| Seq | Timestamp | Type | Name | Duration |
|---|---|---|---|---|
| 0/0 | 2026/09/28 03:35 | flow | patch-triage |
4mArgs:null Results: {
"EnableConfigs": [
"RUST",
"ANDROID_BINDER_IPC_RUST",
"BLK_DEV_RUST_NULL",
"CONFIGFS_FS"
],
"FocusSymbols": [
"rust_binder_wait",
"rust_binder_waitlcl",
"rust_binder_freeze",
"rust_binder_ioctl",
"binder_ctl_ioctl"
],
"KMSANReasoning": "The patch introduces `DropGuard` in `rust/kernel/mem.rs`, a RAII helper that wraps a value and executes a cleanup closure when dropped unless dismissed, and migrates existing usages from `ScopeGuard` to `DropGuard` in block MQ, serdev, and lock modules.\n\nThere are no uninitialized memory risks introduced:\n1. `DropGuard` wraps fully initialized values and closures via `ManuallyDrop`.\n2. No uninitialized memory, struct padding, or raw buffers are exposed or transferred across user/kernel boundaries.\n3. No bounds checks, length computations, or conditional branching based on uninitialized memory are modified.\n\nAny potential bugs resulting from drop-guard lifecycle issues (e.g., double free, use-after-free, or lock release bugs) are covered by KASAN, LOCKDEP, and standard kernel debugging facilities, not KMSAN. Therefore, a dedicated KMSAN fuzzing session is not warranted.",
"NeedsKMSAN": false,
"Reasoning": "The patch introduces a new RAII abstraction DropGuard in rust/kernel/mem.rs (replacing ScopeGuard) and integrates it into core synchronization logic (rust/kernel/sync/lock.rs do_unlocked), block layer queue/disk initialization (rust/kernel/block/mq/gen_disk.rs GenDiskBuilder::build), and serdev. Guard::do_unlocked is used by CondVar to safely unlock and relock during thread sleep/wait, which is executed directly by the Rust Android Binder driver (CONFIG_ANDROID_BINDER_IPC_RUST) during ioctl work handling and thread wait loops. GenDiskBuilder::build is executed by the Rust null block driver (CONFIG_BLK_DEV_RUST_NULL). Fuzzing is warranted to verify invariants and uncover potential concurrency/memory-management regressions.",
"WorthFuzzing": true
} |
| 1/1 | 2026/09/28 03:35 | action | read-patch-diff |
0mArgs:null Results: {
"PatchDiff": "commit 082e2ed8022f39496afa0ce36357b8aebdcbfbb4\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Mon Sep 28 03:35:24 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/rust/kernel/Kconfig.test b/rust/kernel/Kconfig.test\nindex e6a5c7a795f0f..011c72f14e2cc 100644\n--- a/rust/kernel/Kconfig.test\n+++ b/rust/kernel/Kconfig.test\n@@ -33,6 +33,16 @@ config RUST_KVEC_KUNIT_TEST\n \n \t If unsure, say N.\n \n+config RUST_DROP_GUARD_KUNIT_TEST\n+\tbool \"KUnit tests for Rust DropGuard API\" if !KUNIT_ALL_TESTS\n+\tdefault KUNIT_ALL_TESTS\n+\thelp\n+\t This option enables KUnit tests for the Rust DropGuard API.\n+\t These are only for development and testing, not for regular\n+\t kernel use cases.\n+\n+\t If unsure, say N.\n+\n config RUST_BITMAP_KUNIT_TEST\n \tbool \"KUnit tests for Rust bitmap API\" if !KUNIT_ALL_TESTS\n \tdefault KUNIT_ALL_TESTS\ndiff --git a/rust/kernel/block/mq/gen_disk.rs b/rust/kernel/block/mq/gen_disk.rs\nindex fc97dd8739746..d9019fbbb361a 100644\n--- a/rust/kernel/block/mq/gen_disk.rs\n+++ b/rust/kernel/block/mq/gen_disk.rs\n@@ -10,11 +10,12 @@\n block::mq::{Operations, TagSet},\n error::{self, from_err_ptr, Result},\n fmt::{self, Write},\n+ mem::DropGuard,\n prelude::*,\n static_lock_class,\n str::NullTerminatedFormatter,\n sync::Arc,\n- types::{ForeignOwnable, ScopeGuard},\n+ types::ForeignOwnable,\n };\n \n /// A builder for [`GenDisk`].\n@@ -102,7 +103,7 @@ pub fn build\u003cT: Operations\u003e(\n queue_data: T::QueueData,\n ) -\u003e Result\u003cGenDisk\u003cT\u003e\u003e {\n let data = queue_data.into_foreign();\n- let recover_data = ScopeGuard::new(|| {\n+ let recover_data = DropGuard::new((), |_| {\n // SAFETY: T::QueueData was created by the call to `into_foreign()` above\n drop(unsafe { T::QueueData::from_foreign(data) });\n });\n@@ -150,7 +151,7 @@ pub fn build\u003cT: Operations\u003e(\n // SAFETY: `gendisk` is a valid pointer as we initialized it above\n unsafe { (*gendisk).fops = \u0026TABLE };\n \n- let cleanup_failure = ScopeGuard::new_with_data((gendisk, data), |(gendisk, data)| {\n+ let cleanup_failure = DropGuard::new((gendisk, data), |(gendisk, data)| {\n // SAFETY: `gendisk` came from `__blk_mq_alloc_disk()` above and\n // has not been added to the VFS on this cleanup path.\n unsafe { bindings::put_disk(gendisk) };\n@@ -161,7 +162,7 @@ pub fn build\u003cT: Operations\u003e(\n \n // The failure guard now owns both pieces of cleanup; the early guard\n // must not run on this path anymore.\n- recover_data.dismiss();\n+ DropGuard::dismiss(recover_data);\n \n let mut writer = NullTerminatedFormatter::new(\n // SAFETY: `gendisk` points to a valid and initialized instance. We\n@@ -185,7 +186,7 @@ pub fn build\u003cT: Operations\u003e(\n },\n )?;\n \n- cleanup_failure.dismiss();\n+ DropGuard::dismiss(cleanup_failure);\n \n // INVARIANT: `gendisk` was initialized above.\n // INVARIANT: `gendisk` was added to the VFS via `device_add_disk` above.\ndiff --git a/rust/kernel/mem.rs b/rust/kernel/mem.rs\nindex f2d4cdf87d00b..17807c8e67ac0 100644\n--- a/rust/kernel/mem.rs\n+++ b/rust/kernel/mem.rs\n@@ -4,6 +4,95 @@\n \n use crate::prelude::*;\n \n+use core::{\n+ mem::ManuallyDrop,\n+ ops::{Deref, DerefMut},\n+};\n+\n+/// Wraps a value and runs a closure when dropped.\n+///\n+/// This is useful for running cleanup code when leaving a scope.\n+///\n+/// The [`DropGuard::dismiss`] function can be used to take ownership of the wrapped\n+/// value without running the cleanup function.\n+#[doc(alias = \"ScopeGuard\")]\n+#[doc(alias = \"defer\")]\n+pub struct DropGuard\u003cT, F\u003e\n+where\n+ F: FnOnce(T),\n+{\n+ inner: ManuallyDrop\u003cT\u003e,\n+ f: ManuallyDrop\u003cF\u003e,\n+}\n+\n+impl\u003cT, F\u003e DropGuard\u003cT, F\u003e\n+where\n+ F: FnOnce(T),\n+{\n+ /// Creates a new `DropGuard`.\n+ #[inline]\n+ #[must_use]\n+ pub fn new(inner: T, f: F) -\u003e Self {\n+ Self {\n+ inner: ManuallyDrop::new(inner),\n+ f: ManuallyDrop::new(f),\n+ }\n+ }\n+\n+ /// Consumes the `DropGuard`, returning the wrapped value without\n+ /// running the cleanup function.\n+ #[inline]\n+ pub fn dismiss(guard: Self) -\u003e T {\n+ let mut guard = ManuallyDrop::new(guard);\n+\n+ // SAFETY: We have taken ownership of the guard and prevent its destructor from running.\n+ let value = unsafe { ManuallyDrop::take(\u0026mut guard.inner) };\n+\n+ // SAFETY: We have taken ownership of the guard.\n+ unsafe { ManuallyDrop::drop(\u0026mut guard.f) };\n+\n+ value\n+ }\n+}\n+\n+impl\u003cT, F\u003e Deref for DropGuard\u003cT, F\u003e\n+where\n+ F: FnOnce(T),\n+{\n+ type Target = T;\n+\n+ #[inline]\n+ fn deref(\u0026self) -\u003e \u0026T {\n+ \u0026self.inner\n+ }\n+}\n+\n+impl\u003cT, F\u003e DerefMut for DropGuard\u003cT, F\u003e\n+where\n+ F: FnOnce(T),\n+{\n+ #[inline]\n+ fn deref_mut(\u0026mut self) -\u003e \u0026mut T {\n+ \u0026mut self.inner\n+ }\n+}\n+\n+impl\u003cT, F\u003e Drop for DropGuard\u003cT, F\u003e\n+where\n+ F: FnOnce(T),\n+{\n+ #[inline]\n+ fn drop(\u0026mut self) {\n+ // SAFETY: `DropGuard` is in the process of being dropped.\n+ let inner = unsafe { ManuallyDrop::take(\u0026mut self.inner) };\n+\n+ // SAFETY: `DropGuard` is in the process of being dropped.\n+ let f = unsafe { ManuallyDrop::take(\u0026mut self.f) };\n+\n+ f(inner);\n+ }\n+}\n+\n /// Transmute between two types.\n ///\n /// Use this instead of [`core::mem::transmute`] when it is known that sizes are identical but this\n@@ -232,3 +321,37 @@ unsafe impl AsReprMut for $signed {}\n // `usize` is not normalized to particular integer for portability.\n usize isize,\n }\n+\n+#[cfg(CONFIG_RUST_DROP_GUARD_KUNIT_TEST)]\n+#[macros::kunit_tests(rust_drop_guard)]\n+mod tests {\n+ use super::*;\n+\n+ #[test]\n+ fn test_drop_runs_cleanup() {\n+ let mut cleaned = false;\n+\n+ {\n+ let _guard = DropGuard::new(42, |value| {\n+ assert_eq!(value, 42);\n+ cleaned = true;\n+ });\n+ }\n+\n+ assert!(cleaned);\n+ }\n+\n+ #[test]\n+ fn test_dismiss_returns_value_without_cleanup() {\n+ let mut cleaned = false;\n+\n+ let guard = DropGuard::new(42, |_| {\n+ cleaned = true;\n+ });\n+\n+ let value = DropGuard::dismiss(guard);\n+\n+ assert_eq!(value, 42);\n+ assert!(!cleaned);\n+ }\n+}\ndiff --git a/rust/kernel/serdev.rs b/rust/kernel/serdev.rs\nindex 17ca504b7f8d6..dd43b159b4616 100644\n--- a/rust/kernel/serdev.rs\n+++ b/rust/kernel/serdev.rs\n@@ -13,6 +13,7 @@\n to_result,\n VTABLE_DEFAULT_ERROR, //\n },\n+ mem::DropGuard,\n new_mutex,\n of,\n prelude::*,\n@@ -21,10 +22,7 @@\n Mutex, //\n },\n time::Jiffies,\n- types::{\n- Opaque,\n- ScopeGuard, //\n- }, //\n+ types::Opaque, //\n };\n \n use core::{\n@@ -174,7 +172,7 @@ extern \"C\" fn probe_callback(sdev: *mut bindings::serdev_device) -\u003e kernel::ffi:\n }))?;\n // SAFETY: We just set drvdata to `PrivateData\u003c'_, T\u003e`.\n let private_data = unsafe { sdev.as_ref().drvdata_borrow::\u003cPrivateData\u003c'_, T\u003e\u003e() };\n- let private_data = ScopeGuard::new_with_data(private_data, |_| {\n+ let private_data = DropGuard::new(private_data, |_| {\n // SAFETY: We just set drvdata to `PrivateData\u003c'_, T\u003e`.\n drop(unsafe { sdev.as_ref().drvdata_obtain::\u003cPrivateData\u003c'_, T\u003e\u003e() });\n });\n@@ -204,7 +202,7 @@ extern \"C\" fn probe_callback(sdev: *mut bindings::serdev_device) -\u003e kernel::ffi:\n drop(active);\n \n result.map(|()| {\n- private_data.dismiss();\n+ DropGuard::dismiss(private_data);\n 0\n })\n })\ndiff --git a/rust/kernel/sync/lock.rs b/rust/kernel/sync/lock.rs\nindex 10b6b5e9b024f..15f9cbe76c8d9 100644\n--- a/rust/kernel/sync/lock.rs\n+++ b/rust/kernel/sync/lock.rs\n@@ -7,8 +7,9 @@\n \n use super::LockClassKey;\n use crate::{\n+ mem::DropGuard,\n str::{CStr, CStrExt as _},\n- types::{NotThreadSafe, Opaque, ScopeGuard},\n+ types::{NotThreadSafe, Opaque},\n };\n use core::{cell::UnsafeCell, marker::PhantomPinned, pin::Pin};\n use pin_init::{pin_data, pin_init, PinInit, Wrapper};\n@@ -242,7 +243,7 @@ pub(crate) fn do_unlocked\u003cU\u003e(\u0026mut self, cb: impl FnOnce() -\u003e U) -\u003e U {\n // SAFETY: The caller owns the lock, so it is safe to unlock it.\n unsafe { B::unlock(self.lock.state.get(), \u0026self.state) };\n \n- let _relock = ScopeGuard::new(||\n+ let _relock = DropGuard::new((), |_|\n // SAFETY: The lock was just unlocked above and is being relocked now.\n unsafe { B::relock(self.lock.state.get(), \u0026mut self.state) });\n \n"
} |
| 2/1 | 2026/09/28 03:35 | agent | patch-evaluator |
4mModel:core Args: null Results: {
"EnableConfigs": [
"RUST",
"ANDROID_BINDER_IPC_RUST",
"BLK_DEV_RUST_NULL",
"CONFIGFS_FS"
],
"FocusSymbols": [
"rust_binder_wait",
"rust_binder_waitlcl",
"rust_binder_freeze",
"rust_binder_ioctl",
"binder_ctl_ioctl"
],
"Reasoning": "The patch introduces a new RAII abstraction DropGuard in rust/kernel/mem.rs (replacing ScopeGuard) and integrates it into core synchronization logic (rust/kernel/sync/lock.rs do_unlocked), block layer queue/disk initialization (rust/kernel/block/mq/gen_disk.rs GenDiskBuilder::build), and serdev. Guard::do_unlocked is used by CondVar to safely unlock and relock during thread sleep/wait, which is executed directly by the Rust Android Binder driver (CONFIG_ANDROID_BINDER_IPC_RUST) during ioctl work handling and thread wait loops. GenDiskBuilder::build is executed by the Rust null block driver (CONFIG_BLK_DEV_RUST_NULL). Fuzzing is warranted to verify invariants and uncover potential concurrency/memory-management regressions.",
"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 082e2ed8022f39496afa0ce36357b8aebdcbfbb4
Author: syz-cluster <triage@syzkaller.com>
Date: Mon Sep 28 03:35:24 2026 +0000
syz-cluster: applied patch under review
diff --git a/rust/kernel/Kconfig.test b/rust/kernel/Kconfig.test
index e6a5c7a795f0f..011c72f14e2cc 100644
--- a/rust/kernel/Kconfig.test
+++ b/rust/kernel/Kconfig.test
@@ -33,6 +33,16 @@ config RUST_KVEC_KUNIT_TEST
If unsure, say N.
+config RUST_DROP_GUARD_KUNIT_TEST
+ bool "KUnit tests for Rust DropGuard API" if !KUNIT_ALL_TESTS
+ default KUNIT_ALL_TESTS
+ help
+ This option enables KUnit tests for the Rust DropGuard API.
+ These are only for development and testing, not for regular
+ kernel use cases.
+
+ If unsure, say N.
+
config RUST_BITMAP_KUNIT_TEST
bool "KUnit tests for Rust bitmap API" if !KUNIT_ALL_TESTS
default KUNIT_ALL_TESTS
diff --git a/rust/kernel/block/mq/gen_disk.rs b/rust/kernel/block/mq/gen_disk.rs
index fc97dd8739746..d9019fbbb361a 100644
--- a/rust/kernel/block/mq/gen_disk.rs
+++ b/rust/kernel/block/mq/gen_disk.rs
@@ -10,11 +10,12 @@
block::mq::{Operations, TagSet},
error::{self, from_err_ptr, Result},
fmt::{self, Write},
+ mem::DropGuard,
prelude::*,
static_lock_class,
str::NullTerminatedFormatter,
sync::Arc,
- types::{ForeignOwnable, ScopeGuard},
+ types::ForeignOwnable,
};
/// A builder for [`GenDisk`].
@@ -102,7 +103,7 @@ pub fn build<T: Operations>(
queue_data: T::QueueData,
) -> Result<GenDisk<T>> {
let data = queue_data.into_foreign();
- let recover_data = ScopeGuard::new(|| {
+ let recover_data = DropGuard::new((), |_| {
// SAFETY: T::QueueData was created by the call to `into_foreign()` above
drop(unsafe { T::QueueData::from_foreign(data) });
});
@@ -150,7 +151,7 @@ pub fn build<T: Operations>(
// SAFETY: `gendisk` is a valid pointer as we initialized it above
unsafe { (*gendisk).fops = &TABLE };
- let cleanup_failure = ScopeGuard::new_with_data((gendisk, data), |(gendisk, data)| {
+ let cleanup_failure = DropGuard::new((gendisk, data), |(gendisk, data)| {
// SAFETY: `gendisk` came from `__blk_mq_alloc_disk()` above and
// has not been added to the VFS on this cleanup path.
unsafe { bindings::put_disk(gendisk) };
@@ -161,7 +162,7 @@ pub fn build<T: Operations>(
// The failure guard now owns both pieces of cleanup; the early guard
// must not run on this path anymore.
- recover_data.dismiss();
+ DropGuard::dismiss(recover_data);
let mut writer = NullTerminatedFormatter::new(
// SAFETY: `gendisk` points to a valid and initialized instance. We
@@ -185,7 +186,7 @@ pub fn build<T: Operations>(
},
)?;
- cleanup_failure.dismiss();
+ DropGuard::dismiss(cleanup_failure);
// INVARIANT: `gendisk` was initialized above.
// INVARIANT: `gendisk` was added to the VFS via `device_add_disk` above.
diff --git a/rust/kernel/mem.rs b/rust/kernel/mem.rs
index f2d4cdf87d00b..17807c8e67ac0 100644
--- a/rust/kernel/mem.rs
+++ b/rust/kernel/mem.rs
@@ -4,6 +4,95 @@
use crate::prelude::*;
+use core::{
+ mem::ManuallyDrop,
+ ops::{Deref, DerefMut},
+};
+
+/// Wraps a value and runs a closure when dropped.
+///
+/// This is useful for running cleanup code when leaving a scope.
+///
+/// The [`DropGuard::dismiss`] function can be used to take ownership of the wrapped
+/// value without running the cleanup function.
+#[doc(alias = "ScopeGuard")]
+#[doc(alias = "defer")]
+pub struct DropGuard<T, F>
+where
+ F: FnOnce(T),
+{
+ inner: ManuallyDrop<T>,
+ f: ManuallyDrop<F>,
+}
+
+impl<T, F> DropGuard<T, F>
+where
+ F: FnOnce(T),
+{
+ /// Creates a new `DropGuard`.
+ #[inline]
+ #[must_use]
+ pub fn new(inner: T, f: F) -> Self {
+ Self {
+ inner: ManuallyDrop::new(inner),
+ f: ManuallyDrop::new(f),
+ }
+ }
+
+ /// Consumes the `DropGuard`, returning the wrapped value without
+ /// running the cleanup function.
+ #[inline]
+ pub fn dismiss(guard: Self) -> T {
+ let mut guard = ManuallyDrop::new(guard);
+
+ // SAFETY: We have taken ownership of the guard and prevent its destructor from running.
+ let value = unsafe { ManuallyDrop::take(&mut guard.inner) };
+
+ // SAFETY: We have taken ownership of the guard.
+ unsafe { ManuallyDrop::drop(&mut guard.f) };
+
+ value
+ }
+}
+
+impl<T, F> Deref for DropGuard<T, F>
+where
+ F: FnOnce(T),
+{
+ type Target = T;
+
+ #[inline]
+ fn deref(&self) -> &T {
+ &self.inner
+ }
+}
+
+impl<T, F> DerefMut for DropGuard<T, F>
+where
+ F: FnOnce(T),
+{
+ #[inline]
+ fn deref_mut(&mut self) -> &mut T {
+ &mut self.inner
+ }
+}
+
+impl<T, F> Drop for DropGuard<T, F>
+where
+ F: FnOnce(T),
+{
+ #[inline]
+ fn drop(&mut self) {
+ // SAFETY: `DropGuard` is in the process of being dropped.
+ let inner = unsafe { ManuallyDrop::take(&mut self.inner) };
+
+ // SAFETY: `DropGuard` is in the process of being dropped.
+ let f = unsafe { ManuallyDrop::take(&mut self.f) };
+
+ f(inner);
+ }
+}
+
/// Transmute between two types.
///
/// Use this instead of [`core::mem::transmute`] when it is known that sizes are identical but this
@@ -232,3 +321,37 @@ unsafe impl AsReprMut for $signed {}
// `usize` is not normalized to particular integer for portability.
usize isize,
}
+
+#[cfg(CONFIG_RUST_DROP_GUARD_KUNIT_TEST)]
+#[macros::kunit_tests(rust_drop_guard)]
+mod tests {
+ use super::*;
+
+ #[test]
+ fn test_drop_runs_cleanup() {
+ let mut cleaned = false;
+
+ {
+ let _guard = DropGuard::new(42, |value| {
+ assert_eq!(value, 42);
+ cleaned = true;
+ });
+ }
+
+ assert!(cleaned);
+ }
+
+ #[test]
+ fn test_dismiss_returns_value_without_cleanup() {
+ let mut cleaned = false;
+
+ let guard = DropGuard::new(42, |_| {
+ cleaned = true;
+ });
+
+ let value = DropGuard::dismiss(guard);
+
+ assert_eq!(value, 42);
+ assert!(!cleaned);
+ }
+}
diff --git a/rust/kernel/serdev.rs b/rust/kernel/serdev.rs
index 17ca504b7f8d6..dd43b159b4616 100644
--- a/rust/kernel/serdev.rs
+++ b/rust/kernel/serdev.rs
@@ -13,6 +13,7 @@
to_result,
VTABLE_DEFAULT_ERROR, //
},
+ mem::DropGuard,
new_mutex,
of,
prelude::*,
@@ -21,10 +22,7 @@
Mutex, //
},
time::Jiffies,
- types::{
- Opaque,
- ScopeGuard, //
- }, //
+ types::Opaque, //
};
use core::{
@@ -174,7 +172,7 @@ extern "C" fn probe_callback(sdev: *mut bindings::serdev_device) -> kernel::ffi:
}))?;
// SAFETY: We just set drvdata to `PrivateData<'_, T>`.
let private_data = unsafe { sdev.as_ref().drvdata_borrow::<PrivateData<'_, T>>() };
- let private_data = ScopeGuard::new_with_data(private_data, |_| {
+ let private_data = DropGuard::new(private_data, |_| {
// SAFETY: We just set drvdata to `PrivateData<'_, T>`.
drop(unsafe { sdev.as_ref().drvdata_obtain::<PrivateData<'_, T>>() });
});
@@ -204,7 +202,7 @@ extern "C" fn probe_callback(sdev: *mut bindings::serdev_device) -> kernel::ffi:
drop(active);
result.map(|()| {
- private_data.dismiss();
+ DropGuard::dismiss(private_data);
0
})
})
diff --git a/rust/kernel/sync/lock.rs b/rust/kernel/sync/lock.rs
index 10b6b5e9b024f..15f9cbe76c8d9 100644
--- a/rust/kernel/sync/lock.rs
+++ b/rust/kernel/sync/lock.rs
@@ -7,8 +7,9 @@
use super::LockClassKey;
use crate::{
+ mem::DropGuard,
str::{CStr, CStrExt as _},
- types::{NotThreadSafe, Opaque, ScopeGuard},
+ types::{NotThreadSafe, Opaque},
};
use core::{cell::UnsafeCell, marker::PhantomPinned, pin::Pin};
use pin_init::{pin_data, pin_init, PinInit, Wrapper};
@@ -242,7 +243,7 @@ pub(crate) fn do_unlocked<U>(&mut self, cb: impl FnOnce() -> U) -> U {
// SAFETY: The caller owns the lock, so it is safe to unlock it.
unsafe { B::unlock(self.lock.state.get(), &self.state) };
- let _relock = ScopeGuard::new(||
+ let _relock = DropGuard::new((), |_|
// SAFETY: The lock was just unlocked above and is being relocked now.
unsafe { B::relock(self.lock.state.get(), &mut self.state) });
|
| 3/2 | 2026/09/28 03:35 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 5648 output: 24 thoughts: 233 Thoughts: **Analyzing the Syzkaller Patch for Rust Kernel Changes** Okay, so I'm looking at this patch for syzkaller fuzzing, and my immediate instinct is to dig into the details. Let's see... the diff summary shows a few key areas: `Kconfig.test`, `gen_disk.rs`, `mem.rs`, `serdev.rs`, and `lock.rs`. Right away, the change from `ScopeGuard` to `DropGuard` jumps out. That's the core of this, isn't it? I need to understand what `ScopeGuard` was doing. Is this a simple refactoring, or is there some deeper rationale here? And is it only a rename, or are there functional differences? My immediate concern is reachability. Is this code even *reachable* in a kernel that syzkaller will touch? Are the paths through this code used? I need to know what uses these components, what drivers rely on them. I'm going to quickly grep through the surrounding files for both `DropGuard` and `ScopeGuard` to get a feel for how they're being used. That'll inform my evaluation and whether this patch is useful for fuzzing. This should give me some context on how critical or impactful these changes are. |
| 4/2 | 2026/09/28 03:35 | tool | grepper |
0mArgs:{
"Expression": "ScopeGuard",
"PathPrefix": "rust/"
}Results: {
"Output": "rust/kernel/mem.rs-17-/// value without running the cleanup function.\nrust/kernel/mem.rs:18:#[doc(alias = \"ScopeGuard\")]\nrust/kernel/mem.rs-19-#[doc(alias = \"defer\")]\n--\nrust/kernel/types.rs=152= unsafe fn borrow_mut\u003c'a\u003e(_: *mut c_void) -\u003e Self::BorrowedMut\u003c'a\u003e {}\n--\nrust/kernel/types.rs-156-///\nrust/kernel/types.rs:157:/// The [`ScopeGuard::dismiss`] function prevents the cleanup function from running.\nrust/kernel/types.rs-158-///\n--\nrust/kernel/types.rs-164-/// ```\nrust/kernel/types.rs:165:/// # use kernel::types::ScopeGuard;\nrust/kernel/types.rs-166-/// fn example1(arg: bool) {\nrust/kernel/types.rs:167:/// let _log = ScopeGuard::new(|| pr_info!(\"example1 completed\\n\"));\nrust/kernel/types.rs-168-///\n--\nrust/kernel/types.rs-183-/// ```\nrust/kernel/types.rs:184:/// # use kernel::types::ScopeGuard;\nrust/kernel/types.rs-185-/// fn example2(arg: bool) {\nrust/kernel/types.rs:186:/// let log = ScopeGuard::new(|| pr_info!(\"example2 returned early\\n\"));\nrust/kernel/types.rs-187-///\n--\nrust/kernel/types.rs-202-/// In the example below, we need a mutable object (the vector) to be accessible within the log\nrust/kernel/types.rs:203:/// function, so we wrap it in the [`ScopeGuard`]:\nrust/kernel/types.rs-204-///\nrust/kernel/types.rs-205-/// ```\nrust/kernel/types.rs:206:/// # use kernel::types::ScopeGuard;\nrust/kernel/types.rs-207-/// fn example3(arg: bool) -\u003e Result {\nrust/kernel/types.rs-208-/// let mut vec =\nrust/kernel/types.rs:209:/// ScopeGuard::new_with_data(KVec::new(), |v| pr_info!(\"vec had {} elements\\n\", v.len()));\nrust/kernel/types.rs-210-///\n--\nrust/kernel/types.rs-225-/// The value stored in the struct is nearly always `Some(_)`, except between\nrust/kernel/types.rs:226:/// [`ScopeGuard::dismiss`] and [`ScopeGuard::drop`]: in this case, it will be `None` as the value\nrust/kernel/types.rs:227:/// will have been returned to the caller. Since [`ScopeGuard::dismiss`] consumes the guard,\nrust/kernel/types.rs-228-/// callers won't be able to use it anymore.\nrust/kernel/types.rs:229:pub struct ScopeGuard\u003cT, F: FnOnce(T)\u003e(Option\u003c(T, F)\u003e);\nrust/kernel/types.rs-230-\nrust/kernel/types.rs:231:impl\u003cT, F: FnOnce(T)\u003e ScopeGuard\u003cT, F\u003e {\nrust/kernel/types.rs-232- /// Creates a new guarded object wrapping the given data and with the given cleanup function.\n--\nrust/kernel/types.rs=239= pub fn dismiss(mut self) -\u003e T {\n--\nrust/kernel/types.rs-245-\nrust/kernel/types.rs:246:impl ScopeGuard\u003c(), fn(())\u003e {\nrust/kernel/types.rs-247- /// Creates a new guarded object with the given cleanup function.\nrust/kernel/types.rs:248: pub fn new(cleanup: impl FnOnce()) -\u003e ScopeGuard\u003c(), impl FnOnce(())\u003e {\nrust/kernel/types.rs:249: ScopeGuard::new_with_data((), move |()| cleanup())\nrust/kernel/types.rs-250- }\n--\nrust/kernel/types.rs-252-\nrust/kernel/types.rs:253:impl\u003cT, F: FnOnce(T)\u003e Deref for ScopeGuard\u003cT, F\u003e {\nrust/kernel/types.rs-254- type Target = T;\n--\nrust/kernel/types.rs=256= fn deref(\u0026self) -\u003e \u0026T {\n--\nrust/kernel/types.rs-261-\nrust/kernel/types.rs:262:impl\u003cT, F: FnOnce(T)\u003e DerefMut for ScopeGuard\u003cT, F\u003e {\nrust/kernel/types.rs-263- fn deref_mut(\u0026mut self) -\u003e \u0026mut T {\n--\nrust/kernel/types.rs-268-\nrust/kernel/types.rs:269:impl\u003cT, F: FnOnce(T)\u003e Drop for ScopeGuard\u003cT, F\u003e {\nrust/kernel/types.rs-270- fn drop(\u0026mut self) {\n"
} |
| 5/2 | 2026/09/28 03:35 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 7432 output: 26 thoughts: 58 Thoughts: Okay, let's dive into this code. **Investigating DropGuard and ScopeGuard Usage** Alright, my immediate thought is to trace the utilization of `DropGuard` and `ScopeGuard` within this codebase. I need to understand where these guards are being employed and for what purpose. I'll start by looking for their direct callers, focusing on functions like `do_unlocked`, `gen_disk`, `serdev`, and any other candidates I can identify through a quick search. My first port of call will be to examine the `do_unlocked` function, and I'm going to look there in `rust/kernel/sync/lock.rs`. This should shed some light on one specific instance. From there, I'll branch out, examining other callers to see if any patterns emerge in their application, or common usage scenarios. |
| 6/2 | 2026/09/28 03:35 | tool | grepper |
0mArgs:{
"Expression": "do_unlocked",
"PathPrefix": "rust/"
}Results: {
"Output": "rust/kernel/sync/condvar.rs=114= fn wait_internal\u003cT: ?Sized, B: Backend\u003e(\n--\nrust/kernel/sync/condvar.rs-130- // SAFETY: Switches to another thread. The timeout can be any number.\nrust/kernel/sync/condvar.rs:131: let ret = guard.do_unlocked(|| unsafe { bindings::schedule_timeout(timeout_in_jiffies) });\nrust/kernel/sync/condvar.rs-132-\n--\nrust/kernel/sync/lock.rs=238= pub fn lock_ref(\u0026self) -\u003e \u0026'a Lock\u003cT, B\u003e {\n--\nrust/kernel/sync/lock.rs-241-\nrust/kernel/sync/lock.rs:242: pub(crate) fn do_unlocked\u003cU\u003e(\u0026mut self, cb: impl FnOnce() -\u003e U) -\u003e U {\nrust/kernel/sync/lock.rs-243- // SAFETY: The caller owns the lock, so it is safe to unlock it.\n"
} |
| 7/2 | 2026/09/28 03:35 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 7963 output: 24 thoughts: 47 Thoughts: Here's my take on the thought process: **Diving into Rust's `condvar.rs` and its Dependencies** Okay, so I'm digging into the internals of the `condvar` implementation in Rust, specifically looking at `rust/kernel/sync/condvar.rs`. I see that the `wait_internal` function leverages `guard.do_unlocked`. That's a key piece of the puzzle. My mind immediately goes to, "What are the common users of `CondVar` within the Rust ecosystem? Where is this commonly used in practice?". To get a handle on that, I'm thinking, "Let's use a `grep` to quickly identify the locations where the `CondVar` struct is directly instantiated and used." This kind of broad search should give me a good lay of the land, helping me trace the signal flow and understand its practical use cases better. The goal is to quickly map out the dependency graph related to `CondVar`. |
| 8/2 | 2026/09/28 03:35 | tool | grepper |
0mArgs:{
"Expression": "CondVar",
"PathPrefix": "rust/"
}Results: {
"Output": "rust/kernel/sync.rs-27-pub use completion::Completion;\nrust/kernel/sync.rs:28:pub use condvar::{new_condvar, CondVar, CondVarTimeoutResult};\nrust/kernel/sync.rs-29-pub use lock::global::{global_lock, GlobalGuard, GlobalLock, GlobalLockBackend, GlobalLockedBy};\n--\nrust/kernel/sync/condvar.rs-20-\nrust/kernel/sync/condvar.rs:21:/// Creates a [`CondVar`] initialiser with the given name and a newly-created lock class.\nrust/kernel/sync/condvar.rs-22-#[macro_export]\nrust/kernel/sync/condvar.rs=23=macro_rules! new_condvar {\nrust/kernel/sync/condvar.rs-24- ($($name:literal)?) =\u003e {\nrust/kernel/sync/condvar.rs:25: $crate::sync::CondVar::new($crate::optional_name!($($name)?), $crate::static_lock_class!())\nrust/kernel/sync/condvar.rs-26- };\n--\nrust/kernel/sync/condvar.rs-33-/// atomically release the given lock and go to sleep. It reacquires the lock when it wakes up. And\nrust/kernel/sync/condvar.rs:34:/// it wakes up when notified by another thread (via [`CondVar::notify_one`] or\nrust/kernel/sync/condvar.rs:35:/// [`CondVar::notify_all`]) or because the thread received a signal. It may also wake up\nrust/kernel/sync/condvar.rs-36-/// spuriously.\nrust/kernel/sync/condvar.rs-37-///\nrust/kernel/sync/condvar.rs:38:/// Instances of [`CondVar`] need a lock class and to be pinned. The recommended way to create such\nrust/kernel/sync/condvar.rs-39-/// instances is with the [`pin_init`](pin_init::pin_init!) and [`new_condvar`] macros.\n--\nrust/kernel/sync/condvar.rs-45-/// ```\nrust/kernel/sync/condvar.rs:46:/// use kernel::sync::{new_condvar, new_mutex, CondVar, Mutex};\nrust/kernel/sync/condvar.rs-47-///\n--\nrust/kernel/sync/condvar.rs-53-/// #[pin]\nrust/kernel/sync/condvar.rs:54:/// value_changed: CondVar,\nrust/kernel/sync/condvar.rs-55-/// }\n--\nrust/kernel/sync/condvar.rs-81-#[pin_data]\nrust/kernel/sync/condvar.rs:82:pub struct CondVar {\nrust/kernel/sync/condvar.rs-83- #[pin]\n--\nrust/kernel/sync/condvar.rs-93-\nrust/kernel/sync/condvar.rs:94:// SAFETY: `CondVar` only uses a `struct wait_queue_head`, which is safe to use on any thread.\nrust/kernel/sync/condvar.rs:95:unsafe impl Send for CondVar {}\nrust/kernel/sync/condvar.rs-96-\nrust/kernel/sync/condvar.rs:97:// SAFETY: `CondVar` only uses a `struct wait_queue_head`, which is safe to use on multiple threads\nrust/kernel/sync/condvar.rs-98-// concurrently.\nrust/kernel/sync/condvar.rs:99:unsafe impl Sync for CondVar {}\nrust/kernel/sync/condvar.rs-100-\nrust/kernel/sync/condvar.rs:101:impl CondVar {\nrust/kernel/sync/condvar.rs-102- /// Constructs a new condvar initialiser.\n--\nrust/kernel/sync/condvar.rs=114= fn wait_internal\u003cT: ?Sized, B: Backend\u003e(\n--\nrust/kernel/sync/condvar.rs-142- /// thread to sleep, reacquiring the lock on wake up. It wakes up when notified by\nrust/kernel/sync/condvar.rs:143: /// [`CondVar::notify_one`] or [`CondVar::notify_all`]. Note that it may also wake up\nrust/kernel/sync/condvar.rs-144- /// spuriously.\nrust/kernel/sync/condvar.rs=145= pub fn wait\u003cT: ?Sized, B: Backend\u003e(\u0026self, guard: \u0026mut Guard\u003c'_, T, B\u003e) {\n--\nrust/kernel/sync/condvar.rs-150- ///\nrust/kernel/sync/condvar.rs:151: /// Similar to [`CondVar::wait`], except that the wait is interruptible. That is, the thread may\nrust/kernel/sync/condvar.rs-152- /// wake up due to signals. It may also wake up spuriously.\n--\nrust/kernel/sync/condvar.rs=168= pub fn wait_interruptible_freezable\u003cT: ?Sized, B: Backend\u003e(\n--\nrust/kernel/sync/condvar.rs-182- /// Atomically releases the given lock (whose ownership is proven by the guard) and puts the\nrust/kernel/sync/condvar.rs:183: /// thread to sleep. It wakes up when notified by [`CondVar::notify_one`] or\nrust/kernel/sync/condvar.rs:184: /// [`CondVar::notify_all`], or when a timeout occurs, or when the thread receives a signal.\nrust/kernel/sync/condvar.rs-185- #[must_use = \"wait_interruptible_timeout returns if a signal is pending, so the caller must check the return value\"]\nrust/kernel/sync/condvar.rs=186= pub fn wait_interruptible_timeout\u003cT: ?Sized, B: Backend\u003e(\n--\nrust/kernel/sync/condvar.rs-189- jiffies: Jiffies,\nrust/kernel/sync/condvar.rs:190: ) -\u003e CondVarTimeoutResult {\nrust/kernel/sync/condvar.rs-191- let jiffies = jiffies.try_into().unwrap_or(MAX_SCHEDULE_TIMEOUT);\n--\nrust/kernel/sync/condvar.rs-194- match (res as Jiffies, crate::current!().signal_pending()) {\nrust/kernel/sync/condvar.rs:195: (jiffies, true) =\u003e CondVarTimeoutResult::Signal { jiffies },\nrust/kernel/sync/condvar.rs:196: (0, false) =\u003e CondVarTimeoutResult::Timeout,\nrust/kernel/sync/condvar.rs:197: (jiffies, false) =\u003e CondVarTimeoutResult::Woken { jiffies },\nrust/kernel/sync/condvar.rs-198- }\n--\nrust/kernel/sync/condvar.rs=239= pub fn notify_all(\u0026self) {\n--\nrust/kernel/sync/condvar.rs-244-/// The return type of `wait_timeout`.\nrust/kernel/sync/condvar.rs:245:pub enum CondVarTimeoutResult {\nrust/kernel/sync/condvar.rs-246- /// The timeout was reached.\n--\nrust/kernel/sync/lock/spinlock.rs=391= struct Test {\n--\nrust/kernel/sync/lock/spinlock.rs-395- #[pin]\nrust/kernel/sync/lock/spinlock.rs:396: state_changed: CondVar,\nrust/kernel/sync/lock/spinlock.rs-397-\nrust/kernel/sync/lock/spinlock.rs-398- #[pin]\nrust/kernel/sync/lock/spinlock.rs:399: waiter_state_changed: CondVar,\nrust/kernel/sync/lock/spinlock.rs-400-\n--\nrust/kernel/sync/poll.rs-13- rcu::synchronize_rcu,\nrust/kernel/sync/poll.rs:14: CondVar,\nrust/kernel/sync/poll.rs-15- LockClassKey, //\n--\nrust/kernel/sync/poll.rs-24-\nrust/kernel/sync/poll.rs:25:/// Creates a [`PollCondVar`] initialiser with the given name and a newly-created lock class.\nrust/kernel/sync/poll.rs-26-#[macro_export]\nrust/kernel/sync/poll.rs=27=macro_rules! new_poll_condvar {\nrust/kernel/sync/poll.rs-28- ($($name:literal)?) =\u003e {\nrust/kernel/sync/poll.rs:29: $crate::sync::poll::PollCondVar::new(\nrust/kernel/sync/poll.rs-30- $crate::optional_name!($($name)?), $crate::static_lock_class!()\n--\nrust/kernel/sync/poll.rs=52= pub unsafe fn from_raw(table: *mut bindings::poll_table) -\u003e Self {\n--\nrust/kernel/sync/poll.rs-59-\nrust/kernel/sync/poll.rs:60: /// Register this [`PollTable`] with the provided [`PollCondVar`], so that it can be notified\nrust/kernel/sync/poll.rs-61- /// using the condition variable.\nrust/kernel/sync/poll.rs:62: pub fn register_wait(\u0026self, file: \u0026File, cv: \u0026PollCondVar) {\nrust/kernel/sync/poll.rs-63- // SAFETY:\n--\nrust/kernel/sync/poll.rs-65- // * `self.table` is null or references a valid poll_table for the duration of this call.\nrust/kernel/sync/poll.rs:66: // * Since `PollCondVar` is pinned, its destructor is guaranteed to run before the memory\nrust/kernel/sync/poll.rs-67- // containing `cv.wait_queue_head` is invalidated. Since the destructor clears all\n--\nrust/kernel/sync/poll.rs-74-\nrust/kernel/sync/poll.rs:75:/// A wrapper around [`CondVar`] that makes it usable with [`PollTable`].\nrust/kernel/sync/poll.rs-76-///\nrust/kernel/sync/poll.rs:77:/// [`CondVar`]: crate::sync::CondVar\nrust/kernel/sync/poll.rs-78-#[pin_data(PinnedDrop)]\nrust/kernel/sync/poll.rs-79-#[repr(transparent)]\nrust/kernel/sync/poll.rs:80:pub struct PollCondVar {\nrust/kernel/sync/poll.rs-81- #[pin]\nrust/kernel/sync/poll.rs:82: inner: CondVar,\nrust/kernel/sync/poll.rs-83-}\nrust/kernel/sync/poll.rs-84-\nrust/kernel/sync/poll.rs:85:impl PollCondVar {\nrust/kernel/sync/poll.rs-86- /// Constructs a new condvar initialiser.\nrust/kernel/sync/poll.rs=87= pub fn new(name: \u0026'static CStr, key: Pin\u003c\u0026'static LockClassKey\u003e) -\u003e impl PinInit\u003cSelf\u003e {\nrust/kernel/sync/poll.rs-88- pin_init!(Self {\nrust/kernel/sync/poll.rs:89: inner \u003c- CondVar::new(name, key),\nrust/kernel/sync/poll.rs-90- })\n--\nrust/kernel/sync/poll.rs-93-\nrust/kernel/sync/poll.rs:94:// Make the `CondVar` methods callable on `PollCondVar`.\nrust/kernel/sync/poll.rs:95:impl Deref for PollCondVar {\nrust/kernel/sync/poll.rs:96: type Target = CondVar;\nrust/kernel/sync/poll.rs-97-\nrust/kernel/sync/poll.rs:98: fn deref(\u0026self) -\u003e \u0026CondVar {\nrust/kernel/sync/poll.rs-99- \u0026self.inner\n--\nrust/kernel/sync/poll.rs-103-#[pinned_drop]\nrust/kernel/sync/poll.rs:104:impl PinnedDrop for PollCondVar {\nrust/kernel/sync/poll.rs-105- #[inline]\nrust/kernel/sync/poll.rs=106= fn drop(self: Pin\u003c\u0026mut Self\u003e) {\n--\nrust/kernel/sync/poll.rs-116-\nrust/kernel/sync/poll.rs:117:/// A [`KBox\u003cPollCondVar\u003e`] that uses `kfree_rcu`.\nrust/kernel/sync/poll.rs-118-///\nrust/kernel/sync/poll.rs:119:/// [`KBox\u003cPollCondVar\u003e`]: PollCondVar\nrust/kernel/sync/poll.rs:120:pub struct PollCondVarBox {\nrust/kernel/sync/poll.rs:121: inner: ManuallyDrop\u003cPin\u003cKBox\u003cPollCondVarBoxInner\u003e\u003e\u003e,\nrust/kernel/sync/poll.rs-122-}\n--\nrust/kernel/sync/poll.rs-125-#[repr(C)]\nrust/kernel/sync/poll.rs:126:struct PollCondVarBoxInner {\nrust/kernel/sync/poll.rs-127- #[pin]\nrust/kernel/sync/poll.rs:128: inner: PollCondVar,\nrust/kernel/sync/poll.rs-129- rcu: Opaque\u003cbindings::kvfree_rcu_head\u003e,\n--\nrust/kernel/sync/poll.rs-131-\nrust/kernel/sync/poll.rs:132:// SAFETY: PollCondVar is Send\nrust/kernel/sync/poll.rs:133:unsafe impl Send for PollCondVarBoxInner {}\nrust/kernel/sync/poll.rs:134:// SAFETY: PollCondVar is Sync\nrust/kernel/sync/poll.rs:135:unsafe impl Sync for PollCondVarBoxInner {}\nrust/kernel/sync/poll.rs-136-\nrust/kernel/sync/poll.rs:137:impl PollCondVarBox {\nrust/kernel/sync/poll.rs:138: /// Constructs a new boxed [`PollCondVar`].\nrust/kernel/sync/poll.rs-139- pub fn new(name: \u0026'static CStr, key: Pin\u003c\u0026'static LockClassKey\u003e) -\u003e Result\u003cSelf, AllocError\u003e {\nrust/kernel/sync/poll.rs-140- let b = KBox::pin_init(\nrust/kernel/sync/poll.rs:141: pin_init!(PollCondVarBoxInner {\nrust/kernel/sync/poll.rs:142: inner \u003c- PollCondVar::new(name, key),\nrust/kernel/sync/poll.rs-143- rcu: Opaque::uninit(),\n--\nrust/kernel/sync/poll.rs-148-\nrust/kernel/sync/poll.rs:149: Ok(PollCondVarBox {\nrust/kernel/sync/poll.rs-150- inner: ManuallyDrop::new(b),\n--\nrust/kernel/sync/poll.rs-154-\nrust/kernel/sync/poll.rs:155:impl Deref for PollCondVarBox {\nrust/kernel/sync/poll.rs:156: type Target = PollCondVar;\nrust/kernel/sync/poll.rs:157: fn deref(\u0026self) -\u003e \u0026PollCondVar {\nrust/kernel/sync/poll.rs-158- \u0026self.inner.inner\n--\nrust/kernel/sync/poll.rs-161-\nrust/kernel/sync/poll.rs:162:impl Drop for PollCondVarBox {\nrust/kernel/sync/poll.rs-163- #[inline]\n"
} |
| 9/2 | 2026/09/28 03:35 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 12160 output: 24 thoughts: 43 Thoughts: Okay, let's dive into this. I need to understand how these kernel components interact. **Investigating Kernel Component Usage** Alright, I want to trace the usage of key kernel components like `gen_disk`, `serdev`, and `condvar`. Where are these abstractions being employed in the wider kernel ecosystem? To do that I will start by using grep, a quick and efficient way to scan for instances of `gen_disk`, or its likely variations like `GenDisk`, within the kernel source. By identifying these instances, I can start to build a map of how these pieces fit together. That's the first step to understanding. |
| 10/2 | 2026/09/28 03:35 | tool | grepper |
0mArgs:{
"Expression": "GenDisk",
"PathPrefix": "rust/"
}Results: {
"Output": "rust/kernel/block/mq.rs-9-//! - Create a [`TagSet\u003cT\u003e`].\nrust/kernel/block/mq.rs:10://! - Create a [`GenDisk\u003cT\u003e`], via the [`GenDiskBuilder`].\nrust/kernel/block/mq.rs:11://! - Add the disk to the system by calling [`GenDiskBuilder::build`] passing in\nrust/kernel/block/mq.rs-12-//! the `TagSet` reference.\n--\nrust/kernel/block/mq.rs-16-//! - The [`TagSet`] type that abstracts the C type `struct tag_set`.\nrust/kernel/block/mq.rs:17://! - The [`GenDisk`] type that abstracts the C type `struct gendisk`.\nrust/kernel/block/mq.rs-18-//! - The [`Request`] type that abstracts the C type `struct request`.\n--\nrust/kernel/block/mq.rs-38-//!\nrust/kernel/block/mq.rs:39://! One `TagSet` instance can be shared between multiple `GenDisk` instances.\nrust/kernel/block/mq.rs-40-//! This can be useful when implementing drivers where one piece of hardware\n--\nrust/kernel/block/mq.rs-50-//!\nrust/kernel/block/mq.rs:51://! [`GenDisk`]: gen_disk::GenDisk\nrust/kernel/block/mq.rs:52://! [`GenDisk\u003cT\u003e`]: gen_disk::GenDisk\nrust/kernel/block/mq.rs:53://! [`GenDiskBuilder`]: gen_disk::GenDiskBuilder\nrust/kernel/block/mq.rs:54://! [`GenDiskBuilder::build`]: gen_disk::GenDiskBuilder::build\nrust/kernel/block/mq.rs-55-//!\n--\nrust/kernel/block/mq.rs-88-//! Arc::pin_init(TagSet::new(1, 256, 1), flags::GFP_KERNEL)?;\nrust/kernel/block/mq.rs:89://! let mut disk = gen_disk::GenDiskBuilder::new()\nrust/kernel/block/mq.rs-90-//! .capacity_sectors(4096)\n--\nrust/kernel/block/mq/gen_disk.rs-20-\nrust/kernel/block/mq/gen_disk.rs:21:/// A builder for [`GenDisk`].\nrust/kernel/block/mq/gen_disk.rs-22-///\nrust/kernel/block/mq/gen_disk.rs:23:/// Use this struct to configure and add new [`GenDisk`] to the VFS.\nrust/kernel/block/mq/gen_disk.rs:24:pub struct GenDiskBuilder {\nrust/kernel/block/mq/gen_disk.rs-25- rotational: bool,\n--\nrust/kernel/block/mq/gen_disk.rs-30-\nrust/kernel/block/mq/gen_disk.rs:31:impl Default for GenDiskBuilder {\nrust/kernel/block/mq/gen_disk.rs-32- fn default() -\u003e Self {\n--\nrust/kernel/block/mq/gen_disk.rs-41-\nrust/kernel/block/mq/gen_disk.rs:42:impl GenDiskBuilder {\nrust/kernel/block/mq/gen_disk.rs-43- /// Create a new instance.\n--\nrust/kernel/block/mq/gen_disk.rs=93= pub fn capacity_sectors(mut self, capacity: u64) -\u003e Self {\n--\nrust/kernel/block/mq/gen_disk.rs-97-\nrust/kernel/block/mq/gen_disk.rs:98: /// Build a new `GenDisk` and add it to the VFS.\nrust/kernel/block/mq/gen_disk.rs-99- pub fn build\u003cT: Operations\u003e(\n--\nrust/kernel/block/mq/gen_disk.rs-103- queue_data: T::QueueData,\nrust/kernel/block/mq/gen_disk.rs:104: ) -\u003e Result\u003cGenDisk\u003cT\u003e\u003e {\nrust/kernel/block/mq/gen_disk.rs-105- let data = queue_data.into_foreign();\n--\nrust/kernel/block/mq/gen_disk.rs-194- // `__blk_mq_alloc_disk` above.\nrust/kernel/block/mq/gen_disk.rs:195: Ok(GenDisk {\nrust/kernel/block/mq/gen_disk.rs-196- _tagset: tagset,\n--\nrust/kernel/block/mq/gen_disk.rs-209-/// - `self.gendisk.queue.queuedata` is initialized by a call to `ForeignOwnable::into_foreign`.\nrust/kernel/block/mq/gen_disk.rs:210:pub struct GenDisk\u003cT: Operations\u003e {\nrust/kernel/block/mq/gen_disk.rs-211- _tagset: Arc\u003cTagSet\u003cT\u003e\u003e,\n--\nrust/kernel/block/mq/gen_disk.rs-214-\nrust/kernel/block/mq/gen_disk.rs:215:// SAFETY: `GenDisk` is an owned pointer to a `struct gendisk` and an `Arc` to a\nrust/kernel/block/mq/gen_disk.rs-216-// `TagSet` It is safe to send this to other threads as long as T is Send.\nrust/kernel/block/mq/gen_disk.rs:217:unsafe impl\u003cT: Operations + Send\u003e Send for GenDisk\u003cT\u003e {}\nrust/kernel/block/mq/gen_disk.rs-218-\nrust/kernel/block/mq/gen_disk.rs:219:impl\u003cT: Operations\u003e Drop for GenDisk\u003cT\u003e {\nrust/kernel/block/mq/gen_disk.rs-220- fn drop(\u0026mut self) {\n--\nrust/kernel/block/mq/gen_disk.rs-236-\nrust/kernel/block/mq/gen_disk.rs:237: // SAFETY: `queue.queuedata` was created by `GenDiskBuilder::build` with\nrust/kernel/block/mq/gen_disk.rs-238- // a call to `ForeignOwnable::into_foreign` to create `queuedata`.\n--\nrust/kernel/block/mq/operations.rs=30=pub trait Operations: Sized {\nrust/kernel/block/mq/operations.rs-31- /// Data associated with the `struct request_queue` that is allocated for\nrust/kernel/block/mq/operations.rs:32: /// the `GenDisk` associated with this `Operations` implementation.\nrust/kernel/block/mq/operations.rs-33- type QueueData: ForeignOwnable;\n--\nrust/kernel/block/mq/operations.rs=68=impl\u003cT: Operations\u003e OperationsVTable\u003cT\u003e {\n--\nrust/kernel/block/mq/operations.rs-106-\nrust/kernel/block/mq/operations.rs:107: // SAFETY: `queue.queuedata` was created by `GenDiskBuilder::build` with\nrust/kernel/block/mq/operations.rs-108- // a call to `ForeignOwnable::into_foreign` to create `queuedata`.\n--\nrust/kernel/block/mq/operations.rs-141-\nrust/kernel/block/mq/operations.rs:142: // SAFETY: `queue.queuedata` was created by `GenDisk::try_new()` with a\nrust/kernel/block/mq/operations.rs-143- // call to `ForeignOwnable::into_foreign()` to create `queuedata`.\n"
} |
| 11/2 | 2026/09/28 03:35 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 14253 output: 17 thoughts: 46 Thoughts: Here's my summary, as if I were thinking it: **Digging into Kernel Disk Generation** Alright, let's get down to brass tacks. I need to understand where the disk generation logic resides within the kernel, specifically focusing on `GenDisk`, `gen_disk`, or possibly even `rnull`. My usual approach is to leverage grep's power. Given the potentially numerous files in a kernel source tree, I'll initiate a comprehensive grep search. I'll include `GenDiskBuilder` to see if there is any factory pattern being employed or if a builder pattern is employed. I need to know where and how the disk objects are constructed and managed throughout the system. I need to understand how the lower layers of storage interact with the device drivers. A comprehensive grep will, in this instance, provide the most information. |
| 12/2 | 2026/09/28 03:35 | tool | grepper |
0mArgs:{
"Expression": "GenDiskBuilder"
}Results: {
"Output": "drivers/block/rnull/configfs.rs-4-use kernel::{\ndrivers/block/rnull/configfs.rs:5: block::mq::gen_disk::{GenDisk, GenDiskBuilder},\ndrivers/block/rnull/configfs.rs-6- configfs::{self, AttributeOperations},\n--\ndrivers/block/rnull/configfs.rs=176= fn store(this: \u0026DeviceConfig, page: \u0026[u8]) -\u003e Result {\n--\ndrivers/block/rnull/configfs.rs-183-\ndrivers/block/rnull/configfs.rs:184: GenDiskBuilder::validate_block_size(value)?;\ndrivers/block/rnull/configfs.rs-185- this.data.lock().block_size = value;\n--\ndrivers/block/rnull/rnull.rs=48= fn new(\n--\ndrivers/block/rnull/rnull.rs-58-\ndrivers/block/rnull/rnull.rs:59: gen_disk::GenDiskBuilder::new()\ndrivers/block/rnull/rnull.rs-60- .capacity_sectors(capacity_mib \u003c\u003c (20 - block::SECTOR_SHIFT))\n--\nrust/kernel/block/mq.rs-9-//! - Create a [`TagSet\u003cT\u003e`].\nrust/kernel/block/mq.rs:10://! - Create a [`GenDisk\u003cT\u003e`], via the [`GenDiskBuilder`].\nrust/kernel/block/mq.rs:11://! - Add the disk to the system by calling [`GenDiskBuilder::build`] passing in\nrust/kernel/block/mq.rs-12-//! the `TagSet` reference.\n--\nrust/kernel/block/mq.rs-52-//! [`GenDisk\u003cT\u003e`]: gen_disk::GenDisk\nrust/kernel/block/mq.rs:53://! [`GenDiskBuilder`]: gen_disk::GenDiskBuilder\nrust/kernel/block/mq.rs:54://! [`GenDiskBuilder::build`]: gen_disk::GenDiskBuilder::build\nrust/kernel/block/mq.rs-55-//!\n--\nrust/kernel/block/mq.rs-88-//! Arc::pin_init(TagSet::new(1, 256, 1), flags::GFP_KERNEL)?;\nrust/kernel/block/mq.rs:89://! let mut disk = gen_disk::GenDiskBuilder::new()\nrust/kernel/block/mq.rs-90-//! .capacity_sectors(4096)\n--\nrust/kernel/block/mq/gen_disk.rs-23-/// Use this struct to configure and add new [`GenDisk`] to the VFS.\nrust/kernel/block/mq/gen_disk.rs:24:pub struct GenDiskBuilder {\nrust/kernel/block/mq/gen_disk.rs-25- rotational: bool,\n--\nrust/kernel/block/mq/gen_disk.rs-30-\nrust/kernel/block/mq/gen_disk.rs:31:impl Default for GenDiskBuilder {\nrust/kernel/block/mq/gen_disk.rs-32- fn default() -\u003e Self {\n--\nrust/kernel/block/mq/gen_disk.rs-41-\nrust/kernel/block/mq/gen_disk.rs:42:impl GenDiskBuilder {\nrust/kernel/block/mq/gen_disk.rs-43- /// Create a new instance.\n--\nrust/kernel/block/mq/gen_disk.rs=220= fn drop(\u0026mut self) {\n--\nrust/kernel/block/mq/gen_disk.rs-236-\nrust/kernel/block/mq/gen_disk.rs:237: // SAFETY: `queue.queuedata` was created by `GenDiskBuilder::build` with\nrust/kernel/block/mq/gen_disk.rs-238- // a call to `ForeignOwnable::into_foreign` to create `queuedata`.\n--\nrust/kernel/block/mq/operations.rs=68=impl\u003cT: Operations\u003e OperationsVTable\u003cT\u003e {\n--\nrust/kernel/block/mq/operations.rs-106-\nrust/kernel/block/mq/operations.rs:107: // SAFETY: `queue.queuedata` was created by `GenDiskBuilder::build` with\nrust/kernel/block/mq/operations.rs-108- // a call to `ForeignOwnable::into_foreign` to create `queuedata`.\n"
} |
| 13/2 | 2026/09/28 03:35 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 15595 output: 18 thoughts: 10 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience, presented in the first person: **Investigating the Role of `serdev`** Alright, let's dive into this. My initial thought process is always methodical, so naturally, my first inclination is: What's the practical utility of `serdev`? I need to understand its core purpose, the types of tasks it's designed to solve, and the specific niches it occupies within the broader ecosystem of serial device management. I’m thinking about its capabilities, the kinds of devices it likely interfaces with, and the protocols it might support. Are we talking about low-level hardware interaction, or does it offer a higher-level abstraction? Does it handle the nuances of different serial standards and error conditions? Is it a general-purpose utility or does it cater to a specific industry? Knowing this is the foundation for any real analysis. I'm essentially building a functional model in my head: "If `serdev`, then...". I need to understand the "then" part. |
| 14/2 | 2026/09/28 03:35 | tool | grepper |
0mError:no matches Args: {
"Expression": "kernel::serdev"
}Results: {
"error": "no matches"
} |
| 15/2 | 2026/09/28 03:35 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 15859 output: 17 thoughts: 15 Thoughts: Here's my thought process, as if I were considering this search: **Diving into the Codebase: The `serdev::` Hunt** Okay, so I need to track down instances of `serdev::`. It's a common prefix, suggesting it's either a library or a module related to serialization/deserialization, probably within Rust or perhaps in some drivers. Given my expertise, I suspect it's likely more complex than a basic utility, perhaps related to embedded systems or hardware interaction given the drivers mention. The scope is important - am I looking at the core Rust libraries, or more project-specific code? I'll probably start broad to get a feel for the landscape, then narrow it down. I'll focus on Rust codebases first, as that is the language mentioned. Now, let's start searching! |
| 16/2 | 2026/09/28 03:35 | tool | grepper |
0mArgs:{
"Expression": "serdev::"
}Results: {
"Output": "rust/kernel/serdev.rs=296=macro_rules! module_serdev_device_driver {\nrust/kernel/serdev.rs-297- ($($f:tt)*) =\u003e {\nrust/kernel/serdev.rs:298: $crate::module_driver!(\u003cT\u003e, $crate::serdev::Adapter\u003cT\u003e, { $($f)* });\nrust/kernel/serdev.rs-299- };\n--\nrust/kernel/serdev.rs-323-/// OF_TABLE,\nrust/kernel/serdev.rs:324:/// \u003cMyDriver as serdev::Driver\u003e::IdInfo,\nrust/kernel/serdev.rs-325-/// [\n--\nrust/kernel/serdev.rs-331-/// ACPI_TABLE,\nrust/kernel/serdev.rs:332:/// \u003cMyDriver as serdev::Driver\u003e::IdInfo,\nrust/kernel/serdev.rs-333-/// [\n--\nrust/kernel/serdev.rs-338-/// #[vtable]\nrust/kernel/serdev.rs:339:/// impl serdev::Driver for MyDriver {\nrust/kernel/serdev.rs-340-/// type IdInfo = ();\n--\nrust/kernel/serdev.rs-345-/// fn probe\u003c'bound\u003e(\nrust/kernel/serdev.rs:346:/// sdev: \u0026'bound serdev::Device\u003cCore\u003c'_\u003e\u003e,\nrust/kernel/serdev.rs-347-/// _id_info: Option\u003c\u0026'bound Self::IdInfo\u003e,\n--\nrust/kernel/serdev.rs=548= pub fn wait_until_sent(\u0026self, timeout: Jiffies) {\n--\nrust/kernel/serdev.rs-558-\nrust/kernel/serdev.rs:559:// SAFETY: `serdev::Device` is a transparent wrapper of `struct serdev_device`.\nrust/kernel/serdev.rs:560:// The offset is guaranteed to point to a valid device field inside `serdev::Device`.\nrust/kernel/serdev.rs-561-unsafe impl\u003cCtx: device::DeviceContext\u003e device::AsBusDevice\u003cCtx\u003e for Device\u003cCtx\u003e {\n--\nsamples/rust/rust_driver_serdev.rs=17=struct SampleDriver {\nsamples/rust/rust_driver_serdev.rs:18: sdev: ARef\u003cserdev::Device\u003e,\nsamples/rust/rust_driver_serdev.rs-19-}\n--\nsamples/rust/rust_driver_serdev.rs-22- OF_TABLE,\nsamples/rust/rust_driver_serdev.rs:23: \u003cSampleDriver as serdev::Driver\u003e::IdInfo,\nsamples/rust/rust_driver_serdev.rs-24- [(of::DeviceId::new(c\"test,rust_driver_serdev\"), ())]\n--\nsamples/rust/rust_driver_serdev.rs-28- ACPI_TABLE,\nsamples/rust/rust_driver_serdev.rs:29: \u003cSampleDriver as serdev::Driver\u003e::IdInfo,\nsamples/rust/rust_driver_serdev.rs-30- [(acpi::DeviceId::new(c\"LNUXBEEF\"), ())]\n--\nsamples/rust/rust_driver_serdev.rs-33-#[vtable]\nsamples/rust/rust_driver_serdev.rs:34:impl serdev::Driver for SampleDriver {\nsamples/rust/rust_driver_serdev.rs-35- type IdInfo = ();\n--\nsamples/rust/rust_driver_serdev.rs=40= fn probe\u003c'bound\u003e(\nsamples/rust/rust_driver_serdev.rs:41: sdev: \u0026'bound serdev::Device\u003cCore\u003c'_\u003e\u003e,\nsamples/rust/rust_driver_serdev.rs-42- _info: Option\u003c\u0026'bound Self::IdInfo\u003e,\n--\nsamples/rust/rust_driver_serdev.rs-58- sdev.set_flow_control(false);\nsamples/rust/rust_driver_serdev.rs:59: sdev.set_parity(serdev::Parity::None)?;\nsamples/rust/rust_driver_serdev.rs-60-\n--\nsamples/rust/rust_driver_serdev.rs=64= fn receive\u003c'bound\u003e(\nsamples/rust/rust_driver_serdev.rs:65: sdev: \u0026'bound serdev::Device\u003cBound\u003e,\nsamples/rust/rust_driver_serdev.rs-66- _this: Pin\u003c\u0026Self\u003e,\n"
} |
| 17/2 | 2026/09/28 03:35 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 17194 output: 26 thoughts: 56 Thoughts: Okay, let's dive into this. **Investigating the Rust Null Block Driver** Alright, so I'm looking at `drivers/block/rnull/` – ah, that's the Rust implementation of the null block driver. Interesting. Now, a key question immediately springs to mind: is this thing actually *reachable* in the current configuration? Meaning, can the system make use of it? To figure this out, I need to check the Kconfig files. Specifically, I'll start with `drivers/block/rnull/Kconfig`, and then of course I'll need to check the higher-level Kconfig file: `drivers/block/Kconfig`. These will contain the dependencies and configuration options that determine whether `rnull` gets compiled and linked into the image. From there I can determine if this feature is enabled or disabled. |
| 18/2 | 2026/09/28 03:35 | tool | grepper |
0mArgs:{
"Expression": "rnull",
"PathPrefix": "drivers/block/"
}Results: {
"Output": "drivers/block/Kconfig=19=source \"drivers/block/null_blk/Kconfig\"\ndrivers/block/Kconfig:20:source \"drivers/block/rnull/Kconfig\"\ndrivers/block/Kconfig-21-\n--\ndrivers/block/Makefile=37=obj-$(CONFIG_BLK_DEV_NULL_BLK)\t+= null_blk/\ndrivers/block/Makefile:38:obj-$(CONFIG_BLK_DEV_RUST_NULL) += rnull/\ndrivers/block/Makefile-39-\n--\ndrivers/block/rnull/Makefile-1-\ndrivers/block/rnull/Makefile:2:obj-$(CONFIG_BLK_DEV_RUST_NULL) += rnull_mod.o\ndrivers/block/rnull/Makefile:3:rnull_mod-y := rnull.o\n--\ndrivers/block/rnull/configfs.rs=16=pub(crate) fn subsystem() -\u003e impl PinInit\u003ckernel::configfs::Subsystem\u003cConfig\u003e, Error\u003e {\n--\ndrivers/block/rnull/configfs.rs-25-\ndrivers/block/rnull/configfs.rs:26: kernel::configfs::Subsystem::new(c\"rnull\", item_type, try_pin_init!(Config {}))\ndrivers/block/rnull/configfs.rs-27-}\n--\ndrivers/block/rnull/rnull.rs-22- type: NullBlkModule,\ndrivers/block/rnull/rnull.rs:23: name: \"rnull_mod\",\ndrivers/block/rnull/rnull.rs-24- authors: [\"Andreas Hindborg\"],\n"
} |
| 19/2 | 2026/09/28 03:35 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 17864 output: 35 thoughts: 15 Thoughts: Here's my take on those thoughts, tailored for an expert audience: **Diving into the rnull Kconfig** Right, let's get down to brass tacks. I need to take a look at the `drivers/block/rnull/Kconfig` file. Specifically, I'm thinking about the implications for my current work, whatever that might be. This is where the core configuration options for the "null block driver" will be defined. I'm immediately running through the usual checklist: what dependencies are defined here? Are there any unexpected interactions with other block layer components, or with other drivers? Is there anything particularly novel or relevant to the low-level I/O performance characteristics of the simulated device? I should quickly scan for any default settings that might be overridden in higher-level configurations and make a note. Time to get to the code. |
| 20/2 | 2026/09/28 03:35 | tool | read-file |
0mArgs:{
"File": "drivers/block/rnull/Kconfig",
"FirstLine": 1,
"LineCount": 50
}Results: {
"Contents": " 1:\t# SPDX-License-Identifier: GPL-2.0\n 2:\t#\n 3:\t# Rust null block device driver configuration\n 4:\t\n 5:\tconfig BLK_DEV_RUST_NULL\n 6:\t\ttristate \"Rust null block driver (Experimental)\"\n 7:\t\tdepends on RUST \u0026\u0026 CONFIGFS_FS\n 8:\t\thelp\n 9:\t\t This is the Rust implementation of the null block driver. Like\n 10:\t\t the C version, the driver allows the user to create virutal block\n 11:\t\t devices that can be configured via various configuration options.\n 12:\t\n 13:\t\t If unsure, say N.\n"
} |
| 21/2 | 2026/09/28 03:35 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 18274 output: 32 thoughts: 82 Thoughts: Here's my understanding, as if I were thinking it: **Decoding the Rust Null Block Driver Setup** Okay, so I'm looking into how this Rust null block driver, which lives in `drivers/block/rnull/`, is initialized. It's using `GenDiskBuilder::build`, which is a key indicator. I need to trace the initialization to find out how it's being set up by the system. Now, let's think: what triggers the creation of this device? Ah, right, it's configfs! When someone configures a device using `BLK_DEV_RUST_NULL`, that's the starting point. I should probably focus on `drivers/block/rnull/configfs.rs`. I'm guessing the meat of the device creation process probably happens somewhere in the region of lines 100 to 200 of that file. That's where I need to dig to figure out how the `GenDiskBuilder` is being fed and how the driver gets integrated. I bet that's where I'll find the device initialization details. |
| 22/2 | 2026/09/28 03:36 | tool | grepper |
0mArgs:{
"Expression": "GenDiskBuilder::new",
"PathPrefix": "drivers/block/rnull/"
}Results: {
"Output": "drivers/block/rnull/rnull.rs=48= fn new(\n--\ndrivers/block/rnull/rnull.rs-58-\ndrivers/block/rnull/rnull.rs:59: gen_disk::GenDiskBuilder::new()\ndrivers/block/rnull/rnull.rs-60- .capacity_sectors(capacity_mib \u003c\u003c (20 - block::SECTOR_SHIFT))\n"
} |
| 23/2 | 2026/09/28 03:36 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 18737 output: 38 thoughts: 23 Thoughts: Here's a summary of my thought process, as requested: **Diving into the rnull.rs Driver** Alright, let's get down to brass tacks. I'm taking a look at the `drivers/block/rnull/rnull.rs` file. Specifically, I'm honing in on the code around line 48. I'm assuming that this is where the action is for some key functionality, potentially the initialization of a device, a crucial data structure declaration, or maybe even an important interrupt handler setup. My years of experience tell me that line 48 is probably a good starting point to understand the core mechanics of this `rnull` block driver. I'm expecting some clues to its design philosophy and how it handles read/write requests. I'm mentally preparing to parse the code, look for relevant comments, and see what it's up to. Let's see what we can find! |
| 24/2 | 2026/09/28 03:36 | tool | read-file |
0mArgs:{
"File": "drivers/block/rnull/rnull.rs",
"FirstLine": 40,
"LineCount": 50
}Results: {
"Contents": " 40:\t configfs_subsystem \u003c- configfs::subsystem(),\n 41:\t })\n 42:\t }\n 43:\t}\n 44:\t\n 45:\tstruct NullBlkDevice;\n 46:\t\n 47:\timpl NullBlkDevice {\n 48:\t fn new(\n 49:\t name: \u0026CStr,\n 50:\t block_size: u32,\n 51:\t rotational: bool,\n 52:\t capacity_mib: u64,\n 53:\t irq_mode: IRQMode,\n 54:\t ) -\u003e Result\u003cGenDisk\u003cSelf\u003e\u003e {\n 55:\t let tagset = Arc::pin_init(TagSet::new(1, 256, 1), GFP_KERNEL)?;\n 56:\t\n 57:\t let queue_data = Box::new(QueueData { irq_mode }, GFP_KERNEL)?;\n 58:\t\n 59:\t gen_disk::GenDiskBuilder::new()\n 60:\t .capacity_sectors(capacity_mib \u003c\u003c (20 - block::SECTOR_SHIFT))\n 61:\t .logical_block_size(block_size)?\n 62:\t .physical_block_size(block_size)?\n 63:\t .rotational(rotational)\n 64:\t .build(fmt!(\"{}\", name.to_str()?), tagset, queue_data)\n 65:\t }\n 66:\t}\n 67:\t\n 68:\tstruct QueueData {\n 69:\t irq_mode: IRQMode,\n 70:\t}\n 71:\t\n 72:\t#[vtable]\n 73:\timpl Operations for NullBlkDevice {\n 74:\t type QueueData = KBox\u003cQueueData\u003e;\n 75:\t\n 76:\t #[inline(always)]\n 77:\t fn queue_rq(queue_data: \u0026QueueData, rq: ARef\u003cmq::Request\u003cSelf\u003e\u003e, _is_last: bool) -\u003e Result {\n 78:\t match queue_data.irq_mode {\n 79:\t IRQMode::None =\u003e mq::Request::end_ok(rq)\n 80:\t .map_err(|_e| kernel::error::code::EIO)\n 81:\t // We take no refcounts on the request, so we expect to be able to\n 82:\t // end the request. The request reference must be unique at this\n 83:\t // point, and so `end_ok` cannot fail.\n 84:\t .expect(\"Fatal error - expected to be able to end request\"),\n 85:\t IRQMode::Soft =\u003e mq::Request::complete(rq),\n 86:\t }\n 87:\t Ok(())\n 88:\t }\n 89:\t\n"
} |
| 25/2 | 2026/09/28 03:36 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 19741 output: 18 thoughts: 967 Thoughts: **Analyzing the Patch: Replacing ScopeGuard with DropGuard** Okay, so `NullBlkDevice::new` is directly tied to the configfs interface; userspace creates these devices through configfs writes or `mkdirs`. Got it. Now, this patch... looks like it's a refactoring, specifically related to how we manage resource cleanup. It's replacing a lot of `ScopeGuard` instances with a new struct called `DropGuard`. Let's dive deeper. The patch introduces `DropGuard` in `mem.rs`. It's essentially a wrapper around `ManuallyDrop<T>` and `ManuallyDrop<F>`, where `F` is a closure that performs cleanup. It implements `Drop`, of course, along with `Deref` and `DerefMut` for convenience, and a `dismiss` method. The key thing here is the motivation. They're replacing `ScopeGuard` which wraps `Option<(T, F)>`. That `Option` has overhead because of the discriminant tag. `DropGuard` avoids this overhead by using `ManuallyDrop`. It's about zero-cost abstractions, as expected. I see this pattern across several files, `gen_disk.rs`, `serdev.rs`, and even within our locking primitives in `lock.rs`. In each case, a `ScopeGuard` responsible for ensuring some kind of cleanup when a resource goes out of scope is being swapped out. The closures within `DropGuard` perform the necessary `drop()` calls to release the resources. They are using `into_foreign()`, `from_foreign()`, `put_disk`, `drvdata_obtain()`, `unlock()`, etc, which require proper handling. The interesting thing is that we aren't losing functionality here, just improving efficiency. I want to check the git commit log for the context of this change to see the reasoning. |
| 26/2 | 2026/09/28 03:36 | tool | grepper |
0mError:no matches Args: {
"Expression": "syz-cluster"
}Results: {
"error": "no matches"
} |
| 27/2 | 2026/09/28 03:36 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 21138 output: 19 thoughts: 607 Thoughts: **Analyzing DropGuard Usage in the Kernel** Okay, let's break this down. First, I need to figure out how this `DropGuard` is being used, especially since I can't immediately get the full context from `git log -1`. The commit message gives me a starting point, "syz-cluster: applied patch under review," so it's likely related to fuzzing or testing. Now, I'm checking the `DropGuard` implementation itself in `rust/kernel/mem.rs`. Standard `Drop` implementation with the `ManuallyDrop` to prevent double-frees. The `dismiss` function is the interesting part, it prevents the destructor from running by `ManuallyDrop::drop`. This screams potential resource management, but I need to see where it's *actually* used. I recall that `ScopeGuard` was possibly being phased out, so I'm also confirming `ScopeGuard` is still in `types.rs`. Now, the crucial part: where are `DropGuard` instances created? I'm finding two key uses: 1. `rust/kernel/block/mq/gen_disk.rs`: `GenDiskBuilder::build` uses `DropGuard`. This is significant because `GenDiskBuilder::build` is called within the `rnull` block driver. This *strongly* suggests `DropGuard` is involved in resource cleanup during block device creation, likely related to device initialization or cleanup on exit. 2. `rust/kernel/sync/lock.rs`: `Guard::do_unlocked` uses `DropGuard`. And `Guard::do_unlocked` is called by `CondVar::wait_internal` in `rust/kernel/sync/condvar.rs`. This tells me that it is involved in a synchronization primitive and could be used for unlocking some data. The synchronization piece is particularly important. Now, I need to see how deeply nested this is and whether `CondVar::wait_internal` is a critical path. I'll need to grep for `.wait(` or `wait_interruptible` within `rust/` and `drivers/` to get a complete picture of its reach and frequency of use. I'm now curious about where is this code used, and if I can reach it with a simple test. |
| 28/2 | 2026/09/28 03:36 | tool | grepper |
0mArgs:{
"Expression": "\\.wait_interruptible"
}Results: {
"Output": "drivers/android/binder/process.rs=1541= pub(crate) fn ioctl_freeze(\u0026self, info: \u0026BinderFreezeInfo) -\u003e Result {\n--\ndrivers/android/binder/process.rs-1566- .freeze_wait\ndrivers/android/binder/process.rs:1567: .wait_interruptible_timeout(\u0026mut inner, jiffies)\ndrivers/android/binder/process.rs-1568- {\n--\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-565- inner.looper_flags |= LooperFlag::Waiting;\ndrivers/android/binder/thread.rs:566: let signal_pending = self.work_condvar.wait_interruptible_freezable(\u0026mut inner);\ndrivers/android/binder/thread.rs-567- inner.looper_flags \u0026= !LooperFlag::Waiting;\n--\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/thread.rs-639- inner.looper_flags |= LooperFlag::Waiting | LooperFlag::WaitingProc;\ndrivers/android/binder/thread.rs:640: let signal_pending = self.work_condvar.wait_interruptible_freezable(\u0026mut inner);\ndrivers/android/binder/thread.rs-641- inner.looper_flags \u0026= !(LooperFlag::Waiting | LooperFlag::WaitingProc);\n"
} |
| 29/2 | 2026/09/28 03:36 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 22696 output: 38 thoughts: 94 Thoughts: Okay, here's my take on those snippets, as if I were processing them myself: **Binder Rust Code Investigation** Well, would you look at this! I see `drivers/android/binder/` – and it's in Rust! That's interesting, *Rust binder*, now we're talking. Let's dig in a bit further to see what's going on. First up, let's have a peek at `drivers/android/binder/thread.rs`. Ah, here it is: `self.work_condvar.wait_interruptible_freezable(&mut inner)`. Now, that's familiar but that method name is quite specific, what does this actually *do*? Okay, time to check out `rust/kernel/sync/condvar.rs`. Let's see how `wait_interruptible_freezable` is implemented and what kind of synchronization it's using. I want to understand the exact mechanics of this wait operation, especially given the "interruptible" and "freezable" aspects, and how that fits into the binder context. The devil is always in the details with this kind of concurrency, especially in a kernel environment. Let's see if this `condvar.rs` file offers a clear picture! |
| 30/2 | 2026/09/28 03:36 | tool | read-file |
0mArgs:{
"File": "rust/kernel/sync/condvar.rs",
"FirstLine": 165,
"LineCount": 25
}Results: {
"Contents": " 165:\t /// can trivially deadlock vs another task that needs that lock to complete before it too can\n 166:\t /// hit freezable.\n 167:\t #[must_use = \"wait_interruptible_freezable returns if a signal is pending, so the caller must check the return value\"]\n 168:\t pub fn wait_interruptible_freezable\u003cT: ?Sized, B: Backend\u003e(\n 169:\t \u0026self,\n 170:\t guard: \u0026mut Guard\u003c'_, T, B\u003e,\n 171:\t ) -\u003e bool {\n 172:\t self.wait_internal(\n 173:\t TASK_INTERRUPTIBLE | TASK_FREEZABLE,\n 174:\t guard,\n 175:\t MAX_SCHEDULE_TIMEOUT,\n 176:\t );\n 177:\t crate::current!().signal_pending()\n 178:\t }\n 179:\t\n 180:\t /// Releases the lock and waits for a notification in interruptible mode.\n 181:\t ///\n 182:\t /// Atomically releases the given lock (whose ownership is proven by the guard) and puts the\n 183:\t /// thread to sleep. It wakes up when notified by [`CondVar::notify_one`] or\n 184:\t /// [`CondVar::notify_all`], or when a timeout occurs, or when the thread receives a signal.\n 185:\t #[must_use = \"wait_interruptible_timeout returns if a signal is pending, so the caller must check the return value\"]\n 186:\t pub fn wait_interruptible_timeout\u003cT: ?Sized, B: Backend\u003e(\n 187:\t \u0026self,\n 188:\t guard: \u0026mut Guard\u003c'_, T, B\u003e,\n 189:\t jiffies: Jiffies,\n"
} |
| 31/2 | 2026/09/28 03:36 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 23591 output: 38 thoughts: 44 Thoughts: Here's my summary, as though I'm thinking through this process: **Diving into `wait_interruptible_freezable` and `wait_internal`** Okay, so I see that `wait_interruptible_freezable` eventually hands off the work to `self.wait_internal(...)`. Right, makes sense. Let's dig into that `wait_internal` method in `rust/kernel/sync/condvar.rs`. I want to understand exactly how this low-level wait mechanism is implemented in this context. I'm really looking for the critical details around the synchronization primitives and how it handles interrupts and freezing, given the name of the top level method. I bet there's some interesting stuff around how the underlying locking is handled as well. |
| 32/2 | 2026/09/28 03:36 | tool | read-file |
0mArgs:{
"File": "rust/kernel/sync/condvar.rs",
"FirstLine": 110,
"LineCount": 35
}Results: {
"Contents": " 110:\t }),\n 111:\t })\n 112:\t }\n 113:\t\n 114:\t fn wait_internal\u003cT: ?Sized, B: Backend\u003e(\n 115:\t \u0026self,\n 116:\t wait_state: c_int,\n 117:\t guard: \u0026mut Guard\u003c'_, T, B\u003e,\n 118:\t timeout_in_jiffies: c_long,\n 119:\t ) -\u003e c_long {\n 120:\t let wait = Opaque::\u003cbindings::wait_queue_entry\u003e::uninit();\n 121:\t\n 122:\t // SAFETY: `wait` points to valid memory.\n 123:\t unsafe { bindings::init_wait(wait.get()) };\n 124:\t\n 125:\t // SAFETY: Both `wait` and `wait_queue_head` point to valid memory.\n 126:\t unsafe {\n 127:\t bindings::prepare_to_wait_exclusive(self.wait_queue_head.get(), wait.get(), wait_state)\n 128:\t };\n 129:\t\n 130:\t // SAFETY: Switches to another thread. The timeout can be any number.\n 131:\t let ret = guard.do_unlocked(|| unsafe { bindings::schedule_timeout(timeout_in_jiffies) });\n 132:\t\n 133:\t // SAFETY: Both `wait` and `wait_queue_head` point to valid memory.\n 134:\t unsafe { bindings::finish_wait(self.wait_queue_head.get(), wait.get()) };\n 135:\t\n 136:\t ret\n 137:\t }\n 138:\t\n 139:\t /// Releases the lock and waits for a notification in uninterruptible mode.\n 140:\t ///\n 141:\t /// Atomically releases the given lock (whose ownership is proven by the guard) and puts the\n 142:\t /// thread to sleep, reacquiring the lock on wake up. It wakes up when notified by\n 143:\t /// [`CondVar::notify_one`] or [`CondVar::notify_all`]. Note that it may also wake up\n 144:\t /// spuriously.\n"
} |
| 33/2 | 2026/09/28 03:36 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 24447 output: 37 thoughts: 26 Thoughts: Okay, here's my summary, tailored for an expert audience, presented as if it were my own thought process: **Diving into the Synchronization Logic** Alright, so I'm digging into this `guard.do_unlocked` function, and it's time to get down to the nitty-gritty. My gut tells me that the core of this behavior likely resides in the locking mechanism itself. Therefore, I need to understand how the synchronization is handled at its lowest level. I'm going to consult `rust/kernel/sync/lock.rs` right away. I need to refresh my memory on the atomics and data structures in use; the specific lock implementation employed here is critical. I'm looking for thread safety guarantees, potential contention points, and any optimization strategies that are in play. I'll need to pay close attention to the lock's state transitions to fully understand how these unlock operations are affecting things. |
| 34/2 | 2026/09/28 03:36 | tool | read-file |
0mArgs:{
"File": "rust/kernel/sync/lock.rs",
"FirstLine": 240,
"LineCount": 25
}Results: {
"Contents": " 240:\t }\n 241:\t\n 242:\t pub(crate) fn do_unlocked\u003cU\u003e(\u0026mut self, cb: impl FnOnce() -\u003e U) -\u003e U {\n 243:\t // SAFETY: The caller owns the lock, so it is safe to unlock it.\n 244:\t unsafe { B::unlock(self.lock.state.get(), \u0026self.state) };\n 245:\t\n 246:\t let _relock = DropGuard::new((), |_|\n 247:\t // SAFETY: The lock was just unlocked above and is being relocked now.\n 248:\t unsafe { B::relock(self.lock.state.get(), \u0026mut self.state) });\n 249:\t\n 250:\t cb()\n 251:\t }\n 252:\t\n 253:\t /// Returns a pinned mutable reference to the protected data.\n 254:\t ///\n 255:\t /// The guard implements [`DerefMut`] when `T: Unpin`, so for [`Unpin`]\n 256:\t /// types [`DerefMut`] should be used instead of this function.\n 257:\t ///\n 258:\t /// [`DerefMut`]: core::ops::DerefMut\n 259:\t /// [`Unpin`]: core::marker::Unpin\n 260:\t ///\n 261:\t /// # Examples\n 262:\t ///\n 263:\t /// ```\n 264:\t /// # use kernel::sync::{Mutex, MutexGuard};\n"
} |
| 35/2 | 2026/09/28 03:36 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 25131 output: 26 thoughts: 274 Thoughts: **My Observations on the `do_unlocked` Function and Binder Relocking**
Okay, take a look at this. It's becoming clearer how this relocking mechanism works in `do_unlocked`. Specifically when `do_unlocked` is executed. The key here is the `DropGuard`. The code shows the following structure:
```rust
let _relock = DropGuard::new((), |_|
// SAFETY: The lock was just unlocked above and is being relocked now.
unsafe { B::relock(self.lock.state.get(), &mut self.state) });
cb()
```
When `cb()` completes, the `_relock` variable goes out of scope and the `DropGuard`'s `drop()` method is called. This is the crux of the logic:
```rust
fn drop(&mut self) {
// SAFETY: `DropGuard` is in the process of being dropped.
let inner = unsafe { ManuallyDrop::take(&mut self.inner) };
// SAFETY: `DropGuard` is in the process of being dropped.
let f = unsafe { ManuallyDrop::take(&mut self.f) };
f(inner);
}
```
The `drop()` implementation takes the contained closure – which is that `unsafe { B::relock(self.lock.state.get(), &mut self.state) }` call – and executes it. This is how the binder is effectively re-locked after `cb()` completes. This is a common pattern, and a very clever way to ensure the lock is re-acquired at the end of the `do_unlocked` block, even if `cb()` panics or has an abnormal exit.
Now, my mind is racing: what is this Rust binder? I see it in `B::relock()`. Is this Rust binder upstream, or is it a custom abstraction? Let's quickly verify in the Kconfig files. I'll search `drivers/android/binder/Kconfig` and `drivers/android/Kconfig` to figure out its origin.
|
| 36/2 | 2026/09/28 03:36 | tool | grepper |
0mArgs:{
"Expression": "BINDER",
"PathPrefix": "drivers/android/"
}Results: {
"Output": "\nFull output is too long, showing 500 out of 599 lines.\nUse more precise expression if possible.\n\ndrivers/android/Kconfig=2=menu \"Android\"\ndrivers/android/Kconfig-3-\ndrivers/android/Kconfig:4:config ANDROID_BINDER_IPC_RUST\ndrivers/android/Kconfig-5-\tbool \"Android Binder IPC Driver\"\n--\ndrivers/android/Kconfig-17-\ndrivers/android/Kconfig:18:config ANDROID_BINDER_DEVICES\ndrivers/android/Kconfig-19-\tstring \"Android Binder devices\"\ndrivers/android/Kconfig:20:\tdepends on ANDROID_BINDER_IPC_RUST\ndrivers/android/Kconfig-21-\tdefault \"binder,hwbinder,vndbinder\"\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-$(CONFIG_ANDROID_BINDER_IPC_RUST)\t+= binder/\n--\ndrivers/android/binder/Makefile=2=ccflags-y += -I$(src)\t# needed for trace events\ndrivers/android/binder/Makefile-3-\ndrivers/android/binder/Makefile:4:obj-$(CONFIG_ANDROID_BINDER_IPC_RUST) += binder.o\ndrivers/android/binder/Makefile-5-binder-y := \\\n--\ndrivers/android/binder/allocation.rs=368= pub(crate) fn transfer_binder_object(\n--\ndrivers/android/binder/allocation.rs-381- newobj.hdr.type_ = if strong {\ndrivers/android/binder/allocation.rs:382: BINDER_TYPE_BINDER\ndrivers/android/binder/allocation.rs-383- } else {\ndrivers/android/binder/allocation.rs:384: BINDER_TYPE_WEAK_BINDER\ndrivers/android/binder/allocation.rs-385- };\n--\ndrivers/android/binder/allocation.rs-401- newobj.hdr.type_ = if strong {\ndrivers/android/binder/allocation.rs:402: BINDER_TYPE_HANDLE\ndrivers/android/binder/allocation.rs-403- } else {\ndrivers/android/binder/allocation.rs:404: BINDER_TYPE_WEAK_HANDLE\ndrivers/android/binder/allocation.rs-405- };\n--\ndrivers/android/binder/allocation.rs=422= fn cleanup_object(\u0026self, index_offset: usize) -\u003e Result {\n--\ndrivers/android/binder/allocation.rs-426- match header.type_ {\ndrivers/android/binder/allocation.rs:427: BINDER_TYPE_WEAK_BINDER | BINDER_TYPE_BINDER =\u003e {\ndrivers/android/binder/allocation.rs-428- let obj = self.read::\u003cFlatBinderObject\u003e(offset)?;\ndrivers/android/binder/allocation.rs:429: let strong = header.type_ == BINDER_TYPE_BINDER;\ndrivers/android/binder/allocation.rs:430: // SAFETY: The type is `BINDER_TYPE_{WEAK_}BINDER`, so the `binder` field is\ndrivers/android/binder/allocation.rs-431- // populated.\n--\ndrivers/android/binder/allocation.rs-436- }\ndrivers/android/binder/allocation.rs:437: BINDER_TYPE_WEAK_HANDLE | BINDER_TYPE_HANDLE =\u003e {\ndrivers/android/binder/allocation.rs-438- let obj = self.read::\u003cFlatBinderObject\u003e(offset)?;\ndrivers/android/binder/allocation.rs:439: let strong = header.type_ == BINDER_TYPE_HANDLE;\ndrivers/android/binder/allocation.rs:440: // SAFETY: The type is `BINDER_TYPE_{WEAK_}HANDLE`, so the `handle` field is\ndrivers/android/binder/allocation.rs-441- // populated.\n--\ndrivers/android/binder/allocation.rs=528= pub(crate) fn as_ref(\u0026mut self) -\u003e BinderObjectRef\u003c'_\u003e {\n--\ndrivers/android/binder/allocation.rs-533- match self.hdr.type_ {\ndrivers/android/binder/allocation.rs:534: BINDER_TYPE_WEAK_BINDER | BINDER_TYPE_BINDER =\u003e Binder(\u0026mut self.fbo),\ndrivers/android/binder/allocation.rs:535: BINDER_TYPE_WEAK_HANDLE | BINDER_TYPE_HANDLE =\u003e Handle(\u0026mut self.fbo),\ndrivers/android/binder/allocation.rs:536: BINDER_TYPE_FD =\u003e Fd(\u0026mut self.fdo),\ndrivers/android/binder/allocation.rs:537: BINDER_TYPE_PTR =\u003e Ptr(\u0026mut self.bbo),\ndrivers/android/binder/allocation.rs:538: BINDER_TYPE_FDA =\u003e Fda(\u0026mut self.fdao),\ndrivers/android/binder/allocation.rs-539- // SAFETY: By the type invariant, the value of `self.hdr.type_` cannot have any\n--\ndrivers/android/binder/allocation.rs=554= fn type_to_size(type_: u32) -\u003e Option\u003cusize\u003e {\ndrivers/android/binder/allocation.rs-555- match type_ {\ndrivers/android/binder/allocation.rs:556: BINDER_TYPE_WEAK_BINDER =\u003e Some(size_of::\u003cuapi::flat_binder_object\u003e()),\ndrivers/android/binder/allocation.rs:557: BINDER_TYPE_BINDER =\u003e Some(size_of::\u003cuapi::flat_binder_object\u003e()),\ndrivers/android/binder/allocation.rs:558: BINDER_TYPE_WEAK_HANDLE =\u003e Some(size_of::\u003cuapi::flat_binder_object\u003e()),\ndrivers/android/binder/allocation.rs:559: BINDER_TYPE_HANDLE =\u003e Some(size_of::\u003cuapi::flat_binder_object\u003e()),\ndrivers/android/binder/allocation.rs:560: BINDER_TYPE_FD =\u003e Some(size_of::\u003cuapi::binder_fd_object\u003e()),\ndrivers/android/binder/allocation.rs:561: BINDER_TYPE_PTR =\u003e Some(size_of::\u003cuapi::binder_buffer_object\u003e()),\ndrivers/android/binder/allocation.rs:562: BINDER_TYPE_FDA =\u003e Some(size_of::\u003cuapi::binder_fd_array_object\u003e()),\ndrivers/android/binder/allocation.rs-563- _ =\u003e None,\n--\ndrivers/android/binder/context.rs=110= pub(crate) fn set_manager_node(\u0026self, node_ref: NodeRef) -\u003e Result {\n--\ndrivers/android/binder/context.rs-112- if manager.node.is_some() {\ndrivers/android/binder/context.rs:113: pr_warn!(\"BINDER_SET_CONTEXT_MGR already set\");\ndrivers/android/binder/context.rs-114- return Err(EBUSY);\n--\ndrivers/android/binder/defs.rs=14=macro_rules! pub_no_prefix {\n--\ndrivers/android/binder/defs.rs-38- BR_DECREFS,\ndrivers/android/binder/defs.rs:39: BR_DEAD_BINDER,\ndrivers/android/binder/defs.rs-40- BR_CLEAR_DEATH_NOTIFICATION_DONE,\ndrivers/android/binder/defs.rs:41: BR_FROZEN_BINDER,\ndrivers/android/binder/defs.rs-42- BR_CLEAR_FREEZE_NOTIFICATION_DONE,\n--\ndrivers/android/binder/defs.rs-62- BC_CLEAR_DEATH_NOTIFICATION,\ndrivers/android/binder/defs.rs:63: BC_DEAD_BINDER_DONE,\ndrivers/android/binder/defs.rs-64- BC_REQUEST_FREEZE_NOTIFICATION,\n--\ndrivers/android/binder/defs.rs-70- flat_binder_object_flags_,\ndrivers/android/binder/defs.rs:71: FLAT_BINDER_FLAG_ACCEPTS_FDS,\ndrivers/android/binder/defs.rs:72: FLAT_BINDER_FLAG_TXN_SECURITY_CTX\ndrivers/android/binder/defs.rs-73-);\n--\ndrivers/android/binder/defs.rs-84-pub(crate) use uapi::{\ndrivers/android/binder/defs.rs:85: BINDER_TYPE_BINDER, BINDER_TYPE_FD, BINDER_TYPE_FDA, BINDER_TYPE_HANDLE, BINDER_TYPE_PTR,\ndrivers/android/binder/defs.rs:86: BINDER_TYPE_WEAK_BINDER, BINDER_TYPE_WEAK_HANDLE,\ndrivers/android/binder/defs.rs-87-};\n--\ndrivers/android/binder/defs.rs=150= pub(crate) fn current() -\u003e Self {\ndrivers/android/binder/defs.rs-151- Self(MaybeUninit::new(uapi::binder_version {\ndrivers/android/binder/defs.rs:152: protocol_version: BINDER_CURRENT_PROTOCOL_VERSION as i32,\ndrivers/android/binder/defs.rs-153- }))\n--\ndrivers/android/binder/error.rs-11-\ndrivers/android/binder/error.rs:12:/// An error that will be returned to userspace via the `BINDER_WRITE_READ` ioctl rather than via\ndrivers/android/binder/error.rs-13-/// errno.\n--\ndrivers/android/binder/freeze.rs=25=pub(crate) struct FreezeListener {\n--\ndrivers/android/binder/freeze.rs-31- last_is_frozen: Option\u003cbool\u003e,\ndrivers/android/binder/freeze.rs:32: /// We sent a `BR_FROZEN_BINDER` and we are waiting for `BC_FREEZE_NOTIFICATION_DONE` before\ndrivers/android/binder/freeze.rs-33- /// sending any other commands.\n--\ndrivers/android/binder/freeze.rs=86= fn do_work(\n--\ndrivers/android/binder/freeze.rs-136-\ndrivers/android/binder/freeze.rs:137: writer.write_code(BR_FROZEN_BINDER)?;\ndrivers/android/binder/freeze.rs-138- writer.write_payload(\u0026state_info)?;\ndrivers/android/binder/freeze.rs:139: // BR_FROZEN_BINDER notifications can cause transactions\ndrivers/android/binder/freeze.rs-140- Ok(false)\n--\ndrivers/android/binder/netlink.rs-14-\ndrivers/android/binder/netlink.rs:15:pub static BINDER_NL_FAMILY: Family = Family::const_new(\ndrivers/android/binder/netlink.rs-16- kernel::module::this_module::\u003ccrate::LocalModule\u003e(),\ndrivers/android/binder/netlink.rs:17: kernel::uapi::BINDER_FAMILY_NAME,\ndrivers/android/binder/netlink.rs:18: kernel::uapi::BINDER_FAMILY_VERSION,\ndrivers/android/binder/netlink.rs:19: \u0026BINDER_NL_FAMILY_MCGRPS,\ndrivers/android/binder/netlink.rs-20-);\ndrivers/android/binder/netlink.rs-21-\ndrivers/android/binder/netlink.rs:22:static BINDER_NL_FAMILY_MCGRPS: [MulticastGroup; 1] = [MulticastGroup::const_new(c\"report\")];\ndrivers/android/binder/netlink.rs-23-\n--\ndrivers/android/binder/netlink.rs=34= pub fn new(\n--\ndrivers/android/binder/netlink.rs-39- ) -\u003e Result\u003cSelf, kernel::alloc::AllocError\u003e {\ndrivers/android/binder/netlink.rs:40: const BINDER_CMD_REPORT: u8 = kernel::uapi::BINDER_CMD_REPORT as u8;\ndrivers/android/binder/netlink.rs-41- let skb = NetlinkSkBuff::new(size, flags)?;\ndrivers/android/binder/netlink.rs:42: let skb = skb.genlmsg_put(portid, seq, \u0026BINDER_NL_FAMILY, BINDER_CMD_REPORT)?;\ndrivers/android/binder/netlink.rs-43- Ok(Self { skb })\n--\ndrivers/android/binder/netlink.rs=47= pub fn multicast(self, portid: u32, flags: kernel::alloc::Flags) -\u003e Result {\ndrivers/android/binder/netlink.rs:48: self.skb.multicast(\u0026BINDER_NL_FAMILY, portid, 0, flags)\ndrivers/android/binder/netlink.rs-49- }\n--\ndrivers/android/binder/netlink.rs=52= pub fn has_listeners() -\u003e bool {\ndrivers/android/binder/netlink.rs:53: BINDER_NL_FAMILY.has_listeners(0)\ndrivers/android/binder/netlink.rs-54- }\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/android/binder/node.rs=737= fn cancel(self: DArc\u003cSelf\u003e) {\n--\ndrivers/android/binder/node.rs-740-\ndrivers/android/binder/node.rs:741: // We only do something on BINDER_THREAD_EXIT, not process exit.\ndrivers/android/binder/node.rs-742- if owner_inner.is_dead {\n--\ndrivers/android/binder/node.rs-745-\ndrivers/android/binder/node.rs:746: // If BINDER_THREAD_EXIT is invoked on a thread with a pending node refcount update, we\ndrivers/android/binder/node.rs-747- // should move ourselves to ensure the refcount update is still delivered.\n--\ndrivers/android/binder/node.rs=913=struct NodeDeathInner {\n--\ndrivers/android/binder/node.rs-925-/// A process can request to be notified when a process dies using `BC_REQUEST_DEATH_NOTIFICATION`.\ndrivers/android/binder/node.rs:926:/// This will make the driver send a `BR_DEAD_BINDER` to userspace when the process dies (or\ndrivers/android/binder/node.rs:927:/// immediately if it is already dead). Userspace is supposed to respond with `BC_DEAD_BINDER_DONE`\ndrivers/android/binder/node.rs-928-/// once it has processed the notification.\n--\ndrivers/android/binder/node.rs-933-/// responded with `BR_CLEAR_DEATH_NOTIFICATION_DONE`, then the kernel will still send a\ndrivers/android/binder/node.rs:934:/// `BR_DEAD_BINDER`, which userspace must be able to process. In this case, the kernel will wait\ndrivers/android/binder/node.rs:935:/// for the `BC_DEAD_BINDER_DONE` command before it sends `BR_CLEAR_DEATH_NOTIFICATION_DONE`.\ndrivers/android/binder/node.rs-936-///\ndrivers/android/binder/node.rs:937:/// Note that even if the kernel sends a `BR_DEAD_BINDER`, this does not remove the death\ndrivers/android/binder/node.rs-938-/// notification. Userspace must still remove it manually using `BC_CLEAR_DEATH_NOTIFICATION`.\n--\ndrivers/android/binder/node.rs=945=pub(crate) struct NodeDeath {\n--\ndrivers/android/binder/node.rs-958- /// Used by the process to keep track of the death notifications for which we have sent a\ndrivers/android/binder/node.rs:959: /// `BR_DEAD_BINDER` but not yet received a `BC_DEAD_BINDER_DONE`.\ndrivers/android/binder/node.rs-960- ///\n--\ndrivers/android/binder/node.rs=1098= fn do_work(\n--\ndrivers/android/binder/node.rs-1128- );\ndrivers/android/binder/node.rs:1129: BR_DEAD_BINDER\ndrivers/android/binder/node.rs-1130- };\n--\ndrivers/android/binder/node.rs-1133- writer.write_payload(\u0026cookie)?;\ndrivers/android/binder/node.rs:1134: // DEAD_BINDER notifications can cause transactions, so stop processing work items when we\ndrivers/android/binder/node.rs-1135- // get to a death notification.\ndrivers/android/binder/node.rs:1136: Ok(cmd != BR_DEAD_BINDER)\ndrivers/android/binder/node.rs-1137- }\n--\ndrivers/android/binder/node/wrapper.rs=60= fn cancel(self: DArc\u003cSelf\u003e) {\n--\ndrivers/android/binder/node/wrapper.rs-64-\ndrivers/android/binder/node/wrapper.rs:65: // We only do something on BINDER_THREAD_EXIT, not process exit.\ndrivers/android/binder/node/wrapper.rs-66- if owner_inner.is_dead {\n--\ndrivers/android/binder/page_range.rs=128=pub(crate) struct ShrinkablePageRange {\n--\ndrivers/android/binder/page_range.rs-147-// We do not define any ops. For now, used only to check identity of vmas.\ndrivers/android/binder/page_range.rs:148:static BINDER_VM_OPS: AssertSync\u003cbindings::vm_operations_struct\u003e = AssertSync(pin_init::zeroed());\ndrivers/android/binder/page_range.rs-149-\n--\ndrivers/android/binder/page_range.rs=152=fn check_vma(vma: \u0026virt::VmaRef, owner: *const ShrinkablePageRange) -\u003e Option\u003c\u0026virt::VmaMixedMap\u003e {\n--\ndrivers/android/binder/page_range.rs-154- let vm_ops = unsafe { (*vma.as_ptr()).vm_ops };\ndrivers/android/binder/page_range.rs:155: if !ptr::eq(vm_ops, \u0026BINDER_VM_OPS.0) {\ndrivers/android/binder/page_range.rs-156- return None;\n--\ndrivers/android/binder/page_range.rs=298= pub(crate) fn register_with_vma(\u0026self, vma: \u0026virt::VmaNew) -\u003e Result\u003cusize\u003e {\n--\ndrivers/android/binder/page_range.rs-346- // `vm_ops`.\ndrivers/android/binder/page_range.rs:347: unsafe { (*vma.as_ptr()).vm_ops = \u0026BINDER_VM_OPS.0 };\ndrivers/android/binder/page_range.rs-348-\n--\ndrivers/android/binder/process.rs=522= fn new(ctx: Arc\u003cContext\u003e, cred: ARef\u003cCredential\u003e) -\u003e Result\u003cArc\u003cSelf\u003e\u003e {\n--\ndrivers/android/binder/process.rs-528- inner \u003c- kernel::new_spinlock!(ProcessInner::new(), \"Process::inner\"),\ndrivers/android/binder/process.rs:529: pages \u003c- ShrinkablePageRange::new(\u0026super::BINDER_SHRINKER),\ndrivers/android/binder/process.rs-530- node_refs \u003c- kernel::new_spinlock!(ProcessNodeRefs::new(), \"Process::node_refs\"),\n--\ndrivers/android/binder/process.rs=754= fn set_as_manager(\n--\ndrivers/android/binder/process.rs-760- (\ndrivers/android/binder/process.rs:761: // SAFETY: The object type for this ioctl is implicitly `BINDER_TYPE_BINDER`, so it\ndrivers/android/binder/process.rs-762- // is safe to access the `binder` field.\n--\ndrivers/android/binder/process.rs=1666= fn ioctl_write_only(\n--\ndrivers/android/binder/process.rs-1671- ) -\u003e Result {\ndrivers/android/binder/process.rs:1672: if cmd == uapi::BINDER_FREEZE {\ndrivers/android/binder/process.rs-1673- return ioctl_freeze(reader);\n--\ndrivers/android/binder/process.rs-1677- match cmd {\ndrivers/android/binder/process.rs:1678: uapi::BINDER_SET_MAX_THREADS =\u003e this.set_max_threads(reader.read()?),\ndrivers/android/binder/process.rs:1679: uapi::BINDER_THREAD_EXIT =\u003e this.remove_thread(thread),\ndrivers/android/binder/process.rs:1680: uapi::BINDER_SET_CONTEXT_MGR =\u003e this.set_as_manager(None, \u0026thread)?,\ndrivers/android/binder/process.rs:1681: uapi::BINDER_SET_CONTEXT_MGR_EXT =\u003e {\ndrivers/android/binder/process.rs-1682- this.set_as_manager(Some(reader.read()?), \u0026thread)?\ndrivers/android/binder/process.rs-1683- }\ndrivers/android/binder/process.rs:1684: uapi::BINDER_ENABLE_ONEWAY_SPAM_DETECTION =\u003e {\ndrivers/android/binder/process.rs-1685- this.set_oneway_spam_detection_enabled(reader.read()?)\n--\ndrivers/android/binder/process.rs=1695= fn ioctl_write_read(\n--\ndrivers/android/binder/process.rs-1702- match cmd {\ndrivers/android/binder/process.rs:1703: uapi::BINDER_WRITE_READ =\u003e this.get_current_thread()?.write_read(data, blocking)?,\ndrivers/android/binder/process.rs:1704: uapi::BINDER_GET_NODE_DEBUG_INFO =\u003e this.get_node_debug_info(data)?,\ndrivers/android/binder/process.rs:1705: uapi::BINDER_GET_NODE_INFO_FOR_REF =\u003e this.get_node_info_from_ref(data)?,\ndrivers/android/binder/process.rs:1706: uapi::BINDER_VERSION =\u003e this.version(data)?,\ndrivers/android/binder/process.rs:1707: uapi::BINDER_GET_FROZEN_INFO =\u003e get_frozen_status(data)?,\ndrivers/android/binder/process.rs:1708: uapi::BINDER_GET_EXTENDED_ERROR =\u003e {\ndrivers/android/binder/process.rs-1709- this.get_current_thread()?.get_extended_error(data)?\n--\ndrivers/android/binder/rust_binder.h-5-\ndrivers/android/binder/rust_binder.h:6:#ifndef _LINUX_RUST_BINDER_H\ndrivers/android/binder/rust_binder.h:7:#define _LINUX_RUST_BINDER_H\ndrivers/android/binder/rust_binder.h-8-\n--\ndrivers/android/binder/rust_binder.h=52=struct rust_binder_layout {\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-{\ndrivers/android/binder/rust_binder.h:62:\treturn *(size_t *) (t + RUST_BINDER_LAYOUT.t.debug_id);\ndrivers/android/binder/rust_binder.h-63-}\n--\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-{\ndrivers/android/binder/rust_binder.h:67:\treturn *(u32 *) (t + RUST_BINDER_LAYOUT.t.code);\ndrivers/android/binder/rust_binder.h-68-}\n--\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-{\ndrivers/android/binder/rust_binder.h:72:\treturn *(u32 *) (t + RUST_BINDER_LAYOUT.t.flags);\ndrivers/android/binder/rust_binder.h-73-}\n--\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-{\ndrivers/android/binder/rust_binder.h:78:\tvoid *p = *(void **) (t + RUST_BINDER_LAYOUT.t.target_node);\ndrivers/android/binder/rust_binder.h-79-\ndrivers/android/binder/rust_binder.h-80-\tif (p)\ndrivers/android/binder/rust_binder.h:81:\t\tp = p + RUST_BINDER_LAYOUT.n.arc_offset;\ndrivers/android/binder/rust_binder.h-82-\treturn p;\n--\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-{\ndrivers/android/binder/rust_binder.h:87:\tvoid *p = *(void **) (t + RUST_BINDER_LAYOUT.t.to_proc);\ndrivers/android/binder/rust_binder.h-88-\ndrivers/android/binder/rust_binder.h:89:\treturn p + RUST_BINDER_LAYOUT.p.arc_offset;\ndrivers/android/binder/rust_binder.h-90-}\n--\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-{\ndrivers/android/binder/rust_binder.h:94:\treturn *(struct task_struct **) (t + RUST_BINDER_LAYOUT.p.task);\ndrivers/android/binder/rust_binder.h-95-}\n--\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-{\ndrivers/android/binder/rust_binder.h:99:\treturn *(size_t *) (t + RUST_BINDER_LAYOUT.n.debug_id);\ndrivers/android/binder/rust_binder.h-100-}\n--\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-{\ndrivers/android/binder/rust_binder.h:104:\treturn *(binder_uintptr_t *) (t + RUST_BINDER_LAYOUT.n.ptr);\ndrivers/android/binder/rust_binder.h-105-}\n--\ndrivers/android/binder/rust_binder_events.c=11=const char * const binder_command_strings[] = {\n--\ndrivers/android/binder/rust_binder_events.c-27-\t\"BC_CLEAR_DEATH_NOTIFICATION\",\ndrivers/android/binder/rust_binder_events.c:28:\t\"BC_DEAD_BINDER_DONE\",\ndrivers/android/binder/rust_binder_events.c-29-\t\"BC_TRANSACTION_SG\",\n--\ndrivers/android/binder/rust_binder_events.c=36=const char * const binder_return_strings[] = {\n--\ndrivers/android/binder/rust_binder_events.c-51-\t\"BR_FINISHED\",\ndrivers/android/binder/rust_binder_events.c:52:\t\"BR_DEAD_BINDER\",\ndrivers/android/binder/rust_binder_events.c-53-\t\"BR_CLEAR_DEATH_NOTIFICATION_DONE\",\n--\ndrivers/android/binder/rust_binder_events.c-57-\t\"BR_TRANSACTION_PENDING_FROZEN\",\ndrivers/android/binder/rust_binder_events.c:58:\t\"BR_FROZEN_BINDER\",\ndrivers/android/binder/rust_binder_events.c-59-\t\"BR_CLEAR_FREEZE_NOTIFICATION_DONE\",\n--\ndrivers/android/binder/rust_binder_events.h-12-\ndrivers/android/binder/rust_binder_events.h:13:#if !defined(_RUST_BINDER_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)\ndrivers/android/binder/rust_binder_events.h:14:#define _RUST_BINDER_TRACE_H\ndrivers/android/binder/rust_binder_events.h-15-\n--\ndrivers/android/binder/rust_binder_events.h=33=DECLARE_EVENT_CLASS(binder_function_return_class,\n--\ndrivers/android/binder/rust_binder_events.h-44-\ndrivers/android/binder/rust_binder_events.h:45:#define DEFINE_RBINDER_FUNCTION_RETURN_EVENT(name)\t\\\ndrivers/android/binder/rust_binder_events.h-46-DEFINE_EVENT(binder_function_return_class, name,\t\\\n--\ndrivers/android/binder/rust_binder_events.h-49-\ndrivers/android/binder/rust_binder_events.h:50:DEFINE_RBINDER_FUNCTION_RETURN_EVENT(binder_ioctl_done);\ndrivers/android/binder/rust_binder_events.h:51:DEFINE_RBINDER_FUNCTION_RETURN_EVENT(binder_read_done);\ndrivers/android/binder/rust_binder_events.h:52:DEFINE_RBINDER_FUNCTION_RETURN_EVENT(binder_write_done);\ndrivers/android/binder/rust_binder_events.h-53-\n--\ndrivers/android/binder/rust_binder_events.h=164=TRACE_EVENT(binder_return,\n--\ndrivers/android/binder/rust_binder_events.h-179-\ndrivers/android/binder/rust_binder_events.h:180:#endif /* _RUST_BINDER_TRACE_H */\ndrivers/android/binder/rust_binder_events.h-181-\n--\ndrivers/android/binder/rust_binder_internal.h-13-\ndrivers/android/binder/rust_binder_internal.h:14:#ifndef _LINUX_RUST_BINDER_INTERNAL_H\ndrivers/android/binder/rust_binder_internal.h:15:#define _LINUX_RUST_BINDER_INTERNAL_H\ndrivers/android/binder/rust_binder_internal.h-16-\ndrivers/android/binder/rust_binder_internal.h:17:#define RUST_BINDERFS_SUPER_MAGIC\t0x6c6f6f71\ndrivers/android/binder/rust_binder_internal.h-18-\n--\ndrivers/android/binder/rust_binder_internal.h=77=struct binderfs_info {\n--\ndrivers/android/binder/rust_binder_internal.h-86-\ndrivers/android/binder/rust_binder_internal.h:87:#endif /* _LINUX_RUST_BINDER_INTERNAL_H */\n--\ndrivers/android/binder/rust_binder_main.rs=72= fn default() -\u003e Self {\n--\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=130= fn len(\u0026self) -\u003e usize {\n--\ndrivers/android/binder/rust_binder_main.rs-134-\ndrivers/android/binder/rust_binder_main.rs:135:/// Specifies how a type should be delivered to the read part of a BINDER_WRITE_READ ioctl.\ndrivers/android/binder/rust_binder_main.rs-136-///\n--\ndrivers/android/binder/rust_binder_main.rs=291=fn ptr_align(value: usize) -\u003e Option\u003cusize\u003e {\n--\ndrivers/android/binder/rust_binder_main.rs-296-// SAFETY: We call register in `init`.\ndrivers/android/binder/rust_binder_main.rs:297:static BINDER_SHRINKER: Shrinker = unsafe { Shrinker::new() };\ndrivers/android/binder/rust_binder_main.rs-298-\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\")?;\ndrivers/android/binder/rust_binder_main.rs-310-\n--\ndrivers/android/binder/rust_binderfs.c-41-#define INODE_OFFSET 3\ndrivers/android/binder/rust_binderfs.c:42:#define BINDERFS_MAX_MINOR (1U \u003c\u003c MINORBITS)\ndrivers/android/binder/rust_binderfs.c-43-/* Ensure that the initial ipc namespace always has devices available. */\ndrivers/android/binder/rust_binderfs.c:44:#define BINDERFS_MAX_MINOR_CAPPED (BINDERFS_MAX_MINOR - 4)\ndrivers/android/binder/rust_binderfs.c-45-\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(devices, rust_binder_devices_param, charp, 0444);\n--\ndrivers/android/binder/rust_binderfs.c=89=static struct binder_features binder_features = {\n--\ndrivers/android/binder/rust_binderfs.c-95-\ndrivers/android/binder/rust_binderfs.c:96:static inline struct binderfs_info *BINDERFS_SB(const struct super_block *sb)\ndrivers/android/binder/rust_binderfs.c-97-{\n--\ndrivers/android/binder/rust_binderfs.c=119=static int binderfs_binder_device_create(struct inode *ref_inode,\n--\ndrivers/android/binder/rust_binderfs.c-139-\t\tminor = ida_alloc_max(\u0026binderfs_minors,\ndrivers/android/binder/rust_binderfs.c:140:\t\t\t\t use_reserve ? BINDERFS_MAX_MINOR - 1 :\ndrivers/android/binder/rust_binderfs.c:141:\t\t\t\t\t\t BINDERFS_MAX_MINOR_CAPPED - 1,\ndrivers/android/binder/rust_binderfs.c-142-\t\t\t\t GFP_KERNEL);\n--\ndrivers/android/binder/rust_binderfs.c-156-\ndrivers/android/binder/rust_binderfs.c:157:\treq-\u003ename[BINDERFS_MAX_NAME] = '\\0'; /* NUL-terminate */\ndrivers/android/binder/rust_binderfs.c-158-\n--\ndrivers/android/binder/rust_binderfs.c-216- * the binderfs mount the binder-control device resides in:\ndrivers/android/binder/rust_binderfs.c:217: * - BINDER_CTL_ADD\ndrivers/android/binder/rust_binderfs.c-218- * Allocate a new binder device.\n--\ndrivers/android/binder/rust_binderfs.c=222=static long binder_ctl_ioctl(struct file *file, unsigned int cmd,\n--\ndrivers/android/binder/rust_binderfs.c-230-\tswitch (cmd) {\ndrivers/android/binder/rust_binderfs.c:231:\tcase BINDER_CTL_ADD:\ndrivers/android/binder/rust_binderfs.c-232-\t\tret = copy_from_user(\u0026device_req, device, sizeof(device_req));\n--\ndrivers/android/binder/rust_binderfs.c=247=static void binderfs_evict_inode(struct inode *inode)\n--\ndrivers/android/binder/rust_binderfs.c-249-\tstruct binder_device *device = inode-\u003ei_private;\ndrivers/android/binder/rust_binderfs.c:250:\tstruct binderfs_info *info = BINDERFS_SB(inode-\u003ei_sb);\ndrivers/android/binder/rust_binderfs.c-251-\n--\ndrivers/android/binder/rust_binderfs.c=268=static int binderfs_fs_context_parse_param(struct fs_context *fc,\n--\ndrivers/android/binder/rust_binderfs.c-280-\tcase Opt_max:\ndrivers/android/binder/rust_binderfs.c:281:\t\tif (result.uint_32 \u003e BINDERFS_MAX_MINOR)\ndrivers/android/binder/rust_binderfs.c-282-\t\t\treturn invalfc(fc, \"Bad value for '%s'\", param-\u003ekey);\n--\ndrivers/android/binder/rust_binderfs.c=299=static int binderfs_fs_context_reconfigure(struct fs_context *fc)\n--\ndrivers/android/binder/rust_binderfs.c-301-\tstruct binderfs_mount_opts *ctx = fc-\u003efs_private;\ndrivers/android/binder/rust_binderfs.c:302:\tstruct binderfs_info *info = BINDERFS_SB(fc-\u003eroot-\u003ed_sb);\ndrivers/android/binder/rust_binderfs.c-303-\n--\ndrivers/android/binder/rust_binderfs.c=312=static int binderfs_show_options(struct seq_file *seq, struct dentry *root)\ndrivers/android/binder/rust_binderfs.c-313-{\ndrivers/android/binder/rust_binderfs.c:314:\tstruct binderfs_info *info = BINDERFS_SB(root-\u003ed_sb);\ndrivers/android/binder/rust_binderfs.c-315-\ndrivers/android/binder/rust_binderfs.c:316:\tif (info-\u003emount_opts.max \u003c= BINDERFS_MAX_MINOR)\ndrivers/android/binder/rust_binderfs.c-317-\t\tseq_printf(seq, \",max=%d\", info-\u003emount_opts.max);\n--\ndrivers/android/binder/rust_binderfs.c=381=static int binderfs_binder_ctl_create(struct super_block *sb)\n--\n\n"
} |
| 37/2 | 2026/09/28 03:36 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 37227 output: 32 thoughts: 42 Thoughts: Okay, here's my interpretation of that thought process, assuming I'm deep in the weeds of kernel development: **Initial Assessment: Rust Binder IPC Spotted!** Right, *`ANDROID_BINDER_IPC_RUST`* is here, in this kernel tree! This is significant. It means we're dealing with a Rust implementation of Binder IPC, which is a major shift. Now, where is this feature defined in the configuration files? The first place to look is always `drivers/android/Kconfig`. That's the usual home for Android-specific driver configurations, and since we're dealing with Binder, which is essentially the Android driver for process communication, that's the obvious starting point. I need to understand how this is enabled, what dependencies it might have, and how it's interacting with the existing Binder infrastructure. Let's see what the Kconfig file reveals... |
| 38/2 | 2026/09/28 03:36 | tool | read-file |
0mArgs:{
"File": "drivers/android/Kconfig",
"FirstLine": 1,
"LineCount": 40
}Results: {
"Contents": " 1:\t# SPDX-License-Identifier: GPL-2.0\n 2:\tmenu \"Android\"\n 3:\t\n 4:\tconfig ANDROID_BINDER_IPC_RUST\n 5:\t\tbool \"Android Binder IPC Driver\"\n 6:\t\tdepends on MMU\n 7:\t\tdepends on NET\n 8:\t\tdepends on RUST\n 9:\t\tdefault n\n 10:\t\thelp\n 11:\t\t Binder is used in Android for both communication between processes,\n 12:\t\t and remote method invocation.\n 13:\t\n 14:\t\t This means one Android process can call a method/routine in another\n 15:\t\t Android process, using Binder to identify, invoke and pass arguments\n 16:\t\t between said processes.\n 17:\t\n 18:\tconfig ANDROID_BINDER_DEVICES\n 19:\t\tstring \"Android Binder devices\"\n 20:\t\tdepends on ANDROID_BINDER_IPC_RUST\n 21:\t\tdefault \"binder,hwbinder,vndbinder\"\n 22:\t\thelp\n 23:\t\t Default value for the binder.devices parameter.\n 24:\t\n 25:\t\t The binder.devices parameter is a comma-separated list of strings\n 26:\t\t that specifies the names of the binder device nodes that will be\n 27:\t\t created. Each binder device has its own context manager, and is\n 28:\t\t therefore logically separated from the other devices.\n 29:\t\n 30:\tendmenu\n"
} |
| 39/2 | 2026/09/28 03:36 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 37873 output: 25 thoughts: 107 Thoughts: Okay, let's see what we have here. **Initial Assessment of Rust-for-Linux Concurrency Constructs** Hmm, interesting. It appears we're looking at a branch tree, specifically `ANDROID_BINDER_IPC_RUST` – an experimental downstream effort to bring Rust into the Linux kernel context. And, judging by the name, it seems related to Binder IPC. Now, let's see what other parts of the codebase are using the same concurrency primitives. My immediate thought is to check what else might be utilizing `CondVar`. A quick scan of the code earlier turned up a few interesting files: `rust/kernel/sync/lock/spinlock.rs`, and also `rust/kernel/sync/poll.rs` which features `PollCondVar` and `PollCondVarBox`. We need to understand the relationship between these synchronization constructs. Now, the natural next step is to trace the usage of `PollCondVar` and `PollCondVarBox`. Knowing *where* those are used will give us context and help me understand the implications of these Rust concurrency primitives within the broader kernel architecture. Understanding *how* they're used is paramount. |
| 40/2 | 2026/09/28 03:36 | tool | grepper |
0mArgs:{
"Expression": "PollCondVar",
"PathPrefix": "rust/"
}Results: {
"Output": "rust/kernel/sync/poll.rs-24-\nrust/kernel/sync/poll.rs:25:/// Creates a [`PollCondVar`] initialiser with the given name and a newly-created lock class.\nrust/kernel/sync/poll.rs-26-#[macro_export]\nrust/kernel/sync/poll.rs=27=macro_rules! new_poll_condvar {\nrust/kernel/sync/poll.rs-28- ($($name:literal)?) =\u003e {\nrust/kernel/sync/poll.rs:29: $crate::sync::poll::PollCondVar::new(\nrust/kernel/sync/poll.rs-30- $crate::optional_name!($($name)?), $crate::static_lock_class!()\n--\nrust/kernel/sync/poll.rs=52= pub unsafe fn from_raw(table: *mut bindings::poll_table) -\u003e Self {\n--\nrust/kernel/sync/poll.rs-59-\nrust/kernel/sync/poll.rs:60: /// Register this [`PollTable`] with the provided [`PollCondVar`], so that it can be notified\nrust/kernel/sync/poll.rs-61- /// using the condition variable.\nrust/kernel/sync/poll.rs:62: pub fn register_wait(\u0026self, file: \u0026File, cv: \u0026PollCondVar) {\nrust/kernel/sync/poll.rs-63- // SAFETY:\n--\nrust/kernel/sync/poll.rs-65- // * `self.table` is null or references a valid poll_table for the duration of this call.\nrust/kernel/sync/poll.rs:66: // * Since `PollCondVar` is pinned, its destructor is guaranteed to run before the memory\nrust/kernel/sync/poll.rs-67- // containing `cv.wait_queue_head` is invalidated. Since the destructor clears all\n--\nrust/kernel/sync/poll.rs-79-#[repr(transparent)]\nrust/kernel/sync/poll.rs:80:pub struct PollCondVar {\nrust/kernel/sync/poll.rs-81- #[pin]\n--\nrust/kernel/sync/poll.rs-84-\nrust/kernel/sync/poll.rs:85:impl PollCondVar {\nrust/kernel/sync/poll.rs-86- /// Constructs a new condvar initialiser.\nrust/kernel/sync/poll.rs=87= pub fn new(name: \u0026'static CStr, key: Pin\u003c\u0026'static LockClassKey\u003e) -\u003e impl PinInit\u003cSelf\u003e {\n--\nrust/kernel/sync/poll.rs-93-\nrust/kernel/sync/poll.rs:94:// Make the `CondVar` methods callable on `PollCondVar`.\nrust/kernel/sync/poll.rs:95:impl Deref for PollCondVar {\nrust/kernel/sync/poll.rs-96- type Target = CondVar;\n--\nrust/kernel/sync/poll.rs=98= fn deref(\u0026self) -\u003e \u0026CondVar {\n--\nrust/kernel/sync/poll.rs-103-#[pinned_drop]\nrust/kernel/sync/poll.rs:104:impl PinnedDrop for PollCondVar {\nrust/kernel/sync/poll.rs-105- #[inline]\nrust/kernel/sync/poll.rs=106= fn drop(self: Pin\u003c\u0026mut Self\u003e) {\n--\nrust/kernel/sync/poll.rs-116-\nrust/kernel/sync/poll.rs:117:/// A [`KBox\u003cPollCondVar\u003e`] that uses `kfree_rcu`.\nrust/kernel/sync/poll.rs-118-///\nrust/kernel/sync/poll.rs:119:/// [`KBox\u003cPollCondVar\u003e`]: PollCondVar\nrust/kernel/sync/poll.rs:120:pub struct PollCondVarBox {\nrust/kernel/sync/poll.rs:121: inner: ManuallyDrop\u003cPin\u003cKBox\u003cPollCondVarBoxInner\u003e\u003e\u003e,\nrust/kernel/sync/poll.rs-122-}\n--\nrust/kernel/sync/poll.rs-125-#[repr(C)]\nrust/kernel/sync/poll.rs:126:struct PollCondVarBoxInner {\nrust/kernel/sync/poll.rs-127- #[pin]\nrust/kernel/sync/poll.rs:128: inner: PollCondVar,\nrust/kernel/sync/poll.rs-129- rcu: Opaque\u003cbindings::kvfree_rcu_head\u003e,\n--\nrust/kernel/sync/poll.rs-131-\nrust/kernel/sync/poll.rs:132:// SAFETY: PollCondVar is Send\nrust/kernel/sync/poll.rs:133:unsafe impl Send for PollCondVarBoxInner {}\nrust/kernel/sync/poll.rs:134:// SAFETY: PollCondVar is Sync\nrust/kernel/sync/poll.rs:135:unsafe impl Sync for PollCondVarBoxInner {}\nrust/kernel/sync/poll.rs-136-\nrust/kernel/sync/poll.rs:137:impl PollCondVarBox {\nrust/kernel/sync/poll.rs:138: /// Constructs a new boxed [`PollCondVar`].\nrust/kernel/sync/poll.rs-139- pub fn new(name: \u0026'static CStr, key: Pin\u003c\u0026'static LockClassKey\u003e) -\u003e Result\u003cSelf, AllocError\u003e {\nrust/kernel/sync/poll.rs-140- let b = KBox::pin_init(\nrust/kernel/sync/poll.rs:141: pin_init!(PollCondVarBoxInner {\nrust/kernel/sync/poll.rs:142: inner \u003c- PollCondVar::new(name, key),\nrust/kernel/sync/poll.rs-143- rcu: Opaque::uninit(),\n--\nrust/kernel/sync/poll.rs-148-\nrust/kernel/sync/poll.rs:149: Ok(PollCondVarBox {\nrust/kernel/sync/poll.rs-150- inner: ManuallyDrop::new(b),\n--\nrust/kernel/sync/poll.rs-154-\nrust/kernel/sync/poll.rs:155:impl Deref for PollCondVarBox {\nrust/kernel/sync/poll.rs:156: type Target = PollCondVar;\nrust/kernel/sync/poll.rs:157: fn deref(\u0026self) -\u003e \u0026PollCondVar {\nrust/kernel/sync/poll.rs-158- \u0026self.inner.inner\n--\nrust/kernel/sync/poll.rs-161-\nrust/kernel/sync/poll.rs:162:impl Drop for PollCondVarBox {\nrust/kernel/sync/poll.rs-163- #[inline]\n"
} |
| 41/2 | 2026/09/28 03:36 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 39934 output: 17 thoughts: 17 Thoughts: Okay, here's my thought process as I delve into this code, tailored for an expert audience: **Analyzing `PollCondVar` Usage Across the Codebase** Alright, let's get down to brass tacks. I need to understand the scope and impact of `PollCondVar`. My initial step is clear: I need to quickly identify *every* instance where `PollCondVar` is used throughout the codebase. This is foundational. Knowing where it's employed is the only way to effectively grasp its role and potential implications. I'm thinking I'll need a fast search – maybe leveraging my preferred IDE's search function or, depending on the project structure, perhaps a more powerful code search utility. I need *all* the hits, the raw data, before I can even start to draw any conclusions or think about refactoring strategies. |
| 42/2 | 2026/09/28 03:36 | tool | grepper |
0mArgs:{
"Expression": "PollCondVar"
}Results: {
"Output": "drivers/android/binder/process.rs-33- lock::{spinlock::SpinLockBackend, Guard},\ndrivers/android/binder/process.rs:34: poll::PollCondVarBox,\ndrivers/android/binder/process.rs-35- Arc, ArcBorrow, CondVar, CondVarTimeoutResult, SetOnce, SpinLock, UniqueArc,\n--\ndrivers/android/binder/process.rs=446=pub(crate) struct Process {\n--\ndrivers/android/binder/process.rs-470-\ndrivers/android/binder/process.rs:471: // Synchronizes `register_wait` calls to the `PollCondVarBox`.\ndrivers/android/binder/process.rs-472- //\ndrivers/android/binder/process.rs:473: // The `PollCondVarBox` is not stored here because synchronization is\ndrivers/android/binder/process.rs-474- // done for `register_wait` only. Wakeups do not take this lock.\ndrivers/android/binder/process.rs:475: poll: SetOnce\u003cPollCondVarBox\u003e,\ndrivers/android/binder/process.rs-476-\n--\ndrivers/android/binder/process.rs=1801= pub(crate) fn poll(\n--\ndrivers/android/binder/process.rs-1812-\ndrivers/android/binder/process.rs:1813: let poll = PollCondVarBox::new(c\"Process::poll\", kernel::static_lock_class!())?;\ndrivers/android/binder/process.rs-1814- // Reuse our existing lock to synchronize callers initializing.\n--\nrust/kernel/sync/poll.rs-24-\nrust/kernel/sync/poll.rs:25:/// Creates a [`PollCondVar`] initialiser with the given name and a newly-created lock class.\nrust/kernel/sync/poll.rs-26-#[macro_export]\nrust/kernel/sync/poll.rs=27=macro_rules! new_poll_condvar {\nrust/kernel/sync/poll.rs-28- ($($name:literal)?) =\u003e {\nrust/kernel/sync/poll.rs:29: $crate::sync::poll::PollCondVar::new(\nrust/kernel/sync/poll.rs-30- $crate::optional_name!($($name)?), $crate::static_lock_class!()\n--\nrust/kernel/sync/poll.rs=52= pub unsafe fn from_raw(table: *mut bindings::poll_table) -\u003e Self {\n--\nrust/kernel/sync/poll.rs-59-\nrust/kernel/sync/poll.rs:60: /// Register this [`PollTable`] with the provided [`PollCondVar`], so that it can be notified\nrust/kernel/sync/poll.rs-61- /// using the condition variable.\nrust/kernel/sync/poll.rs:62: pub fn register_wait(\u0026self, file: \u0026File, cv: \u0026PollCondVar) {\nrust/kernel/sync/poll.rs-63- // SAFETY:\n--\nrust/kernel/sync/poll.rs-65- // * `self.table` is null or references a valid poll_table for the duration of this call.\nrust/kernel/sync/poll.rs:66: // * Since `PollCondVar` is pinned, its destructor is guaranteed to run before the memory\nrust/kernel/sync/poll.rs-67- // containing `cv.wait_queue_head` is invalidated. Since the destructor clears all\n--\nrust/kernel/sync/poll.rs-79-#[repr(transparent)]\nrust/kernel/sync/poll.rs:80:pub struct PollCondVar {\nrust/kernel/sync/poll.rs-81- #[pin]\n--\nrust/kernel/sync/poll.rs-84-\nrust/kernel/sync/poll.rs:85:impl PollCondVar {\nrust/kernel/sync/poll.rs-86- /// Constructs a new condvar initialiser.\nrust/kernel/sync/poll.rs=87= pub fn new(name: \u0026'static CStr, key: Pin\u003c\u0026'static LockClassKey\u003e) -\u003e impl PinInit\u003cSelf\u003e {\n--\nrust/kernel/sync/poll.rs-93-\nrust/kernel/sync/poll.rs:94:// Make the `CondVar` methods callable on `PollCondVar`.\nrust/kernel/sync/poll.rs:95:impl Deref for PollCondVar {\nrust/kernel/sync/poll.rs-96- type Target = CondVar;\n--\nrust/kernel/sync/poll.rs=98= fn deref(\u0026self) -\u003e \u0026CondVar {\n--\nrust/kernel/sync/poll.rs-103-#[pinned_drop]\nrust/kernel/sync/poll.rs:104:impl PinnedDrop for PollCondVar {\nrust/kernel/sync/poll.rs-105- #[inline]\nrust/kernel/sync/poll.rs=106= fn drop(self: Pin\u003c\u0026mut Self\u003e) {\n--\nrust/kernel/sync/poll.rs-116-\nrust/kernel/sync/poll.rs:117:/// A [`KBox\u003cPollCondVar\u003e`] that uses `kfree_rcu`.\nrust/kernel/sync/poll.rs-118-///\nrust/kernel/sync/poll.rs:119:/// [`KBox\u003cPollCondVar\u003e`]: PollCondVar\nrust/kernel/sync/poll.rs:120:pub struct PollCondVarBox {\nrust/kernel/sync/poll.rs:121: inner: ManuallyDrop\u003cPin\u003cKBox\u003cPollCondVarBoxInner\u003e\u003e\u003e,\nrust/kernel/sync/poll.rs-122-}\n--\nrust/kernel/sync/poll.rs-125-#[repr(C)]\nrust/kernel/sync/poll.rs:126:struct PollCondVarBoxInner {\nrust/kernel/sync/poll.rs-127- #[pin]\nrust/kernel/sync/poll.rs:128: inner: PollCondVar,\nrust/kernel/sync/poll.rs-129- rcu: Opaque\u003cbindings::kvfree_rcu_head\u003e,\n--\nrust/kernel/sync/poll.rs-131-\nrust/kernel/sync/poll.rs:132:// SAFETY: PollCondVar is Send\nrust/kernel/sync/poll.rs:133:unsafe impl Send for PollCondVarBoxInner {}\nrust/kernel/sync/poll.rs:134:// SAFETY: PollCondVar is Sync\nrust/kernel/sync/poll.rs:135:unsafe impl Sync for PollCondVarBoxInner {}\nrust/kernel/sync/poll.rs-136-\nrust/kernel/sync/poll.rs:137:impl PollCondVarBox {\nrust/kernel/sync/poll.rs:138: /// Constructs a new boxed [`PollCondVar`].\nrust/kernel/sync/poll.rs-139- pub fn new(name: \u0026'static CStr, key: Pin\u003c\u0026'static LockClassKey\u003e) -\u003e Result\u003cSelf, AllocError\u003e {\nrust/kernel/sync/poll.rs-140- let b = KBox::pin_init(\nrust/kernel/sync/poll.rs:141: pin_init!(PollCondVarBoxInner {\nrust/kernel/sync/poll.rs:142: inner \u003c- PollCondVar::new(name, key),\nrust/kernel/sync/poll.rs-143- rcu: Opaque::uninit(),\n--\nrust/kernel/sync/poll.rs-148-\nrust/kernel/sync/poll.rs:149: Ok(PollCondVarBox {\nrust/kernel/sync/poll.rs-150- inner: ManuallyDrop::new(b),\n--\nrust/kernel/sync/poll.rs-154-\nrust/kernel/sync/poll.rs:155:impl Deref for PollCondVarBox {\nrust/kernel/sync/poll.rs:156: type Target = PollCondVar;\nrust/kernel/sync/poll.rs:157: fn deref(\u0026self) -\u003e \u0026PollCondVar {\nrust/kernel/sync/poll.rs-158- \u0026self.inner.inner\n--\nrust/kernel/sync/poll.rs-161-\nrust/kernel/sync/poll.rs:162:impl Drop for PollCondVarBox {\nrust/kernel/sync/poll.rs-163- #[inline]\n"
} |
| 43/2 | 2026/09/28 03:36 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 42225 output: 16 thoughts: 176 Thoughts: **My Initial Investigation into Rust Abstractions** Okay, let's break this down. My initial hunch is that `CondVar` is worth a look – it's used within the Rust binder implementation in the Android drivers (`drivers/android/binder`), and that code path is only enabled if `CONFIG_ANDROID_BINDER_IPC_RUST` is set. That's a starting point, but I'm probably jumping ahead. Hold on, I need to consider other areas. I should also check `GenDiskBuilder::build`; that seems connected to the Rust null block device driver (`CONFIG_BLK_DEV_RUST_NULL`), so it’s likely to be interesting too. Then there's `serdev`; the fact that `rust/kernel/serdev.rs` implements a serial device driver, and there's a sample driver in `rust_driver_serdev.rs`, means it could expose more interesting Rust usage. Now, let's get back to basics. I want to understand what's really happening here. Let me concentrate on `DropGuard` itself; it looks like a new RAII abstraction defined in `rust/kernel/mem.rs`. I need to figure out the scope of it. Okay, next step: let's go a level deeper. Instead of just focusing on the definitions, I'm going to search the entire codebase for uses of `DropGuard`. I need to understand the practical applications of this abstraction to fully grasp its implications. That should give me a good sense of its role in the system. |
| 44/2 | 2026/09/28 03:37 | tool | grepper |
0mArgs:{
"Expression": "DropGuard"
}Results: {
"Output": "rust/kernel/Kconfig.test=36=config RUST_DROP_GUARD_KUNIT_TEST\nrust/kernel/Kconfig.test:37:\tbool \"KUnit tests for Rust DropGuard API\" if !KUNIT_ALL_TESTS\nrust/kernel/Kconfig.test-38-\tdefault KUNIT_ALL_TESTS\nrust/kernel/Kconfig.test-39-\thelp\nrust/kernel/Kconfig.test:40:\t This option enables KUnit tests for the Rust DropGuard API.\nrust/kernel/Kconfig.test-41-\t These are only for development and testing, not for regular\n--\nrust/kernel/block/mq/gen_disk.rs-12- fmt::{self, Write},\nrust/kernel/block/mq/gen_disk.rs:13: mem::DropGuard,\nrust/kernel/block/mq/gen_disk.rs-14- prelude::*,\n--\nrust/kernel/block/mq/gen_disk.rs=99= pub fn build\u003cT: Operations\u003e(\n--\nrust/kernel/block/mq/gen_disk.rs-105- let data = queue_data.into_foreign();\nrust/kernel/block/mq/gen_disk.rs:106: let recover_data = DropGuard::new((), |_| {\nrust/kernel/block/mq/gen_disk.rs-107- // SAFETY: T::QueueData was created by the call to `into_foreign()` above\n--\nrust/kernel/block/mq/gen_disk.rs-153-\nrust/kernel/block/mq/gen_disk.rs:154: let cleanup_failure = DropGuard::new((gendisk, data), |(gendisk, data)| {\nrust/kernel/block/mq/gen_disk.rs-155- // SAFETY: `gendisk` came from `__blk_mq_alloc_disk()` above and\n--\nrust/kernel/block/mq/gen_disk.rs-164- // must not run on this path anymore.\nrust/kernel/block/mq/gen_disk.rs:165: DropGuard::dismiss(recover_data);\nrust/kernel/block/mq/gen_disk.rs-166-\n--\nrust/kernel/block/mq/gen_disk.rs-188-\nrust/kernel/block/mq/gen_disk.rs:189: DropGuard::dismiss(cleanup_failure);\nrust/kernel/block/mq/gen_disk.rs-190-\n--\nrust/kernel/mem.rs-15-///\nrust/kernel/mem.rs:16:/// The [`DropGuard::dismiss`] function can be used to take ownership of the wrapped\nrust/kernel/mem.rs-17-/// value without running the cleanup function.\n--\nrust/kernel/mem.rs-19-#[doc(alias = \"defer\")]\nrust/kernel/mem.rs:20:pub struct DropGuard\u003cT, F\u003e\nrust/kernel/mem.rs-21-where\n--\nrust/kernel/mem.rs-27-\nrust/kernel/mem.rs:28:impl\u003cT, F\u003e DropGuard\u003cT, F\u003e\nrust/kernel/mem.rs-29-where\n--\nrust/kernel/mem.rs-31-{\nrust/kernel/mem.rs:32: /// Creates a new `DropGuard`.\nrust/kernel/mem.rs-33- #[inline]\n--\nrust/kernel/mem.rs=35= pub fn new(inner: T, f: F) -\u003e Self {\n--\nrust/kernel/mem.rs-41-\nrust/kernel/mem.rs:42: /// Consumes the `DropGuard`, returning the wrapped value without\nrust/kernel/mem.rs-43- /// running the cleanup function.\n--\nrust/kernel/mem.rs=45= pub fn dismiss(guard: Self) -\u003e T {\n--\nrust/kernel/mem.rs-57-\nrust/kernel/mem.rs:58:impl\u003cT, F\u003e Deref for DropGuard\u003cT, F\u003e\nrust/kernel/mem.rs-59-where\n--\nrust/kernel/mem.rs=65= fn deref(\u0026self) -\u003e \u0026T {\n--\nrust/kernel/mem.rs-69-\nrust/kernel/mem.rs:70:impl\u003cT, F\u003e DerefMut for DropGuard\u003cT, F\u003e\nrust/kernel/mem.rs-71-where\n--\nrust/kernel/mem.rs=75= fn deref_mut(\u0026mut self) -\u003e \u0026mut T {\n--\nrust/kernel/mem.rs-79-\nrust/kernel/mem.rs:80:impl\u003cT, F\u003e Drop for DropGuard\u003cT, F\u003e\nrust/kernel/mem.rs-81-where\n--\nrust/kernel/mem.rs=85= fn drop(\u0026mut self) {\nrust/kernel/mem.rs:86: // SAFETY: `DropGuard` is in the process of being dropped.\nrust/kernel/mem.rs-87- let inner = unsafe { ManuallyDrop::take(\u0026mut self.inner) };\nrust/kernel/mem.rs-88-\nrust/kernel/mem.rs:89: // SAFETY: `DropGuard` is in the process of being dropped.\nrust/kernel/mem.rs-90- let f = unsafe { ManuallyDrop::take(\u0026mut self.f) };\n--\nrust/kernel/mem.rs=331= fn test_drop_runs_cleanup() {\n--\nrust/kernel/mem.rs-334- {\nrust/kernel/mem.rs:335: let _guard = DropGuard::new(42, |value| {\nrust/kernel/mem.rs-336- assert_eq!(value, 42);\n--\nrust/kernel/mem.rs=345= fn test_dismiss_returns_value_without_cleanup() {\n--\nrust/kernel/mem.rs-347-\nrust/kernel/mem.rs:348: let guard = DropGuard::new(42, |_| {\nrust/kernel/mem.rs-349- cleaned = true;\n--\nrust/kernel/mem.rs-351-\nrust/kernel/mem.rs:352: let value = DropGuard::dismiss(guard);\nrust/kernel/mem.rs-353-\n--\nrust/kernel/serdev.rs-15- },\nrust/kernel/serdev.rs:16: mem::DropGuard,\nrust/kernel/serdev.rs-17- new_mutex,\n--\nrust/kernel/serdev.rs=157= extern \"C\" fn probe_callback(sdev: *mut bindings::serdev_device) -\u003e kernel::ffi::c_int {\n--\nrust/kernel/serdev.rs-174- let private_data = unsafe { sdev.as_ref().drvdata_borrow::\u003cPrivateData\u003c'_, T\u003e\u003e() };\nrust/kernel/serdev.rs:175: let private_data = DropGuard::new(private_data, |_| {\nrust/kernel/serdev.rs-176- // SAFETY: We just set drvdata to `PrivateData\u003c'_, T\u003e`.\n--\nrust/kernel/serdev.rs-204- result.map(|()| {\nrust/kernel/serdev.rs:205: DropGuard::dismiss(private_data);\nrust/kernel/serdev.rs-206- 0\n--\nrust/kernel/sync/lock.rs-9-use crate::{\nrust/kernel/sync/lock.rs:10: mem::DropGuard,\nrust/kernel/sync/lock.rs-11- str::{CStr, CStrExt as _},\n--\nrust/kernel/sync/lock.rs=242= pub(crate) fn do_unlocked\u003cU\u003e(\u0026mut self, cb: impl FnOnce() -\u003e U) -\u003e U {\n--\nrust/kernel/sync/lock.rs-245-\nrust/kernel/sync/lock.rs:246: let _relock = DropGuard::new((), |_|\nrust/kernel/sync/lock.rs-247- // SAFETY: The lock was just unlocked above and is being relocked now.\n--\nrust/pin-init/src/__internal.rs=201= struct Foo {\n--\nrust/pin-init/src/__internal.rs-221-\nrust/pin-init/src/__internal.rs:222:// Marker types that determines type of `DropGuard`'s let bindings.\nrust/pin-init/src/__internal.rs-223-pub struct Pinned;\n--\nrust/pin-init/src/__internal.rs=244= pub unsafe fn new(ptr: *mut T) -\u003e Self {\n--\nrust/pin-init/src/__internal.rs-253- #[inline(always)]\nrust/pin-init/src/__internal.rs:254: pub fn write(self, value: T) -\u003e DropGuard\u003cP, T\u003e\nrust/pin-init/src/__internal.rs-255- where\n--\nrust/pin-init/src/__internal.rs-263- // - If `P` is `Pinned`, `self.ptr` is pinned.\nrust/pin-init/src/__internal.rs:264: unsafe { DropGuard::new(self.ptr) }\nrust/pin-init/src/__internal.rs-265- }\n--\nrust/pin-init/src/__internal.rs=268=impl\u003cT: ?Sized\u003e Slot\u003cUnpinned, T\u003e {\n--\nrust/pin-init/src/__internal.rs-270- #[inline(always)]\nrust/pin-init/src/__internal.rs:271: pub fn init\u003cE\u003e(self, init: impl Init\u003cT, E\u003e) -\u003e Result\u003cDropGuard\u003cUnpinned, T\u003e, E\u003e {\nrust/pin-init/src/__internal.rs-272- // SAFETY:\n--\nrust/pin-init/src/__internal.rs-280- // - `*self.ptr` is initialized above and the ownership is transferred to the guard.\nrust/pin-init/src/__internal.rs:281: Ok(unsafe { DropGuard::new(self.ptr) })\nrust/pin-init/src/__internal.rs-282- }\n--\nrust/pin-init/src/__internal.rs=285=impl\u003cT: ?Sized\u003e Slot\u003cPinned, T\u003e {\n--\nrust/pin-init/src/__internal.rs-287- #[inline(always)]\nrust/pin-init/src/__internal.rs:288: pub fn init\u003cE\u003e(self, init: impl PinInit\u003cT, E\u003e) -\u003e Result\u003cDropGuard\u003cPinned, T\u003e, E\u003e {\nrust/pin-init/src/__internal.rs-289- // SAFETY:\n--\nrust/pin-init/src/__internal.rs-298- // - `*self.ptr` is initialized above and the ownership is transferred to the guard.\nrust/pin-init/src/__internal.rs:299: Ok(unsafe { DropGuard::new(self.ptr) })\nrust/pin-init/src/__internal.rs-300- }\n--\nrust/pin-init/src/__internal.rs-311-/// - if `P` is `Pinned`, `ptr` is pinned.\nrust/pin-init/src/__internal.rs:312:pub struct DropGuard\u003cP, T: ?Sized\u003e {\nrust/pin-init/src/__internal.rs-313- ptr: *mut T,\n--\nrust/pin-init/src/__internal.rs-316-\nrust/pin-init/src/__internal.rs:317:impl\u003cP, T: ?Sized\u003e DropGuard\u003cP, T\u003e {\nrust/pin-init/src/__internal.rs-318- /// Creates a drop guard and transfer the ownership of the pointer content.\n--\nrust/pin-init/src/__internal.rs=328= pub unsafe fn new(ptr: *mut T) -\u003e Self {\n--\nrust/pin-init/src/__internal.rs-336-\nrust/pin-init/src/__internal.rs:337:impl\u003cT: ?Sized\u003e DropGuard\u003cUnpinned, T\u003e {\nrust/pin-init/src/__internal.rs-338- /// Create a let binding for accessor use.\n--\nrust/pin-init/src/__internal.rs=340= pub fn let_binding(\u0026mut self) -\u003e \u0026mut T {\n--\nrust/pin-init/src/__internal.rs-345-\nrust/pin-init/src/__internal.rs:346:impl\u003cT: ?Sized\u003e DropGuard\u003cPinned, T\u003e {\nrust/pin-init/src/__internal.rs-347- /// Create a let binding for accessor use.\n--\nrust/pin-init/src/__internal.rs=349= pub fn let_binding(\u0026mut self) -\u003e Pin\u003c\u0026mut T\u003e {\n--\nrust/pin-init/src/__internal.rs-355-\nrust/pin-init/src/__internal.rs:356:impl\u003cP, T: ?Sized\u003e Drop for DropGuard\u003cP, T\u003e {\nrust/pin-init/src/__internal.rs-357- #[inline]\n"
} |
| 45/2 | 2026/09/28 03:37 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 46032 output: 24 thoughts: 294 Thoughts: **Analyzing the Impact of `DropGuard` in the Rust Kernel** Okay, so I see `DropGuard` was introduced in `rust/kernel/mem.rs`. Interesting. And it looks like it's replaced `ScopeGuard` in a few places: `rust/kernel/block/mq/gen_disk.rs`, `rust/kernel/serdev.rs`, and `rust/kernel/sync/lock.rs`. Now, the key question for me is always reachability, particularly in a fuzzing context. Can fuzzing exercises this new code? Let's dive in. Focusing on `rust/kernel/sync/lock.rs`, I see that `Guard::do_unlocked` uses this `DropGuard`. Alright, where's `do_unlocked` called? Ah, `CondVar::wait_internal` in `rust/kernel/sync/condvar.rs`. And `CondVar` is used in… hold on a second… `drivers/android/binder`! Specifically, `self.work_condvar.wait_interruptible_freezable(&mut inner)` when waiting for work in a binder thread. The real question is: is `drivers/android/binder` fuzzed? Binder is a critical component in Android. And yeah, it is! Syzkaller has extensive fuzzing coverage for Binder IPC! I know this; I’ve seen the sys_ioctl_binder* descriptions. Wait... this kernel tree has `CONFIG_ANDROID_BINDER_IPC_RUST`?! This suggests a Rust implementation of Binder! Now I have to determine if this new rust-based binder code is in use and what other C code is present. This is a very interesting avenue to explore for potential vulnerabilities. |
| 46/2 | 2026/09/28 03:37 | tool | grepper |
0mError:no matches Args: {
"Expression": "CONFIG_ANDROID_BINDER_IPC\\b"
}Results: {
"error": "no matches"
} |
| 47/2 | 2026/09/28 03:37 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 46738 output: 28 thoughts: 17 Thoughts: Here's my thought process, as if I were considering this search: **Diving into the Android Kernel Driver Landscape** Okay, so I need to find something related to `ANDROID_BINDER`. My gut feeling is that it's going to be in the `drivers/android` directory. It’s pretty standard practice to compartmentalize Android-specific hardware and software interactions within that subtree. I mean, the name itself screams Android integration, so it's the logical starting point. I'm expecting to find either the core Binder driver implementation itself, or at least a header file defining related structures and functions. I might also find some platform-specific adaptations or extensions to the Binder framework within this area. It's a key part of the Android ecosystem, so the driver code should be interesting and critical to the kernel's interaction with the userspace. This search will be a good first step, at least. Let's see what turns up! |
| 48/2 | 2026/09/28 03:37 | tool | grepper |
0mArgs:{
"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_RUST\ndrivers/android/Kconfig-5-\tbool \"Android Binder IPC Driver\"\n--\ndrivers/android/Kconfig-17-\ndrivers/android/Kconfig:18:config ANDROID_BINDER_DEVICES\ndrivers/android/Kconfig-19-\tstring \"Android Binder devices\"\ndrivers/android/Kconfig:20:\tdepends on ANDROID_BINDER_IPC_RUST\ndrivers/android/Kconfig-21-\tdefault \"binder,hwbinder,vndbinder\"\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-$(CONFIG_ANDROID_BINDER_IPC_RUST)\t+= binder/\n--\ndrivers/android/binder/Makefile=2=ccflags-y += -I$(src)\t# needed for trace events\ndrivers/android/binder/Makefile-3-\ndrivers/android/binder/Makefile:4:obj-$(CONFIG_ANDROID_BINDER_IPC_RUST) += binder.o\ndrivers/android/binder/Makefile-5-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(devices, rust_binder_devices_param, charp, 0444);\n"
} |
| 49/2 | 2026/09/28 03:37 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 47432 output: 30 thoughts: 1132 Thoughts: **Analyzing Rust Binder and DropGuard Implementation** Okay, so I'm digging into this Rust-based Binder implementation, and the first thing that jumps out is that it's using a Rust Binder, potentially instead of or in addition to a C binder. Interesting... especially since I don't see C binder in `drivers/android` directly. So whenever we're dealing with `/dev/binder` (standard binder calls with `open`, `ioctl BINDER_WRITE_READ`), the thread is going to get stuck here: `self.work_condvar.wait_interruptible_freezable(&mut inner)`. That calls `CondVar::wait_internal`, which then calls `guard.do_unlocked(...)`, and *that* uses `DropGuard`! Okay, let's step back and consider other uses of `DropGuard`. Let me think… I should also look at `rnull` (Rust null block device): This can create a block device via configfs (`mkdir /sys/kernel/config/rnull/disk0`, etc.), which calls `GenDiskBuilder::build`. `GenDiskBuilder::build` uses DropGuard as well! Now I need to understand `DropGuard` itself, because it's clearly crucial. Let's look at the implementation in `rust/kernel/mem.rs`. I can see it's a wrapper around a value `inner` and a closure `f`, all using `ManuallyDrop` to manage the lifecycle. It appears to execute the closure `f` when it is dropped, and allows for the wrapped value to be accessed before the closure is called. The important methods are `new`, `dismiss`, and the `Drop` implementation. Hold on… does Rust code actually generate symbols in `vmlinux`? Yes, Rust functions, whether mangled or not, have symbols in `vmlinux`! Are these DropGuard methods inlined? The source shows `#[inline]` on `new`, `dismiss`, `deref`, `deref_mut`, and `drop`. That could be significant. In Rust, generic functions are *monomorphized* anyway, right? And when they're monomorphized *and* marked `#[inline]`, they could potentially be inlined into their callers. What are the callers of these `DropGuard` methods? Let's start by checking the *non-inline* or feature-specific caller functions. `do_unlocked` in `rust/kernel/sync/lock.rs` is interesting. It doesn't have an `#[inline]` attribute. What calls `do_unlocked`? It looks like `CondVar::wait_internal` in `rust/kernel/sync/condvar.rs`. And what calls `wait_internal`? `CondVar::wait`, `CondVar::wait_interruptible`, `CondVar::wait_interruptible_freezable`, and `CondVar::wait_interruptible_timeout`. Now, back to the Binder context. Specifically, in `drivers/android/binder`: where is `wait_interruptible_freezable` used? It's called in `drivers/android/binder/thread.rs`: within the Binder thread for both `get_work_local` and `get_work`! And what's the entrypoint to the work loop? It should be easy to see from `drivers/android/binder/thread.rs` |
| 50/2 | 2026/09/28 03:37 | tool | grepper |
0mArgs:{
"Expression": "fn get_work",
"PathPrefix": "drivers/android/binder/"
}Results: {
"Output": "drivers/android/binder/process.rs=599= pub(crate) fn debug_print(\u0026self, m: \u0026SeqFile, ctx: \u0026Context, print_all: bool) -\u003e Result {\n--\ndrivers/android/binder/process.rs-675- /// Attempts to fetch a work item from the process queue.\ndrivers/android/binder/process.rs:676: pub(crate) fn get_work(\u0026self) -\u003e Option\u003cDLArc\u003cdyn DeliverToRead\u003e\u003e {\ndrivers/android/binder/process.rs-677- self.inner.lock().work.pop_front()\n--\ndrivers/android/binder/process.rs-685- /// queue).\ndrivers/android/binder/process.rs:686: pub(crate) fn get_work_or_register\u003c'a\u003e(\ndrivers/android/binder/process.rs-687- \u0026'a self,\n--\ndrivers/android/binder/thread.rs=535= pub(crate) fn has_current_transaction(\u0026self) -\u003e bool {\n--\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 {\ndrivers/android/binder/thread.rs-546- {\n--\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 {\ndrivers/android/binder/thread.rs-587- let thread_has_deferred_work;\n"
} |
| 51/2 | 2026/09/28 03:37 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 49788 output: 30 thoughts: 159 Thoughts: **Binder Thread Investigation** Alright, let's dive in. I need to understand how these Binder threads are functioning. My initial focus is on the `drivers/android/binder/thread.rs` file. Immediately, I see something interesting: explicit symbol names! We've got `#[export_name = "rust_binder_waitlcl"]` and `#[export_name = "rust_binder_wait"]` on these `get_work_local` and `get_work` functions, respectively. That's a good starting point. Knowing the names of the functions, such as `rust_binder_wait` and `rust_binder_waitlcl`, is crucial for tracing execution. My next question: what's calling `get_work`? I need to trace the execution flow, and the most obvious place to start is within this `thread.rs` file. So, let's examine the `read` function and see how it interacts with `get_work`. That's where I'll find the connection. |
| 52/2 | 2026/09/28 03:37 | tool | grepper |
0mArgs:{
"Expression": "get_work\\(",
"PathPrefix": "drivers/android/binder/"
}Results: {
"Output": "drivers/android/binder/process.rs=599= pub(crate) fn debug_print(\u0026self, m: \u0026SeqFile, ctx: \u0026Context, print_all: bool) -\u003e Result {\n--\ndrivers/android/binder/process.rs-675- /// Attempts to fetch a work item from the process queue.\ndrivers/android/binder/process.rs:676: pub(crate) fn get_work(\u0026self) -\u003e Option\u003cDLArc\u003cdyn DeliverToRead\u003e\u003e {\ndrivers/android/binder/process.rs-677- self.inner.lock().work.pop_front()\n--\ndrivers/android/binder/process.rs=1411= fn deferred_release(self: Arc\u003cSelf\u003e) {\n--\ndrivers/android/binder/process.rs-1485- // Cancel all pending work items.\ndrivers/android/binder/process.rs:1486: while let Some(work) = self.get_work() {\ndrivers/android/binder/process.rs-1487- work.into_arc().cancel();\n--\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-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 {\ndrivers/android/binder/thread.rs-587- let thread_has_deferred_work;\n--\ndrivers/android/binder/thread.rs-606- drop(inner);\ndrivers/android/binder/thread.rs:607: return Ok(self.process.get_work());\ndrivers/android/binder/thread.rs-608- }\n--\ndrivers/android/binder/thread.rs-620- if !wait {\ndrivers/android/binder/thread.rs:621: return self.process.get_work().ok_or(EAGAIN).map(Some);\ndrivers/android/binder/thread.rs-622- }\n"
} |
| 53/2 | 2026/09/28 03:37 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 50763 output: 33 thoughts: 134 Thoughts: **Tracing the Thread and Block Device Initialization** Okay, let's break this down. My initial focus is on understanding the interaction between different parts of this system, specifically involving threading and block devices. I started by noting the functions `get_work_local` and `get_work` residing within `drivers/android/binder/thread.rs`. They're probably related to thread management in the Binder driver. My next line of investigation is towards `gen_disk.rs`. I need to figure out how blocks are managed, so this seems like a logical spot to check. Specifically, there's a function `pub fn build<T: Operations>(...)` defined in `rust/kernel/block/mq/gen_disk.rs`. Now, who actually *calls* this `build` function? That's the crucial link I need to establish. Looking at the codebase, it seems `NullBlkDevice::new` within `drivers/block/rnull/rnull.rs` is responsible for it. Now, how does that happen? I need to trace the call graph further. Time to pivot to `drivers/block/rnull/configfs.rs`, since this seems like the most likely entry point into `NullBlkDevice::new`. This should give me the full picture. |
| 54/2 | 2026/09/28 03:37 | tool | grepper |
0mArgs:{
"Expression": "NullBlkDevice::new",
"PathPrefix": "drivers/block/rnull/"
}Results: {
"Output": "drivers/block/rnull/configfs.rs=144= fn store(this: \u0026DeviceConfig, page: \u0026[u8]) -\u003e Result {\n--\ndrivers/block/rnull/configfs.rs-148- if !guard.powered \u0026\u0026 power_op {\ndrivers/block/rnull/configfs.rs:149: guard.disk = Some(NullBlkDevice::new(\ndrivers/block/rnull/configfs.rs-150- \u0026guard.name,\n"
} |
| 55/2 | 2026/09/28 03:37 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 51337 output: 29 thoughts: 1002 Thoughts: **Triage Assessment: Worth Fuzzing?** Okay, let's break this down. First, I noticed some interesting changes. The patch touches several areas, specifically `drivers/block/rnull/configfs.rs`, `rust/kernel/serdev.rs`, `rust/kernel/mem.rs`, `rust/kernel/sync/lock.rs`, and `rust/kernel/block/mq/gen_disk.rs`. `drivers/block/rnull/configfs.rs` piqued my interest because the `power` attribute triggers `NullBlkDevice::new(...)`, and `rust/kernel/serdev.rs` has a probe callback. Now, let's consult the triage guidelines. Reachability is key. Code has to actually *execute* in a standard virtualized environment to be worth fuzzing. The patch is doing a lot of refactoring and making "cleanups". I am not going to trust the "refactoring" claim and assume NFCI (no functional change). Any restructuring of data structures or algorithm flows gets my attention. The fact that the patch introduces `DropGuard` and uses `unsafe` blocks in `rust/kernel/mem.rs`, refactors core synchronization primitives like `do_unlocked` in `rust/kernel/sync/lock.rs` to use `DropGuard`, and modifies the block layer (`rust/kernel/block/mq/gen_disk.rs`) is screaming for more scrutiny. Crucially, the code *is* reachable: * Via Android Binder IPC (`CONFIG_ANDROID_BINDER_IPC_RUST`). Condition variables are using `do_unlocked` during `wait_interruptible_freezable` in standard binder ioctls (`BINDER_WRITE_READ`). This is a big one. * Via null block device (`CONFIG_BLK_DEV_RUST_NULL`). `GenDiskBuilder::build` is called during configfs device configuration. Given the touch points on core components and the established reachability through binder and the null block device configuration, it's pretty clear that this warrants fuzzing. My next step is to drill down on the symbols: what does the Rust emit? I'm checking for non-static and feature-specific symbols to see how they're exposed to syzkaller/kcov. I'm especially interested in symbols in `rust/kernel/sync/lock.rs`, `rust/kernel/sync/condvar.rs`, and `drivers/android/binder/`. Time to do a grep for `rust_binder_*`, `wait_internal`, `do_unlocked`, and `GenDiskBuilder` in the `drivers/android/binder` directory. This is definitely worth pursuing. |
| 56/2 | 2026/09/28 03:37 | tool | grepper |
0mArgs:{
"Expression": "export_name",
"PathPrefix": "drivers/android/binder/"
}Results: {
"Output": "drivers/android/binder/process.rs=1522= pub(crate) fn drop_outstanding_txn(\u0026self) {\n--\ndrivers/android/binder/process.rs-1537-\ndrivers/android/binder/process.rs:1538: // #[export_name] is a temporary workaround so that ps output does not become unreadable from\ndrivers/android/binder/process.rs-1539- // mangled symbol names.\ndrivers/android/binder/process.rs:1540: #[export_name = \"rust_binder_freeze\"]\ndrivers/android/binder/process.rs-1541- pub(crate) fn ioctl_freeze(\u0026self, info: \u0026BinderFreezeInfo) -\u003e Result {\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"
} |
| 57/2 | 2026/09/28 03:37 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 53508 output: 29 thoughts: 183 Thoughts: **Binder Wait Function Analysis** Okay, so I've been digging into the Binder code, specifically the Rust implementation, and I've noticed something interesting about how they're handling waiting. It's pretty smart, actually. I see that `rust_binder_wait`, `rust_binder_waitlcl`, and `rust_binder_freeze` all have these explicitly named exports – specifically *un-mangled* names – that are clearly designed for `wchan` and process status output. That's a classic trick for debugging and system-level introspection, and it's good to see they're doing that. And looking closer, all three of those functions are using conditional variable wait methods. Specifically: `rust_binder_freeze` is calling `freeze_wait.wait_interruptible_timeout(&mut inner, jiffies)`, while the other two, `rust_binder_waitlcl` and `rust_binder_wait`, both call `self.work_condvar.wait_interruptible_freezable(&mut inner)`. I'm starting to get a good sense of the locking and synchronization strategy here. But, wait... let's pause. What about `rust_binderfs` or other functions in the `drivers/android/binder` directory? I need to make sure I'm not missing anything crucial in the context. I'm going to quickly check `drivers/android/binder/rust_binder_main.rs` to see if there are any other wait operations or context-dependent code blocks I should be aware of. Gotta make sure I'm getting the full picture. |
| 58/2 | 2026/09/28 03:38 | tool | grepper |
0mArgs:{
"Expression": "fn binder_",
"PathPrefix": "drivers/android/binder/"
}Results: {
"Output": "drivers/android/binder/trace.rs-15-declare_trace! {\ndrivers/android/binder/trace.rs:16: unsafe fn binder_ioctl(cmd: c_uint, arg: c_ulong);\ndrivers/android/binder/trace.rs:17: unsafe fn binder_ioctl_done(ret: c_int);\ndrivers/android/binder/trace.rs:18: unsafe fn binder_read_done(ret: c_int);\ndrivers/android/binder/trace.rs:19: unsafe fn binder_write_done(ret: c_int);\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);\ndrivers/android/binder/trace.rs:24: unsafe fn binder_transaction_fd_recv(t_debug_id: c_int, fd: c_int, offset: usize);\ndrivers/android/binder/trace.rs:25: unsafe fn binder_command(cmd: u32);\ndrivers/android/binder/trace.rs:26: unsafe fn binder_return(ret: u32);\ndrivers/android/binder/trace.rs-27-}\n"
} |
| 59/2 | 2026/09/28 03:38 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 54486 output: 29 thoughts: 20 Thoughts: Here's my take on the file operations in `rust_binderfs.c`, or at least, where my head's at on it: **Diving into `rust_binderfs.c` - File Operations** Okay, so I need to understand the fundamental file operation implementations in this thing. Time to pull up `rust_binderfs.c` and start poking around. I'm going to focus on the core file operations – `open`, `read`, `write`, `close`, `ioctl`, the usual suspects. I want to see how this BinderFS abstraction layer interfaces with the underlying Binder driver or, more generally, whatever kernel components it relies on. I'm expecting to see a lot of translation happening here. We're probably taking a file handle from the VFS layer, doing some magic, and then handing it off (perhaps with some security checks, I'm hoping!) to the Binder infrastructure. I'll be looking for how the file descriptors are managed – are they being mapped to Binder references? Are we dealing with proxy objects at the file level? I'm hoping for well-defined structures that make the data flow clear. I want to know how the caching is handled if any is present. I'm particularly interested in any concurrency control and how it affects performance. I'm thinking about the implications for multiple client processes accessing the same Binder service through this filesystem interface, any potential bottlenecks, and how they’ve tackled them. I need to understand the synchronization primitives used to ensure data consistency in a multi-threaded or multi-process environment. I'll be looking for any hints of memory allocation and deallocation strategies since these are classic hot spots for performance or bugs. I'll be paying close attention to any error handling too. How are errors from the Binder driver, or the kernel in general, being mapped to file system error codes? Are they being translated meaningfully, or just blindly propagated? This is critical for debugging and robustness. I need to determine how the design caters to system calls from userspace. I'll be watching to see how this structure can be adapted by extending or augmenting the existing operations. |
| 60/2 | 2026/09/28 03:38 | tool | grepper |
0mArgs:{
"Expression": "file_operations",
"PathPrefix": "drivers/android/binder/"
}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 {\ndrivers/android/binder/rust_binder_main.rs-329- owner: this_module::\u003cLocalModule\u003e().as_ptr(),\n--\ndrivers/android/binder/rust_binderfs.c=356=static int binderfs_unlink(struct inode *dir, struct dentry *dentry)\n--\ndrivers/android/binder/rust_binderfs.c-363-\ndrivers/android/binder/rust_binderfs.c:364:static const struct file_operations binder_ctl_fops = {\ndrivers/android/binder/rust_binderfs.c-365-\t.owner\t\t= THIS_MODULE,\n--\ndrivers/android/binder/rust_binderfs.c=469=static struct dentry *rust_binderfs_create_file(struct dentry *parent, const char *name,\ndrivers/android/binder/rust_binderfs.c:470:\t\t\t\t\t\tconst struct file_operations *fops,\ndrivers/android/binder/rust_binderfs.c-471-\t\t\t\t\t\tvoid *data)\n"
} |
| 61/2 | 2026/09/28 03:38 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 55496 output: 41 thoughts: 53 Thoughts: Here's my analysis of the provided snippet. **Analyzing `rust_binder_fops` and Key Lines** Okay, so I'm diving into the `rust_binder_fops` structure within `drivers/android/binder/rust_binder_main.rs`. Seems like this is where the core file operations for the Rust-based Binder implementation are defined. I'm focusing on the code from lines 325 to 360, as indicated. This section likely contains the implementations for `open`, `release`, `mmap`, and other fundamental file operation handlers related to the Binder interface. I will be very interested to read the lines, as these lines will show how the Rust-based binder interacts with the underlying kernel infrastructure and deals with memory management, especially within the context of a potential IPC mechanism. I'll be looking for any hints on how they've handled potential security vulnerabilities in memory mapped files. |
| 62/2 | 2026/09/28 03:38 | tool | read-file |
0mArgs:{
"File": "drivers/android/binder/rust_binder_main.rs",
"FirstLine": 325,
"LineCount": 40
}Results: {
"Contents": " 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 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"
} |
| 63/2 | 2026/09/28 03:38 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 56473 output: 31 thoughts: 46 Thoughts: Here's my take on those thoughts: **Binder Kernel Interface Exploration** Okay, so I'm looking at these Rust Binder functions: `rust_binder_poll`, `rust_binder_ioctl`, `rust_binder_wait`, and `rust_binder_waitlcl`. My immediate inclination is to understand the context of `rust_binder_ioctl`— that's the one I want to dig into first. I know the Binder driver is heavily based on ioctls, so understanding that specific function will give me a good entry point. Let's see where that's defined; a trace through the code should be enlightening. |
| 64/2 | 2026/09/28 03:38 | tool | grepper |
0mArgs:{
"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"
} |
| 65/2 | 2026/09/28 03:38 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 56913 output: 41 thoughts: 53 Thoughts: Here's my summary, as if I were thinking it: **Investigating `rust_binder_ioctl`** Okay, so I've spotted `rust_binder_ioctl`, and it's flagged with `#[no_mangle]` or declared as an `unsafe extern "C"` function. Right away, this tells me it's critical, probably an entry point for kernel interaction or a low-level interface the compiler needs to handle differently. The use of `no_mangle` often means it's for external consumption, and `unsafe extern "C"` tells me we are going to be playing with C-level memory and potentially bypassing Rust's safety guarantees. Time to drill down. Let's see what's happening from lines 415 to 430 in `rust_binder_main.rs`. That's where the magic probably happens. I need to understand how this function is being called, what data it's receiving, and critically, what checks and validations are in place to prevent memory corruption or other security vulnerabilities. This is where I'll get a good grasp of the attack surface, and potential issues for the binder implementation. |
| 66/2 | 2026/09/28 03:39 | tool | read-file |
0mArgs:{
"File": "drivers/android/binder/rust_binder_main.rs",
"FirstLine": 415,
"LineCount": 25
}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 435:\t/// Only called by binderfs.\n 436:\tunsafe extern \"C\" fn rust_binder_mmap(\n 437:\t file: *mut bindings::file,\n 438:\t vma: *mut bindings::vm_area_struct,\n 439:\t) -\u003e kernel::ffi::c_int {\n"
} |
| 67/2 | 2026/09/28 03:39 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 57667 output: 37 thoughts: 344 Thoughts: **Analyzing Binder and rnull in the Kernel** Okay, let's break this down. My initial focus is on these `rust_binder_waitlcl` and `rust_binder_wait` functions. I see they're defined in `drivers/android/binder/thread.rs`. Interesting. They both ultimately rely on `wait_interruptible_freezable`, which in turn, goes down the rabbit hole to `CondVar::wait_internal`, then `Guard::do_unlocked`, and finally...a `DropGuard`. That's important. I immediately see this is all tied to a wait operation, likely inside the binder thread management. And `rust_binder_ioctl` is the entry point that kicks it off when the `BINDER_WRITE_READ` ioctl is executed. Good. Now, let's shift gears and consider `rnull`. I need to figure out how it's structured. I see `NullBlkDevice::new` calls `GenDiskBuilder::build` in `drivers/block/rnull/rnull.rs`. I need to check the exact function exports within this driver. Let's dig deeper into `drivers/block/rnull/rnull.rs` to get the specifics. |
| 68/2 | 2026/09/28 03:39 | tool | read-file |
0mArgs:{
"File": "drivers/block/rnull/rnull.rs",
"FirstLine": 1,
"LineCount": 45
}Results: {
"Contents": " 1:\t// SPDX-License-Identifier: GPL-2.0\n 2:\t\n 3:\t//! This is a Rust implementation of the C null block driver.\n 4:\t\n 5:\tmod configfs;\n 6:\t\n 7:\tuse configfs::IRQMode;\n 8:\tuse kernel::{\n 9:\t block::{\n 10:\t self,\n 11:\t mq::{\n 12:\t self,\n 13:\t gen_disk::{self, GenDisk},\n 14:\t Operations, TagSet,\n 15:\t },\n 16:\t },\n 17:\t prelude::*,\n 18:\t sync::{aref::ARef, Arc},\n 19:\t};\n 20:\t\n 21:\tmodule! {\n 22:\t type: NullBlkModule,\n 23:\t name: \"rnull_mod\",\n 24:\t authors: [\"Andreas Hindborg\"],\n 25:\t description: \"Rust implementation of the C null block driver\",\n 26:\t license: \"GPL v2\",\n 27:\t}\n 28:\t\n 29:\t#[pin_data]\n 30:\tstruct NullBlkModule {\n 31:\t #[pin]\n 32:\t configfs_subsystem: kernel::configfs::Subsystem\u003cconfigfs::Config\u003e,\n 33:\t}\n 34:\t\n 35:\timpl kernel::InPlaceModule for NullBlkModule {\n 36:\t fn init(_module: \u0026'static ThisModule) -\u003e impl PinInit\u003cSelf, Error\u003e {\n 37:\t pr_info!(\"Rust null_blk loaded\\n\");\n 38:\t\n 39:\t try_pin_init!(Self {\n 40:\t configfs_subsystem \u003c- configfs::subsystem(),\n 41:\t })\n 42:\t }\n 43:\t}\n 44:\t\n 45:\tstruct NullBlkDevice;\n"
} |
| 69/2 | 2026/09/28 03:39 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 58841 output: 40 thoughts: 40 Thoughts: Okay, here's my interpretation of what's going through my mind, delivered as a first-person summary, keeping in mind the audience is an expert: **Symbol Hunting in `gen_disk.rs`** Alright, let's dive in. My immediate focus is on that `rust/kernel/block/mq/gen_disk.rs` file. I need to get a handle on the symbols defined and used within it. The goal is to quickly understand the core elements and their relationships in this block device management context. My experience tells me this will be a foundational component. I'm implicitly looking for structures that represent the disk itself, maybe request queues, I/O path structures, and functions for initialization, access, or operations. I want to build a quick mental map of the key components. Let's start the analysis and see what we can find! |
| 70/2 | 2026/09/28 03:39 | tool | read-file |
0mArgs:{
"File": "rust/kernel/block/mq/gen_disk.rs",
"FirstLine": 90,
"LineCount": 40
}Results: {
"Contents": " 90:\t }\n 91:\t\n 92:\t /// Set the capacity of the device to be built, in sectors (512 bytes).\n 93:\t pub fn capacity_sectors(mut self, capacity: u64) -\u003e Self {\n 94:\t self.capacity_sectors = capacity;\n 95:\t self\n 96:\t }\n 97:\t\n 98:\t /// Build a new `GenDisk` and add it to the VFS.\n 99:\t pub fn build\u003cT: Operations\u003e(\n 100:\t self,\n 101:\t name: fmt::Arguments\u003c'_\u003e,\n 102:\t tagset: Arc\u003cTagSet\u003cT\u003e\u003e,\n 103:\t queue_data: T::QueueData,\n 104:\t ) -\u003e Result\u003cGenDisk\u003cT\u003e\u003e {\n 105:\t let data = queue_data.into_foreign();\n 106:\t let recover_data = DropGuard::new((), |_| {\n 107:\t // SAFETY: T::QueueData was created by the call to `into_foreign()` above\n 108:\t drop(unsafe { T::QueueData::from_foreign(data) });\n 109:\t });\n 110:\t\n 111:\t let mut lim: bindings::queue_limits = pin_init::zeroed();\n 112:\t\n 113:\t lim.logical_block_size = self.logical_block_size;\n 114:\t lim.physical_block_size = self.physical_block_size;\n 115:\t if self.rotational {\n 116:\t lim.features = bindings::BLK_FEAT_ROTATIONAL;\n 117:\t }\n 118:\t\n 119:\t // SAFETY: `tagset.raw_tag_set()` points to a valid and initialized tag set\n 120:\t let gendisk = from_err_ptr(unsafe {\n 121:\t bindings::__blk_mq_alloc_disk(\n 122:\t tagset.raw_tag_set(),\n 123:\t \u0026mut lim,\n 124:\t data,\n 125:\t static_lock_class!().as_ptr(),\n 126:\t )\n 127:\t })?;\n 128:\t\n 129:\t const TABLE: bindings::block_device_operations = bindings::block_device_operations {\n"
} |
| 71/2 | 2026/09/28 03:39 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 59754 output: 33 thoughts: 254 Thoughts: **Dissecting the Android BinderFS Integration** Okay, let's break this down. My initial thought process is centered around how this `build` method in `GenDiskBuilder` is being leveraged. I see it's a generic function, `pub fn build<T: Operations>(...)`, which is pretty standard. The key is where this is called. I'm focusing on the `drivers/block/rnull/configfs.rs` path, specifically how `store` is powering on the device and subsequently instantiating a `NullBlkDevice`. I see that `NullBlkDevice::new` then relies on `GenDiskBuilder::build`. But then, hold on, there's another thread, and it's from the kernel space! I'm noticing this interplay with `rust_binderfs.c`. I'm getting a picture of `binderfs_binder_device_create` establishing binder devices, which is fundamental. `binder_ctl_ioctl` seems to be responsible for the creation through `BINDER_CTL_ADD`, and `rust_binder_ioctl` appears to handle read/write operations with `BINDER_WRITE_READ` and so on. Now, a critical question arises: What Kconfig options are governing this entire integration? It's essential to understand the build environment to ensure everything's properly enabled. Let's delve into the Kconfigs. Firstly, `RUST` itself, that's obvious. Secondly, `ANDROID_BINDER_IPC_RUST` looks important, as it relies on `MMU`, `NET`, and `RUST`. But what about `ANDROID_BINDERFS`? Is it even defined? How is `rust_binderfs` brought into the compilation? I need to check if there is an option and determine its role. Let me now check `drivers/android/binder/Makefile` to gain more understanding, as it's the place that manages binder's driver's build. |
| 72/2 | 2026/09/28 03:39 | tool | read-file |
0mArgs:{
"File": "drivers/android/binder/Makefile",
"FirstLine": 1,
"LineCount": 30
}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) += binder.o\n 5:\tbinder-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"
} |
| 73/2 | 2026/09/28 03:39 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 60593 output: 39 thoughts: 1307 Thoughts: **Fuzzing Analysis: Rust Kernel Changes**
Okay, so I'm looking at this patch and figuring out if it needs fuzzing. First, `CONFIG_ANDROID_BINDER_IPC_RUST` compiles a bunch of Rust binder code, and `BLK_DEV_RUST_NULL` depends on Rust and configfs. But let's not get ahead of ourselves. Is this code worth the fuzzing effort?
I've got to follow the guidelines. This patch's goal is to discover crashes and latent bugs. If the code is reachable, modified, or refactored, it's a "yes" for fuzzing. Okay, let's break this down.
1. A new abstraction, `DropGuard`, with unsafe code, is introduced. This is a potential point of interest.
2. Crucially, it refactors `Guard::do_unlocked` which is used by `CondVar` which is used in `wait_internal` and `rust_binder_wait`. This is core, so definitely worth a look!
3. `GenDiskBuilder::build` in the block layer is refactored.
4. And there are reachable drivers:
* Binder IPC in Rust relies directly on the synchronization primitives (CondVar) - `rust_binder_wait`, `rust_binder_waitlcl`, `rust_binder_freeze`, and `rust_binder_ioctl` are critical here.
* Null block device uses `GenDiskBuilder::build`.
Therefore, based on those points, `WorthFuzzing` is definitively `true`. I mean, we're talking about core synchronization, block devices, and drivers - it's a no-brainer.
Now, let's get into the `FocusSymbols`. The goal is to find those functions that implement the logic being altered, or direct API entrypoints. We need to avoid ubiquitous lifecycle functions, like memory allocators, page fault handlers, etc. The coverage has to be focused.
Alright, let's look at the symbols in the kernel related to this. I've got:
* `rust_binder_ioctl`
* `rust_binder_wait`
* `rust_binder_waitlcl`
* `rust_binder_freeze`
Hold on, I need to verify that those functions even *exist* as symbols in vmlinux. Yes! `#[export_name = "rust_binder_wait"]`, etc. Those are good targets. Now, let's see if there are other C functions or exported functions in `drivers/android/binder`:
* `rust_binder_ioctl` (again, but in C)
* `rust_binderfs_create_file`
* `binderfs_binder_device_create`
* `binder_ctl_ioctl`
Okay, and for the null block device. Is there anything exported from `rnull`? Nope, nothing directly exported from `NullBlkDevice`. I need to think about configfs functions. Let's dig into `drivers/block/rnull/configfs.rs` around line 140 for that `store` definition.
|
| 74/2 | 2026/09/28 03:39 | tool | read-file |
0mArgs:{
"File": "drivers/block/rnull/configfs.rs",
"FirstLine": 140,
"LineCount": 40
}Results: {
"Contents": " 140:\t\n 141:\t Ok(writer.bytes_written())\n 142:\t }\n 143:\t\n 144:\t fn store(this: \u0026DeviceConfig, page: \u0026[u8]) -\u003e Result {\n 145:\t let power_op = kstrtobool_bytes(page)?;\n 146:\t let mut guard = this.data.lock();\n 147:\t\n 148:\t if !guard.powered \u0026\u0026 power_op {\n 149:\t guard.disk = Some(NullBlkDevice::new(\n 150:\t \u0026guard.name,\n 151:\t guard.block_size,\n 152:\t guard.rotational,\n 153:\t guard.capacity_mib,\n 154:\t guard.irq_mode,\n 155:\t )?);\n 156:\t guard.powered = true;\n 157:\t } else if guard.powered \u0026\u0026 !power_op {\n 158:\t drop(guard.disk.take());\n 159:\t guard.powered = false;\n 160:\t }\n 161:\t\n 162:\t Ok(())\n 163:\t }\n 164:\t}\n 165:\t\n 166:\t#[vtable]\n 167:\timpl configfs::AttributeOperations\u003c1\u003e for DeviceConfig {\n 168:\t type Data = DeviceConfig;\n 169:\t\n 170:\t fn show(this: \u0026DeviceConfig, page: \u0026mut [u8; PAGE_SIZE]) -\u003e Result\u003cusize\u003e {\n 171:\t let mut writer = kernel::str::Formatter::new(page);\n 172:\t writer.write_fmt(fmt!(\"{}\\n\", this.data.lock().block_size))?;\n 173:\t Ok(writer.bytes_written())\n 174:\t }\n 175:\t\n 176:\t fn store(this: \u0026DeviceConfig, page: \u0026[u8]) -\u003e Result {\n 177:\t if this.data.lock().powered {\n 178:\t return Err(EBUSY);\n 179:\t }\n"
} |
| 75/2 | 2026/09/28 03:39 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 63218 output: 280 thoughts: 920 Thoughts: **Analysis of the DropGuard RAII Implementation and its Impact** Okay, let's break this down. My initial observation is that `rust_binder_wait`, `rust_binder_waitlcl`, `rust_binder_freeze`, and `rust_binder_ioctl` are direct entry points. These functions are noteworthy because they directly utilize the modified `DropGuard` within `CondVar` waits through `Guard::do_unlocked`. Similarly, `binder_ctl_ioctl` is relevant as it handles the creation of binder devices. I need to make sure I don't miss anything obvious. So, what about `rust_drop_guard_kunit_test`? Ah, right, those are just KUnit tests, not syscall entry points. That’s a relief. Now, let's move to configuration options. I see `RUST`, `ANDROID_BINDER_IPC_RUST`, and `BLK_DEV_RUST_NULL`. I wonder if `ANDROID_BINDER_IPC_RUST` has any dependencies. Time to check `drivers/android/Kconfig`. Yes, it depends on `ANDROID_BINDER_IPC_RUST` and therefore, the devices as well. The Rust null block driver, `BLK_DEV_RUST_NULL`, depends on `RUST` and `CONFIGFS_FS`. Let's confirm that these are all relevant configs by listing them: `CONFIGFS_FS`, `RUST`, `ANDROID_BINDER_IPC_RUST`, `BLK_DEV_RUST_NULL`. Okay, let's verify these are good focus symbols: are `rust_binder_ioctl`, `rust_binder_wait`, `rust_binder_waitlcl`, `rust_binder_freeze`, `binder_ctl_ioctl` the right ones? Yes! Each of these functions has a direct connection to the introduced `DropGuard`. Specifically: - `rust_binder_wait` and `rust_binder_waitlcl`: They are specific functions that invoke `CondVar::wait_interruptible_freezable`, directly using `do_unlocked` where `DropGuard` replaced `ScopeGuard`. - `rust_binder_freeze`: This invokes `CondVar::wait_interruptible_timeout`, directly interacting with `do_unlocked` and `DropGuard`. - `rust_binder_ioctl`: This serves as the ioctl entry point for Rust binder, dispatching commands to `rust_binder_wait` and `rust_binder_freeze`. - `binder_ctl_ioctl`: It creates binderfs devices. Let's double-check all aspects to ensure nothing is missed: - Is this WorthFuzzing? Yes, absolutely. - What's the Reasoning? This patch introduces the `DropGuard` RAII type in `rust/kernel/mem.rs`, using `ManuallyDrop` and unsafe destruction. It refactors existing subsystems to use `DropGuard` instead of `ScopeGuard`. The core lock synchronization (`rust/kernel/sync/lock.rs` `do_unlocked`) is one. The block layer `GenDiskBuilder::build` for disk setup and error unwind cleanup is another. And then `rust/kernel/serdev.rs` probe callback. This modifies reachable executable kernel code and core synchronization primitives used in active drivers like Rust Binder and the Rust null block driver. - What are the FocusSymbols? `rust_binder_wait`, `rust_binder_waitlcl`, `rust_binder_freeze`, `rust_binder_ioctl`, `binder_ctl_ioctl` - What are the EnableConfigs? `RUST`, `ANDROID_BINDER_IPC_RUST`, `BLK_DEV_RUST_NULL`, and `CONFIGFS_FS` Alright, everything is looking solid. The code inspection supports the analysis. I'm satisfied. Time to set results. |
| 76/2 | 2026/09/28 03:39 | tool | set-results |
0mArgs:{
"EnableConfigs": [
"RUST",
"ANDROID_BINDER_IPC_RUST",
"BLK_DEV_RUST_NULL",
"CONFIGFS_FS"
],
"FocusSymbols": [
"rust_binder_wait",
"rust_binder_waitlcl",
"rust_binder_freeze",
"rust_binder_ioctl",
"binder_ctl_ioctl"
],
"Reasoning": "The patch introduces a new RAII abstraction DropGuard in rust/kernel/mem.rs (replacing ScopeGuard) and integrates it into core synchronization logic (rust/kernel/sync/lock.rs do_unlocked), block layer queue/disk initialization (rust/kernel/block/mq/gen_disk.rs GenDiskBuilder::build), and serdev. Guard::do_unlocked is used by CondVar to safely unlock and relock during thread sleep/wait, which is executed directly by the Rust Android Binder driver (CONFIG_ANDROID_BINDER_IPC_RUST) during ioctl work handling and thread wait loops. GenDiskBuilder::build is executed by the Rust null block driver (CONFIG_BLK_DEV_RUST_NULL). Fuzzing is warranted to verify invariants and uncover potential concurrency/memory-management regressions.",
"WorthFuzzing": true
}Results: {
"EnableConfigs": [
"RUST",
"ANDROID_BINDER_IPC_RUST",
"BLK_DEV_RUST_NULL",
"CONFIGFS_FS"
],
"FocusSymbols": [
"rust_binder_wait",
"rust_binder_waitlcl",
"rust_binder_freeze",
"rust_binder_ioctl",
"binder_ctl_ioctl"
],
"Reasoning": "The patch introduces a new RAII abstraction DropGuard in rust/kernel/mem.rs (replacing ScopeGuard) and integrates it into core synchronization logic (rust/kernel/sync/lock.rs do_unlocked), block layer queue/disk initialization (rust/kernel/block/mq/gen_disk.rs GenDiskBuilder::build), and serdev. Guard::do_unlocked is used by CondVar to safely unlock and relock during thread sleep/wait, which is executed directly by the Rust Android Binder driver (CONFIG_ANDROID_BINDER_IPC_RUST) during ioctl work handling and thread wait loops. GenDiskBuilder::build is executed by the Rust null block driver (CONFIG_BLK_DEV_RUST_NULL). Fuzzing is warranted to verify invariants and uncover potential concurrency/memory-management regressions.",
"WorthFuzzing": true
} |
| 77/1 | 2026/09/28 03:39 | action | If |
0mArgs:{
"WorthFuzzing": true
}Results: null |
| 78/2 | 2026/09/28 03:39 | agent | kmsan-evaluator |
0mModel:core Args: null Results: {
"KMSANReasoning": "The patch introduces `DropGuard` in `rust/kernel/mem.rs`, a RAII helper that wraps a value and executes a cleanup closure when dropped unless dismissed, and migrates existing usages from `ScopeGuard` to `DropGuard` in block MQ, serdev, and lock modules.\n\nThere are no uninitialized memory risks introduced:\n1. `DropGuard` wraps fully initialized values and closures via `ManuallyDrop`.\n2. No uninitialized memory, struct padding, or raw buffers are exposed or transferred across user/kernel boundaries.\n3. No bounds checks, length computations, or conditional branching based on uninitialized memory are modified.\n\nAny potential bugs resulting from drop-guard lifecycle issues (e.g., double free, use-after-free, or lock release bugs) are covered by KASAN, LOCKDEP, and standard kernel debugging facilities, not KMSAN. Therefore, a dedicated KMSAN fuzzing session is not warranted.",
"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 082e2ed8022f39496afa0ce36357b8aebdcbfbb4
Author: syz-cluster <triage@syzkaller.com>
Date: Mon Sep 28 03:35:24 2026 +0000
syz-cluster: applied patch under review
diff --git a/rust/kernel/Kconfig.test b/rust/kernel/Kconfig.test
index e6a5c7a795f0f..011c72f14e2cc 100644
--- a/rust/kernel/Kconfig.test
+++ b/rust/kernel/Kconfig.test
@@ -33,6 +33,16 @@ config RUST_KVEC_KUNIT_TEST
If unsure, say N.
+config RUST_DROP_GUARD_KUNIT_TEST
+ bool "KUnit tests for Rust DropGuard API" if !KUNIT_ALL_TESTS
+ default KUNIT_ALL_TESTS
+ help
+ This option enables KUnit tests for the Rust DropGuard API.
+ These are only for development and testing, not for regular
+ kernel use cases.
+
+ If unsure, say N.
+
config RUST_BITMAP_KUNIT_TEST
bool "KUnit tests for Rust bitmap API" if !KUNIT_ALL_TESTS
default KUNIT_ALL_TESTS
diff --git a/rust/kernel/block/mq/gen_disk.rs b/rust/kernel/block/mq/gen_disk.rs
index fc97dd8739746..d9019fbbb361a 100644
--- a/rust/kernel/block/mq/gen_disk.rs
+++ b/rust/kernel/block/mq/gen_disk.rs
@@ -10,11 +10,12 @@
block::mq::{Operations, TagSet},
error::{self, from_err_ptr, Result},
fmt::{self, Write},
+ mem::DropGuard,
prelude::*,
static_lock_class,
str::NullTerminatedFormatter,
sync::Arc,
- types::{ForeignOwnable, ScopeGuard},
+ types::ForeignOwnable,
};
/// A builder for [`GenDisk`].
@@ -102,7 +103,7 @@ pub fn build<T: Operations>(
queue_data: T::QueueData,
) -> Result<GenDisk<T>> {
let data = queue_data.into_foreign();
- let recover_data = ScopeGuard::new(|| {
+ let recover_data = DropGuard::new((), |_| {
// SAFETY: T::QueueData was created by the call to `into_foreign()` above
drop(unsafe { T::QueueData::from_foreign(data) });
});
@@ -150,7 +151,7 @@ pub fn build<T: Operations>(
// SAFETY: `gendisk` is a valid pointer as we initialized it above
unsafe { (*gendisk).fops = &TABLE };
- let cleanup_failure = ScopeGuard::new_with_data((gendisk, data), |(gendisk, data)| {
+ let cleanup_failure = DropGuard::new((gendisk, data), |(gendisk, data)| {
// SAFETY: `gendisk` came from `__blk_mq_alloc_disk()` above and
// has not been added to the VFS on this cleanup path.
unsafe { bindings::put_disk(gendisk) };
@@ -161,7 +162,7 @@ pub fn build<T: Operations>(
// The failure guard now owns both pieces of cleanup; the early guard
// must not run on this path anymore.
- recover_data.dismiss();
+ DropGuard::dismiss(recover_data);
let mut writer = NullTerminatedFormatter::new(
// SAFETY: `gendisk` points to a valid and initialized instance. We
@@ -185,7 +186,7 @@ pub fn build<T: Operations>(
},
)?;
- cleanup_failure.dismiss();
+ DropGuard::dismiss(cleanup_failure);
// INVARIANT: `gendisk` was initialized above.
// INVARIANT: `gendisk` was added to the VFS via `device_add_disk` above.
diff --git a/rust/kernel/mem.rs b/rust/kernel/mem.rs
index f2d4cdf87d00b..17807c8e67ac0 100644
--- a/rust/kernel/mem.rs
+++ b/rust/kernel/mem.rs
@@ -4,6 +4,95 @@
use crate::prelude::*;
+use core::{
+ mem::ManuallyDrop,
+ ops::{Deref, DerefMut},
+};
+
+/// Wraps a value and runs a closure when dropped.
+///
+/// This is useful for running cleanup code when leaving a scope.
+///
+/// The [`DropGuard::dismiss`] function can be used to take ownership of the wrapped
+/// value without running the cleanup function.
+#[doc(alias = "ScopeGuard")]
+#[doc(alias = "defer")]
+pub struct DropGuard<T, F>
+where
+ F: FnOnce(T),
+{
+ inner: ManuallyDrop<T>,
+ f: ManuallyDrop<F>,
+}
+
+impl<T, F> DropGuard<T, F>
+where
+ F: FnOnce(T),
+{
+ /// Creates a new `DropGuard`.
+ #[inline]
+ #[must_use]
+ pub fn new(inner: T, f: F) -> Self {
+ Self {
+ inner: ManuallyDrop::new(inner),
+ f: ManuallyDrop::new(f),
+ }
+ }
+
+ /// Consumes the `DropGuard`, returning the wrapped value without
+ /// running the cleanup function.
+ #[inline]
+ pub fn dismiss(guard: Self) -> T {
+ let mut guard = ManuallyDrop::new(guard);
+
+ // SAFETY: We have taken ownership of the guard and prevent its destructor from running.
+ let value = unsafe { ManuallyDrop::take(&mut guard.inner) };
+
+ // SAFETY: We have taken ownership of the guard.
+ unsafe { ManuallyDrop::drop(&mut guard.f) };
+
+ value
+ }
+}
+
+impl<T, F> Deref for DropGuard<T, F>
+where
+ F: FnOnce(T),
+{
+ type Target = T;
+
+ #[inline]
+ fn deref(&self) -> &T {
+ &self.inner
+ }
+}
+
+impl<T, F> DerefMut for DropGuard<T, F>
+where
+ F: FnOnce(T),
+{
+ #[inline]
+ fn deref_mut(&mut self) -> &mut T {
+ &mut self.inner
+ }
+}
+
+impl<T, F> Drop for DropGuard<T, F>
+where
+ F: FnOnce(T),
+{
+ #[inline]
+ fn drop(&mut self) {
+ // SAFETY: `DropGuard` is in the process of being dropped.
+ let inner = unsafe { ManuallyDrop::take(&mut self.inner) };
+
+ // SAFETY: `DropGuard` is in the process of being dropped.
+ let f = unsafe { ManuallyDrop::take(&mut self.f) };
+
+ f(inner);
+ }
+}
+
/// Transmute between two types.
///
/// Use this instead of [`core::mem::transmute`] when it is known that sizes are identical but this
@@ -232,3 +321,37 @@ unsafe impl AsReprMut for $signed {}
// `usize` is not normalized to particular integer for portability.
usize isize,
}
+
+#[cfg(CONFIG_RUST_DROP_GUARD_KUNIT_TEST)]
+#[macros::kunit_tests(rust_drop_guard)]
+mod tests {
+ use super::*;
+
+ #[test]
+ fn test_drop_runs_cleanup() {
+ let mut cleaned = false;
+
+ {
+ let _guard = DropGuard::new(42, |value| {
+ assert_eq!(value, 42);
+ cleaned = true;
+ });
+ }
+
+ assert!(cleaned);
+ }
+
+ #[test]
+ fn test_dismiss_returns_value_without_cleanup() {
+ let mut cleaned = false;
+
+ let guard = DropGuard::new(42, |_| {
+ cleaned = true;
+ });
+
+ let value = DropGuard::dismiss(guard);
+
+ assert_eq!(value, 42);
+ assert!(!cleaned);
+ }
+}
diff --git a/rust/kernel/serdev.rs b/rust/kernel/serdev.rs
index 17ca504b7f8d6..dd43b159b4616 100644
--- a/rust/kernel/serdev.rs
+++ b/rust/kernel/serdev.rs
@@ -13,6 +13,7 @@
to_result,
VTABLE_DEFAULT_ERROR, //
},
+ mem::DropGuard,
new_mutex,
of,
prelude::*,
@@ -21,10 +22,7 @@
Mutex, //
},
time::Jiffies,
- types::{
- Opaque,
- ScopeGuard, //
- }, //
+ types::Opaque, //
};
use core::{
@@ -174,7 +172,7 @@ extern "C" fn probe_callback(sdev: *mut bindings::serdev_device) -> kernel::ffi:
}))?;
// SAFETY: We just set drvdata to `PrivateData<'_, T>`.
let private_data = unsafe { sdev.as_ref().drvdata_borrow::<PrivateData<'_, T>>() };
- let private_data = ScopeGuard::new_with_data(private_data, |_| {
+ let private_data = DropGuard::new(private_data, |_| {
// SAFETY: We just set drvdata to `PrivateData<'_, T>`.
drop(unsafe { sdev.as_ref().drvdata_obtain::<PrivateData<'_, T>>() });
});
@@ -204,7 +202,7 @@ extern "C" fn probe_callback(sdev: *mut bindings::serdev_device) -> kernel::ffi:
drop(active);
result.map(|()| {
- private_data.dismiss();
+ DropGuard::dismiss(private_data);
0
})
})
diff --git a/rust/kernel/sync/lock.rs b/rust/kernel/sync/lock.rs
index 10b6b5e9b024f..15f9cbe76c8d9 100644
--- a/rust/kernel/sync/lock.rs
+++ b/rust/kernel/sync/lock.rs
@@ -7,8 +7,9 @@
use super::LockClassKey;
use crate::{
+ mem::DropGuard,
str::{CStr, CStrExt as _},
- types::{NotThreadSafe, Opaque, ScopeGuard},
+ types::{NotThreadSafe, Opaque},
};
use core::{cell::UnsafeCell, marker::PhantomPinned, pin::Pin};
use pin_init::{pin_data, pin_init, PinInit, Wrapper};
@@ -242,7 +243,7 @@ pub(crate) fn do_unlocked<U>(&mut self, cb: impl FnOnce() -> U) -> U {
// SAFETY: The caller owns the lock, so it is safe to unlock it.
unsafe { B::unlock(self.lock.state.get(), &self.state) };
- let _relock = ScopeGuard::new(||
+ let _relock = DropGuard::new((), |_|
// SAFETY: The lock was just unlocked above and is being relocked now.
unsafe { B::relock(self.lock.state.get(), &mut self.state) });
|
| 79/3 | 2026/09/28 03:39 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 4860 output: 24 thoughts: 261 Thoughts: **Analyzing the Patch: DropGuard and KMSAN Implications** Okay, let's dive into this patch. My immediate goal is to understand if this change necessitates any KMSAN considerations. First, I need to understand exactly what's being introduced and modified. I'm seeing a diff that touches a few key files. First, there's a new Kconfig entry, `RUST_DROP_GUARD_KUNIT_TEST`. That's a good starting point, but not immediately alarming, just a test configuration option. The core of the change seems to be in `rust/kernel/mem.rs`. I'm seeing the introduction of a `DropGuard<T, F>` struct. It looks like it implements a deferred drop mechanism using `ManuallyDrop`. Interesting. The `DropGuard` struct holds the value and the destructor function, and provides methods like `new`, `dismiss`, `deref`, `deref_mut`, and, of course, `drop`. Looks like there are KUnit tests included too. The real meat of this change, however, is the replacement of `ScopeGuard` with `DropGuard` in a few key locations: `gen_disk.rs`, `serdev.rs`, and `lock.rs`. This warrants further investigation. I'm now curious about the nature of `ScopeGuard` itself. Is it being deleted, deprecated, or simply superseded? I'm going to do a quick `grep` for `ScopeGuard` to see where it was used and understand its function. This will give me a better understanding of the change's impact and if it introduces any new potential memory safety pitfalls I need to be aware of from a KMSAN perspective. |
| 80/3 | 2026/09/28 03:39 | tool | grepper |
0mArgs:{
"Expression": "ScopeGuard",
"PathPrefix": "rust/"
}Results: {
"Output": "rust/kernel/mem.rs-17-/// value without running the cleanup function.\nrust/kernel/mem.rs:18:#[doc(alias = \"ScopeGuard\")]\nrust/kernel/mem.rs-19-#[doc(alias = \"defer\")]\n--\nrust/kernel/types.rs=152= unsafe fn borrow_mut\u003c'a\u003e(_: *mut c_void) -\u003e Self::BorrowedMut\u003c'a\u003e {}\n--\nrust/kernel/types.rs-156-///\nrust/kernel/types.rs:157:/// The [`ScopeGuard::dismiss`] function prevents the cleanup function from running.\nrust/kernel/types.rs-158-///\n--\nrust/kernel/types.rs-164-/// ```\nrust/kernel/types.rs:165:/// # use kernel::types::ScopeGuard;\nrust/kernel/types.rs-166-/// fn example1(arg: bool) {\nrust/kernel/types.rs:167:/// let _log = ScopeGuard::new(|| pr_info!(\"example1 completed\\n\"));\nrust/kernel/types.rs-168-///\n--\nrust/kernel/types.rs-183-/// ```\nrust/kernel/types.rs:184:/// # use kernel::types::ScopeGuard;\nrust/kernel/types.rs-185-/// fn example2(arg: bool) {\nrust/kernel/types.rs:186:/// let log = ScopeGuard::new(|| pr_info!(\"example2 returned early\\n\"));\nrust/kernel/types.rs-187-///\n--\nrust/kernel/types.rs-202-/// In the example below, we need a mutable object (the vector) to be accessible within the log\nrust/kernel/types.rs:203:/// function, so we wrap it in the [`ScopeGuard`]:\nrust/kernel/types.rs-204-///\nrust/kernel/types.rs-205-/// ```\nrust/kernel/types.rs:206:/// # use kernel::types::ScopeGuard;\nrust/kernel/types.rs-207-/// fn example3(arg: bool) -\u003e Result {\nrust/kernel/types.rs-208-/// let mut vec =\nrust/kernel/types.rs:209:/// ScopeGuard::new_with_data(KVec::new(), |v| pr_info!(\"vec had {} elements\\n\", v.len()));\nrust/kernel/types.rs-210-///\n--\nrust/kernel/types.rs-225-/// The value stored in the struct is nearly always `Some(_)`, except between\nrust/kernel/types.rs:226:/// [`ScopeGuard::dismiss`] and [`ScopeGuard::drop`]: in this case, it will be `None` as the value\nrust/kernel/types.rs:227:/// will have been returned to the caller. Since [`ScopeGuard::dismiss`] consumes the guard,\nrust/kernel/types.rs-228-/// callers won't be able to use it anymore.\nrust/kernel/types.rs:229:pub struct ScopeGuard\u003cT, F: FnOnce(T)\u003e(Option\u003c(T, F)\u003e);\nrust/kernel/types.rs-230-\nrust/kernel/types.rs:231:impl\u003cT, F: FnOnce(T)\u003e ScopeGuard\u003cT, F\u003e {\nrust/kernel/types.rs-232- /// Creates a new guarded object wrapping the given data and with the given cleanup function.\n--\nrust/kernel/types.rs=239= pub fn dismiss(mut self) -\u003e T {\n--\nrust/kernel/types.rs-245-\nrust/kernel/types.rs:246:impl ScopeGuard\u003c(), fn(())\u003e {\nrust/kernel/types.rs-247- /// Creates a new guarded object with the given cleanup function.\nrust/kernel/types.rs:248: pub fn new(cleanup: impl FnOnce()) -\u003e ScopeGuard\u003c(), impl FnOnce(())\u003e {\nrust/kernel/types.rs:249: ScopeGuard::new_with_data((), move |()| cleanup())\nrust/kernel/types.rs-250- }\n--\nrust/kernel/types.rs-252-\nrust/kernel/types.rs:253:impl\u003cT, F: FnOnce(T)\u003e Deref for ScopeGuard\u003cT, F\u003e {\nrust/kernel/types.rs-254- type Target = T;\n--\nrust/kernel/types.rs=256= fn deref(\u0026self) -\u003e \u0026T {\n--\nrust/kernel/types.rs-261-\nrust/kernel/types.rs:262:impl\u003cT, F: FnOnce(T)\u003e DerefMut for ScopeGuard\u003cT, F\u003e {\nrust/kernel/types.rs-263- fn deref_mut(\u0026mut self) -\u003e \u0026mut T {\n--\nrust/kernel/types.rs-268-\nrust/kernel/types.rs:269:impl\u003cT, F: FnOnce(T)\u003e Drop for ScopeGuard\u003cT, F\u003e {\nrust/kernel/types.rs-270- fn drop(\u0026mut self) {\n"
} |
| 81/3 | 2026/09/28 03:39 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 6760 output: 224 thoughts: 1225 Thoughts: **Reasoning About KMSAN Needs for a Drop Guard Abstraction** Alright, let's break this down systematically. I'm examining a patch that introduces `DropGuard`, a RAII-style wrapper in the Rust kernel code, designed to handle cleanup logic, essentially replacing uses of `ScopeGuard` in several modules: `block/mq/gen_disk.rs`, `serdev.rs`, and `sync/lock.rs`. The goal is to determine if this change necessitates enabling KMSAN. My initial thought is to scrutinize `DropGuard`'s implementation, starting with its core components. `DropGuard` cleverly uses `ManuallyDrop<T>` and `ManuallyDrop<F>` to manage the wrapped data (`inner`) and the cleanup function (`f`). This design avoids the overhead of `Option` and its discriminant. I'm taking a close look at how these `ManuallyDrop` wrappers are used in `new`, `dismiss`, `Deref`/`DerefMut`, and the `Drop` implementation to understand the memory lifecycle of `inner` and `f`. Specifically, the critical parts are where the wrapped `inner` and `f` are "taken" using `ManuallyDrop::take` and how `f` is eventually called with `inner`. The key here is that both are fully initialized at the time of wrapping and the unwrapping. Now, let's address the KMSAN question head-on. KMSAN is primarily concerned with detecting reads of uninitialized memory and potential kernel-to-user memory leaks. According to the prompt, I need to evaluate if the patch introduces risks of uninitialized memory access. I'm going through the rules: 1. Kernel structures sent to user space (via `copy_to_user`, etc.): Not relevant here. 2. Conditional logic depending on potentially uninitialized variables: Not in the patch. 3. Allocation of complex data structures with uninitialized fields: Doesn't apply, as the patch focuses on existing, initialized data. 4. Bounds checks that allow access to uninitialized bytes of existing buffers: Not relevant. The core of my analysis reveals that `DropGuard` *always* wraps initialized `inner` and `f`. The patch doesn't involve any uninitialized memory allocations, zeroed buffers, data copied to userspace, or modifications to buffer lengths. Critically, there's no way the `DropGuard` could lead to reading uninitialized data. So, where could potential bugs reside? Primarily within the `DropGuard` itself: perhaps double drops, use-after-free scenarios if the cleanup logic is incorrect, or logic errors during cleanup. However, these issues would manifest as use-after-free, double free, or deadlock/locking bugs—exactly the kind of errors that KASAN and standard error detectors are designed to catch. Therefore, because this patch doesn't introduce any new risks specifically detectable by KMSAN, my conclusion is that `NeedsKMSAN` should be `false`. The reasoning is clear: * The patch introduces `DropGuard` as a RAII wrapper for cleanup. * KMSAN is not applicable because all data wrapped by `DropGuard` is fully initialized, and no kernel-to-user data copying is involved. * KASAN and other tools are sufficient because potential bugs related to cleanup or memory management are detected by KASAN. Let's call `set-results`. |
| 82/3 | 2026/09/28 03:39 | tool | set-results |
0mArgs:{
"KMSANReasoning": "The patch introduces `DropGuard` in `rust/kernel/mem.rs`, a RAII helper that wraps a value and executes a cleanup closure when dropped unless dismissed, and migrates existing usages from `ScopeGuard` to `DropGuard` in block MQ, serdev, and lock modules.\n\nThere are no uninitialized memory risks introduced:\n1. `DropGuard` wraps fully initialized values and closures via `ManuallyDrop`.\n2. No uninitialized memory, struct padding, or raw buffers are exposed or transferred across user/kernel boundaries.\n3. No bounds checks, length computations, or conditional branching based on uninitialized memory are modified.\n\nAny potential bugs resulting from drop-guard lifecycle issues (e.g., double free, use-after-free, or lock release bugs) are covered by KASAN, LOCKDEP, and standard kernel debugging facilities, not KMSAN. Therefore, a dedicated KMSAN fuzzing session is not warranted.",
"NeedsKMSAN": false
}Results: {
"KMSANReasoning": "The patch introduces `DropGuard` in `rust/kernel/mem.rs`, a RAII helper that wraps a value and executes a cleanup closure when dropped unless dismissed, and migrates existing usages from `ScopeGuard` to `DropGuard` in block MQ, serdev, and lock modules.\n\nThere are no uninitialized memory risks introduced:\n1. `DropGuard` wraps fully initialized values and closures via `ManuallyDrop`.\n2. No uninitialized memory, struct padding, or raw buffers are exposed or transferred across user/kernel boundaries.\n3. No bounds checks, length computations, or conditional branching based on uninitialized memory are modified.\n\nAny potential bugs resulting from drop-guard lifecycle issues (e.g., double free, use-after-free, or lock release bugs) are covered by KASAN, LOCKDEP, and standard kernel debugging facilities, not KMSAN. Therefore, a dedicated KMSAN fuzzing session is not warranted.",
"NeedsKMSAN": false
} |
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