A_REPORT_TO_PID as c_int;\ndrivers/android/binder/netlink.rs:84: self.skb.put_u32(BINDER_A_REPORT_TO_PID, val)\ndrivers/android/binder/netlink.rs-85- }\n--\ndrivers/android/binder/netlink.rs=89= pub fn to_tid(\u0026mut self, val: u32) -\u003e Result {\ndrivers/android/binder/netlink.rs-90- const BINDER_A_REPORT_TO_TID: c_int = kernel::uapi::BINDER_A_REPORT_TO_TID as c_int;\ndrivers/android/binder/netlink.rs:91: self.skb.put_u32(BINDER_A_REPORT_TO_TID, val)\ndrivers/android/binder/netlink.rs-92- }\n--\ndrivers/android/binder/netlink.rs=95= pub fn is_reply(\u0026mut self) -\u003e Result {\ndrivers/android/binder/netlink.rs-96- const BINDER_A_REPORT_IS_REPLY: c_int = kernel::uapi::BINDER_A_REPORT_IS_REPLY as c_int;\ndrivers/android/binder/netlink.rs:97: self.skb.put_flag(BINDER_A_REPORT_IS_REPLY)\ndrivers/android/binder/netlink.rs-98- }\n--\ndrivers/android/binder/netlink.rs=101= pub fn flags(\u0026mut self, val: u32) -\u003e Result {\ndrivers/android/binder/netlink.rs-102- const BINDER_A_REPORT_FLAGS: c_int = kernel::uapi::BINDER_A_REPORT_FLAGS as c_int;\ndrivers/android/binder/netlink.rs:103: self.skb.put_u32(BINDER_A_REPORT_FLAGS, val)\ndrivers/android/binder/netlink.rs-104- }\n--\ndrivers/android/binder/netlink.rs=107= pub fn code(\u0026mut self, val: u32) -\u003e Result {\ndrivers/android/binder/netlink.rs-108- const BINDER_A_REPORT_CODE: c_int = kernel::uapi::BINDER_A_REPORT_CODE as c_int;\ndrivers/android/binder/netlink.rs:109: self.skb.put_u32(BINDER_A_REPORT_CODE, val)\ndrivers/android/binder/netlink.rs-110- }\n--\ndrivers/android/binder/netlink.rs=113= pub fn data_size(\u0026mut self, val: u32) -\u003e Result {\ndrivers/android/binder/netlink.rs-114- const BINDER_A_REPORT_DATA_SIZE: c_int = kernel::uapi::BINDER_A_REPORT_DATA_SIZE as c_int;\ndrivers/android/binder/netlink.rs:115: self.skb.put_u32(BINDER_A_REPORT_DATA_SIZE, val)\ndrivers/android/binder/netlink.rs-116- }\n--\ndrivers/block/drbd/drbd_nl.c=59=static int drbd_msg_put_info(struct sk_buff skb, const char info)\n--\ndrivers/block/drbd/drbd_nl.c-70-\ndrivers/block/drbd/drbd_nl.c:71:\terr = nla_put_string(skb, DRBD_A_DRBD_CFG_REPLY_INFO_TEXT, info);\ndrivers/block/drbd/drbd_nl.c-72-\tif (err) {\n--\ndrivers/block/drbd/drbd_nl.c=3274=static int nla_put_drbd_cfg_context(struct sk_buff skb,\n--\ndrivers/block/drbd/drbd_nl.c-3283-\tif (device \u0026\u0026\ndrivers/block/drbd/drbd_nl.c:3284:\t nla_put_u32(skb, DRBD_A_DRBD_CFG_CONTEXT_CTX_VOLUME, device-\u003evnr))\ndrivers/block/drbd/drbd_nl.c-3285-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl.c:3286:\tif (nla_put_string(skb, DRBD_A_DRBD_CFG_CONTEXT_CTX_RESOURCE_NAME, resource-\u003ename))\ndrivers/block/drbd/drbd_nl.c-3287-\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl.c=3822=static int nla_put_status_info(struct sk_buff skb, struct drbd_device device,\n--\ndrivers/block/drbd/drbd_nl.c-3875-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl.c:3876:\tif (nla_put_u32(skb, DRBD_A_STATE_INFO_SIB_REASON,\ndrivers/block/drbd/drbd_nl.c-3877-\t\t sib ? sib-\u003esib_reason : SIB_GET_STATUS_REPLY) \|\|\ndrivers/block/drbd/drbd_nl.c:3878:\t nla_put_u32(skb, DRBD_A_STATE_INFO_CURRENT_STATE,\ndrivers/block/drbd/drbd_nl.c-3879-\t\t device-\u003estate.i) \|\|\n--\ndrivers/block/drbd/drbd_nl.c-3895-\t\t\t device-\u003ebm_writ_cnt, 0) \|\|\ndrivers/block/drbd/drbd_nl.c:3896:\t nla_put_u32(skb, DRBD_A_STATE_INFO_AP_BIO_CNT,\ndrivers/block/drbd/drbd_nl.c-3897-\t\t atomic_read(\u0026device-\u003eap_bio_cnt)) \|\|\ndrivers/block/drbd/drbd_nl.c:3898:\t nla_put_u32(skb, DRBD_A_STATE_INFO_AP_PENDING_CNT,\ndrivers/block/drbd/drbd_nl.c-3899-\t\t atomic_read(\u0026device-\u003eap_pending_cnt)) \|\|\ndrivers/block/drbd/drbd_nl.c:3900:\t nla_put_u32(skb, DRBD_A_STATE_INFO_RS_PENDING_CNT,\ndrivers/block/drbd/drbd_nl.c-3901-\t\t atomic_read(\u0026device-\u003ers_pending_cnt)))\n--\ndrivers/block/drbd/drbd_nl.c-3915-\ndrivers/block/drbd/drbd_nl.c:3916:\t\tif (nla_put_u32(skb, DRBD_A_STATE_INFO_DISK_FLAGS, device-\u003eldev-\u003emd.flags) \|\|\ndrivers/block/drbd/drbd_nl.c-3917-\t\t nla_put_u64_64bit(skb, DRBD_A_STATE_INFO_BITS_TOTAL, drbd_bm_bits(device), 0) \|\|\n--\ndrivers/block/drbd/drbd_nl.c-3936-\t\tcase SIB_STATE_CHANGE:\ndrivers/block/drbd/drbd_nl.c:3937:\t\t\tif (nla_put_u32(skb, DRBD_A_STATE_INFO_PREV_STATE, sib-\u003eos.i) \|\|\ndrivers/block/drbd/drbd_nl.c:3938:\t\t\t nla_put_u32(skb, DRBD_A_STATE_INFO_NEW_STATE, sib-\u003ens.i))\ndrivers/block/drbd/drbd_nl.c-3939-\t\t\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl.c-3941-\t\tcase SIB_HELPER_POST:\ndrivers/block/drbd/drbd_nl.c:3942:\t\t\tif (nla_put_u32(skb, DRBD_A_STATE_INFO_HELPER_EXIT_CODE,\ndrivers/block/drbd/drbd_nl.c-3943-\t\t\t\t\tsib-\u003ehelper_exit_code))\n--\ndrivers/block/drbd/drbd_nl.c-3946-\t\tcase SIB_HELPER_PRE:\ndrivers/block/drbd/drbd_nl.c:3947:\t\t\tif (nla_put_string(skb, DRBD_A_STATE_INFO_HELPER, sib-\u003ehelper_name))\ndrivers/block/drbd/drbd_nl.c-3948-\t\t\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl_gen.c=1876=int drbd_cfg_context_to_skb(struct sk_buff skb, struct drbd_cfg_context s)\n--\ndrivers/block/drbd/drbd_nl_gen.c-1882-\ndrivers/block/drbd/drbd_nl_gen.c:1883:\tif (nla_put_u32(skb, DRBD_A_DRBD_CFG_CONTEXT_CTX_VOLUME, s-\u003ectx_volume))\ndrivers/block/drbd/drbd_nl_gen.c-1884-\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl_gen.c=1904=int disk_conf_to_skb(struct sk_buff skb, struct disk_conf s)\n--\ndrivers/block/drbd/drbd_nl_gen.c-1920-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:1921:\tif (nla_put_u32(skb, DRBD_A_DISK_CONF_MAX_BIO_BVECS, s-\u003emax_bio_bvecs))\ndrivers/block/drbd/drbd_nl_gen.c-1922-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:1923:\tif (nla_put_u32(skb, DRBD_A_DISK_CONF_ON_IO_ERROR, s-\u003eon_io_error))\ndrivers/block/drbd/drbd_nl_gen.c-1924-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:1925:\tif (nla_put_u32(skb, DRBD_A_DISK_CONF_FENCING, s-\u003efencing))\ndrivers/block/drbd/drbd_nl_gen.c-1926-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:1927:\tif (nla_put_u32(skb, DRBD_A_DISK_CONF_RESYNC_RATE, s-\u003eresync_rate))\ndrivers/block/drbd/drbd_nl_gen.c-1928-\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl_gen.c-1930-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:1931:\tif (nla_put_u32(skb, DRBD_A_DISK_CONF_AL_EXTENTS, s-\u003eal_extents))\ndrivers/block/drbd/drbd_nl_gen.c-1932-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:1933:\tif (nla_put_u32(skb, DRBD_A_DISK_CONF_C_PLAN_AHEAD, s-\u003ec_plan_ahead))\ndrivers/block/drbd/drbd_nl_gen.c-1934-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:1935:\tif (nla_put_u32(skb, DRBD_A_DISK_CONF_C_DELAY_TARGET, s-\u003ec_delay_target))\ndrivers/block/drbd/drbd_nl_gen.c-1936-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:1937:\tif (nla_put_u32(skb, DRBD_A_DISK_CONF_C_FILL_TARGET, s-\u003ec_fill_target))\ndrivers/block/drbd/drbd_nl_gen.c-1938-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:1939:\tif (nla_put_u32(skb, DRBD_A_DISK_CONF_C_MAX_RATE, s-\u003ec_max_rate))\ndrivers/block/drbd/drbd_nl_gen.c-1940-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:1941:\tif (nla_put_u32(skb, DRBD_A_DISK_CONF_C_MIN_RATE, s-\u003ec_min_rate))\ndrivers/block/drbd/drbd_nl_gen.c-1942-\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl_gen.c-1950-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:1951:\tif (nla_put_u32(skb, DRBD_A_DISK_CONF_DISK_TIMEOUT, s-\u003edisk_timeout))\ndrivers/block/drbd/drbd_nl_gen.c-1952-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:1953:\tif (nla_put_u32(skb, DRBD_A_DISK_CONF_READ_BALANCING, s-\u003eread_balancing))\ndrivers/block/drbd/drbd_nl_gen.c-1954-\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl_gen.c-1958-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:1959:\tif (nla_put_u32(skb, DRBD_A_DISK_CONF_RS_DISCARD_GRANULARITY, s-\u003ers_discard_granularity))\ndrivers/block/drbd/drbd_nl_gen.c-1960-\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl_gen.c=1973=int res_opts_to_skb(struct sk_buff skb, struct res_opts s)\n--\ndrivers/block/drbd/drbd_nl_gen.c-1982-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:1983:\tif (nla_put_u32(skb, DRBD_A_RES_OPTS_ON_NO_DATA, s-\u003eon_no_data))\ndrivers/block/drbd/drbd_nl_gen.c-1984-\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl_gen.c=1995=int net_conf_to_skb(struct sk_buff skb, struct net_conf s)\n--\ndrivers/block/drbd/drbd_nl_gen.c-2016-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2017:\tif (nla_put_u32(skb, DRBD_A_NET_CONF_WIRE_PROTOCOL, s-\u003ewire_protocol))\ndrivers/block/drbd/drbd_nl_gen.c-2018-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2019:\tif (nla_put_u32(skb, DRBD_A_NET_CONF_CONNECT_INT, s-\u003econnect_int))\ndrivers/block/drbd/drbd_nl_gen.c-2020-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2021:\tif (nla_put_u32(skb, DRBD_A_NET_CONF_TIMEOUT, s-\u003etimeout))\ndrivers/block/drbd/drbd_nl_gen.c-2022-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2023:\tif (nla_put_u32(skb, DRBD_A_NET_CONF_PING_INT, s-\u003eping_int))\ndrivers/block/drbd/drbd_nl_gen.c-2024-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2025:\tif (nla_put_u32(skb, DRBD_A_NET_CONF_PING_TIMEO, s-\u003eping_timeo))\ndrivers/block/drbd/drbd_nl_gen.c-2026-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2027:\tif (nla_put_u32(skb, DRBD_A_NET_CONF_SNDBUF_SIZE, s-\u003esndbuf_size))\ndrivers/block/drbd/drbd_nl_gen.c-2028-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2029:\tif (nla_put_u32(skb, DRBD_A_NET_CONF_RCVBUF_SIZE, s-\u003ercvbuf_size))\ndrivers/block/drbd/drbd_nl_gen.c-2030-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2031:\tif (nla_put_u32(skb, DRBD_A_NET_CONF_KO_COUNT, s-\u003eko_count))\ndrivers/block/drbd/drbd_nl_gen.c-2032-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2033:\tif (nla_put_u32(skb, DRBD_A_NET_CONF_MAX_BUFFERS, s-\u003emax_buffers))\ndrivers/block/drbd/drbd_nl_gen.c-2034-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2035:\tif (nla_put_u32(skb, DRBD_A_NET_CONF_MAX_EPOCH_SIZE, s-\u003emax_epoch_size))\ndrivers/block/drbd/drbd_nl_gen.c-2036-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2037:\tif (nla_put_u32(skb, DRBD_A_NET_CONF_UNPLUG_WATERMARK, s-\u003eunplug_watermark))\ndrivers/block/drbd/drbd_nl_gen.c-2038-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2039:\tif (nla_put_u32(skb, DRBD_A_NET_CONF_AFTER_SB_0P, s-\u003eafter_sb_0p))\ndrivers/block/drbd/drbd_nl_gen.c-2040-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2041:\tif (nla_put_u32(skb, DRBD_A_NET_CONF_AFTER_SB_1P, s-\u003eafter_sb_1p))\ndrivers/block/drbd/drbd_nl_gen.c-2042-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2043:\tif (nla_put_u32(skb, DRBD_A_NET_CONF_AFTER_SB_2P, s-\u003eafter_sb_2p))\ndrivers/block/drbd/drbd_nl_gen.c-2044-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2045:\tif (nla_put_u32(skb, DRBD_A_NET_CONF_RR_CONFLICT, s-\u003err_conflict))\ndrivers/block/drbd/drbd_nl_gen.c-2046-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2047:\tif (nla_put_u32(skb, DRBD_A_NET_CONF_ON_CONGESTION, s-\u003eon_congestion))\ndrivers/block/drbd/drbd_nl_gen.c-2048-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2049:\tif (nla_put_u32(skb, DRBD_A_NET_CONF_CONG_FILL, s-\u003econg_fill))\ndrivers/block/drbd/drbd_nl_gen.c-2050-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2051:\tif (nla_put_u32(skb, DRBD_A_NET_CONF_CONG_EXTENTS, s-\u003econg_extents))\ndrivers/block/drbd/drbd_nl_gen.c-2052-\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl_gen.c-2066-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2067:\tif (nla_put_u32(skb, DRBD_A_NET_CONF_SOCK_CHECK_TIMEO, s-\u003esock_check_timeo))\ndrivers/block/drbd/drbd_nl_gen.c-2068-\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl_gen.c=2098=int resize_parms_to_skb(struct sk_buff skb, struct resize_parms s)\n--\ndrivers/block/drbd/drbd_nl_gen.c-2110-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2111:\tif (nla_put_u32(skb, DRBD_A_RESIZE_PARMS_AL_STRIPES, s-\u003eal_stripes))\ndrivers/block/drbd/drbd_nl_gen.c-2112-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2113:\tif (nla_put_u32(skb, DRBD_A_RESIZE_PARMS_AL_STRIPE_SIZE, s-\u003eal_stripe_size))\ndrivers/block/drbd/drbd_nl_gen.c-2114-\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl_gen.c=2125=int state_info_to_skb(struct sk_buff skb, struct state_info s)\n--\ndrivers/block/drbd/drbd_nl_gen.c-2131-\ndrivers/block/drbd/drbd_nl_gen.c:2132:\tif (nla_put_u32(skb, DRBD_A_STATE_INFO_SIB_REASON, s-\u003esib_reason))\ndrivers/block/drbd/drbd_nl_gen.c-2133-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2134:\tif (nla_put_u32(skb, DRBD_A_STATE_INFO_CURRENT_STATE, s-\u003ecurrent_state))\ndrivers/block/drbd/drbd_nl_gen.c-2135-\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl_gen.c-2139-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2140:\tif (nla_put_u32(skb, DRBD_A_STATE_INFO_PREV_STATE, s-\u003eprev_state))\ndrivers/block/drbd/drbd_nl_gen.c-2141-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2142:\tif (nla_put_u32(skb, DRBD_A_STATE_INFO_NEW_STATE, s-\u003enew_state))\ndrivers/block/drbd/drbd_nl_gen.c-2143-\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl_gen.c-2146-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2147:\tif (nla_put_u32(skb, DRBD_A_STATE_INFO_DISK_FLAGS, s-\u003edisk_flags))\ndrivers/block/drbd/drbd_nl_gen.c-2148-\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl_gen.c-2159-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2160:\tif (nla_put_u32(skb, DRBD_A_STATE_INFO_HELPER_EXIT_CODE, s-\u003ehelper_exit_code))\ndrivers/block/drbd/drbd_nl_gen.c-2161-\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl_gen.c-2173-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2174:\tif (nla_put_u32(skb, DRBD_A_STATE_INFO_AP_BIO_CNT, s-\u003eap_bio_cnt))\ndrivers/block/drbd/drbd_nl_gen.c-2175-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2176:\tif (nla_put_u32(skb, DRBD_A_STATE_INFO_AP_PENDING_CNT, s-\u003eap_pending_cnt))\ndrivers/block/drbd/drbd_nl_gen.c-2177-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2178:\tif (nla_put_u32(skb, DRBD_A_STATE_INFO_RS_PENDING_CNT, s-\u003ers_pending_cnt))\ndrivers/block/drbd/drbd_nl_gen.c-2179-\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl_gen.c=2230=int timeout_parms_to_skb(struct sk_buff skb, struct timeout_parms s)\n--\ndrivers/block/drbd/drbd_nl_gen.c-2236-\ndrivers/block/drbd/drbd_nl_gen.c:2237:\tif (nla_put_u32(skb, DRBD_A_TIMEOUT_PARMS_TIMEOUT_TYPE, s-\u003etimeout_type))\ndrivers/block/drbd/drbd_nl_gen.c-2238-\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl_gen.c=2287=int resource_info_to_skb(struct sk_buff skb, struct resource_info s)\n--\ndrivers/block/drbd/drbd_nl_gen.c-2293-\ndrivers/block/drbd/drbd_nl_gen.c:2294:\tif (nla_put_u32(skb, DRBD_A_RESOURCE_INFO_RES_ROLE, s-\u003eres_role))\ndrivers/block/drbd/drbd_nl_gen.c-2295-\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl_gen.c=2312=int device_info_to_skb(struct sk_buff skb, struct device_info s)\n--\ndrivers/block/drbd/drbd_nl_gen.c-2318-\ndrivers/block/drbd/drbd_nl_gen.c:2319:\tif (nla_put_u32(skb, DRBD_A_DEVICE_INFO_DEV_DISK_STATE, s-\u003edev_disk_state))\ndrivers/block/drbd/drbd_nl_gen.c-2320-\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl_gen.c=2331=int connection_info_to_skb(struct sk_buff skb, struct connection_info s)\n--\ndrivers/block/drbd/drbd_nl_gen.c-2337-\ndrivers/block/drbd/drbd_nl_gen.c:2338:\tif (nla_put_u32(skb, DRBD_A_CONNECTION_INFO_CONN_CONNECTION_STATE, s-\u003econn_connection_state))\ndrivers/block/drbd/drbd_nl_gen.c-2339-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2340:\tif (nla_put_u32(skb, DRBD_A_CONNECTION_INFO_CONN_ROLE, s-\u003econn_role))\ndrivers/block/drbd/drbd_nl_gen.c-2341-\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl_gen.c=2352=int peer_device_info_to_skb(struct sk_buff skb, struct peer_device_info s)\n--\ndrivers/block/drbd/drbd_nl_gen.c-2358-\ndrivers/block/drbd/drbd_nl_gen.c:2359:\tif (nla_put_u32(skb, DRBD_A_PEER_DEVICE_INFO_PEER_REPL_STATE, s-\u003epeer_repl_state))\ndrivers/block/drbd/drbd_nl_gen.c-2360-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2361:\tif (nla_put_u32(skb, DRBD_A_PEER_DEVICE_INFO_PEER_DISK_STATE, s-\u003epeer_disk_state))\ndrivers/block/drbd/drbd_nl_gen.c-2362-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2363:\tif (nla_put_u32(skb, DRBD_A_PEER_DEVICE_INFO_PEER_RESYNC_SUSP_USER, s-\u003epeer_resync_susp_user))\ndrivers/block/drbd/drbd_nl_gen.c-2364-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2365:\tif (nla_put_u32(skb, DRBD_A_PEER_DEVICE_INFO_PEER_RESYNC_SUSP_PEER, s-\u003epeer_resync_susp_peer))\ndrivers/block/drbd/drbd_nl_gen.c-2366-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2367:\tif (nla_put_u32(skb, DRBD_A_PEER_DEVICE_INFO_PEER_RESYNC_SUSP_DEPENDENCY, s-\u003epeer_resync_susp_dependency))\ndrivers/block/drbd/drbd_nl_gen.c-2368-\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl_gen.c=2379=int resource_statistics_to_skb(struct sk_buff skb, struct resource_statistics s)\n--\ndrivers/block/drbd/drbd_nl_gen.c-2385-\ndrivers/block/drbd/drbd_nl_gen.c:2386:\tif (nla_put_u32(skb, DRBD_A_RESOURCE_STATISTICS_RES_STAT_WRITE_ORDERING, s-\u003eres_stat_write_ordering))\ndrivers/block/drbd/drbd_nl_gen.c-2387-\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl_gen.c=2398=int device_statistics_to_skb(struct sk_buff skb, struct device_statistics s)\n--\ndrivers/block/drbd/drbd_nl_gen.c-2414-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2415:\tif (nla_put_u32(skb, DRBD_A_DEVICE_STATISTICS_DEV_UPPER_PENDING, s-\u003edev_upper_pending))\ndrivers/block/drbd/drbd_nl_gen.c-2416-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2417:\tif (nla_put_u32(skb, DRBD_A_DEVICE_STATISTICS_DEV_LOWER_PENDING, s-\u003edev_lower_pending))\ndrivers/block/drbd/drbd_nl_gen.c-2418-\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl_gen.c-2428-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2429:\tif (nla_put_u32(skb, DRBD_A_DEVICE_STATISTICS_DEV_DISK_FLAGS, s-\u003edev_disk_flags))\ndrivers/block/drbd/drbd_nl_gen.c-2430-\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl_gen.c=2463=int peer_device_statistics_to_skb(struct sk_buff skb, struct peer_device_statistics s)\n--\ndrivers/block/drbd/drbd_nl_gen.c-2473-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2474:\tif (nla_put_u32(skb, DRBD_A_PEER_DEVICE_STATISTICS_PEER_DEV_PENDING, s-\u003epeer_dev_pending))\ndrivers/block/drbd/drbd_nl_gen.c-2475-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2476:\tif (nla_put_u32(skb, DRBD_A_PEER_DEVICE_STATISTICS_PEER_DEV_UNACKED, s-\u003epeer_dev_unacked))\ndrivers/block/drbd/drbd_nl_gen.c-2477-\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl_gen.c-2483-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2484:\tif (nla_put_u32(skb, DRBD_A_PEER_DEVICE_STATISTICS_PEER_DEV_FLAGS, s-\u003epeer_dev_flags))\ndrivers/block/drbd/drbd_nl_gen.c-2485-\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl_gen.c=2496=int drbd_notification_header_to_skb(struct sk_buff skb, struct drbd_notification_header s)\n--\ndrivers/block/drbd/drbd_nl_gen.c-2502-\ndrivers/block/drbd/drbd_nl_gen.c:2503:\tif (nla_put_u32(skb, DRBD_A_DRBD_NOTIFICATION_HEADER_NH_TYPE, s-\u003enh_type))\ndrivers/block/drbd/drbd_nl_gen.c-2504-\t\tgoto nla_put_failure;\n--\ndrivers/block/drbd/drbd_nl_gen.c=2515=int drbd_helper_info_to_skb(struct sk_buff skb, struct drbd_helper_info s)\n--\ndrivers/block/drbd/drbd_nl_gen.c-2524-\t\tgoto nla_put_failure;\ndrivers/block/drbd/drbd_nl_gen.c:2525:\tif (nla_put_u32(skb, DRBD_A_DRBD_HELPER_INFO_HELPER_STATUS, s-\u003ehelper_status))\ndrivers/block/drbd/drbd_nl_gen.c-2526-\t\tgoto nla_put_failure;\n--\ndrivers/block/nbd.c=2533=static int populate_nbd_status(struct nbd_device nbd, struct sk_buff *reply)\n--\ndrivers/block/nbd.c-2550-\t\treturn -EMSGSIZE;\ndrivers/block/nbd.c:2551:\tret = nla_put_u32(reply, NBD_DEVICE_INDEX, nbd-\u003eindex);\ndrivers/block/nbd.c-2552-\tif (ret)\n--\n\n" }
160/3	2026/09/27 08:03	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 35220 output: 37 thoughts: 32 Thoughts: Here's my take on the thought process, as requested: Diving into `netlink.rs` Okay, time to get my hands dirty. The task at hand is definitely related to the binder driver's interaction with the network. Since this area needs my attention, my first thought is to zero in on `drivers/android/binder/netlink.rs`. I need to understand how the binder driver is communicating with the network, which almost certainly involves `netlink`. This file is the obvious place to start. Let's see what gems we find inside!
161/3	2026/09/27 08:04	tool	read-file	0m Args: { "File": "drivers/android/binder/netlink.rs", "FirstLine": 1, "LineCount": 100 } Results: { "Contents": " 1:\t// SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)\n 2:\t/* Based on: Documentation/netlink/specs/binder.yaml /\n 3:\t\n 4:\t#![allow(unreachable_pub, clippy::wrong_self_convention)]\n 5:\tuse kernel::{\n 6:\t net::netlink::{\n 7:\t Family,\n 8:\t GenlMsg,\n 9:\t MulticastGroup,\n 10:\t NetlinkSkBuff, //\n 11:\t },\n 12:\t prelude::, //\n 13:\t};\n 14:\t\n 15:\tpub static BINDER_NL_FAMILY: Family = Family::const_new(\n 16:\t kernel::module::this_module::\u003ccrate::LocalModule\u003e(),\n 17:\t kernel::uapi::BINDER_FAMILY_NAME,\n 18:\t kernel::uapi::BINDER_FAMILY_VERSION,\n 19:\t \u0026BINDER_NL_FAMILY_MCGRPS,\n 20:\t);\n 21:\t\n 22:\tstatic BINDER_NL_FAMILY_MCGRPS: [MulticastGroup; 1] = [MulticastGroup::const_new(c\"report\")];\n 23:\t\n 24:\t/// A multicast event sent to userspace subscribers to notify them about\n 25:\t/// binder transaction failures. The generated report provides the full\n 26:\t/// details of the specific transaction that failed. The intention is for\n 27:\t/// programs to monitor these events and react to the failures as needed.\n 28:\tpub struct Report {\n 29:\t skb: GenlMsg,\n 30:\t}\n 31:\t\n 32:\timpl Report {\n 33:\t /// Create a new multicast message.\n 34:\t pub fn new(\n 35:\t size: usize,\n 36:\t portid: u32,\n 37:\t seq: u32,\n 38:\t flags: kernel::alloc::Flags,\n 39:\t ) -\u003e Result\u003cSelf, kernel::alloc::AllocError\u003e {\n 40:\t const BINDER_CMD_REPORT: u8 = kernel::uapi::BINDER_CMD_REPORT as u8;\n 41:\t let skb = NetlinkSkBuff::new(size, flags)?;\n 42:\t let skb = skb.genlmsg_put(portid, seq, \u0026BINDER_NL_FAMILY, BINDER_CMD_REPORT)?;\n 43:\t Ok(Self { skb })\n 44:\t }\n 45:\t\n 46:\t /// Broadcast this message.\n 47:\t pub fn multicast(self, portid: u32, flags: kernel::alloc::Flags) -\u003e Result {\n 48:\t self.skb.multicast(\u0026BINDER_NL_FAMILY, portid, 0, flags)\n 49:\t }\n 50:\t\n 51:\t /// Check if this message type has listeners.\n 52:\t pub fn has_listeners() -\u003e bool {\n 53:\t BINDER_NL_FAMILY.has_listeners(0)\n 54:\t }\n 55:\t\n 56:\t /// The enum binder_driver_return_protocol returned to the sender.\n 57:\t pub fn error(\u0026mut self, val: u32) -\u003e Result {\n 58:\t const BINDER_A_REPORT_ERROR: c_int = kernel::uapi::BINDER_A_REPORT_ERROR as c_int;\n 59:\t self.skb.put_u32(BINDER_A_REPORT_ERROR, val)\n 60:\t }\n 61:\t\n 62:\t /// The binder context where the transaction occurred.\n 63:\t pub fn context(\u0026mut self, val: \u0026CStr) -\u003e Result {\n 64:\t const BINDER_A_REPORT_CONTEXT: c_int = kernel::uapi::BINDER_A_REPORT_CONTEXT as c_int;\n 65:\t self.skb.put_string(BINDER_A_REPORT_CONTEXT, val)\n 66:\t }\n 67:\t\n 68:\t /// The PID of the sender process.\n 69:\t pub fn from_pid(\u0026mut self, val: u32) -\u003e Result {\n 70:\t const BINDER_A_REPORT_FROM_PID: c_int = kernel::uapi::BINDER_A_REPORT_FROM_PID as c_int;\n 71:\t self.skb.put_u32(BINDER_A_REPORT_FROM_PID, val)\n 72:\t }\n 73:\t\n 74:\t /// The TID of the sender thread.\n 75:\t pub fn from_tid(\u0026mut self, val: u32) -\u003e Result {\n 76:\t const BINDER_A_REPORT_FROM_TID: c_int = kernel::uapi::BINDER_A_REPORT_FROM_TID as c_int;\n 77:\t self.skb.put_u32(BINDER_A_REPORT_FROM_TID, val)\n 78:\t }\n 79:\t\n 80:\t /// The PID of the recipient process. This attribute may not be present\n 81:\t /// if the target could not be determined.\n 82:\t pub fn to_pid(\u0026mut self, val: u32) -\u003e Result {\n 83:\t const BINDER_A_REPORT_TO_PID: c_int = kernel::uapi::BINDER_A_REPORT_TO_PID as c_int;\n 84:\t self.skb.put_u32(BINDER_A_REPORT_TO_PID, val)\n 85:\t }\n 86:\t\n 87:\t /// The TID of the recipient thread. This attribute may not be present\n 88:\t /// if the target could not be determined.\n 89:\t pub fn to_tid(\u0026mut self, val: u32) -\u003e Result {\n 90:\t const BINDER_A_REPORT_TO_TID: c_int = kernel::uapi::BINDER_A_REPORT_TO_TID as c_int;\n 91:\t self.skb.put_u32(BINDER_A_REPORT_TO_TID, val)\n 92:\t }\n 93:\t\n 94:\t /// When present, indicates the failed transaction is a reply.\n 95:\t pub fn is_reply(\u0026mut self) -\u003e Result {\n 96:\t const BINDER_A_REPORT_IS_REPLY: c_int = kernel::uapi::BINDER_A_REPORT_IS_REPLY as c_int;\n 97:\t self.skb.put_flag(BINDER_A_REPORT_IS_REPLY)\n 98:\t }\n 99:\t\n 100:\t /// The bitmask of enum transaction_flags from the transaction.\n" }
162/3	2026/09/27 08:04	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 37208 output: 28 thoughts: 29 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience, presented in the first person: Investigating Netlink.rs in the Rust Kernel Alright, I need to get to the bottom of something with the Netlink implementation within the Rust kernel. My first instinct, as always, is to go straight to the source. Specifically, I need to check the commit history for `rust/kernel/net/netlink.rs`. The code is, of course, the definitive documentation. But, when I'm looking for why a particular change was made, or what the developers were thinking during a specific modification, the `git log` is invaluable. I need to understand the evolution of this particular file, so I'll see what the commit messages have to say. Let's see what the commit history tells me about the design decisions and the reasoning behind them.
163/3	2026/09/27 08:04	tool	grepper	0m Args: { "Expression": "MAX_PAYLOAD_LEN", "PathPrefix": "rust/" } Results: { "Output": "rust/kernel/net/netlink.rs=86= fn put\u003cT\u003e(\u0026mut self, attrtype: c_int, value: \u0026T) -\u003e Result\n--\nrust/kernel/net/netlink.rs-92- // the largest payload that still fits within that field.\nrust/kernel/net/netlink.rs:93: const MAX_PAYLOAD_LEN: usize = u16_as_usize(u16::MAX) - size_of::\u003cbindings::nlattr\u003e();\nrust/kernel/net/netlink.rs-94-\n--\nrust/kernel/net/netlink.rs-97- let ptr = core::ptr::from_ref(value).cast::\u003cc_void\u003e();\nrust/kernel/net/netlink.rs:98: if len \u003e MAX_PAYLOAD_LEN {\nrust/kernel/net/netlink.rs-99- return Err(EMSGSIZE);\n" }
164/3	2026/09/27 08:04	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 37684 output: 27 thoughts: 1185 Thoughts: Analyzing Potential Uninitialized Memory Risks in Netlink Attribute Handling Alright, let's break down this patch and see if it introduces any uninitialized memory concerns, given my expertise in this area. First, I need to understand the problem this patch addresses. Before this change, the `nla_put` function in C, when called from Rust code via the binding, was vulnerable to a potential integer overflow. If the payload length (`len`) of a netlink attribute was greater than the maximum size representable by a 16-bit field (`u16::MAX`) minus the size of the `nlattr` header, the code would truncate the attribute length. Specifically, in the C code, `nla->nla_len` would be truncated. This means `memset` would zero memory inside `nla_data(nla)` instead of at the end of the attribute! This could lead to out-of-bounds reads and writes, particularly when data is sent back to userspace, as userspace code relies on the truncated `nla->nla_len` field. This truncation, along with the `memcpy`, is the real risk here. Now, this patch adds a crucial check within the `GenlMsg::put` function in the Rust code: `if len > MAX_PAYLOAD_LEN { return Err(EMSGSIZE); }`. This condition acts as a defense mechanism, preventing an overflow by returning an error (`EMSGSIZE`) if the payload exceeds the maximum allowable length. So, does this patch introduce any new risks or expose existing ones? Let's go through the checklist for potential uninitialized memory problems: 1. Kernel structures sent to user space: The patch modifies the `put` function which deals with kernel data sent to user space. However, it's adding validation, not modifying data structures in an unsafe way. The critical thing to note is the use of the `AsBytes` trait. This trait, which I know from experience, guarantees that the type being passed (`T`) contains no uninitialized memory, meaning all bytes are initialized and safe to read. This is crucial for preventing uninitialized memory from leaking to userspace. 2. Conditional logic based on uninitialized data: The patch introduces conditional logic: the `if` statement. But this logic depends on a fully initialized value (`len`), derived directly from the size of a known and initialized data structure (`T`). There's no dependency on uninitialized variables. 3. Allocation or initialization of complex data structures: The patch doesn't introduce any new allocation or complex data structure initialization. It just adds a check on the `len`. 4. Bounds checks exposing uninitialized bytes: The bounds check added in this patch prevents accessing uninitialized bytes by preventing a potential overflow. It's a proactive measure. In conclusion, this patch is a good thing. It's a defensive fix that prevents a buffer overflow and therefore prevents uninitialized memory access. It adds validation and safeguards the integrity of netlink messages. By enforcing the length limit and leveraging the `AsBytes` marker trait, this patch actually reduces the risk of exposing uninitialized memory or related vulnerabilities. The patch is sound.
165/3	2026/09/27 08:04	tool	grepper	0m Args: { "Expression": "pub unsafe trait AsBytes", "PathPrefix": "rust/" } Results: { "Output": "rust/kernel/transmute.rs=142=macro_rules! impl_frombytes {\n--\nrust/kernel/transmute.rs-178-/// mutability.\nrust/kernel/transmute.rs:179:pub unsafe trait AsBytes {\nrust/kernel/transmute.rs-180- /// Returns `self` as a slice of bytes.\n" }
166/3	2026/09/27 08:04	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 39680 output: 36 thoughts: 25 Thoughts: Okay, let's dive into this. I'm going to pull up `rust/kernel/transmute.rs` and home in on lines 170-200. This is the section I need to analyze. My initial thought is likely focused on understanding the specific use case of `transmute` within this kernel context. I need to figure out why this particular section is significant, what's being accomplished here that couldn't be done another way, and what potential issues or clever optimizations might be present. I'll be looking for things like: * Type Safety Bypass: Is `transmute` being used to circumvent Rust's strict type system? If so, why? Is it for performance reasons, interacting with hardware, or something else entirely? * Memory Layout Assumptions: Are there assumptions about the underlying memory layout of the types being transmuted? This is crucial and a frequent source of subtle bugs. I'll need to scrutinize any casting to understand its implications for aliasing and data race conditions. * Safety Concerns: Is this code marked `unsafe`? If not, why not? If so, what justifications are provided, and do they hold up to scrutiny? I’ll need to assess the soundness of the claims. * Endianness and Architecture Dependence: I'll be keeping an eye out for potential endianness issues, especially if dealing with low-level data structures or hardware interaction. Also, I need to understand whether this section is architecture-specific or if it's designed to be portable. * Error Handling: How are errors, if any, handled in this context? Is there a risk of panics, or does the code gracefully handle potentially invalid transmutes? * Alternatives: Are there safer alternatives that could have been used here? If so, why was `transmute` chosen instead? Was performance really the deciding factor? My primary goal is to verify the code's correctness, understand its performance implications, and assess its maintainability within the larger system. I'll be looking for any signs of code smell, potential areas for improvement, and any documentation or comments that can provide clarity. This requires a precise and methodical approach, looking for potential pitfalls and corner cases. I'll mentally step through the control flow and ask: What assumptions are being made here, and are they valid under all possible conditions?
167/3	2026/09/27 08:04	tool	read-file	0m Args: { "File": "rust/kernel/transmute.rs", "FirstLine": 165, "LineCount": 40 } Results: { "Contents": " 165:\t///\n 166:\t/// If a struct implements this trait, then it is okay to copy it byte-for-byte to userspace. This\n 167:\t/// means that it should not have any padding, as padding bytes are uninitialized. Reading\n 168:\t/// uninitialized memory is not just undefined behavior, it may even lead to leaking sensitive\n 169:\t/// information on the stack to userspace.\n 170:\t///\n 171:\t/// The struct should also not hold kernel pointers, as kernel pointer addresses are also considered\n 172:\t/// sensitive. However, leaking kernel pointers is not considered undefined behavior by Rust, so\n 173:\t/// this is a correctness requirement, but not a safety requirement.\n 174:\t///\n 175:\t/// # Safety\n 176:\t///\n 177:\t/// Values of this type may not contain any uninitialized bytes. This type must not have interior\n 178:\t/// mutability.\n 179:\tpub unsafe trait AsBytes {\n 180:\t /// Returns `self` as a slice of bytes.\n 181:\t fn as_bytes(\u0026self) -\u003e \u0026[u8] {\n 182:\t // CAST: `Self` implements `AsBytes` thus all bytes of `self` are initialized.\n 183:\t let data = core::ptr::from_ref(self).cast::\u003cu8\u003e();\n 184:\t let len = core::mem::size_of_val(self);\n 185:\t\n 186:\t // SAFETY: `data` is non-null and valid for reads of `len * sizeof::\u003cu8\u003e()` bytes.\n 187:\t unsafe { core::slice::from_raw_parts(data, len) }\n 188:\t }\n 189:\t\n 190:\t /// Returns `self` as a mutable slice of bytes.\n 191:\t fn as_bytes_mut(\u0026mut self) -\u003e \u0026mut [u8]\n 192:\t where\n 193:\t Self: FromBytes,\n 194:\t {\n 195:\t // CAST: `Self` implements both `AsBytes` and `FromBytes` thus making `Self`\n 196:\t // bi-directionally transmutable to `[u8; size_of_val(self)]`.\n 197:\t let data = core::ptr::from_mut(self).cast::\u003cu8\u003e();\n 198:\t let len = core::mem::size_of_val(self);\n 199:\t\n 200:\t // SAFETY: `data` is non-null and valid for read and writes of `len * sizeof::\u003cu8\u003e()`\n 201:\t // bytes.\n 202:\t unsafe { core::slice::from_raw_parts_mut(data, len) }\n 203:\t }\n 204:\t}\n" }
168/3	2026/09/27 08:04	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 40998 output: 218 thoughts: 541 Thoughts: Analyzing the Uninitialized Memory Risk of this Patch Okay, so this patch is implementing a length check, specifically `len > MAX_PAYLOAD_LEN`, within `GenlMsg::put` to prevent integer overflow when dealing with the `nla_len` field in Netlink attributes. The core concern, as I see it, is whether this introduces or exposes any uninitialized memory risks. Let's break this down meticulously: First, let's look at the context provided by `AsBytes`. The `AsBytes` trait, which is a key player here, is very explicit: it mandates that values must not contain uninitialized bytes, and crucially, they must not have any interior mutability. This means that a structure implementing `AsBytes` is safe to be copied byte-for-byte to user space without worry. Padding, which is frequently uninitialized by default in Rust, is explicitly forbidden in types implementing this trait. Considering the patch itself, it's a very targeted check: restricting the payload length. It doesn't allocate anything new, it doesn't remove any existing initialization, and crucially, it doesn't alter any data structures in a way that would introduce an uninitialized state. It's essentially just an upper bound. Furthermore, it doesn't introduce any conditional branching logic that might be dependent on uninitialized memory, which is a major red flag for this kind of bug. Therefore, my initial assessment is a resounding "no." This patch does not introduce or expose uninitialized memory risks. My rationale is: * It's not allocating new buffers. * It's not removing initialization or zeroing steps. * It doesn't touch data structures sent to userspace in a way that introduces uninitialized memory. * It does not introduce branching on uninitialized memory. * The change effectively restricts the length passed to `nla_put` to ensure the value in `nla_len` doesn't overflow. Any potential out-of-bounds or overflow concerns that this change might trigger are problems that fall squarely within the purview of standard bug detection tools, or the Rust compiler or KASAN (Kernel Address Sanitizer). There's zero uninitialized memory risk introduced or exposed here. Therefore, NeedsKMSAN = false. To solidify this reasoning, I'll draw a clear contrast between KASAN and KMSAN applicability: * This patch adds an upper-bound check (`len > MAX_PAYLOAD_LEN`) in `GenlMsg::put`, which prevents integer overflows when truncating the attribute length into the 16-bit `nla_len` field. * The values serialized through `put` are bound by the guarantees of the `AsBytes` trait. This guarantees that all bytes are initialized, and no uninitialized padding is present. * The change does not introduce any new uninitialized memory, does not expose uninitialized padding or memory leaks to userspace, and doesn't create control flow based on uninitialized memory. * Potential memory issues are related to buffer lengths or overflows. These are detected by KASAN (specifically, out-of-bounds memory accesses), not KMSAN (uninitialized memory reads/information leaks). * Hence, dedicated KMSAN fuzzing is not necessary. I can confidently say this does not require it. Now, let's move on and call the `set-results` tool with this assessment.
169/3	2026/09/27 08:04	tool	set-results	0m Args: { "KMSANReasoning": "The patch introduces an explicit payload size check (`len \u003e MAX_PAYLOAD_LEN`) in `rust/kernel/net/netlink.rs` (`GenlMsg::put`) to prevent attribute length overflow when setting the 16-bit `nla_len` field in netlink attributes via `bindings::nla_put`. \n\nThe data serialized via `GenlMsg::put` is constrained by the `AsBytes` trait, which guarantees at the type system level that the type contains no uninitialized bytes or padding. The patch does not allocate uninitialized memory, does not read or branch on uninitialized fields, and does not expose uninitialized bytes to userspace. \n\nBecause the fix addresses length validation and potential buffer/integer overflow (which falls under the purview of KASAN or standard bounds checking), no uninitialized memory risks are introduced or exposed. Therefore, dedicated KMSAN fuzzing is not needed.", "NeedsKMSAN": false } Results: { "KMSANReasoning": "The patch introduces an explicit payload size check (`len \u003e MAX_PAYLOAD_LEN`) in `rust/kernel/net/netlink.rs` (`GenlMsg::put`) to prevent attribute length overflow when setting the 16-bit `nla_len` field in netlink attributes via `bindings::nla_put`. \n\nThe data serialized via `GenlMsg::put` is constrained by the `AsBytes` trait, which guarantees at the type system level that the type contains no uninitialized bytes or padding. The patch does not allocate uninitialized memory, does not read or branch on uninitialized fields, and does not expose uninitialized bytes to userspace. \n\nBecause the fix addresses length validation and potential buffer/integer overflow (which falls under the purview of KASAN or standard bounds checking), no uninitialized memory risks are introduced or exposed. Therefore, dedicated KMSAN fuzzing is not needed.", "NeedsKMSAN": false }

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