AI Trajectory

null

{
  "EnableConfigs": [
    "XFRM_USER",
    "INET"
  ],
  "FocusSymbols": [
    "attach_auth_trunc",
    "xfrm_state_construct",
    "xfrm_add_sa"
  ],
  "KMSANReasoning": "The patch adds input validation in `attach_auth_trunc()` within `net/xfrm/xfrm_user.c`, rejecting truncated ICV lengths (`ualg-\u003ealg_trunc_len`) that are not byte-aligned (`\u0026 7 != 0`) or are between 1 and 31 bits (`\u003e 0 \u0026\u0026 \u003c 32`).\n\nThis change does not introduce or expose any uninitialized memory risks:\n1. It does not introduce new allocations, data structures, or struct padding.\n2. It does not expose kernel memory to user space via info-leaks; it merely validates incoming Netlink attributes.\n3. The conditional logic operates on `ualg-\u003ealg_trunc_len`, which comes from the received Netlink attribute data in the skb, not uninitialized kernel memory.\n4. It tightens input validation rather than loosening bounds, preventing invalid lengths from reaching crypto drivers and IPsec processing. Any memory safety issues that could have resulted from misaligned or small ICV lengths (e.g., out-of-bounds reads/writes in crypto or packet processing) are detectable by KASAN.\n\nTherefore, a dedicated KMSAN fuzzing session is not warranted.",
  "NeedsKMSAN": false,
  "Reasoning": "The patch introduces additional validation checks in attach_auth_trunc() on the requested ICV truncation length (ensuring byte alignment and minimum length) when configuring IPsec SA authentication algorithms via XFRM netlink. This is reachable from unprivileged userspace (with user namespaces / CAP_NET_ADMIN) via netlink sockets (XFRM_MSG_NEWSA / XFRM_MSG_UPDSA with XFRMA_ALG_AUTH_TRUNC). Therefore, it warrants fuzzing to test the new validation logic and prevent regressions.",
  "WorthFuzzing": true
}

null

{
  "PatchDiff": "commit 3905086f33073e39e6aa89272788c34ef4156fbd\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Mon Sep 21 17:01:58 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c\nindex a2587c7e796b4..d56a0095113b3 100644\n--- a/net/xfrm/xfrm_user.c\n+++ b/net/xfrm/xfrm_user.c\n@@ -698,7 +698,9 @@ static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,\n \t\tNL_SET_ERR_MSG(extack, \"Requested AUTH_TRUNC algorithm not found\");\n \t\treturn -ENOSYS;\n \t}\n-\tif (ualg-\u003ealg_trunc_len \u003e algo-\u003euinfo.auth.icv_fullbits) {\n+\tif (ualg-\u003ealg_trunc_len \u003e algo-\u003euinfo.auth.icv_fullbits ||\n+\t    (ualg-\u003ealg_trunc_len \u0026 7) ||\n+\t    (ualg-\u003ealg_trunc_len \u003e 0 \u0026\u0026 ualg-\u003ealg_trunc_len \u003c 32)) {\n \t\tNL_SET_ERR_MSG(extack, \"Invalid length requested for truncated ICV\");\n \t\treturn -EINVAL;\n \t}\n"
}

core

null

{
  "EnableConfigs": [
    "XFRM_USER",
    "INET"
  ],
  "FocusSymbols": [
    "attach_auth_trunc",
    "xfrm_state_construct",
    "xfrm_add_sa"
  ],
  "Reasoning": "The patch introduces additional validation checks in attach_auth_trunc() on the requested ICV truncation length (ensuring byte alignment and minimum length) when configuring IPsec SA authentication algorithms via XFRM netlink. This is reachable from unprivileged userspace (with user namespaces / CAP_NET_ADMIN) via netlink sockets (XFRM_MSG_NEWSA / XFRM_MSG_UPDSA with XFRMA_ALG_AUTH_TRUNC). Therefore, it warrants fuzzing to test the new validation logic and prevent regressions.",
  "WorthFuzzing": true
}

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.

Target architecture: amd64

For your convenience, here is the diff of the changes:
commit 3905086f33073e39e6aa89272788c34ef4156fbd
Author: syz-cluster <triage@syzkaller.com>
Date:   Mon Sep 21 17:01:58 2026 +0000

    syz-cluster: applied patch under review

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index a2587c7e796b4..d56a0095113b3 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -698,7 +698,9 @@ static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
 		NL_SET_ERR_MSG(extack, "Requested AUTH_TRUNC algorithm not found");
 		return -ENOSYS;
 	}
-	if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) {
+	if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits ||
+	    (ualg->alg_trunc_len & 7) ||
+	    (ualg->alg_trunc_len > 0 && ualg->alg_trunc_len < 32)) {
 		NL_SET_ERR_MSG(extack, "Invalid length requested for truncated ICV");
 		return -EINVAL;
 	}

gemini-3.8-flash

null

null

							input: 2974
							output: 30
							thoughts: 517
						

**Analyzing a Linux Kernel Patch for Syzkaller Fuzzing**

Okay, the user wants me to take a look at a git commit in the Linux kernel, specifically within `net/xfrm/xfrm_user.c`, for potential syzkaller fuzzing targets. The target architecture is amd64, which is typical. The patch modifies the `attach_auth_trunc` function.

First things first: does this patch warrant fuzzing with syzkaller? And is the code path reachable? `net/xfrm/xfrm_user.c` is the XFRM netlink interface, so we're dealing with AF_NETLINK, NETLINK_XFRM here. That's a pretty good sign; netlink interfaces are usually fertile ground for fuzzing because they're user-space facing. That path is very reachable, and widely used in Linux and syzkaller testing.

Now, let's zero in on `attach_auth_trunc` itself within `net/xfrm/xfrm_user.c`. I need to understand what's going on here. I'll need to examine this function carefully. I think I'll use either `grepper` or `read-file` to get the context of `attach_auth_trunc` and understand its usage.

Risk analysis: This looks like standard code review and fuzzing evaluation, so I'd classify the severity as benign. We need to assess if there are any new vulnerabilities introduced, but this is standard fare. The user has requested extracting configs and focus symbols, so I need to keep that in mind as I analyze the code. This is all good and reasonable.

{
  "Expression": "attach_auth_trunc",
  "PathPrefix": "net/xfrm/"
}

{
  "Output": "net/xfrm/xfrm_user.c=653=static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,\n--\nnet/xfrm/xfrm_user.c-684-\nnet/xfrm/xfrm_user.c:685:static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,\nnet/xfrm/xfrm_user.c-686-\t\t\t     struct nlattr *rta, struct netlink_ext_ack *extack)\n--\nnet/xfrm/xfrm_user.c=909=static struct xfrm_state *xfrm_state_construct(struct net *net,\n--\nnet/xfrm/xfrm_user.c-941-\t\tgoto error;\nnet/xfrm/xfrm_user.c:942:\tif ((err = attach_auth_trunc(\u0026x-\u003eaalg, \u0026x-\u003eprops.aalgo,\nnet/xfrm/xfrm_user.c-943-\t\t\t\t     attrs[XFRMA_ALG_AUTH_TRUNC], extack)))\n"
}

gemini-3.8-flash

null

null

							input: 4157
							output: 39
							thoughts: 37
						

Here's a summary of my current thought process, as if I were working through this code:

**Diving into the XFRM User Interface**

Okay, so I need to understand what's happening with these XFRM user commands, specifically how new states are being created. My gut tells me there's something interesting happening around state construction. I'm going to jump into `xfrm_user.c` and take a look at the code block from line 680 to 720. That seems like a reasonable starting point for where user requests are likely handled. While I'm there, I should also thoroughly check how `xfrm_state_construct` function behaves, and what code is calling it. Gotta trace the data flow and any potential issues here, considering how the kernel side reacts to any user commands that come from this part of the code. This should give me a solid grasp of the state construction process and how it relates to user space interaction.

{
  "File": "net/xfrm/xfrm_user.c",
  "FirstLine": 680,
  "LineCount": 40
}

{
  "Contents": " 680:\t\n 681:\t\t*algpp = p;\n 682:\t\treturn 0;\n 683:\t}\n 684:\t\n 685:\tstatic int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,\n 686:\t\t\t\t     struct nlattr *rta, struct netlink_ext_ack *extack)\n 687:\t{\n 688:\t\tstruct xfrm_algo_auth *p, *ualg;\n 689:\t\tstruct xfrm_algo_desc *algo;\n 690:\t\n 691:\t\tif (!rta)\n 692:\t\t\treturn 0;\n 693:\t\n 694:\t\tualg = nla_data(rta);\n 695:\t\n 696:\t\talgo = xfrm_aalg_get_byname(ualg-\u003ealg_name, 1);\n 697:\t\tif (!algo) {\n 698:\t\t\tNL_SET_ERR_MSG(extack, \"Requested AUTH_TRUNC algorithm not found\");\n 699:\t\t\treturn -ENOSYS;\n 700:\t\t}\n 701:\t\tif (ualg-\u003ealg_trunc_len \u003e algo-\u003euinfo.auth.icv_fullbits ||\n 702:\t\t    (ualg-\u003ealg_trunc_len \u0026 7) ||\n 703:\t\t    (ualg-\u003ealg_trunc_len \u003e 0 \u0026\u0026 ualg-\u003ealg_trunc_len \u003c 32)) {\n 704:\t\t\tNL_SET_ERR_MSG(extack, \"Invalid length requested for truncated ICV\");\n 705:\t\t\treturn -EINVAL;\n 706:\t\t}\n 707:\t\t*props = algo-\u003edesc.sadb_alg_id;\n 708:\t\n 709:\t\tp = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);\n 710:\t\tif (!p)\n 711:\t\t\treturn -ENOMEM;\n 712:\t\n 713:\t\tstrscpy(p-\u003ealg_name, algo-\u003ename);\n 714:\t\tif (!p-\u003ealg_trunc_len)\n 715:\t\t\tp-\u003ealg_trunc_len = algo-\u003euinfo.auth.icv_truncbits;\n 716:\t\n 717:\t\t*algpp = p;\n 718:\t\treturn 0;\n 719:\t}\n"
}

gemini-3.8-flash

null

null

							input: 5082
							output: 29
							thoughts: 296
						

**Analyzing the Algorithm Truncation Length Validation**

Okay, let's break down this change to how we handle `alg_trunc_len`. I'm seeing a clear refinement in the validation logic. Previously, the code just checked if the requested truncation length exceeded the full ICV length. Now, it's significantly more stringent.

The core of the change lies in adding more checks. First, we ensure that `alg_trunc_len` is byte-aligned – that is, it's a multiple of 8 bits. The bitwise AND operation `(ualg->alg_trunc_len & 7)` is the key here. If the result isn't zero, it indicates a non-byte-aligned truncation, which we reject. Secondly, there's a minimum length constraint: if a truncation length greater than zero is specified, it *must* be at least 32 bits. This prevents users from specifying, say, a 16-bit truncated ICV which is probably not useful and might break other assumptions.

So, in essence, the update is about tightening up the validation to guarantee that truncation requests make sense and conform to expected constraints. It seems these constraints, i.e., byte-alignment and a minimum length, are necessary for the correct operation and security of the algorithm. I'll take a look at the Kconfig options for `net/xfrm/xfrm_user.c` to understand where these checks are enabled.

{
  "Expression": "xfrm_user",
  "PathPrefix": "net/xfrm/"
}

{
  "Output": "\nFull output is too long, showing 500 out of 784 lines.\nUse more precise expression if possible.\n\nnet/xfrm/Makefile=19=obj-$(CONFIG_XFRM_ALGO) += xfrm_algo.o\nnet/xfrm/Makefile:20:obj-$(CONFIG_XFRM_USER) += xfrm_user.o\nnet/xfrm/Makefile-21-obj-$(CONFIG_XFRM_USER_COMPAT) += xfrm_compat.o\n--\nnet/xfrm/xfrm_compat.c=19=struct compat_xfrm_lifetime_cur {\n--\nnet/xfrm/xfrm_compat.c-22-\nnet/xfrm/xfrm_compat.c:23:struct compat_xfrm_userpolicy_info {\nnet/xfrm/xfrm_compat.c-24-\tstruct xfrm_selector sel;\n--\nnet/xfrm/xfrm_compat.c-31-\nnet/xfrm/xfrm_compat.c:32:struct compat_xfrm_usersa_info {\nnet/xfrm/xfrm_compat.c-33-\tstruct xfrm_selector sel;\n--\nnet/xfrm/xfrm_compat.c-44-\nnet/xfrm/xfrm_compat.c:45:struct compat_xfrm_user_acquire {\nnet/xfrm/xfrm_compat.c-46-\tstruct xfrm_id id;\n--\nnet/xfrm/xfrm_compat.c-48-\tstruct xfrm_selector sel;\nnet/xfrm/xfrm_compat.c:49:\tstruct compat_xfrm_userpolicy_info policy;\nnet/xfrm/xfrm_compat.c-50-\t/* 4 bytes additional padding on 64bit */\n--\nnet/xfrm/xfrm_compat.c-53-\nnet/xfrm/xfrm_compat.c:54:struct compat_xfrm_userspi_info {\nnet/xfrm/xfrm_compat.c:55:\tstruct compat_xfrm_usersa_info info;\nnet/xfrm/xfrm_compat.c-56-\t/* 4 bytes additional padding on 64bit */\n--\nnet/xfrm/xfrm_compat.c-59-\nnet/xfrm/xfrm_compat.c:60:struct compat_xfrm_user_expire {\nnet/xfrm/xfrm_compat.c:61:\tstruct compat_xfrm_usersa_info state;\nnet/xfrm/xfrm_compat.c-62-\t/* 8 bytes additional padding on 64bit */\n--\nnet/xfrm/xfrm_compat.c-65-\nnet/xfrm/xfrm_compat.c:66:struct compat_xfrm_user_polexpire {\nnet/xfrm/xfrm_compat.c:67:\tstruct compat_xfrm_userpolicy_info pol;\nnet/xfrm/xfrm_compat.c-68-\t/* 8 bytes additional padding on 64bit */\n--\nnet/xfrm/xfrm_compat.c=74=static const int compat_msg_min[XFRM_NR_MSGTYPES] = {\nnet/xfrm/xfrm_compat.c:75:\t[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_usersa_info),\nnet/xfrm/xfrm_compat.c:76:\t[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),\nnet/xfrm/xfrm_compat.c:77:\t[XFRM_MSG_GETSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),\nnet/xfrm/xfrm_compat.c:78:\t[XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_userpolicy_info),\nnet/xfrm/xfrm_compat.c:79:\t[XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),\nnet/xfrm/xfrm_compat.c:80:\t[XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),\nnet/xfrm/xfrm_compat.c:81:\t[XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_userspi_info),\nnet/xfrm/xfrm_compat.c:82:\t[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_user_acquire),\nnet/xfrm/xfrm_compat.c:83:\t[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_user_expire),\nnet/xfrm/xfrm_compat.c:84:\t[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_userpolicy_info),\nnet/xfrm/xfrm_compat.c:85:\t[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_usersa_info),\nnet/xfrm/xfrm_compat.c:86:\t[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_user_polexpire),\nnet/xfrm/xfrm_compat.c:87:\t[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),\nnet/xfrm/xfrm_compat.c-88-\t[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,\n--\nnet/xfrm/xfrm_compat.c-90-\t[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),\nnet/xfrm/xfrm_compat.c:91:\t[XFRM_MSG_REPORT      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),\nnet/xfrm/xfrm_compat.c:92:\t[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),\nnet/xfrm/xfrm_compat.c-93-\t[XFRM_MSG_NEWSADINFO  - XFRM_MSG_BASE] = sizeof(u32),\n--\nnet/xfrm/xfrm_compat.c-96-\t[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),\nnet/xfrm/xfrm_compat.c:97:\t[XFRM_MSG_MAPPING        - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_mapping),\nnet/xfrm/xfrm_compat.c:98:\t[XFRM_MSG_MIGRATE_STATE  - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_migrate_state),\nnet/xfrm/xfrm_compat.c-99-};\n--\nnet/xfrm/xfrm_compat.c=101=static const struct nla_policy compat_policy[XFRMA_MAX+1] = {\nnet/xfrm/xfrm_compat.c-102-\t[XFRMA_UNSPEC]          = { .strict_start_type = XFRMA_SA_DIR },\nnet/xfrm/xfrm_compat.c:103:\t[XFRMA_SA]\t\t= { .len = XMSGSIZE(compat_xfrm_usersa_info)},\nnet/xfrm/xfrm_compat.c:104:\t[XFRMA_POLICY]\t\t= { .len = XMSGSIZE(compat_xfrm_userpolicy_info)},\nnet/xfrm/xfrm_compat.c-105-\t[XFRMA_LASTUSED]\t= { .type = NLA_U64},\n--\nnet/xfrm/xfrm_compat.c-111-\t[XFRMA_ENCAP]\t\t= { .len = sizeof(struct xfrm_encap_tmpl) },\nnet/xfrm/xfrm_compat.c:112:\t[XFRMA_TMPL]\t\t= { .len = sizeof(struct xfrm_user_tmpl) },\nnet/xfrm/xfrm_compat.c:113:\t[XFRMA_SEC_CTX]\t\t= { .len = sizeof(struct xfrm_user_sec_ctx) },\nnet/xfrm/xfrm_compat.c-114-\t[XFRMA_LTIME_VAL]\t= { .len = sizeof(struct xfrm_lifetime_cur) },\n--\nnet/xfrm/xfrm_compat.c-119-\t[XFRMA_COADDR]\t\t= { .len = sizeof(xfrm_address_t) },\nnet/xfrm/xfrm_compat.c:120:\t[XFRMA_POLICY_TYPE]\t= { .len = sizeof(struct xfrm_userpolicy_type)},\nnet/xfrm/xfrm_compat.c:121:\t[XFRMA_MIGRATE]\t\t= { .len = sizeof(struct xfrm_user_migrate) },\nnet/xfrm/xfrm_compat.c:122:\t[XFRMA_KMADDRESS]\t= { .len = sizeof(struct xfrm_user_kmaddress) },\nnet/xfrm/xfrm_compat.c-123-\t[XFRMA_MARK]\t\t= { .len = sizeof(struct xfrm_mark) },\n--\nnet/xfrm/xfrm_compat.c-128-\t[XFRMA_ADDRESS_FILTER]\t= { .len = sizeof(struct xfrm_address_filter) },\nnet/xfrm/xfrm_compat.c:129:\t[XFRMA_OFFLOAD_DEV]\t= { .len = sizeof(struct xfrm_user_offload) },\nnet/xfrm/xfrm_compat.c-130-\t[XFRMA_SET_MARK]\t= { .type = NLA_U32 },\n--\nnet/xfrm/xfrm_compat.c=139=static struct nlmsghdr *xfrm_nlmsg_put_compat(struct sk_buff *skb,\n--\nnet/xfrm/xfrm_compat.c-181-\tcase XFRM_MSG_EXPIRE: {\nnet/xfrm/xfrm_compat.c:182:\t\tconst struct xfrm_user_expire *src_ue  = nlmsg_data(nlh_src);\nnet/xfrm/xfrm_compat.c:183:\t\tstruct compat_xfrm_user_expire *dst_ue = nlmsg_data(nlh_dst);\nnet/xfrm/xfrm_compat.c-184-\nnet/xfrm/xfrm_compat.c:185:\t\t/* compat_xfrm_user_expire has 4-byte smaller state */\nnet/xfrm/xfrm_compat.c-186-\t\tmemcpy(dst_ue, src_ue, sizeof(dst_ue-\u003estate));\n--\nnet/xfrm/xfrm_compat.c-190-\tcase XFRM_MSG_ACQUIRE: {\nnet/xfrm/xfrm_compat.c:191:\t\tconst struct xfrm_user_acquire *src_ua  = nlmsg_data(nlh_src);\nnet/xfrm/xfrm_compat.c:192:\t\tstruct compat_xfrm_user_acquire *dst_ua = nlmsg_data(nlh_dst);\nnet/xfrm/xfrm_compat.c-193-\nnet/xfrm/xfrm_compat.c:194:\t\tmemcpy(dst_ua, src_ua, offsetof(struct compat_xfrm_user_acquire, aalgos));\nnet/xfrm/xfrm_compat.c-195-\t\tdst_ua-\u003eaalgos = src_ua-\u003eaalgos;\n--\nnet/xfrm/xfrm_compat.c-201-\tcase XFRM_MSG_POLEXPIRE: {\nnet/xfrm/xfrm_compat.c:202:\t\tconst struct xfrm_user_polexpire *src_upe  = nlmsg_data(nlh_src);\nnet/xfrm/xfrm_compat.c:203:\t\tstruct compat_xfrm_user_polexpire *dst_upe = nlmsg_data(nlh_dst);\nnet/xfrm/xfrm_compat.c-204-\nnet/xfrm/xfrm_compat.c:205:\t\t/* compat_xfrm_user_polexpire has 4-byte smaller state */\nnet/xfrm/xfrm_compat.c-206-\t\tmemcpy(dst_upe, src_upe, sizeof(dst_upe-\u003epol));\n--\nnet/xfrm/xfrm_compat.c-210-\tcase XFRM_MSG_ALLOCSPI: {\nnet/xfrm/xfrm_compat.c:211:\t\tconst struct xfrm_userspi_info *src_usi = nlmsg_data(nlh_src);\nnet/xfrm/xfrm_compat.c:212:\t\tstruct compat_xfrm_userspi_info *dst_usi = nlmsg_data(nlh_dst);\nnet/xfrm/xfrm_compat.c-213-\nnet/xfrm/xfrm_compat.c:214:\t\t/* compat_xfrm_user_polexpire has 4-byte smaller state */\nnet/xfrm/xfrm_compat.c-215-\t\tmemcpy(dst_usi, src_usi, sizeof(src_usi-\u003einfo));\n--\nnet/xfrm/xfrm_compat.c=239=static int xfrm_xlate64_attr(struct sk_buff *dst, const struct nlattr *src)\n--\nnet/xfrm/xfrm_compat.c-252-\tcase XFRMA_SA:\nnet/xfrm/xfrm_compat.c:253:\t\treturn xfrm_nla_cpy(dst, src, XMSGSIZE(compat_xfrm_usersa_info));\nnet/xfrm/xfrm_compat.c-254-\tcase XFRMA_POLICY:\nnet/xfrm/xfrm_compat.c:255:\t\treturn xfrm_nla_cpy(dst, src, XMSGSIZE(compat_xfrm_userpolicy_info));\nnet/xfrm/xfrm_compat.c-256-\tcase XFRMA_SEC_CTX:\n--\nnet/xfrm/xfrm_compat.c=338=static int xfrm_alloc_compat(struct sk_buff *skb, const struct nlmsghdr *nlh_src)\n--\nnet/xfrm/xfrm_compat.c-368-/* Calculates len of translated 64-bit message. */\nnet/xfrm/xfrm_compat.c:369:static size_t xfrm_user_rcv_calculate_len64(const struct nlmsghdr *src,\nnet/xfrm/xfrm_compat.c-370-\t\t\t\t\t    struct nlattr *attrs[XFRMA_MAX + 1],\n--\nnet/xfrm/xfrm_compat.c=414=static int xfrm_attr_cpy32(void *dst, size_t *pos, const struct nlattr *src,\n--\nnet/xfrm/xfrm_compat.c-419-\nnet/xfrm/xfrm_compat.c:420:\t/* xfrm_user_rcv_msg_compat() relies on fact that 32-bit messages\nnet/xfrm/xfrm_compat.c-421-\t * have the same len or shorted than 64-bit ones.\n--\nnet/xfrm/xfrm_compat.c=479=static int xfrm_xlate32(struct nlmsghdr *dst, const struct nlmsghdr *src,\n--\nnet/xfrm/xfrm_compat.c-518-\tcase XFRM_MSG_EXPIRE: {\nnet/xfrm/xfrm_compat.c:519:\t\tconst struct compat_xfrm_user_expire *src_ue = nlmsg_data(src);\nnet/xfrm/xfrm_compat.c:520:\t\tstruct xfrm_user_expire *dst_ue = nlmsg_data(dst);\nnet/xfrm/xfrm_compat.c-521-\nnet/xfrm/xfrm_compat.c:522:\t\t/* compat_xfrm_user_expire has 4-byte smaller state */\nnet/xfrm/xfrm_compat.c-523-\t\tmemcpy(dst_ue, src_ue, sizeof(src_ue-\u003estate));\n--\nnet/xfrm/xfrm_compat.c-527-\tcase XFRM_MSG_ACQUIRE: {\nnet/xfrm/xfrm_compat.c:528:\t\tconst struct compat_xfrm_user_acquire *src_ua = nlmsg_data(src);\nnet/xfrm/xfrm_compat.c:529:\t\tstruct xfrm_user_acquire *dst_ua = nlmsg_data(dst);\nnet/xfrm/xfrm_compat.c-530-\nnet/xfrm/xfrm_compat.c:531:\t\tmemcpy(dst_ua, src_ua, offsetof(struct compat_xfrm_user_acquire, aalgos));\nnet/xfrm/xfrm_compat.c-532-\t\tdst_ua-\u003eaalgos = src_ua-\u003eaalgos;\n--\nnet/xfrm/xfrm_compat.c-538-\tcase XFRM_MSG_POLEXPIRE: {\nnet/xfrm/xfrm_compat.c:539:\t\tconst struct compat_xfrm_user_polexpire *src_upe = nlmsg_data(src);\nnet/xfrm/xfrm_compat.c:540:\t\tstruct xfrm_user_polexpire *dst_upe = nlmsg_data(dst);\nnet/xfrm/xfrm_compat.c-541-\nnet/xfrm/xfrm_compat.c:542:\t\t/* compat_xfrm_user_polexpire has 4-byte smaller state */\nnet/xfrm/xfrm_compat.c-543-\t\tmemcpy(dst_upe, src_upe, sizeof(src_upe-\u003epol));\n--\nnet/xfrm/xfrm_compat.c-547-\tcase XFRM_MSG_ALLOCSPI: {\nnet/xfrm/xfrm_compat.c:548:\t\tconst struct compat_xfrm_userspi_info *src_usi = nlmsg_data(src);\nnet/xfrm/xfrm_compat.c:549:\t\tstruct xfrm_userspi_info *dst_usi = nlmsg_data(dst);\nnet/xfrm/xfrm_compat.c-550-\nnet/xfrm/xfrm_compat.c:551:\t\t/* compat_xfrm_user_polexpire has 4-byte smaller state */\nnet/xfrm/xfrm_compat.c-552-\t\tmemcpy(dst_usi, src_usi, sizeof(src_usi-\u003einfo));\n--\nnet/xfrm/xfrm_compat.c-598-\nnet/xfrm/xfrm_compat.c:599:static struct nlmsghdr *xfrm_user_rcv_msg_compat(const struct nlmsghdr *h32,\nnet/xfrm/xfrm_compat.c-600-\t\t\tint maxtype, const struct nla_policy *policy,\n--\nnet/xfrm/xfrm_compat.c-625-\nnet/xfrm/xfrm_compat.c:626:\tlen = xfrm_user_rcv_calculate_len64(h32, attrs, maxtype);\nnet/xfrm/xfrm_compat.c-627-\t/* The message doesn't need translation */\n--\nnet/xfrm/xfrm_compat.c-644-\nnet/xfrm/xfrm_compat.c:645:static int xfrm_user_policy_compat(u8 **pdata32, int optlen)\nnet/xfrm/xfrm_compat.c-646-{\nnet/xfrm/xfrm_compat.c:647:\tstruct compat_xfrm_userpolicy_info *p = (void *)*pdata32;\nnet/xfrm/xfrm_compat.c-648-\tu8 *src_templates, *dst_templates;\n--\nnet/xfrm/xfrm_compat.c=670=static struct xfrm_translator xfrm_translator = {\n--\nnet/xfrm/xfrm_compat.c-672-\t.alloc_compat\t\t\t= xfrm_alloc_compat,\nnet/xfrm/xfrm_compat.c:673:\t.rcv_msg_compat\t\t\t= xfrm_user_rcv_msg_compat,\nnet/xfrm/xfrm_compat.c:674:\t.xlate_user_policy_sockptr\t= xfrm_user_policy_compat,\nnet/xfrm/xfrm_compat.c-675-};\n--\nnet/xfrm/xfrm_device.c=239=int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,\nnet/xfrm/xfrm_device.c:240:\t\t       const struct xfrm_user_offload *xuo,\nnet/xfrm/xfrm_device.c-241-\t\t       struct netlink_ext_ack *extack)\n--\nnet/xfrm/xfrm_device.c=359=int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,\nnet/xfrm/xfrm_device.c:360:\t\t\tstruct xfrm_user_offload *xuo, u8 dir,\nnet/xfrm/xfrm_device.c-361-\t\t\tstruct netlink_ext_ack *extack)\n--\nnet/xfrm/xfrm_policy.c=4666=int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,\n--\nnet/xfrm/xfrm_policy.c-4669-\t\t struct xfrm_encap_tmpl *encap, u32 if_id,\nnet/xfrm/xfrm_policy.c:4670:\t\t struct netlink_ext_ack *extack, struct xfrm_user_offload *xuo)\nnet/xfrm/xfrm_policy.c-4671-{\n--\nnet/xfrm/xfrm_state.c=1957=static inline int clone_security(struct xfrm_state *x, struct xfrm_sec_ctx *security)\nnet/xfrm/xfrm_state.c-1958-{\nnet/xfrm/xfrm_state.c:1959:\tstruct xfrm_user_sec_ctx *uctx;\nnet/xfrm/xfrm_state.c-1960-\tint size = sizeof(*uctx) + security-\u003ectx_len;\n--\nnet/xfrm/xfrm_state.c=3009=EXPORT_SYMBOL_GPL(xfrm_unregister_translator);\n--\nnet/xfrm/xfrm_state.c-3011-\nnet/xfrm/xfrm_state.c:3012:int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, int optlen)\nnet/xfrm/xfrm_state.c-3013-{\n--\nnet/xfrm/xfrm_state.c-3068-}\nnet/xfrm/xfrm_state.c:3069:EXPORT_SYMBOL(xfrm_user_policy);\nnet/xfrm/xfrm_state.c-3070-\n--\nnet/xfrm/xfrm_user.c-1-// SPDX-License-Identifier: GPL-2.0-only\nnet/xfrm/xfrm_user.c:2:/* xfrm_user.c: User interface to configure xfrm engine.\nnet/xfrm/xfrm_user.c-3- *\n--\nnet/xfrm/xfrm_user.c=123=static inline int verify_sec_ctx_len(struct nlattr **attrs, struct netlink_ext_ack *extack)\n--\nnet/xfrm/xfrm_user.c-125-\tstruct nlattr *rt = attrs[XFRMA_SEC_CTX];\nnet/xfrm/xfrm_user.c:126:\tstruct xfrm_user_sec_ctx *uctx;\nnet/xfrm/xfrm_user.c-127-\n--\nnet/xfrm/xfrm_user.c-132-\tif (uctx-\u003elen \u003e nla_len(rt) ||\nnet/xfrm/xfrm_user.c:133:\t    uctx-\u003elen != (sizeof(struct xfrm_user_sec_ctx) + uctx-\u003ectx_len)) {\nnet/xfrm/xfrm_user.c-134-\t\tNL_SET_ERR_MSG(extack, \"Invalid security context length\");\n--\nnet/xfrm/xfrm_user.c-140-\nnet/xfrm/xfrm_user.c:141:static inline int verify_replay(struct xfrm_usersa_info *p,\nnet/xfrm/xfrm_user.c-142-\t\t\t\tstruct nlattr **attrs, u8 sa_dir,\n--\nnet/xfrm/xfrm_user.c=285=static int verify_selector_prefixlen(u16 family,\n--\nnet/xfrm/xfrm_user.c-316-\nnet/xfrm/xfrm_user.c:317:static int verify_newsa_info(struct xfrm_usersa_info *p,\nnet/xfrm/xfrm_user.c-318-\t\t\t     struct nlattr **attrs,\n--\nnet/xfrm/xfrm_user.c=787=static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,\n--\nnet/xfrm/xfrm_user.c-819-\nnet/xfrm/xfrm_user.c:820:static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)\nnet/xfrm/xfrm_user.c-821-{\n--\nnet/xfrm/xfrm_user.c-824-\tif (xfrm_ctx) {\nnet/xfrm/xfrm_user.c:825:\t\tlen += sizeof(struct xfrm_user_sec_ctx);\nnet/xfrm/xfrm_user.c-826-\t\tlen += xfrm_ctx-\u003ectx_len;\n--\nnet/xfrm/xfrm_user.c-830-\nnet/xfrm/xfrm_user.c:831:static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)\nnet/xfrm/xfrm_user.c-832-{\n--\nnet/xfrm/xfrm_user.c=909=static struct xfrm_state *xfrm_state_construct(struct net *net,\nnet/xfrm/xfrm_user.c:910:\t\t\t\t\t       struct xfrm_usersa_info *p,\nnet/xfrm/xfrm_user.c-911-\t\t\t\t\t       struct nlattr **attrs,\n--\nnet/xfrm/xfrm_user.c=1041=static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,\n--\nnet/xfrm/xfrm_user.c-1044-\tstruct net *net = sock_net(skb-\u003esk);\nnet/xfrm/xfrm_user.c:1045:\tstruct xfrm_usersa_info *p = nlmsg_data(nlh);\nnet/xfrm/xfrm_user.c-1046-\tstruct xfrm_state *x;\n--\nnet/xfrm/xfrm_user.c-1085-\nnet/xfrm/xfrm_user.c:1086:static struct xfrm_state *xfrm_user_state_lookup(struct net *net,\nnet/xfrm/xfrm_user.c:1087:\t\t\t\t\t\t struct xfrm_usersa_id *p,\nnet/xfrm/xfrm_user.c-1088-\t\t\t\t\t\t struct nlattr **attrs,\n--\nnet/xfrm/xfrm_user.c=1120=static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,\n--\nnet/xfrm/xfrm_user.c-1126-\tstruct km_event c;\nnet/xfrm/xfrm_user.c:1127:\tstruct xfrm_usersa_id *p = nlmsg_data(nlh);\nnet/xfrm/xfrm_user.c-1128-\nnet/xfrm/xfrm_user.c:1129:\tx = xfrm_user_state_lookup(net, p, attrs, \u0026err);\nnet/xfrm/xfrm_user.c-1130-\tif (x == NULL)\n--\nnet/xfrm/xfrm_user.c-1156-\nnet/xfrm/xfrm_user.c:1157:static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)\nnet/xfrm/xfrm_user.c-1158-{\n--\nnet/xfrm/xfrm_user.c=1185=static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)\nnet/xfrm/xfrm_user.c-1186-{\nnet/xfrm/xfrm_user.c:1187:\tstruct xfrm_user_sec_ctx *uctx;\nnet/xfrm/xfrm_user.c-1188-\tstruct nlattr *attr;\n--\nnet/xfrm/xfrm_user.c=1206=static void xso_to_xuo_ifindex(const struct xfrm_dev_offload *xso, int ifindex,\nnet/xfrm/xfrm_user.c:1207:\t\t\t       struct xfrm_user_offload *xuo)\nnet/xfrm/xfrm_user.c-1208-{\n--\nnet/xfrm/xfrm_user.c=1217=static void xso_to_xuo(const struct xfrm_dev_offload *xso,\nnet/xfrm/xfrm_user.c:1218:\t\t       struct xfrm_user_offload *xuo)\nnet/xfrm/xfrm_user.c-1219-{\n--\nnet/xfrm/xfrm_user.c=1224=static int copy_user_offload_ifindex(const struct xfrm_dev_offload *xso,\n--\nnet/xfrm/xfrm_user.c-1226-{\nnet/xfrm/xfrm_user.c:1227:\tstruct xfrm_user_offload *xuo;\nnet/xfrm/xfrm_user.c-1228-\tstruct nlattr *attr;\n--\nnet/xfrm/xfrm_user.c=1385=static int copy_to_user_state_extra(struct xfrm_state *x,\nnet/xfrm/xfrm_user.c:1386:\t\t\t\t    struct xfrm_usersa_info *p,\nnet/xfrm/xfrm_user.c-1387-\t\t\t\t    struct sk_buff *skb)\n--\nnet/xfrm/xfrm_user.c=1499=static int dump_one_state(struct xfrm_state *x, int count, void *ptr)\n--\nnet/xfrm/xfrm_user.c-1504-\tstruct xfrm_translator *xtr;\nnet/xfrm/xfrm_user.c:1505:\tstruct xfrm_usersa_info *p;\nnet/xfrm/xfrm_user.c-1506-\tstruct nlmsghdr *nlh;\n--\nnet/xfrm/xfrm_user.c=1851=static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,\n--\nnet/xfrm/xfrm_user.c-1854-\tstruct net *net = sock_net(skb-\u003esk);\nnet/xfrm/xfrm_user.c:1855:\tstruct xfrm_usersa_id *p = nlmsg_data(nlh);\nnet/xfrm/xfrm_user.c-1856-\tstruct xfrm_state *x;\n--\nnet/xfrm/xfrm_user.c-1859-\nnet/xfrm/xfrm_user.c:1860:\tx = xfrm_user_state_lookup(net, p, attrs, \u0026err);\nnet/xfrm/xfrm_user.c-1861-\tif (x == NULL)\n--\nnet/xfrm/xfrm_user.c=1875=static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,\n--\nnet/xfrm/xfrm_user.c-1880-\tstruct xfrm_state *x;\nnet/xfrm/xfrm_user.c:1881:\tstruct xfrm_userspi_info *p;\nnet/xfrm/xfrm_user.c-1882-\tstruct sk_buff *resp_skb;\n--\nnet/xfrm/xfrm_user.c=1971=static int verify_policy_type(u8 type, struct netlink_ext_ack *extack)\n--\nnet/xfrm/xfrm_user.c-1987-\nnet/xfrm/xfrm_user.c:1988:static int verify_newpolicy_info(struct xfrm_userpolicy_info *p,\nnet/xfrm/xfrm_user.c-1989-\t\t\t\t struct netlink_ext_ack *extack)\n--\nnet/xfrm/xfrm_user.c=2053=static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)\n--\nnet/xfrm/xfrm_user.c-2055-\tstruct nlattr *rt = attrs[XFRMA_SEC_CTX];\nnet/xfrm/xfrm_user.c:2056:\tstruct xfrm_user_sec_ctx *uctx;\nnet/xfrm/xfrm_user.c-2057-\n--\nnet/xfrm/xfrm_user.c-2064-\nnet/xfrm/xfrm_user.c:2065:static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,\nnet/xfrm/xfrm_user.c-2066-\t\t\t   int nr)\n--\nnet/xfrm/xfrm_user.c-2089-\nnet/xfrm/xfrm_user.c:2090:static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family,\nnet/xfrm/xfrm_user.c-2091-\t\t\t int dir, struct netlink_ext_ack *extack)\n--\nnet/xfrm/xfrm_user.c=2158=static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs,\n--\nnet/xfrm/xfrm_user.c-2165-\t} else {\nnet/xfrm/xfrm_user.c:2166:\t\tstruct xfrm_user_tmpl *utmpl = nla_data(rt);\nnet/xfrm/xfrm_user.c-2167-\t\tint nr = nla_len(rt) / sizeof(*utmpl);\n--\nnet/xfrm/xfrm_user.c=2179=static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs,\n--\nnet/xfrm/xfrm_user.c-2182-\tstruct nlattr *rt = attrs[XFRMA_POLICY_TYPE];\nnet/xfrm/xfrm_user.c:2183:\tstruct xfrm_userpolicy_type *upt;\nnet/xfrm/xfrm_user.c-2184-\tu8 type = XFRM_POLICY_TYPE_MAIN;\n--\nnet/xfrm/xfrm_user.c-2199-\nnet/xfrm/xfrm_user.c:2200:static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)\nnet/xfrm/xfrm_user.c-2201-{\n--\nnet/xfrm/xfrm_user.c-2211-\nnet/xfrm/xfrm_user.c:2212:static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)\nnet/xfrm/xfrm_user.c-2213-{\n--\nnet/xfrm/xfrm_user.c=2227=static struct xfrm_policy *xfrm_policy_construct(struct net *net,\nnet/xfrm/xfrm_user.c:2228:\t\t\t\t\t\t struct xfrm_userpolicy_info *p,\nnet/xfrm/xfrm_user.c-2229-\t\t\t\t\t\t struct nlattr **attrs,\n--\nnet/xfrm/xfrm_user.c=2274=static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,\n--\nnet/xfrm/xfrm_user.c-2278-\tstruct net *net = sock_net(skb-\u003esk);\nnet/xfrm/xfrm_user.c:2279:\tstruct xfrm_userpolicy_info *p = nlmsg_data(nlh);\nnet/xfrm/xfrm_user.c-2280-\tstruct xfrm_policy *xp;\n--\nnet/xfrm/xfrm_user.c=2321=static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)\nnet/xfrm/xfrm_user.c-2322-{\nnet/xfrm/xfrm_user.c:2323:\tstruct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];\nnet/xfrm/xfrm_user.c-2324-\tint i;\n--\nnet/xfrm/xfrm_user.c-2332-\tfor (i = 0; i \u003c xp-\u003exfrm_nr; i++) {\nnet/xfrm/xfrm_user.c:2333:\t\tstruct xfrm_user_tmpl *up = \u0026vec[i];\nnet/xfrm/xfrm_user.c-2334-\t\tstruct xfrm_tmpl *kp = \u0026xp-\u003exfrm_vec[i];\n--\nnet/xfrm/xfrm_user.c-2349-\treturn nla_put(skb, XFRMA_TMPL,\nnet/xfrm/xfrm_user.c:2350:\t\t       sizeof(struct xfrm_user_tmpl) * xp-\u003exfrm_nr, vec);\nnet/xfrm/xfrm_user.c-2351-}\n--\nnet/xfrm/xfrm_user.c=2367=static inline unsigned int userpolicy_type_attrsize(void)\n--\nnet/xfrm/xfrm_user.c-2369-#ifdef CONFIG_XFRM_SUB_POLICY\nnet/xfrm/xfrm_user.c:2370:\treturn nla_total_size(sizeof(struct xfrm_userpolicy_type));\nnet/xfrm/xfrm_user.c-2371-#else\n--\nnet/xfrm/xfrm_user.c=2377=static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)\nnet/xfrm/xfrm_user.c-2378-{\nnet/xfrm/xfrm_user.c:2379:\tstruct xfrm_userpolicy_type upt;\nnet/xfrm/xfrm_user.c-2380-\nnet/xfrm/xfrm_user.c:2381:\t/* Sadly there are two holes in struct xfrm_userpolicy_type */\nnet/xfrm/xfrm_user.c-2382-\tmemset(\u0026upt, 0, sizeof(upt));\n--\nnet/xfrm/xfrm_user.c=2395=static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)\n--\nnet/xfrm/xfrm_user.c-2397-\tstruct xfrm_dump_info *sp = ptr;\nnet/xfrm/xfrm_user.c:2398:\tstruct xfrm_userpolicy_info *p;\nnet/xfrm/xfrm_user.c-2399-\tstruct sk_buff *in_skb = sp-\u003ein_skb;\n--\nnet/xfrm/xfrm_user.c=2504=static int xfrm_notify_userpolicy(struct net *net)\nnet/xfrm/xfrm_user.c-2505-{\nnet/xfrm/xfrm_user.c:2506:\tstruct xfrm_userpolicy_default *up;\nnet/xfrm/xfrm_user.c-2507-\tint len = NLMSG_ALIGN(sizeof(*up));\n--\nnet/xfrm/xfrm_user.c-2535-\nnet/xfrm/xfrm_user.c:2536:static bool xfrm_userpolicy_is_valid(__u8 policy)\nnet/xfrm/xfrm_user.c-2537-{\n--\nnet/xfrm/xfrm_user.c=2542=static int xfrm_set_default(struct sk_buff *skb, struct nlmsghdr *nlh,\n--\nnet/xfrm/xfrm_user.c-2545-\tstruct net *net = sock_net(skb-\u003esk);\nnet/xfrm/xfrm_user.c:2546:\tstruct xfrm_userpolicy_default *up = nlmsg_data(nlh);\nnet/xfrm/xfrm_user.c-2547-\nnet/xfrm/xfrm_user.c:2548:\tif (xfrm_userpolicy_is_valid(up-\u003ein))\nnet/xfrm/xfrm_user.c-2549-\t\tWRITE_ONCE(net-\u003exfrm.policy_default[XFRM_POLICY_IN], up-\u003ein);\nnet/xfrm/xfrm_user.c-2550-\nnet/xfrm/xfrm_user.c:2551:\tif (xfrm_userpolicy_is_valid(up-\u003efwd))\nnet/xfrm/xfrm_user.c-2552-\t\tWRITE_ONCE(net-\u003exfrm.policy_default[XFRM_POLICY_FWD], up-\u003efwd);\nnet/xfrm/xfrm_user.c-2553-\nnet/xfrm/xfrm_user.c:2554:\tif (xfrm_userpolicy_is_valid(up-\u003eout))\nnet/xfrm/xfrm_user.c-2555-\t\tWRITE_ONCE(net-\u003exfrm.policy_default[XFRM_POLICY_OUT], up-\u003eout);\n--\nnet/xfrm/xfrm_user.c=2563=static int xfrm_get_default(struct sk_buff *skb, struct nlmsghdr *nlh,\n--\nnet/xfrm/xfrm_user.c-2568-\tstruct net *net = sock_net(skb-\u003esk);\nnet/xfrm/xfrm_user.c:2569:\tstruct xfrm_userpolicy_default *r_up;\nnet/xfrm/xfrm_user.c:2570:\tint len = NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_default));\nnet/xfrm/xfrm_user.c-2571-\tu32 portid = NETLINK_CB(skb).portid;\n--\nnet/xfrm/xfrm_user.c=2593=static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,\n--\nnet/xfrm/xfrm_user.c-2598-\tstruct xfrm_policy *xp;\nnet/xfrm/xfrm_user.c:2599:\tstruct xfrm_userpolicy_id *p;\nnet/xfrm/xfrm_user.c-2600-\tu8 type = XFRM_POLICY_TYPE_MAIN;\n--\nnet/xfrm/xfrm_user.c-2635-\t\tif (rt) {\nnet/xfrm/xfrm_user.c:2636:\t\t\tstruct xfrm_user_sec_ctx *uctx = nla_data(rt);\nnet/xfrm/xfrm_user.c-2637-\n--\nnet/xfrm/xfrm_user.c=2677=static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,\n--\nnet/xfrm/xfrm_user.c-2682-\tstruct km_event c;\nnet/xfrm/xfrm_user.c:2683:\tstruct xfrm_usersa_flush *p = nlmsg_data(nlh);\nnet/xfrm/xfrm_user.c-2684-\tint err;\n--\nnet/xfrm/xfrm_user.c=2792=static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,\n--\nnet/xfrm/xfrm_user.c-2802-\tstruct xfrm_aevent_id *p = nlmsg_data(nlh);\nnet/xfrm/xfrm_user.c:2803:\tstruct xfrm_usersa_id *id = \u0026p-\u003esa_id;\nnet/xfrm/xfrm_user.c-2804-\n--\nnet/xfrm/xfrm_user.c=2927=static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,\n--\nnet/xfrm/xfrm_user.c-2932-\tstruct xfrm_policy *xp;\nnet/xfrm/xfrm_user.c:2933:\tstruct xfrm_user_polexpire *up = nlmsg_data(nlh);\nnet/xfrm/xfrm_user.c:2934:\tstruct xfrm_userpolicy_info *p = \u0026up-\u003epol;\nnet/xfrm/xfrm_user.c-2935-\tu8 type = XFRM_POLICY_TYPE_MAIN;\n--\nnet/xfrm/xfrm_user.c-2965-\t\tif (rt) {\nnet/xfrm/xfrm_user.c:2966:\t\t\tstruct xfrm_user_sec_ctx *uctx = nla_data(rt);\nnet/xfrm/xfrm_user.c-2967-\n--\nnet/xfrm/xfrm_user.c=2994=static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,\n--\nnet/xfrm/xfrm_user.c-3000-\tint err;\nnet/xfrm/xfrm_user.c:3001:\tstruct xfrm_user_expire *ue = nlmsg_data(nlh);\nnet/xfrm/xfrm_user.c:3002:\tstruct xfrm_usersa_info *p = \u0026ue-\u003estate;\nnet/xfrm/xfrm_user.c-3003-\tstruct xfrm_mark m;\n--\nnet/xfrm/xfrm_user.c=3032=static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,\n--\nnet/xfrm/xfrm_user.c-3037-\tstruct xfrm_policy *xp;\nnet/xfrm/xfrm_user.c:3038:\tstruct xfrm_user_tmpl *ut;\nnet/xfrm/xfrm_user.c-3039-\tint i;\n--\nnet/xfrm/xfrm_user.c-3042-\nnet/xfrm/xfrm_user.c:3043:\tstruct xfrm_user_acquire *ua = nlmsg_data(nlh);\nnet/xfrm/xfrm_user.c-3044-\tstruct xfrm_state *x = xfrm_state_alloc(net);\n--\nnet/xfrm/xfrm_user.c=3108=static void copy_from_user_migrate_state(struct xfrm_migrate *ma,\nnet/xfrm/xfrm_user.c:3109:\t\t\t\t\t const struct xfrm_user_migrate_state *um)\nnet/xfrm/xfrm_user.c-3110-{\n--\nnet/xfrm/xfrm_user.c=3127=static int copy_from_user_migrate(struct xfrm_migrate *ma,\n--\nnet/xfrm/xfrm_user.c-3132-\tstruct nlattr *rt = attrs[XFRMA_MIGRATE];\nnet/xfrm/xfrm_user.c:3133:\tstruct xfrm_user_migrate *um;\nnet/xfrm/xfrm_user.c-3134-\tint i, num_migrate;\n--\nnet/xfrm/xfrm_user.c-3136-\tif (k != NULL) {\nnet/xfrm/xfrm_user.c:3137:\t\tstruct xfrm_user_kmaddress *uk;\nnet/xfrm/xfrm_user.c-3138-\n--\n\n"
}

gemini-3.8-flash

null

null

							input: 18336
							output: 28
							thoughts: 29
						

Okay, let's dive into this. Here's my thought process on this Kconfig configuration:

**Investigating CONFIG_XFRM_USER in the Linux Kernel Kconfig System**

Right, so I need to figure out what `CONFIG_XFRM_USER` actually *means* within the Kconfig system. I have a hunch, of course, given my experience with network configuration in the kernel, but let's confirm. The obvious first step is to go digging through the Kconfig files. The most direct approach is a quick grep. I'll search for the defining line: `config XFRM_USER`. That should pinpoint the exact location where this configuration option is declared and, crucially, where its associated documentation, if any, is located. This will give me the authoritative definition and any hints about its purpose, dependencies, and implications. I need to understand this configuration in detail, as I always like to. Time to get to work.

{
  "Expression": "config XFRM_USER",
  "PathPrefix": "net/"
}

{
  "Output": "net/xfrm/Kconfig=22=if INET\nnet/xfrm/Kconfig:23:config XFRM_USER\nnet/xfrm/Kconfig-24-\ttristate \"Transformation user configuration interface\"\n--\nnet/xfrm/Kconfig-31-\nnet/xfrm/Kconfig:32:config XFRM_USER_COMPAT\nnet/xfrm/Kconfig-33-\ttristate \"Compatible ABI support\"\n"
}

gemini-3.8-flash

null

null

							input: 18717
							output: 33
							thoughts: 19
						

Here's a summary of my thought process, as requested:

**Navigating the XFRM Configuration**

Okay, let's dive into this. Based on the task at hand, I immediately think, "XFRM configuration - sounds like a kernel security or networking module." The most logical place to start digging is the Kconfig file within the `net/xfrm` directory. I'm going to assume that line 22 or thereabouts likely contains the main configuration option related to the XFRM framework's core functionality, or at least a high-level grouping. It's a strategic move to understand the overarching settings before drilling down into specifics. I'll read around that line, expecting a broad view of the configurable elements.

{
  "File": "net/xfrm/Kconfig",
  "FirstLine": 1,
  "LineCount": 40
}

{
  "Contents": "   1:\t# SPDX-License-Identifier: GPL-2.0-only\n   2:\t#\n   3:\t# XFRM configuration\n   4:\t#\n   5:\tconfig XFRM\n   6:\t\tbool\n   7:\t\tdepends on INET\n   8:\t\tselect GRO_CELLS\n   9:\t\tselect SKB_EXTENSIONS\n  10:\t\n  11:\tconfig XFRM_OFFLOAD\n  12:\t\tbool\n  13:\t\n  14:\tconfig XFRM_ALGO\n  15:\t\ttristate\n  16:\t\tselect XFRM\n  17:\t\tselect CRYPTO\n  18:\t\tselect CRYPTO_AEAD\n  19:\t\tselect CRYPTO_HASH\n  20:\t\tselect CRYPTO_SKCIPHER\n  21:\t\n  22:\tif INET\n  23:\tconfig XFRM_USER\n  24:\t\ttristate \"Transformation user configuration interface\"\n  25:\t\tselect XFRM_ALGO\n  26:\t\thelp\n  27:\t\t  Support for Transformation(XFRM) user configuration interface\n  28:\t\t  like IPsec used by native Linux tools.\n  29:\t\n  30:\t\t  If unsure, say Y.\n  31:\t\n  32:\tconfig XFRM_USER_COMPAT\n  33:\t\ttristate \"Compatible ABI support\"\n  34:\t\tdepends on XFRM_USER \u0026\u0026 COMPAT_FOR_U64_ALIGNMENT \u0026\u0026 \\\n  35:\t\t\tHAVE_EFFICIENT_UNALIGNED_ACCESS\n  36:\t\tselect WANT_COMPAT_NETLINK_MESSAGES\n  37:\t\thelp\n  38:\t\t  Transformation(XFRM) user configuration interface like IPsec\n  39:\t\t  used by compatible Linux applications.\n  40:\t\n"
}

gemini-3.8-flash

null

null

							input: 19392
							output: 39
							thoughts: 165
						

**Analyzing the Kernel's XFRM User Space Interaction**

Okay, so `CONFIG_XFRM_USER` definitely relies on `INET`. That's good to keep in mind. Now, I need to get a better grasp on the function `attach_auth_trunc`. I want to understand its purpose and how it's being used within the system. First, I need to know where it is called. Let's dig into the source code and find the call sites for `attach_auth_trunc`. Ah, here we are in `net/xfrm/xfrm_user.c`, that makes sense. I see a function definition:

```c
static struct xfrm_state *xfrm_state_construct(struct net *net,
					       struct xfrm_usersa_info *p,
					       struct nlattr **attrs,
					       int *errp,
					       struct netlink_ext_ack *extack)
```

I'll keep `xfrm_state_construct` in mind. Alright, let's zoom in on `xfrm_user.c` and take a look at the code between lines 930-970. This will likely provide some crucial context around where and how `attach_auth_trunc` is being called.

{
  "File": "net/xfrm/xfrm_user.c",
  "FirstLine": 930,
  "LineCount": 40
}

{
  "Contents": " 930:\t\tif (attrs[XFRMA_COADDR]) {\n 931:\t\t\tx-\u003ecoaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),\n 932:\t\t\t\t\t    sizeof(*x-\u003ecoaddr), GFP_KERNEL);\n 933:\t\t\tif (x-\u003ecoaddr == NULL)\n 934:\t\t\t\tgoto error;\n 935:\t\t}\n 936:\t\n 937:\t\tif (attrs[XFRMA_SA_EXTRA_FLAGS])\n 938:\t\t\tx-\u003eprops.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);\n 939:\t\n 940:\t\tif ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD], extack)))\n 941:\t\t\tgoto error;\n 942:\t\tif ((err = attach_auth_trunc(\u0026x-\u003eaalg, \u0026x-\u003eprops.aalgo,\n 943:\t\t\t\t\t     attrs[XFRMA_ALG_AUTH_TRUNC], extack)))\n 944:\t\t\tgoto error;\n 945:\t\tif (!x-\u003eaalg) {\n 946:\t\t\tif ((err = attach_auth(\u0026x-\u003eaalg, \u0026x-\u003eprops.aalgo,\n 947:\t\t\t\t\t       attrs[XFRMA_ALG_AUTH], extack)))\n 948:\t\t\t\tgoto error;\n 949:\t\t}\n 950:\t\tif ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT], extack)))\n 951:\t\t\tgoto error;\n 952:\t\tif ((err = attach_one_algo(\u0026x-\u003ecalg, \u0026x-\u003eprops.calgo,\n 953:\t\t\t\t\t   xfrm_calg_get_byname,\n 954:\t\t\t\t\t   attrs[XFRMA_ALG_COMP], extack)))\n 955:\t\t\tgoto error;\n 956:\t\n 957:\t\tif (attrs[XFRMA_TFCPAD]) {\n 958:\t\t\tx-\u003etfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);\n 959:\t\t\tif (x-\u003etfcpad \u003e IP_MAX_MTU) {\n 960:\t\t\t\tNL_SET_ERR_MSG(extack, \"Excessive TFC padding\");\n 961:\t\t\t\terr = -EINVAL;\n 962:\t\t\t\tgoto error;\n 963:\t\t\t}\n 964:\t\t}\n 965:\t\n 966:\t\txfrm_mark_get(attrs, \u0026x-\u003emark);\n 967:\t\n 968:\t\txfrm_smark_init(attrs, \u0026x-\u003eprops.smark);\n 969:\t\n"
}

gemini-3.8-flash

null

null

							input: 20584
							output: 31
							thoughts: 51
						

**Tracing the Origins of `attach_auth_trunc`**

Okay, let's break this down. My goal is to understand the calling hierarchy related to `attach_auth_trunc`. I know it's directly called from `xfrm_state_construct`. Now, I need to figure out *where* `xfrm_state_construct` itself is being invoked. Best way to do that is a quick and dirty grep. Time to pull up the source code and find all instances of `xfrm_state_construct`. That should reveal the relevant entry points.

{
  "Expression": "xfrm_state_construct",
  "PathPrefix": "net/xfrm/"
}

{
  "Output": "net/xfrm/xfrm_user.c=898=static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m)\n--\nnet/xfrm/xfrm_user.c-908-\nnet/xfrm/xfrm_user.c:909:static struct xfrm_state *xfrm_state_construct(struct net *net,\nnet/xfrm/xfrm_user.c-910-\t\t\t\t\t       struct xfrm_usersa_info *p,\n--\nnet/xfrm/xfrm_user.c=1041=static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,\n--\nnet/xfrm/xfrm_user.c-1053-\nnet/xfrm/xfrm_user.c:1054:\tx = xfrm_state_construct(net, p, attrs, \u0026err, extack);\nnet/xfrm/xfrm_user.c-1055-\tif (!x)\n"
}

gemini-3.8-flash

null

null

							input: 21053
							output: 31
							thoughts: 160
						

**My Investigation into the `xfrm_state_construct` Function**

Okay, so `xfrm_state_construct` is called from `xfrm_add_sa`. That much is clear. But I need to be absolutely certain I understand the call graph. Is *that* the only place? I need to verify. Let me quickly scan around line 1054 of the relevant code, or better yet, I'll just grep for `xfrm_state_construct` and be thorough. Yup, grep only found it within `xfrm_add_sa`, as I suspected. Good.

Now, a related thought... what about `attach_auth_trunc`? Where else is *that* function called from? Let's take a look. Ah, here's line 685; that's the definition. And there's a call at line 942, inside `xfrm_state_construct` as well. Of course.

Finally, how *is* `xfrm_add_sa` dispatched in the first place? I need to trace this back. Is it a netlink message? Let me look at the netlink dispatch table within `xfrm_user.c`. I need the bigger picture of how this user-space interaction is set up.

{
  "Expression": "xfrm_add_sa",
  "PathPrefix": "net/xfrm/"
}

{
  "Output": "net/xfrm/xfrm_user.c=909=static struct xfrm_state *xfrm_state_construct(struct net *net,\n--\nnet/xfrm/xfrm_user.c-1040-\nnet/xfrm/xfrm_user.c:1041:static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,\nnet/xfrm/xfrm_user.c-1042-\t\t       struct nlattr **attrs, struct netlink_ext_ack *extack)\n--\nnet/xfrm/xfrm_user.c=2927=static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,\n--\nnet/xfrm/xfrm_user.c-2993-\nnet/xfrm/xfrm_user.c:2994:static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,\nnet/xfrm/xfrm_user.c-2995-\t\t\t      struct nlattr **attrs,\n--\nnet/xfrm/xfrm_user.c=3734=static const struct xfrm_link {\n--\nnet/xfrm/xfrm_user.c-3742-} xfrm_dispatch[XFRM_NR_MSGTYPES] = {\nnet/xfrm/xfrm_user.c:3743:\t[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },\nnet/xfrm/xfrm_user.c-3744-\t[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = { .doit = xfrm_del_sa        },\n--\nnet/xfrm/xfrm_user.c-3755-\t[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire   },\nnet/xfrm/xfrm_user.c:3756:\t[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },\nnet/xfrm/xfrm_user.c-3757-\t[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },\nnet/xfrm/xfrm_user.c:3758:\t[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },\nnet/xfrm/xfrm_user.c-3759-\t[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},\n"
}

gemini-3.8-flash

null

null

							input: 22246
							output: 34
							thoughts: 318
						

**Focusing Fuzzing Efforts in the XFRM Subsystem**

Okay, so I'm thinking about how to refine our fuzzing targets within the XFRM subsystem. I'm looking at `xfrm_add_sa` because it handles both `XFRM_MSG_NEWSA` and `XFRM_MSG_UPDSA` messages. Then I thought about `xfrm_state_construct` and `attach_auth_trunc`. All three are static. Now the question is, is `attach_auth_trunc` actually getting inlined by the compiler? It's defined as static in `xfrm_user.c`, so it should have a symbol, unless the compiler optimized it out. Can syzkaller focus specifically on `attach_auth_trunc`, `xfrm_add_sa`, or `xfrm_state_construct`?

Alright, let's think about this systematically. I need to identify specific, non-ubiquitous kernel functions. These are the ones that should be in `FocusSymbols`. So, `xfrm_add_sa`, `xfrm_state_construct`, and `attach_auth_trunc` are all good candidates, right? They're all in the same file, `xfrm_user.c`.

Okay, I'm confirming that these functions are static, but in C, static functions typically *do* have symbols unless inlined. So we are good.

Wait a second, what's `xfrm_user_rcv_msg`? Ah, that's the netlink receiver for XFRM messages. That's relevant; it's the entry point! Need to double check, I should see if that is in `xfrm_user.c` as well.

{
  "Expression": "xfrm_user_rcv_msg",
  "PathPrefix": "net/xfrm/"
}

{
  "Output": "net/xfrm/xfrm_compat.c=414=static int xfrm_attr_cpy32(void *dst, size_t *pos, const struct nlattr *src,\n--\nnet/xfrm/xfrm_compat.c-419-\nnet/xfrm/xfrm_compat.c:420:\t/* xfrm_user_rcv_msg_compat() relies on fact that 32-bit messages\nnet/xfrm/xfrm_compat.c-421-\t * have the same len or shorted than 64-bit ones.\n--\nnet/xfrm/xfrm_compat.c=479=static int xfrm_xlate32(struct nlmsghdr *dst, const struct nlmsghdr *src,\n--\nnet/xfrm/xfrm_compat.c-598-\nnet/xfrm/xfrm_compat.c:599:static struct nlmsghdr *xfrm_user_rcv_msg_compat(const struct nlmsghdr *h32,\nnet/xfrm/xfrm_compat.c-600-\t\t\tint maxtype, const struct nla_policy *policy,\n--\nnet/xfrm/xfrm_compat.c=670=static struct xfrm_translator xfrm_translator = {\n--\nnet/xfrm/xfrm_compat.c-672-\t.alloc_compat\t\t\t= xfrm_alloc_compat,\nnet/xfrm/xfrm_compat.c:673:\t.rcv_msg_compat\t\t\t= xfrm_user_rcv_msg_compat,\nnet/xfrm/xfrm_compat.c-674-\t.xlate_user_policy_sockptr\t= xfrm_user_policy_compat,\n--\nnet/xfrm/xfrm_user.c=3775=static int xfrm_reject_unused_attr(int type, struct nlattr **attrs,\n--\nnet/xfrm/xfrm_user.c-3830-\nnet/xfrm/xfrm_user.c:3831:static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,\nnet/xfrm/xfrm_user.c-3832-\t\t\t     struct netlink_ext_ack *extack)\n--\nnet/xfrm/xfrm_user.c=3918=static void xfrm_netlink_rcv(struct sk_buff *skb)\n--\nnet/xfrm/xfrm_user.c-3922-\tmutex_lock(\u0026net-\u003exfrm.xfrm_cfg_mutex);\nnet/xfrm/xfrm_user.c:3923:\tnetlink_rcv_skb(skb, \u0026xfrm_user_rcv_msg);\nnet/xfrm/xfrm_user.c-3924-\tmutex_unlock(\u0026net-\u003exfrm.xfrm_cfg_mutex);\n"
}

gemini-3.8-flash

null

null

							input: 23703
							output: 32
							thoughts: 53
						

Here's my summary, as though I'm thinking through this myself:

**Digging into `xfrm_user.c`**

Okay, so I'm looking at `xfrm_user.c` and I've noticed that `xfrm_state_construct` and `attach_auth_trunc` are declared as `static` within that file. That's a bit of an interesting implementation choice, and I want to understand *why* they decided to make these functions static. To get the full picture, and understand any potential implications or design decisions, the next logical step is to dive into the git history for the commit that introduced these static declarations. Seeing the surrounding code, the discussion, and the reasoning behind the change in the commit message will give me the context I need. It's the best way to grasp the intent behind this design choice.

{
  "Expression": "Invalid length requested for truncated ICV",
  "PathPrefix": "net/xfrm/"
}

{
  "Output": "net/xfrm/xfrm_user.c=685=static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,\n--\nnet/xfrm/xfrm_user.c-703-\t    (ualg-\u003ealg_trunc_len \u003e 0 \u0026\u0026 ualg-\u003ealg_trunc_len \u003c 32)) {\nnet/xfrm/xfrm_user.c:704:\t\tNL_SET_ERR_MSG(extack, \"Invalid length requested for truncated ICV\");\nnet/xfrm/xfrm_user.c-705-\t\treturn -EINVAL;\n"
}

gemini-3.8-flash

null

null

							input: 24133
							output: 27
							thoughts: 302
						

**Analyzing the Integrity Check Value Truncation Length**

Okay, let's break this down. Why was this check introduced? I'm looking at:
`ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits || (ualg->alg_trunc_len & 7) || (ualg->alg_trunc_len > 0 && ualg->alg_trunc_len < 32)`

Right, so it's flagging if `ualg->alg_trunc_len` isn't byte-aligned (`& 7 != 0`), or if it's some value between 1 and 31 bits (`ualg->alg_trunc_len > 0 && ualg->alg_trunc_len < 32`).

Hold on. There's also the case of `ualg->alg_trunc_len == 0`. Ah, I see in line 714:

```c
	if (!p->alg_trunc_len)
		p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
```

So, if it's zero, it defaults to `icv_truncbits`. Which means, if it's *not* zero, it has to be greater than or equal to 32 bits, a multiple of 8 (byte-aligned), and it has to be less than or equal to `icv_fullbits`.

But why is this important? I need to understand the impact of `aalg->alg_trunc_len` beyond the initialization and validation. Let's do a quick grep search across the kernel for `alg_trunc_len` to see where else it's being used. That'll provide the context needed to truly understand the rationale behind this check.

{
  "Expression": "alg_trunc_len",
  "PathPrefix": "net/"
}

{
  "Output": "net/ipv4/ah4.c=481=static int ah_init_state(struct xfrm_state *x, struct netlink_ext_ack *extack)\n--\nnet/ipv4/ah4.c-529-\tahp-\u003eicv_full_len = aalg_desc-\u003euinfo.auth.icv_fullbits/8;\nnet/ipv4/ah4.c:530:\tahp-\u003eicv_trunc_len = x-\u003eaalg-\u003ealg_trunc_len/8;\nnet/ipv4/ah4.c-531-\n--\nnet/ipv4/esp4.c=1023=static int esp_init_authenc(struct xfrm_state *x,\n--\nnet/ipv4/esp4.c-1098-\t\terr = crypto_aead_setauthsize(\nnet/ipv4/esp4.c:1099:\t\t\taead, x-\u003eaalg-\u003ealg_trunc_len / 8);\nnet/ipv4/esp4.c-1100-\t\tif (err) {\n--\nnet/ipv6/ah6.c=695=static int ah6_init_state(struct xfrm_state *x, struct netlink_ext_ack *extack)\n--\nnet/ipv6/ah6.c-743-\tahp-\u003eicv_full_len = aalg_desc-\u003euinfo.auth.icv_fullbits/8;\nnet/ipv6/ah6.c:744:\tahp-\u003eicv_trunc_len = x-\u003eaalg-\u003ealg_trunc_len/8;\nnet/ipv6/ah6.c-745-\n--\nnet/ipv6/esp6.c=1061=static int esp_init_authenc(struct xfrm_state *x,\n--\nnet/ipv6/esp6.c-1136-\t\terr = crypto_aead_setauthsize(\nnet/ipv6/esp6.c:1137:\t\t\taead, x-\u003eaalg-\u003ealg_trunc_len / 8);\nnet/ipv6/esp6.c-1138-\t\tif (err) {\n--\nnet/key/af_key.c=1075=static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,\n--\nnet/key/af_key.c-1203-\t\t}\nnet/key/af_key.c:1204:\t\tx-\u003eaalg-\u003ealg_trunc_len = a-\u003euinfo.auth.icv_truncbits;\nnet/key/af_key.c-1205-\t\tx-\u003eprops.aalgo = sa-\u003esadb_sa_auth;\n--\nnet/xfrm/xfrm_user.c=653=static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,\n--\nnet/xfrm/xfrm_user.c-677-\tp-\u003ealg_key_len = ualg-\u003ealg_key_len;\nnet/xfrm/xfrm_user.c:678:\tp-\u003ealg_trunc_len = algo-\u003euinfo.auth.icv_truncbits;\nnet/xfrm/xfrm_user.c-679-\tmemcpy(p-\u003ealg_key, ualg-\u003ealg_key, (ualg-\u003ealg_key_len + 7) / 8);\n--\nnet/xfrm/xfrm_user.c=685=static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,\n--\nnet/xfrm/xfrm_user.c-700-\t}\nnet/xfrm/xfrm_user.c:701:\tif (ualg-\u003ealg_trunc_len \u003e algo-\u003euinfo.auth.icv_fullbits ||\nnet/xfrm/xfrm_user.c:702:\t    (ualg-\u003ealg_trunc_len \u0026 7) ||\nnet/xfrm/xfrm_user.c:703:\t    (ualg-\u003ealg_trunc_len \u003e 0 \u0026\u0026 ualg-\u003ealg_trunc_len \u003c 32)) {\nnet/xfrm/xfrm_user.c-704-\t\tNL_SET_ERR_MSG(extack, \"Invalid length requested for truncated ICV\");\n--\nnet/xfrm/xfrm_user.c-713-\tstrscpy(p-\u003ealg_name, algo-\u003ename);\nnet/xfrm/xfrm_user.c:714:\tif (!p-\u003ealg_trunc_len)\nnet/xfrm/xfrm_user.c:715:\t\tp-\u003ealg_trunc_len = algo-\u003euinfo.auth.icv_truncbits;\nnet/xfrm/xfrm_user.c-716-\n--\nnet/xfrm/xfrm_user.c=1258=static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)\n--\nnet/xfrm/xfrm_user.c-1284-\tap-\u003ealg_key_len = auth-\u003ealg_key_len;\nnet/xfrm/xfrm_user.c:1285:\tap-\u003ealg_trunc_len = auth-\u003ealg_trunc_len;\nnet/xfrm/xfrm_user.c-1286-\tif (redact_secret \u0026\u0026 auth-\u003ealg_key_len)\n"
}

gemini-3.8-flash

null

null

							input: 26195
							output: 37
							thoughts: 76
						

Here's my summary, as though I were thinking through the code:

**Diving into the AH4 Code**

Alright, let's get down to brass tacks. I'm taking a look at the Advanced Header (AH) implementation for IPv4, specifically `net/ipv4/ah4.c`. I want to understand how the ICV truncation length is handled. I see this line: `ahp->icv_trunc_len = x->aalg->alg_trunc_len/8;`. So, the ICV truncation length is calculated by taking `alg_trunc_len` which is probably some bit count, and dividing it by 8 to convert it into bytes. That makes sense, standard byte manipulation.

Now, let me zoom in on a particular section in that file. Let me take a look at the code around line 530, there's bound to be something critical that will help me understand this better.

{
  "File": "net/ipv4/ah4.c",
  "FirstLine": 520,
  "LineCount": 30
}

{
  "Contents": " 520:\t\taalg_desc = xfrm_aalg_get_byname(x-\u003eaalg-\u003ealg_name, 0);\n 521:\t\tBUG_ON(!aalg_desc);\n 522:\t\n 523:\t\tif (aalg_desc-\u003euinfo.auth.icv_fullbits/8 !=\n 524:\t\t    crypto_ahash_digestsize(ahash)) {\n 525:\t\t\tNL_SET_ERR_MSG(extack, \"Kernel was unable to initialize cryptographic operations\");\n 526:\t\t\tgoto error;\n 527:\t\t}\n 528:\t\n 529:\t\tahp-\u003eicv_full_len = aalg_desc-\u003euinfo.auth.icv_fullbits/8;\n 530:\t\tahp-\u003eicv_trunc_len = x-\u003eaalg-\u003ealg_trunc_len/8;\n 531:\t\n 532:\t\tif (x-\u003eprops.flags \u0026 XFRM_STATE_ALIGN4)\n 533:\t\t\tx-\u003eprops.header_len = XFRM_ALIGN4(sizeof(struct ip_auth_hdr) +\n 534:\t\t\t\t\t\t\t  ahp-\u003eicv_trunc_len);\n 535:\t\telse\n 536:\t\t\tx-\u003eprops.header_len = XFRM_ALIGN8(sizeof(struct ip_auth_hdr) +\n 537:\t\t\t\t\t\t\t  ahp-\u003eicv_trunc_len);\n 538:\t\tif (x-\u003eprops.mode == XFRM_MODE_TUNNEL)\n 539:\t\t\tx-\u003eprops.header_len += sizeof(struct iphdr);\n 540:\t\tx-\u003edata = ahp;\n 541:\t\n 542:\t\treturn 0;\n 543:\t\n 544:\terror:\n 545:\t\tif (ahp) {\n 546:\t\t\tcrypto_free_ahash(ahp-\u003eahash);\n 547:\t\t\tkfree(ahp);\n 548:\t\t}\n 549:\t\treturn -EINVAL;\n"
}

gemini-3.8-flash

null

null

							input: 27043
							output: 35
							thoughts: 32
						

Okay, here's my take on those thoughts, framed as a first-person summary, keeping in mind my expertise:

**Examining the Data Flow Around `icv_trunc_len`**

Alright, so I'm digging into this code, and I need to figure out the exact role of `icv_trunc_len`. It seems like it's a critical parameter somewhere. The first question that pops into my head is, "Where exactly *is* this being used in the context of the data flow?" I've got to trace its path to see how it's influencing the processing. My immediate targets for investigation are the `ah4_output` and `ah4_input` structures (or variables, depending on the language). They are the obvious entry points to this code, so those are where I'll look first. A quick search should reveal how `icv_trunc_len` is being read, written, or otherwise interacting with the information contained in `ah4_output` and `ah4_input`. Once I see that, the rest of the puzzle should fall into place quickly. I'm expecting to find some important insights to optimize the code.

{
  "Expression": "icv_trunc_len",
  "PathPrefix": "net/ipv4/ah4.c"
}

{
  "Output": "net/ipv4/ah4.c=117=static void ah_output_done(void *data, int err)\n--\nnet/ipv4/ah4.c-134-\ticv = ah_tmp_icv(seqhi, seqhi_len);\nnet/ipv4/ah4.c:135:\tmemcpy(ah-\u003eauth_data, icv, ahp-\u003eicv_trunc_len);\nnet/ipv4/ah4.c-136-\n--\nnet/ipv4/ah4.c=149=static int ah_output(struct xfrm_state *x, struct sk_buff *skb)\n--\nnet/ipv4/ah4.c-191-\nnet/ipv4/ah4.c:192:\tmemset(ah-\u003eauth_data, 0, ahp-\u003eicv_trunc_len);\nnet/ipv4/ah4.c-193-\n--\nnet/ipv4/ah4.c-217-\tif (x-\u003eprops.flags \u0026 XFRM_STATE_ALIGN4)\nnet/ipv4/ah4.c:218:\t\tah-\u003ehdrlen  = (XFRM_ALIGN4(sizeof(*ah) + ahp-\u003eicv_trunc_len) \u003e\u003e 2) - 2;\nnet/ipv4/ah4.c-219-\telse\nnet/ipv4/ah4.c:220:\t\tah-\u003ehdrlen  = (XFRM_ALIGN8(sizeof(*ah) + ahp-\u003eicv_trunc_len) \u003e\u003e 2) - 2;\nnet/ipv4/ah4.c-221-\n--\nnet/ipv4/ah4.c-250-\nnet/ipv4/ah4.c:251:\tmemcpy(ah-\u003eauth_data, icv, ahp-\u003eicv_trunc_len);\nnet/ipv4/ah4.c-252-\n--\nnet/ipv4/ah4.c=267=static void ah_input_done(void *data, int err)\n--\nnet/ipv4/ah4.c-288-\tauth_data = ah_tmp_auth(seqhi, seqhi_len);\nnet/ipv4/ah4.c:289:\ticv = ah_tmp_icv(auth_data, ahp-\u003eicv_trunc_len);\nnet/ipv4/ah4.c-290-\nnet/ipv4/ah4.c:291:\terr = crypto_memneq(icv, auth_data, ahp-\u003eicv_trunc_len) ? -EBADMSG : 0;\nnet/ipv4/ah4.c-292-\tif (err)\n--\nnet/ipv4/ah4.c=310=static int ah_input(struct xfrm_state *x, struct sk_buff *skb)\n--\nnet/ipv4/ah4.c-342-\t\tif (ah_hlen != XFRM_ALIGN4(sizeof(*ah) + ahp-\u003eicv_full_len) \u0026\u0026\nnet/ipv4/ah4.c:343:\t\t    ah_hlen != XFRM_ALIGN4(sizeof(*ah) + ahp-\u003eicv_trunc_len))\nnet/ipv4/ah4.c-344-\t\t\tgoto out;\n--\nnet/ipv4/ah4.c-346-\t\tif (ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp-\u003eicv_full_len) \u0026\u0026\nnet/ipv4/ah4.c:347:\t\t    ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp-\u003eicv_trunc_len))\nnet/ipv4/ah4.c-348-\t\t\tgoto out;\n--\nnet/ipv4/ah4.c-375-\twork_iph = ah_alloc_tmp(ahash, nfrags + sglists, ihl +\nnet/ipv4/ah4.c:376:\t\t\t\tahp-\u003eicv_trunc_len + seqhi_len);\nnet/ipv4/ah4.c-377-\tif (!work_iph) {\n--\nnet/ipv4/ah4.c-383-\tauth_data = ah_tmp_auth(seqhi, seqhi_len);\nnet/ipv4/ah4.c:384:\ticv = ah_tmp_icv(auth_data, ahp-\u003eicv_trunc_len);\nnet/ipv4/ah4.c-385-\treq = ah_tmp_req(ahash, icv);\n--\nnet/ipv4/ah4.c-389-\tmemcpy(work_iph, iph, ihl);\nnet/ipv4/ah4.c:390:\tmemcpy(auth_data, ah-\u003eauth_data, ahp-\u003eicv_trunc_len);\nnet/ipv4/ah4.c:391:\tmemset(ah-\u003eauth_data, 0, ahp-\u003eicv_trunc_len);\nnet/ipv4/ah4.c-392-\n--\nnet/ipv4/ah4.c-428-\nnet/ipv4/ah4.c:429:\terr = crypto_memneq(icv, auth_data, ahp-\u003eicv_trunc_len) ? -EBADMSG : 0;\nnet/ipv4/ah4.c-430-\tif (err)\n--\nnet/ipv4/ah4.c=481=static int ah_init_state(struct xfrm_state *x, struct netlink_ext_ack *extack)\n--\nnet/ipv4/ah4.c-529-\tahp-\u003eicv_full_len = aalg_desc-\u003euinfo.auth.icv_fullbits/8;\nnet/ipv4/ah4.c:530:\tahp-\u003eicv_trunc_len = x-\u003eaalg-\u003ealg_trunc_len/8;\nnet/ipv4/ah4.c-531-\n--\nnet/ipv4/ah4.c-533-\t\tx-\u003eprops.header_len = XFRM_ALIGN4(sizeof(struct ip_auth_hdr) +\nnet/ipv4/ah4.c:534:\t\t\t\t\t\t  ahp-\u003eicv_trunc_len);\nnet/ipv4/ah4.c-535-\telse\nnet/ipv4/ah4.c-536-\t\tx-\u003eprops.header_len = XFRM_ALIGN8(sizeof(struct ip_auth_hdr) +\nnet/ipv4/ah4.c:537:\t\t\t\t\t\t  ahp-\u003eicv_trunc_len);\nnet/ipv4/ah4.c-538-\tif (x-\u003eprops.mode == XFRM_MODE_TUNNEL)\n"
}

gemini-3.8-flash

null

null

							input: 29029
							output: 20
							thoughts: 1335
						

**Fuzzing Decision for Defensive Check in `attach_auth_trunc`**

Okay, let's break this down. My initial thought is focused on a potential vulnerability: if `x->aalg->alg_trunc_len` isn't a multiple of 8, is less than 32, or is zero, the `ahp->icv_trunc_len` could lead to buffer issues. The code checks for this in `attach_auth_trunc()` with this:
```c
	if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits ||
	    (ualg->alg_trunc_len & 7) ||
	    (ualg->alg_trunc_len > 0 && ualg->alg_trunc_len < 32)) {
		NL_SET_ERR_MSG(extack, "Invalid length requested for truncated ICV");
		return -EINVAL;
	}
```
Now, the key question: is this defensive check reachable in a standard fuzzing environment like QEMU/syzkaller? The answer is *yes*. A user with `CAP_NET_ADMIN` (or within a user namespace, which syzkaller uses) can send netlink messages with `XFRM_MSG_NEWSA` or `XFRM_MSG_UPDSA` containing `XFRMA_ALG_AUTH_TRUNC`. Syzkaller *does* have descriptions for XFRM (`syz_init_net_socket`, `sendmsg$xfrm`, etc.).

Now, the triage philosophy. First, reachability is the primary gate: if code can execute, it *should* be fuzzed, especially if there's modified logic or assertions. This patch touches `net/xfrm/xfrm_user.c`, which handles core networking via netlink, and it introduces validation checks, which means `WorthFuzzing = true`. No question.

Now, which functions do I focus on for the fuzzer? We need specific entrypoints and feature logic, not ubiquitous functions. I need to make sure I am not adding in functions that are called everywhere.
`attach_auth_trunc` is *the* function being modified here. Let's trace back from there. It's static, so potentially inlined. It is called from `xfrm_state_construct`. `xfrm_state_construct` is called only from `xfrm_add_sa`. I need to ensure that these functions are specific.
After further investigation, `xfrm_add_sa` is called only when an `XFRM_MSG_NEWSA` or `XFRM_MSG_UPDSA` netlink message is sent, so it's *very* specific. `attach_auth_trunc` is being directly modified. and `xfrm_state_construct` is the constructing function, so that is specific, as well.

I will focus on the following symbols:
*   `xfrm_add_sa`
*   `xfrm_state_construct`
*   `attach_auth_trunc`

I also confirmed that `attach_auth_trunc` is only called by one other function, `xfrm_state_construct`. I'll also double-check via grep that there are no hidden callers of `xfrm_state_construct` within the kernel source to be entirely sure.

{
  "Expression": "xfrm_state_construct"
}

{
  "Output": "net/xfrm/xfrm_user.c=898=static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m)\n--\nnet/xfrm/xfrm_user.c-908-\nnet/xfrm/xfrm_user.c:909:static struct xfrm_state *xfrm_state_construct(struct net *net,\nnet/xfrm/xfrm_user.c-910-\t\t\t\t\t       struct xfrm_usersa_info *p,\n--\nnet/xfrm/xfrm_user.c=1041=static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,\n--\nnet/xfrm/xfrm_user.c-1053-\nnet/xfrm/xfrm_user.c:1054:\tx = xfrm_state_construct(net, p, attrs, \u0026err, extack);\nnet/xfrm/xfrm_user.c-1055-\tif (!x)\n"
}

gemini-3.8-flash

null

null

							input: 31387
							output: 19
							thoughts: 17
						

Okay, here's my take on those thoughts, tailored for an expert audience:

**Kernel-Wide Investigation of `attach_auth_trunc`**

Alright, so we need to revisit `attach_auth_trunc`. It's occurred to me that we can't just be looking at it in isolation anymore. There's a nagging feeling that its impact might be more pervasive than we've previously accounted for. My intuition is telling me that we need to perform a comprehensive, kernel-wide audit of its usage and implications. We have to be absolutely certain we're not missing potential vulnerabilities or unintended consequences stemming from it, particularly considering its role in... well, you know, the sensitive areas. This means a deep dive, checking *every* call site, *every* interaction, and understanding its behavior in *every* possible context. We need to map the control flow, identify any potential blind spots, and confirm our assumptions about its security guarantees. This isn't just a cursory glance; this is going to be a full-blown deep inspection. Let's get to it.

{
  "Expression": "attach_auth_trunc"
}

{
  "Output": "net/xfrm/xfrm_user.c=653=static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,\n--\nnet/xfrm/xfrm_user.c-684-\nnet/xfrm/xfrm_user.c:685:static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,\nnet/xfrm/xfrm_user.c-686-\t\t\t     struct nlattr *rta, struct netlink_ext_ack *extack)\n--\nnet/xfrm/xfrm_user.c=909=static struct xfrm_state *xfrm_state_construct(struct net *net,\n--\nnet/xfrm/xfrm_user.c-941-\t\tgoto error;\nnet/xfrm/xfrm_user.c:942:\tif ((err = attach_auth_trunc(\u0026x-\u003eaalg, \u0026x-\u003eprops.aalgo,\nnet/xfrm/xfrm_user.c-943-\t\t\t\t     attrs[XFRMA_ALG_AUTH_TRUNC], extack)))\n"
}

gemini-3.8-flash

null

null

							input: 31934
							output: 33
							thoughts: 380
						

**Analyzing the `EnableConfigs` for `xfrm_user.o`**

Okay, let's break down how we determine the necessary configuration options, or `EnableConfigs`, for `xfrm_user.o`. I'll start by examining the Kconfig files. From the `net/xfrm/Makefile`, I see `obj-$(CONFIG_XFRM_USER) += xfrm_user.o`. This tells me that `xfrm_user.o` is compiled into the kernel object only when `CONFIG_XFRM_USER` is enabled. Now, the key is understanding *when* `CONFIG_XFRM_USER` is enabled.

Looking at `net/xfrm/Kconfig`, I find the definition:

```
if INET
config XFRM_USER
	tristate "Transformation user configuration interface"
	select XFRM_ALGO
	help
	  Support for Transformation(XFRM) user configuration interface
	  like IPsec used by native Linux tools.

	  If unsure, say Y.
```

The crucial detail here is the `if INET` condition. This means `CONFIG_XFRM_USER` is only available if `CONFIG_INET` is also enabled. That's our first dependency. Furthermore, `CONFIG_XFRM_USER` *selects* `XFRM_ALGO`. Let's see what that implies.

Looking further, `config XFRM` in `net/xfrm/Kconfig` also depends on `INET`. Then, `config XFRM_ALGO` selects `XFRM`, `CRYPTO`, `CRYPTO_AEAD`, `CRYPTO_HASH`, and `CRYPTO_SKCIPHER`. So, we've established a dependency chain. `CONFIG_XFRM_USER` needs `CONFIG_INET`. `CONFIG_XFRM_ALGO` needs all those crypto related configs, and `CONFIG_XFRM_USER` then selects it.

To summarize, `CONFIG_INET` and `CONFIG_XFRM_USER` appear to be the primary configs to focus on. But I want to be thorough.

Before I conclude, let's check for any conditional compilation, like `#ifdef` directives, within the source file `net/xfrm/xfrm_user.c`. I want to see if any specific code blocks, especially around `attach_auth_trunc`, are gated by other configuration options that may not be directly implied by the Kconfig. I'll focus on lines around 685-718, since that's where `attach_auth_trunc` is defined. After a quick scan, there don't appear to be any conditional preprocessor directives directly around `attach_auth_trunc`.

To be complete, let me scan the entire `xfrm_user.c` file for any ifdefs to make sure I am not missing any dependencies.

{
  "Expression": "#if",
  "PathPrefix": "net/xfrm/xfrm_user.c"
}

{
  "Output": "net/xfrm/xfrm_user.c-32-#include \u003clinux/uaccess.h\u003e\nnet/xfrm/xfrm_user.c:33:#if IS_ENABLED(CONFIG_IPV6)\nnet/xfrm/xfrm_user.c-34-#include \u003clinux/in6.h\u003e\n--\nnet/xfrm/xfrm_user.c=267=static int verify_xfrm_family(u16 family, struct netlink_ext_ack *extack)\n--\nnet/xfrm/xfrm_user.c-272-\tcase AF_INET6:\nnet/xfrm/xfrm_user.c:273:#if IS_ENABLED(CONFIG_IPV6)\nnet/xfrm/xfrm_user.c-274-\t\treturn 0;\n--\nnet/xfrm/xfrm_user.c=285=static int verify_selector_prefixlen(u16 family,\n--\nnet/xfrm/xfrm_user.c-299-\tcase AF_INET6:\nnet/xfrm/xfrm_user.c:300:#if IS_ENABLED(CONFIG_IPV6)\nnet/xfrm/xfrm_user.c-301-\t\tif (sel-\u003eprefixlen_d \u003e 128 || sel-\u003eprefixlen_s \u003e 128) {\n--\nnet/xfrm/xfrm_user.c=317=static int verify_newsa_info(struct xfrm_usersa_info *p,\n--\nnet/xfrm/xfrm_user.c-413-\nnet/xfrm/xfrm_user.c:414:#if IS_ENABLED(CONFIG_IPV6)\nnet/xfrm/xfrm_user.c-415-\tcase IPPROTO_DSTOPTS:\n--\nnet/xfrm/xfrm_user.c=1206=static void xso_to_xuo_ifindex(const struct xfrm_dev_offload *xso, int ifindex,\n--\nnet/xfrm/xfrm_user.c-1215-\nnet/xfrm/xfrm_user.c:1216:#ifdef CONFIG_XFRM_MIGRATE\nnet/xfrm/xfrm_user.c-1217-static void xso_to_xuo(const struct xfrm_dev_offload *xso,\n--\nnet/xfrm/xfrm_user.c=1971=static int verify_policy_type(u8 type, struct netlink_ext_ack *extack)\n--\nnet/xfrm/xfrm_user.c-1974-\tcase XFRM_POLICY_TYPE_MAIN:\nnet/xfrm/xfrm_user.c:1975:#ifdef CONFIG_XFRM_SUB_POLICY\nnet/xfrm/xfrm_user.c-1976-\tcase XFRM_POLICY_TYPE_SUB:\n--\nnet/xfrm/xfrm_user.c=1988=static int verify_newpolicy_info(struct xfrm_userpolicy_info *p,\n--\nnet/xfrm/xfrm_user.c-2024-\tcase AF_INET6:\nnet/xfrm/xfrm_user.c:2025:#if IS_ENABLED(CONFIG_IPV6)\nnet/xfrm/xfrm_user.c-2026-\t\tif (p-\u003esel.prefixlen_d \u003e 128 || p-\u003esel.prefixlen_s \u003e 128) {\n--\nnet/xfrm/xfrm_user.c=2090=static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family,\n--\nnet/xfrm/xfrm_user.c-2139-\t\t\tbreak;\nnet/xfrm/xfrm_user.c:2140:#if IS_ENABLED(CONFIG_IPV6)\nnet/xfrm/xfrm_user.c-2141-\t\tcase AF_INET6:\n--\nnet/xfrm/xfrm_user.c=2367=static inline unsigned int userpolicy_type_attrsize(void)\nnet/xfrm/xfrm_user.c-2368-{\nnet/xfrm/xfrm_user.c:2369:#ifdef CONFIG_XFRM_SUB_POLICY\nnet/xfrm/xfrm_user.c-2370-\treturn nla_total_size(sizeof(struct xfrm_userpolicy_type));\n--\nnet/xfrm/xfrm_user.c-2375-\nnet/xfrm/xfrm_user.c:2376:#ifdef CONFIG_XFRM_SUB_POLICY\nnet/xfrm/xfrm_user.c-2377-static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)\n--\nnet/xfrm/xfrm_user.c=3032=static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,\n--\nnet/xfrm/xfrm_user.c-3106-\nnet/xfrm/xfrm_user.c:3107:#ifdef CONFIG_XFRM_MIGRATE\nnet/xfrm/xfrm_user.c-3108-static void copy_from_user_migrate_state(struct xfrm_migrate *ma,\n--\nnet/xfrm/xfrm_user.c=3526=static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,\n--\nnet/xfrm/xfrm_user.c-3532-\nnet/xfrm/xfrm_user.c:3533:#ifdef CONFIG_XFRM_MIGRATE\nnet/xfrm/xfrm_user.c-3534-static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)\n--\nnet/xfrm/xfrm_user.c=4249=static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,\n--\nnet/xfrm/xfrm_user.c-4264-\t\tbreak;\nnet/xfrm/xfrm_user.c:4265:#if IS_ENABLED(CONFIG_IPV6)\nnet/xfrm/xfrm_user.c-4266-\tcase AF_INET6:\n"
}

gemini-3.8-flash

null

null

							input: 34564
							output: 179
							thoughts: 493
						

**Analysis of XFRM_USER Configuration and Fuzzing Potential**

Okay, so I've been digging into this `XFRM_USER` configuration, specifically how it relates to `xfrm_user.c`. First, I confirmed that enabling `XFRM_USER` requires `CONFIG_INET`, which makes sense. I quickly checked for dependencies on `NETLINK` or similar, and as expected, `NETLINK` is part of `CONFIG_NET`, so that's all good. Therefore, my `EnableConfigs` list is `["XFRM_USER", "INET"]`.

Now, onto the meat of it. I need to identify the key functions and how they relate. The modified function is `attach_auth_trunc`, and its direct caller is `xfrm_state_construct`. This function, in turn, is reached via the netlink handler `xfrm_add_sa`. So my `FocusSymbols` are `["attach_auth_trunc", "xfrm_state_construct", "xfrm_add_sa"]`.

The important bit is to verify reachability from syzkaller. User space sends a netlink message, either `XFRM_MSG_NEWSA` or `XFRM_MSG_UPDSA`. In the attributes of that message, we see an `XFRMA_ALG_AUTH_TRUNC` attribute. `xfrm_add_sa` then receives that, calls `xfrm_state_construct`, which then calls `attach_auth_trunc` with the relevant data. Importantly, `attach_auth_trunc` eventually checks the `ualg->alg_trunc_len`. And, crucially, this is all completely reachable from userspace, no special hardware needed.

This brings me to `WorthFuzzing`. The addition of input validation checks for truncated ICV length (`alg_trunc_len & 7` and `alg_trunc_len < 32`) in `attach_auth_trunc()` makes this a definite "yes." We're talking core networking code within the XFRM netlink interface, easily reachable from userspace via netlink messages like `XFRM_MSG_NEWSA` or `XFRM_MSG_UPDSA` with the right attribute. This looks like a prime target.

All the pieces fit; this is a clear path. Time to `set-results`.

{
  "EnableConfigs": [
    "XFRM_USER",
    "INET"
  ],
  "FocusSymbols": [
    "attach_auth_trunc",
    "xfrm_state_construct",
    "xfrm_add_sa"
  ],
  "Reasoning": "The patch introduces additional validation checks in attach_auth_trunc() on the requested ICV truncation length (ensuring byte alignment and minimum length) when configuring IPsec SA authentication algorithms via XFRM netlink. This is reachable from unprivileged userspace (with user namespaces / CAP_NET_ADMIN) via netlink sockets (XFRM_MSG_NEWSA / XFRM_MSG_UPDSA with XFRMA_ALG_AUTH_TRUNC). Therefore, it warrants fuzzing to test the new validation logic and prevent regressions.",
  "WorthFuzzing": true
}

{
  "EnableConfigs": [
    "XFRM_USER",
    "INET"
  ],
  "FocusSymbols": [
    "attach_auth_trunc",
    "xfrm_state_construct",
    "xfrm_add_sa"
  ],
  "Reasoning": "The patch introduces additional validation checks in attach_auth_trunc() on the requested ICV truncation length (ensuring byte alignment and minimum length) when configuring IPsec SA authentication algorithms via XFRM netlink. This is reachable from unprivileged userspace (with user namespaces / CAP_NET_ADMIN) via netlink sockets (XFRM_MSG_NEWSA / XFRM_MSG_UPDSA with XFRMA_ALG_AUTH_TRUNC). Therefore, it warrants fuzzing to test the new validation logic and prevent regressions.",
  "WorthFuzzing": true
}

{
  "WorthFuzzing": true
}

null

core

null

{
  "KMSANReasoning": "The patch adds input validation in `attach_auth_trunc()` within `net/xfrm/xfrm_user.c`, rejecting truncated ICV lengths (`ualg-\u003ealg_trunc_len`) that are not byte-aligned (`\u0026 7 != 0`) or are between 1 and 31 bits (`\u003e 0 \u0026\u0026 \u003c 32`).\n\nThis change does not introduce or expose any uninitialized memory risks:\n1. It does not introduce new allocations, data structures, or struct padding.\n2. It does not expose kernel memory to user space via info-leaks; it merely validates incoming Netlink attributes.\n3. The conditional logic operates on `ualg-\u003ealg_trunc_len`, which comes from the received Netlink attribute data in the skb, not uninitialized kernel memory.\n4. It tightens input validation rather than loosening bounds, preventing invalid lengths from reaching crypto drivers and IPsec processing. Any memory safety issues that could have resulted from misaligned or small ICV lengths (e.g., out-of-bounds reads/writes in crypto or packet processing) are detectable by KASAN.\n\nTherefore, a dedicated KMSAN fuzzing session is not warranted.",
  "NeedsKMSAN": false
}

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.

Target architecture: amd64

For your convenience, here is the diff of the changes:
commit 3905086f33073e39e6aa89272788c34ef4156fbd
Author: syz-cluster <triage@syzkaller.com>
Date:   Mon Sep 21 17:01:58 2026 +0000

    syz-cluster: applied patch under review

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index a2587c7e796b4..d56a0095113b3 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -698,7 +698,9 @@ static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
 		NL_SET_ERR_MSG(extack, "Requested AUTH_TRUNC algorithm not found");
 		return -ENOSYS;
 	}
-	if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) {
+	if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits ||
+	    (ualg->alg_trunc_len & 7) ||
+	    (ualg->alg_trunc_len > 0 && ualg->alg_trunc_len < 32)) {
 		NL_SET_ERR_MSG(extack, "Invalid length requested for truncated ICV");
 		return -EINVAL;
 	}

gemini-3.8-flash

null

null

							input: 2186
							output: 39
							thoughts: 277
						

**Analyzing the xfrm_user.c Patch**

Okay, let's dive into this patch in `net/xfrm/xfrm_user.c`. I need to understand what's being changed in `attach_auth_trunc`. The core of the logic seems to be around validating the requested truncation length for an authentication algorithm. I see that there are additional checks for `ualg->alg_trunc_len` which seems to be the user-specified truncation length. The original code only checked if `ualg->alg_trunc_len` exceeded `algo->uinfo.auth.icv_fullbits`, which is the maximum supported ICV (Integrity Check Value) length for the chosen algorithm.

Now, there are two new conditions. The first is a redundant length check, so that if the length is larger than the maximum ICV bits, the invalid length error is triggered. The second check ensures that the requested truncation length is byte-aligned (divisible by 8) and is at least 32 bits, but isn't over the maximum ICV length. This is to ensure that truncated ICVs are a reasonable size and don't end up being less than the minimum acceptable length of 32 bits. I need to keep in mind the potential impact on performance and security implications regarding truncated ICVs. I need to be sure that these conditions are correct, and aren't overly restrictive or create new vulnerabilities. The error messages make sense, but I'll make sure there aren't any potential misleading interactions with other parts of the codebase.

{
  "File": "net/xfrm/xfrm_user.c",
  "FirstLine": 680,
  "LineCount": 50
}

{
  "Contents": " 680:\t\n 681:\t\t*algpp = p;\n 682:\t\treturn 0;\n 683:\t}\n 684:\t\n 685:\tstatic int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,\n 686:\t\t\t\t     struct nlattr *rta, struct netlink_ext_ack *extack)\n 687:\t{\n 688:\t\tstruct xfrm_algo_auth *p, *ualg;\n 689:\t\tstruct xfrm_algo_desc *algo;\n 690:\t\n 691:\t\tif (!rta)\n 692:\t\t\treturn 0;\n 693:\t\n 694:\t\tualg = nla_data(rta);\n 695:\t\n 696:\t\talgo = xfrm_aalg_get_byname(ualg-\u003ealg_name, 1);\n 697:\t\tif (!algo) {\n 698:\t\t\tNL_SET_ERR_MSG(extack, \"Requested AUTH_TRUNC algorithm not found\");\n 699:\t\t\treturn -ENOSYS;\n 700:\t\t}\n 701:\t\tif (ualg-\u003ealg_trunc_len \u003e algo-\u003euinfo.auth.icv_fullbits ||\n 702:\t\t    (ualg-\u003ealg_trunc_len \u0026 7) ||\n 703:\t\t    (ualg-\u003ealg_trunc_len \u003e 0 \u0026\u0026 ualg-\u003ealg_trunc_len \u003c 32)) {\n 704:\t\t\tNL_SET_ERR_MSG(extack, \"Invalid length requested for truncated ICV\");\n 705:\t\t\treturn -EINVAL;\n 706:\t\t}\n 707:\t\t*props = algo-\u003edesc.sadb_alg_id;\n 708:\t\n 709:\t\tp = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);\n 710:\t\tif (!p)\n 711:\t\t\treturn -ENOMEM;\n 712:\t\n 713:\t\tstrscpy(p-\u003ealg_name, algo-\u003ename);\n 714:\t\tif (!p-\u003ealg_trunc_len)\n 715:\t\t\tp-\u003ealg_trunc_len = algo-\u003euinfo.auth.icv_truncbits;\n 716:\t\n 717:\t\t*algpp = p;\n 718:\t\treturn 0;\n 719:\t}\n 720:\t\n 721:\tstatic int attach_aead(struct xfrm_state *x, struct nlattr *rta,\n 722:\t\t\t       struct netlink_ext_ack *extack)\n 723:\t{\n 724:\t\tstruct xfrm_algo_aead *p, *ualg;\n 725:\t\tstruct xfrm_algo_desc *algo;\n 726:\t\n 727:\t\tif (!rta)\n 728:\t\t\treturn 0;\n 729:\t\n"
}

gemini-3.8-flash

null

null

							input: 3610
							output: 32
							thoughts: 35
						

Okay, here's my take on those thoughts, framed as an expert diving into the code:

**Diving into `attach_auth_trunc`**

Alright, time to get my hands dirty. I need to understand what this `attach_auth_trunc` function is all about, and more importantly, *why* it's been changed. My first move is clear: I need to quickly get up to speed. Let's start with a deep dive into the Git history. I'll search for the commit messages surrounding this function, or even better, if there's an associated bug ID referenced, I'll chase that down immediately. That's the key to understanding the motivation behind this patch and the specific issue it's meant to address. Understanding the context is paramount before I begin to consider the code's impact on a larger system.

{
  "Expression": "Invalid length requested for truncated ICV",
  "PathPrefix": "net/xfrm/"
}

{
  "Output": "net/xfrm/xfrm_user.c=685=static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,\n--\nnet/xfrm/xfrm_user.c-703-\t    (ualg-\u003ealg_trunc_len \u003e 0 \u0026\u0026 ualg-\u003ealg_trunc_len \u003c 32)) {\nnet/xfrm/xfrm_user.c:704:\t\tNL_SET_ERR_MSG(extack, \"Invalid length requested for truncated ICV\");\nnet/xfrm/xfrm_user.c-705-\t\treturn -EINVAL;\n"
}

gemini-3.8-flash

null

null

							input: 4019
							output: 30
							thoughts: 40
						

Okay, here's my interpretation of that thought process, as if it were my own:

**Investigating XFRM Userspace Interaction**

Right, I need to get a handle on the context surrounding `attach_auth_trunc` or `icv_fullbits` within the `net/xfrm/xfrm_user.c` file. My plan is to use `git log` to dig into the commit history of that specific file. By tracing the evolution of the code around those particular function names or variables, I'm hoping to build a comprehensive understanding of the surrounding logic. I'm especially interested in figuring out how user-space interacts with these components. Essentially, I want to see *why* this part of the code exists, *how* it's been changed, and *what* surrounding issues or features are relevant, so I'm hoping this git log will help me build that bigger picture, and provide the background needed to understand it.

{
  "Expression": "icv_fullbits",
  "PathPrefix": "net/xfrm/"
}

{
  "Output": "net/xfrm/xfrm_algo.c=175=static struct xfrm_algo_desc aalg_list[] = {\n--\nnet/xfrm/xfrm_algo.c-181-\t\t\t.icv_truncbits = 0,\nnet/xfrm/xfrm_algo.c:182:\t\t\t.icv_fullbits = 0,\nnet/xfrm/xfrm_algo.c-183-\t\t}\n--\nnet/xfrm/xfrm_algo.c-201-\t\t\t.icv_truncbits = 96,\nnet/xfrm/xfrm_algo.c:202:\t\t\t.icv_fullbits = 128,\nnet/xfrm/xfrm_algo.c-203-\t\t}\n--\nnet/xfrm/xfrm_algo.c-221-\t\t\t.icv_truncbits = 96,\nnet/xfrm/xfrm_algo.c:222:\t\t\t.icv_fullbits = 160,\nnet/xfrm/xfrm_algo.c-223-\t\t}\n--\nnet/xfrm/xfrm_algo.c-241-\t\t\t.icv_truncbits = 96,\nnet/xfrm/xfrm_algo.c:242:\t\t\t.icv_fullbits = 256,\nnet/xfrm/xfrm_algo.c-243-\t\t}\n--\nnet/xfrm/xfrm_algo.c-260-\t\t\t.icv_truncbits = 192,\nnet/xfrm/xfrm_algo.c:261:\t\t\t.icv_fullbits = 384,\nnet/xfrm/xfrm_algo.c-262-\t\t}\n--\nnet/xfrm/xfrm_algo.c-279-\t\t\t.icv_truncbits = 256,\nnet/xfrm/xfrm_algo.c:280:\t\t\t.icv_fullbits = 512,\nnet/xfrm/xfrm_algo.c-281-\t\t}\n--\nnet/xfrm/xfrm_algo.c-298-\t\t\t.icv_truncbits = 96,\nnet/xfrm/xfrm_algo.c:299:\t\t\t.icv_fullbits = 128,\nnet/xfrm/xfrm_algo.c-300-\t\t}\n--\nnet/xfrm/xfrm_algo.c-318-\t\t\t.icv_truncbits = 96,\nnet/xfrm/xfrm_algo.c:319:\t\t\t.icv_fullbits = 128,\nnet/xfrm/xfrm_algo.c-320-\t\t}\n--\nnet/xfrm/xfrm_algo.c-331-\t\t\t.icv_truncbits = 256,\nnet/xfrm/xfrm_algo.c:332:\t\t\t.icv_fullbits = 256,\nnet/xfrm/xfrm_algo.c-333-\t\t}\n--\nnet/xfrm/xfrm_user.c=685=static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,\n--\nnet/xfrm/xfrm_user.c-700-\t}\nnet/xfrm/xfrm_user.c:701:\tif (ualg-\u003ealg_trunc_len \u003e algo-\u003euinfo.auth.icv_fullbits ||\nnet/xfrm/xfrm_user.c-702-\t    (ualg-\u003ealg_trunc_len \u0026 7) ||\n"
}

gemini-3.8-flash

null

null

							input: 5195
							output: 27
							thoughts: 18
						

Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Investigating `alg_trunc_len` Usage**

Okay, time to dig into the kernel's implementation. My primary objective is to understand the context and purpose of `alg_trunc_len`. I'm starting by tracing its usage within the kernel source code. I need to quickly identify all the places where this variable is being accessed, both reads and writes. This will give me a solid map of the dependencies and potential implications of any modifications I might make to the variable, the data it points to, or any related function. Knowing the calling context is key to avoiding unforeseen consequences in the subsystems that make use of it. I'll be looking specifically for any usage in cryptographic operations, but I won't rule out more general purpose applications immediately, given that the function name doesn't specify its field of application.

{
  "Expression": "alg_trunc_len",
  "PathPrefix": "net/"
}

{
  "Output": "net/ipv4/ah4.c=481=static int ah_init_state(struct xfrm_state *x, struct netlink_ext_ack *extack)\n--\nnet/ipv4/ah4.c-529-\tahp-\u003eicv_full_len = aalg_desc-\u003euinfo.auth.icv_fullbits/8;\nnet/ipv4/ah4.c:530:\tahp-\u003eicv_trunc_len = x-\u003eaalg-\u003ealg_trunc_len/8;\nnet/ipv4/ah4.c-531-\n--\nnet/ipv4/esp4.c=1023=static int esp_init_authenc(struct xfrm_state *x,\n--\nnet/ipv4/esp4.c-1098-\t\terr = crypto_aead_setauthsize(\nnet/ipv4/esp4.c:1099:\t\t\taead, x-\u003eaalg-\u003ealg_trunc_len / 8);\nnet/ipv4/esp4.c-1100-\t\tif (err) {\n--\nnet/ipv6/ah6.c=695=static int ah6_init_state(struct xfrm_state *x, struct netlink_ext_ack *extack)\n--\nnet/ipv6/ah6.c-743-\tahp-\u003eicv_full_len = aalg_desc-\u003euinfo.auth.icv_fullbits/8;\nnet/ipv6/ah6.c:744:\tahp-\u003eicv_trunc_len = x-\u003eaalg-\u003ealg_trunc_len/8;\nnet/ipv6/ah6.c-745-\n--\nnet/ipv6/esp6.c=1061=static int esp_init_authenc(struct xfrm_state *x,\n--\nnet/ipv6/esp6.c-1136-\t\terr = crypto_aead_setauthsize(\nnet/ipv6/esp6.c:1137:\t\t\taead, x-\u003eaalg-\u003ealg_trunc_len / 8);\nnet/ipv6/esp6.c-1138-\t\tif (err) {\n--\nnet/key/af_key.c=1075=static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,\n--\nnet/key/af_key.c-1203-\t\t}\nnet/key/af_key.c:1204:\t\tx-\u003eaalg-\u003ealg_trunc_len = a-\u003euinfo.auth.icv_truncbits;\nnet/key/af_key.c-1205-\t\tx-\u003eprops.aalgo = sa-\u003esadb_sa_auth;\n--\nnet/xfrm/xfrm_user.c=653=static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,\n--\nnet/xfrm/xfrm_user.c-677-\tp-\u003ealg_key_len = ualg-\u003ealg_key_len;\nnet/xfrm/xfrm_user.c:678:\tp-\u003ealg_trunc_len = algo-\u003euinfo.auth.icv_truncbits;\nnet/xfrm/xfrm_user.c-679-\tmemcpy(p-\u003ealg_key, ualg-\u003ealg_key, (ualg-\u003ealg_key_len + 7) / 8);\n--\nnet/xfrm/xfrm_user.c=685=static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,\n--\nnet/xfrm/xfrm_user.c-700-\t}\nnet/xfrm/xfrm_user.c:701:\tif (ualg-\u003ealg_trunc_len \u003e algo-\u003euinfo.auth.icv_fullbits ||\nnet/xfrm/xfrm_user.c:702:\t    (ualg-\u003ealg_trunc_len \u0026 7) ||\nnet/xfrm/xfrm_user.c:703:\t    (ualg-\u003ealg_trunc_len \u003e 0 \u0026\u0026 ualg-\u003ealg_trunc_len \u003c 32)) {\nnet/xfrm/xfrm_user.c-704-\t\tNL_SET_ERR_MSG(extack, \"Invalid length requested for truncated ICV\");\n--\nnet/xfrm/xfrm_user.c-713-\tstrscpy(p-\u003ealg_name, algo-\u003ename);\nnet/xfrm/xfrm_user.c:714:\tif (!p-\u003ealg_trunc_len)\nnet/xfrm/xfrm_user.c:715:\t\tp-\u003ealg_trunc_len = algo-\u003euinfo.auth.icv_truncbits;\nnet/xfrm/xfrm_user.c-716-\n--\nnet/xfrm/xfrm_user.c=1258=static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)\n--\nnet/xfrm/xfrm_user.c-1284-\tap-\u003ealg_key_len = auth-\u003ealg_key_len;\nnet/xfrm/xfrm_user.c:1285:\tap-\u003ealg_trunc_len = auth-\u003ealg_trunc_len;\nnet/xfrm/xfrm_user.c-1286-\tif (redact_secret \u0026\u0026 auth-\u003ealg_key_len)\n"
}

gemini-3.8-flash

null

null

							input: 6768
							output: 37
							thoughts: 75
						

Here's my analysis of what I'm thinking about concerning the code snippets:

**Digging into ICV Truncation and AH Initialization**

Okay, so I'm focusing on the interaction between a few key files here: `ah4.c`, `ah6.c`, `esp4.c`, and `esp6.c`. The core question revolves around how the `icv_trunc_len` variable is derived, specifically, how it's calculated using `x->aalg->alg_trunc_len / 8`. I need to figure out what that division by eight signifies in terms of the algorithm's truncation length. Is that conversion from bits to bytes? Or some other unit? I need to understand that relationship to truly grasp what's happening. I'm assuming, that this is the first step when the ICV is constructed.

To do that I need to zoom in to `ah_init_state` within `net/ipv4/ah4.c`. I need to see how the AH (Authentication Header) state is initialized and how `icv_trunc_len` comes into play at this stage of the process. I anticipate seeing the allocation of memory to store the ICV. I want to see if the value is passed to other functions as well. I'm anticipating some critical information on the truncation and padding of the ICV. This is where the rubber meets the road in terms of securing the IP packets, right? Let's get to it.

{
  "File": "net/ipv4/ah4.c",
  "FirstLine": 520,
  "LineCount": 40
}

{
  "Contents": " 520:\t\taalg_desc = xfrm_aalg_get_byname(x-\u003eaalg-\u003ealg_name, 0);\n 521:\t\tBUG_ON(!aalg_desc);\n 522:\t\n 523:\t\tif (aalg_desc-\u003euinfo.auth.icv_fullbits/8 !=\n 524:\t\t    crypto_ahash_digestsize(ahash)) {\n 525:\t\t\tNL_SET_ERR_MSG(extack, \"Kernel was unable to initialize cryptographic operations\");\n 526:\t\t\tgoto error;\n 527:\t\t}\n 528:\t\n 529:\t\tahp-\u003eicv_full_len = aalg_desc-\u003euinfo.auth.icv_fullbits/8;\n 530:\t\tahp-\u003eicv_trunc_len = x-\u003eaalg-\u003ealg_trunc_len/8;\n 531:\t\n 532:\t\tif (x-\u003eprops.flags \u0026 XFRM_STATE_ALIGN4)\n 533:\t\t\tx-\u003eprops.header_len = XFRM_ALIGN4(sizeof(struct ip_auth_hdr) +\n 534:\t\t\t\t\t\t\t  ahp-\u003eicv_trunc_len);\n 535:\t\telse\n 536:\t\t\tx-\u003eprops.header_len = XFRM_ALIGN8(sizeof(struct ip_auth_hdr) +\n 537:\t\t\t\t\t\t\t  ahp-\u003eicv_trunc_len);\n 538:\t\tif (x-\u003eprops.mode == XFRM_MODE_TUNNEL)\n 539:\t\t\tx-\u003eprops.header_len += sizeof(struct iphdr);\n 540:\t\tx-\u003edata = ahp;\n 541:\t\n 542:\t\treturn 0;\n 543:\t\n 544:\terror:\n 545:\t\tif (ahp) {\n 546:\t\t\tcrypto_free_ahash(ahp-\u003eahash);\n 547:\t\t\tkfree(ahp);\n 548:\t\t}\n 549:\t\treturn -EINVAL;\n 550:\t}\n 551:\t\n 552:\tstatic void ah_destroy(struct xfrm_state *x)\n 553:\t{\n 554:\t\tstruct ah_data *ahp = x-\u003edata;\n 555:\t\n 556:\t\tif (!ahp)\n 557:\t\t\treturn;\n 558:\t\n 559:\t\tcrypto_free_ahash(ahp-\u003eahash);\n"
}

gemini-3.8-flash

null

null

							input: 7846
							output: 37
							thoughts: 73
						

Here's my take on those thoughts:

**Analyzing Algorithm Truncation Length Discrepancies**

Okay, so I'm trying to pinpoint the root cause of these issues I'm seeing. Specifically, I need to figure out the behavior within `ah_output` or `ah_input` when the `alg_trunc_len` parameter deviates from my expected constraints. I'm focusing on scenarios where `alg_trunc_len` is either not a multiple of 8, or falls below the minimum accepted length of 32 (or ranges between 1 and 31, which is effectively the same constraint just expressed differently) – or maybe all those scenarios are related. Essentially, I'm trying to identify where things go sideways when the truncation length isn't "correct".

My hunch is that these non-standard truncation lengths might be leading to unexpected behavior. The immediate suspects are `ah_output` and `ah_input`, because that's where the length is used. But it might also be somewhere in the crypto layer, I suppose. I need to trace the data flow and understand how these lengths are handled at each stage to figure out where the discrepancy causes issues.

{
  "File": "net/ipv4/ah4.c",
  "FirstLine": 140,
  "LineCount": 70
}

{
  "Contents": " 140:\t\tif (top_iph-\u003eihl != 5) {\n 141:\t\t\ttop_iph-\u003edaddr = iph-\u003edaddr;\n 142:\t\t\tmemcpy(top_iph+1, iph+1, top_iph-\u003eihl*4 - sizeof(struct iphdr));\n 143:\t\t}\n 144:\t\n 145:\t\tkfree(AH_SKB_CB(skb)-\u003etmp);\n 146:\t\txfrm_output_resume(skb_to_full_sk(skb), skb, err);\n 147:\t}\n 148:\t\n 149:\tstatic int ah_output(struct xfrm_state *x, struct sk_buff *skb)\n 150:\t{\n 151:\t\tint err;\n 152:\t\tint nfrags;\n 153:\t\tint ihl;\n 154:\t\tu8 *icv;\n 155:\t\tstruct sk_buff *trailer;\n 156:\t\tstruct crypto_ahash *ahash;\n 157:\t\tstruct ahash_request *req;\n 158:\t\tstruct scatterlist *sg;\n 159:\t\tstruct iphdr *iph, *top_iph;\n 160:\t\tstruct ip_auth_hdr *ah;\n 161:\t\tstruct ah_data *ahp;\n 162:\t\tint seqhi_len = 0;\n 163:\t\t__be32 *seqhi;\n 164:\t\tint sglists = 0;\n 165:\t\tstruct scatterlist *seqhisg;\n 166:\t\n 167:\t\tahp = x-\u003edata;\n 168:\t\tahash = ahp-\u003eahash;\n 169:\t\n 170:\t\tif ((err = skb_cow_data(skb, 0, \u0026trailer)) \u003c 0)\n 171:\t\t\tgoto out;\n 172:\t\tnfrags = err;\n 173:\t\n 174:\t\tskb_push(skb, -skb_network_offset(skb));\n 175:\t\tah = ip_auth_hdr(skb);\n 176:\t\tihl = ip_hdrlen(skb);\n 177:\t\n 178:\t\tif (x-\u003eprops.flags \u0026 XFRM_STATE_ESN) {\n 179:\t\t\tsglists = 1;\n 180:\t\t\tseqhi_len = sizeof(*seqhi);\n 181:\t\t}\n 182:\t\terr = -ENOMEM;\n 183:\t\tiph = ah_alloc_tmp(ahash, nfrags + sglists, ihl + seqhi_len);\n 184:\t\tif (!iph)\n 185:\t\t\tgoto out;\n 186:\t\tseqhi = (__be32 *)((char *)iph + ihl);\n 187:\t\ticv = ah_tmp_icv(seqhi, seqhi_len);\n 188:\t\treq = ah_tmp_req(ahash, icv);\n 189:\t\tsg = ah_req_sg(ahash, req);\n 190:\t\tseqhisg = sg + nfrags;\n 191:\t\n 192:\t\tmemset(ah-\u003eauth_data, 0, ahp-\u003eicv_trunc_len);\n 193:\t\n 194:\t\ttop_iph = ip_hdr(skb);\n 195:\t\n 196:\t\tiph-\u003etos = top_iph-\u003etos;\n 197:\t\tiph-\u003ettl = top_iph-\u003ettl;\n 198:\t\tiph-\u003efrag_off = top_iph-\u003efrag_off;\n 199:\t\n 200:\t\tif (top_iph-\u003eihl != 5) {\n 201:\t\t\tiph-\u003edaddr = top_iph-\u003edaddr;\n 202:\t\t\tmemcpy(iph+1, top_iph+1, top_iph-\u003eihl*4 - sizeof(struct iphdr));\n 203:\t\t\terr = ip_clear_mutable_options(top_iph, \u0026top_iph-\u003edaddr);\n 204:\t\t\tif (err)\n 205:\t\t\t\tgoto out_free;\n 206:\t\t}\n 207:\t\n 208:\t\tah-\u003enexthdr = *skb_mac_header(skb);\n 209:\t\t*skb_mac_header(skb) = IPPROTO_AH;\n"
}

gemini-3.8-flash

null

null

							input: 9350
							output: 37
							thoughts: 16
						

Okay, here's my interpretation of that thought process, summarized as if it were my own:

**My Line of Reasoning**

Right, let's think this through. My focus is on the `ah_output_done` stage, or a similar point in the process. It's at this juncture that I'm likely concerned with... well, that's where the critical action happens. I need to figure out what's relevant to address *at that* stage, within the scope of this project, to resolve the problem.

{
  "File": "net/ipv4/ah4.c",
  "FirstLine": 115,
  "LineCount": 35
}

{
  "Contents": " 115:\t}\n 116:\t\n 117:\tstatic void ah_output_done(void *data, int err)\n 118:\t{\n 119:\t\tu8 *icv;\n 120:\t\tstruct iphdr *iph;\n 121:\t\tstruct sk_buff *skb = data;\n 122:\t\tstruct xfrm_state *x = skb_dst(skb)-\u003exfrm;\n 123:\t\tstruct ah_data *ahp = x-\u003edata;\n 124:\t\tstruct iphdr *top_iph = ip_hdr(skb);\n 125:\t\tstruct ip_auth_hdr *ah = ip_auth_hdr(skb);\n 126:\t\tint ihl = ip_hdrlen(skb);\n 127:\t\tint seqhi_len = 0;\n 128:\t\t__be32 *seqhi;\n 129:\t\n 130:\t\tif (x-\u003eprops.flags \u0026 XFRM_STATE_ESN)\n 131:\t\t\tseqhi_len = sizeof(*seqhi);\n 132:\t\tiph = AH_SKB_CB(skb)-\u003etmp;\n 133:\t\tseqhi = (__be32 *)((char *)iph + ihl);\n 134:\t\ticv = ah_tmp_icv(seqhi, seqhi_len);\n 135:\t\tmemcpy(ah-\u003eauth_data, icv, ahp-\u003eicv_trunc_len);\n 136:\t\n 137:\t\ttop_iph-\u003etos = iph-\u003etos;\n 138:\t\ttop_iph-\u003ettl = iph-\u003ettl;\n 139:\t\ttop_iph-\u003efrag_off = iph-\u003efrag_off;\n 140:\t\tif (top_iph-\u003eihl != 5) {\n 141:\t\t\ttop_iph-\u003edaddr = iph-\u003edaddr;\n 142:\t\t\tmemcpy(top_iph+1, iph+1, top_iph-\u003eihl*4 - sizeof(struct iphdr));\n 143:\t\t}\n 144:\t\n 145:\t\tkfree(AH_SKB_CB(skb)-\u003etmp);\n 146:\t\txfrm_output_resume(skb_to_full_sk(skb), skb, err);\n 147:\t}\n 148:\t\n 149:\tstatic int ah_output(struct xfrm_state *x, struct sk_buff *skb)\n"
}

gemini-3.8-flash

null

null

							input: 10152
							output: 24
							thoughts: 128
						

**Investigating a Potential Vulnerability**

Okay, here's what's on my mind. I'm wondering if a particular variable, `ualg->alg_trunc_len`, has been properly tested within syzkaller. Specifically, I'm trying to understand the reasoning behind a recent patch and its potential impact.

My initial thought is to examine how the `crypto_aead_setauthsize` function, or perhaps something related to ESP (Encapsulating Security Payload), interacts with `alg_trunc_len`. Let me dive into `esp4.c`. Ah, yes, there it is: `err = crypto_aead_setauthsize(aead, x->aalg->alg_trunc_len / 8);`. This is where the crucial link is.

Now, my key question is, what happens within `crypto_aead_setauthsize` when the provided authentication size, derived from `alg_trunc_len`, is outside of an expected range? I need to know the error handling here, and if this could be exploited somehow. Does this also apply to `authenc`? I should check `crypto/authenc.c` or something similar, for relevant code. I need to understand the bounds checks and error conditions very closely.

{
  "Expression": "authsize",
  "PathPrefix": "crypto/"
}

{
  "Output": "\nFull output is too long, showing 500 out of 927 lines.\nUse more precise expression if possible.\n\ncrypto/aead.c=63=EXPORT_SYMBOL_GPL(crypto_aead_setkey);\ncrypto/aead.c-64-\ncrypto/aead.c:65:int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)\ncrypto/aead.c-66-{\n--\ncrypto/aead.c-68-\ncrypto/aead.c:69:\tif ((!authsize \u0026\u0026 crypto_aead_maxauthsize(tfm)) ||\ncrypto/aead.c:70:\t    authsize \u003e crypto_aead_maxauthsize(tfm))\ncrypto/aead.c-71-\t\treturn -EINVAL;\ncrypto/aead.c-72-\ncrypto/aead.c:73:\tif (crypto_aead_alg(tfm)-\u003esetauthsize) {\ncrypto/aead.c:74:\t\terr = crypto_aead_alg(tfm)-\u003esetauthsize(tfm, authsize);\ncrypto/aead.c-75-\t\tif (err)\n--\ncrypto/aead.c-78-\ncrypto/aead.c:79:\ttfm-\u003eauthsize = authsize;\ncrypto/aead.c-80-\treturn 0;\ncrypto/aead.c-81-}\ncrypto/aead.c:82:EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);\ncrypto/aead.c-83-\n--\ncrypto/aead.c=95=int crypto_aead_decrypt(struct aead_request *req)\n--\ncrypto/aead.c-101-\ncrypto/aead.c:102:\tif (req-\u003ecryptlen \u003c crypto_aead_authsize(aead))\ncrypto/aead.c-103-\t\treturn -EINVAL;\n--\ncrypto/aead.c=117=static int crypto_aead_init_tfm(struct crypto_tfm *tfm)\n--\ncrypto/aead.c-124-\ncrypto/aead.c:125:\taead-\u003eauthsize = alg-\u003emaxauthsize;\ncrypto/aead.c-126-\n--\ncrypto/aead.c=136=static int __maybe_unused crypto_aead_report(\n--\ncrypto/aead.c-145-\traead.blocksize = alg-\u003ecra_blocksize;\ncrypto/aead.c:146:\traead.maxauthsize = aead-\u003emaxauthsize;\ncrypto/aead.c-147-\traead.ivsize = aead-\u003eivsize;\n--\ncrypto/aead.c=152=static void __maybe_unused crypto_aead_show(struct seq_file *m,\n--\ncrypto/aead.c-161-\tseq_printf(m, \"ivsize       : %u\\n\", aead-\u003eivsize);\ncrypto/aead.c:162:\tseq_printf(m, \"maxauthsize  : %u\\n\", aead-\u003emaxauthsize);\ncrypto/aead.c-163-\tseq_printf(m, \"geniv        : \u003cnone\u003e\\n\");\n--\ncrypto/aead.c=230=static int aead_prepare_alg(struct aead_alg *alg)\n--\ncrypto/aead.c-233-\ncrypto/aead.c:234:\tif (max3(alg-\u003emaxauthsize, alg-\u003eivsize, alg-\u003echunksize) \u003e\ncrypto/aead.c-235-\t    PAGE_SIZE / 8)\n--\ncrypto/aegis-neon.h=12=int crypto_aegis128_final_neon(void *state, void *tag_xor,\n--\ncrypto/aegis-neon.h-14-\t\t\t       unsigned int cryptlen,\ncrypto/aegis-neon.h:15:\t\t\t       unsigned int authsize);\ncrypto/aegis-neon.h-16-\n--\ncrypto/aegis.h=40=int crypto_aegis128_final_simd(struct aegis_state *state,\n--\ncrypto/aegis.h-43-\t\t\t       unsigned int cryptlen,\ncrypto/aegis.h:44:\t\t\t       unsigned int authsize);\ncrypto/aegis.h-45-\n--\ncrypto/aegis128-core.c=364=static int crypto_aegis128_setkey(struct crypto_aead *aead, const u8 *key,\n--\ncrypto/aegis128-core.c-375-\ncrypto/aegis128-core.c:376:static int crypto_aegis128_setauthsize(struct crypto_aead *tfm,\ncrypto/aegis128-core.c:377:\t\t\t\t       unsigned int authsize)\ncrypto/aegis128-core.c-378-{\ncrypto/aegis128-core.c:379:\tif (authsize \u003e AEGIS128_MAX_AUTH_SIZE)\ncrypto/aegis128-core.c-380-\t\treturn -EINVAL;\ncrypto/aegis128-core.c:381:\tif (authsize \u003c AEGIS128_MIN_AUTH_SIZE)\ncrypto/aegis128-core.c-382-\t\treturn -EINVAL;\n--\ncrypto/aegis128-core.c=386=static int crypto_aegis128_encrypt_generic(struct aead_request *req)\n--\ncrypto/aegis128-core.c-389-\tunion aegis_block tag = {};\ncrypto/aegis128-core.c:390:\tunsigned int authsize = crypto_aead_authsize(tfm);\ncrypto/aegis128-core.c-391-\tstruct aegis_ctx *ctx = crypto_aead_ctx(tfm);\n--\ncrypto/aegis128-core.c-403-\tscatterwalk_map_and_copy(tag.bytes, req-\u003edst, req-\u003eassoclen + cryptlen,\ncrypto/aegis128-core.c:404:\t\t\t\t authsize, 1);\ncrypto/aegis128-core.c-405-\treturn 0;\n--\ncrypto/aegis128-core.c=408=static int crypto_aegis128_decrypt_generic(struct aead_request *req)\n--\ncrypto/aegis128-core.c-412-\tunion aegis_block tag;\ncrypto/aegis128-core.c:413:\tunsigned int authsize = crypto_aead_authsize(tfm);\ncrypto/aegis128-core.c:414:\tunsigned int cryptlen = req-\u003ecryptlen - authsize;\ncrypto/aegis128-core.c-415-\tstruct aegis_ctx *ctx = crypto_aead_ctx(tfm);\n--\ncrypto/aegis128-core.c-419-\tscatterwalk_map_and_copy(tag.bytes, req-\u003esrc, req-\u003eassoclen + cryptlen,\ncrypto/aegis128-core.c:420:\t\t\t\t authsize, 0);\ncrypto/aegis128-core.c-421-\n--\ncrypto/aegis128-core.c-428-\ncrypto/aegis128-core.c:429:\tif (unlikely(crypto_memneq(tag.bytes, zeros, authsize))) {\ncrypto/aegis128-core.c-430-\t\t/*\n--\ncrypto/aegis128-core.c=447=static int crypto_aegis128_encrypt_simd(struct aead_request *req)\n--\ncrypto/aegis128-core.c-450-\tunion aegis_block tag = {};\ncrypto/aegis128-core.c:451:\tunsigned int authsize = crypto_aead_authsize(tfm);\ncrypto/aegis128-core.c-452-\tstruct aegis_ctx *ctx = crypto_aead_ctx(tfm);\n--\ncrypto/aegis128-core.c-467-\tscatterwalk_map_and_copy(tag.bytes, req-\u003edst, req-\u003eassoclen + cryptlen,\ncrypto/aegis128-core.c:468:\t\t\t\t authsize, 1);\ncrypto/aegis128-core.c-469-\treturn 0;\n--\ncrypto/aegis128-core.c=472=static int crypto_aegis128_decrypt_simd(struct aead_request *req)\n--\ncrypto/aegis128-core.c-475-\tunion aegis_block tag;\ncrypto/aegis128-core.c:476:\tunsigned int authsize = crypto_aead_authsize(tfm);\ncrypto/aegis128-core.c:477:\tunsigned int cryptlen = req-\u003ecryptlen - authsize;\ncrypto/aegis128-core.c-478-\tstruct aegis_ctx *ctx = crypto_aead_ctx(tfm);\n--\ncrypto/aegis128-core.c-485-\tscatterwalk_map_and_copy(tag.bytes, req-\u003esrc, req-\u003eassoclen + cryptlen,\ncrypto/aegis128-core.c:486:\t\t\t\t authsize, 0);\ncrypto/aegis128-core.c-487-\n--\ncrypto/aegis128-core.c-494-\tif (unlikely(crypto_aegis128_final_simd(\u0026state, \u0026tag, req-\u003eassoclen,\ncrypto/aegis128-core.c:495:\t\t\t\t\t\tcryptlen, authsize))) {\ncrypto/aegis128-core.c-496-\t\tskcipher_walk_aead_decrypt(\u0026walk, req, false);\n--\ncrypto/aegis128-core.c=504=static struct aead_alg crypto_aegis128_alg_generic = {\ncrypto/aegis128-core.c-505-\t.setkey\t\t\t= crypto_aegis128_setkey,\ncrypto/aegis128-core.c:506:\t.setauthsize\t\t= crypto_aegis128_setauthsize,\ncrypto/aegis128-core.c-507-\t.encrypt\t\t= crypto_aegis128_encrypt_generic,\n--\ncrypto/aegis128-core.c-510-\t.ivsize\t\t\t= AEGIS128_NONCE_SIZE,\ncrypto/aegis128-core.c:511:\t.maxauthsize\t\t= AEGIS128_MAX_AUTH_SIZE,\ncrypto/aegis128-core.c-512-\t.chunksize\t\t= AEGIS_BLOCK_SIZE,\n--\ncrypto/aegis128-core.c=522=static struct aead_alg crypto_aegis128_alg_simd = {\ncrypto/aegis128-core.c-523-\t.setkey\t\t\t= crypto_aegis128_setkey,\ncrypto/aegis128-core.c:524:\t.setauthsize\t\t= crypto_aegis128_setauthsize,\ncrypto/aegis128-core.c-525-\t.encrypt\t\t= crypto_aegis128_encrypt_simd,\n--\ncrypto/aegis128-core.c-528-\t.ivsize\t\t\t= AEGIS128_NONCE_SIZE,\ncrypto/aegis128-core.c:529:\t.maxauthsize\t\t= AEGIS128_MAX_AUTH_SIZE,\ncrypto/aegis128-core.c-530-\t.chunksize\t\t= AEGIS_BLOCK_SIZE,\n--\ncrypto/aegis128-neon-inner.c=315=int crypto_aegis128_final_neon(void *state, void *tag_xor,\n--\ncrypto/aegis128-neon-inner.c-317-\t\t\t       unsigned int cryptlen,\ncrypto/aegis128-neon-inner.c:318:\t\t\t       unsigned int authsize)\ncrypto/aegis128-neon-inner.c-319-{\n--\ncrypto/aegis128-neon-inner.c-333-\ncrypto/aegis128-neon-inner.c:334:\tif (authsize \u003e 0) {\ncrypto/aegis128-neon-inner.c-335-\t\tv = vqtbl1q_u8(~vceqq_u8(v, vld1q_u8(tag_xor)),\ncrypto/aegis128-neon-inner.c:336:\t\t\t       vld1q_u8(permute + authsize));\ncrypto/aegis128-neon-inner.c-337-\n--\ncrypto/aegis128-neon.c=51=int crypto_aegis128_final_simd(struct aegis_state *state,\n--\ncrypto/aegis128-neon.c-54-\t\t\t       unsigned int cryptlen,\ncrypto/aegis128-neon.c:55:\t\t\t       unsigned int authsize)\ncrypto/aegis128-neon.c-56-{\n--\ncrypto/aegis128-neon.c-58-\t\treturn crypto_aegis128_final_neon(state, tag_xor, assoclen,\ncrypto/aegis128-neon.c:59:\t\t\t\t\t\t  cryptlen, authsize);\ncrypto/aegis128-neon.c-60-}\n--\ncrypto/aes.c=710=static __maybe_unused int crypto_aes_gcm_setkey(struct crypto_aead *tfm,\n--\ncrypto/aes.c-716-\treturn aes_gcm_preparekey(key, in_key, key_len,\ncrypto/aes.c:717:\t\t\t\t  crypto_aead_authsize(tfm));\ncrypto/aes.c-718-}\ncrypto/aes.c-719-\ncrypto/aes.c:720:static __maybe_unused int crypto_aes_gcm_setauthsize(struct crypto_aead *tfm,\ncrypto/aes.c:721:\t\t\t\t\t\t     unsigned int authsize)\ncrypto/aes.c-722-{\n--\ncrypto/aes.c-724-\ncrypto/aes.c:725:\tif (crypto_gcm_check_authsize(authsize) != 0)\ncrypto/aes.c-726-\t\treturn -EINVAL;\ncrypto/aes.c-727-\t/* Synchronize the tag length to the struct aes_gcm_key. */\ncrypto/aes.c:728:\tkey-\u003eauthtag_len = authsize;\ncrypto/aes.c-729-\treturn 0;\n--\ncrypto/aes.c=816=static __maybe_unused int crypto_aes_rfc4106_setkey(struct crypto_aead *tfm,\n--\ncrypto/aes.c-828-\treturn aes_gcm_preparekey(\u0026key-\u003egcm, in_key, key_len,\ncrypto/aes.c:829:\t\t\t\t  crypto_aead_authsize(tfm));\ncrypto/aes.c-830-}\n--\ncrypto/aes.c=832=static __maybe_unused int\ncrypto/aes.c:833:crypto_aes_rfc4106_setauthsize(struct crypto_aead *tfm, unsigned int authsize)\ncrypto/aes.c-834-{\n--\ncrypto/aes.c-836-\ncrypto/aes.c:837:\tif (crypto_rfc4106_check_authsize(authsize) != 0)\ncrypto/aes.c-838-\t\treturn -EINVAL;\n--\ncrypto/aes.c-840-\t/* Synchronize the tag length to the struct aes_gcm_key. */\ncrypto/aes.c:841:\tkey-\u003egcm.authtag_len = authsize;\ncrypto/aes.c-842-\treturn 0;\n--\ncrypto/aes.c=877=static __maybe_unused int crypto_aes_ccm_setkey(struct crypto_aead *tfm,\n--\ncrypto/aes.c-883-\treturn aes_ccm_preparekey(key, in_key, key_len,\ncrypto/aes.c:884:\t\t\t\t  crypto_aead_authsize(tfm));\ncrypto/aes.c-885-}\ncrypto/aes.c-886-\ncrypto/aes.c:887:static __maybe_unused int crypto_aes_ccm_setauthsize(struct crypto_aead *tfm,\ncrypto/aes.c:888:\t\t\t\t\t\t     unsigned int authsize)\ncrypto/aes.c-889-{\n--\ncrypto/aes.c-891-\ncrypto/aes.c:892:\tif (authsize \u003c 4 || authsize \u003e 16 || authsize % 2)\ncrypto/aes.c-893-\t\treturn -EINVAL;\ncrypto/aes.c-894-\t/* Synchronize the tag length to the struct aes_ccm_key. */\ncrypto/aes.c:895:\tkey-\u003eauthtag_len = authsize;\ncrypto/aes.c-896-\treturn 0;\n--\ncrypto/aes.c=982=static struct aead_alg aead_algs[] = {\n--\ncrypto/aes.c-991-\t\t.setkey = crypto_aes_gcm_setkey,\ncrypto/aes.c:992:\t\t.setauthsize = crypto_aes_gcm_setauthsize,\ncrypto/aes.c-993-\t\t.encrypt = crypto_aes_gcm_encrypt,\n--\ncrypto/aes.c-995-\t\t.ivsize = GCM_AES_IV_SIZE,\ncrypto/aes.c:996:\t\t.maxauthsize = AES_BLOCK_SIZE,\ncrypto/aes.c-997-\t\t.chunksize = AES_BLOCK_SIZE,\n--\ncrypto/aes.c-1006-\t\t.setkey = crypto_aes_rfc4106_setkey,\ncrypto/aes.c:1007:\t\t.setauthsize = crypto_aes_rfc4106_setauthsize,\ncrypto/aes.c-1008-\t\t.encrypt = crypto_aes_rfc4106_encrypt,\n--\ncrypto/aes.c-1010-\t\t.ivsize = GCM_RFC4106_IV_SIZE,\ncrypto/aes.c:1011:\t\t.maxauthsize = AES_BLOCK_SIZE,\ncrypto/aes.c-1012-\t\t.chunksize = AES_BLOCK_SIZE,\n--\ncrypto/aes.c-1023-\t\t.setkey = crypto_aes_ccm_setkey,\ncrypto/aes.c:1024:\t\t.setauthsize = crypto_aes_ccm_setauthsize,\ncrypto/aes.c-1025-\t\t.encrypt = crypto_aes_ccm_encrypt,\n--\ncrypto/aes.c-1027-\t\t.ivsize = 16,\ncrypto/aes.c:1028:\t\t.maxauthsize = 16,\ncrypto/aes.c-1029-\t\t.chunksize = AES_BLOCK_SIZE,\n--\ncrypto/af_alg.c=411=static int alg_setsockopt(struct socket *sock, int level, int optname,\n--\ncrypto/af_alg.c-444-\t\t\tgoto unlock;\ncrypto/af_alg.c:445:\t\tif (!type-\u003esetauthsize)\ncrypto/af_alg.c-446-\t\t\tgoto unlock;\ncrypto/af_alg.c:447:\t\terr = type-\u003esetauthsize(ask-\u003eprivate, optlen);\ncrypto/af_alg.c-448-\t\tbreak;\n--\ncrypto/algif_aead.c=42=static inline bool aead_sufficient_data(struct sock *sk)\n--\ncrypto/algif_aead.c-48-\tstruct crypto_aead *tfm = pask-\u003eprivate;\ncrypto/algif_aead.c:49:\tunsigned int as = crypto_aead_authsize(tfm);\ncrypto/algif_aead.c-50-\n--\ncrypto/algif_aead.c=70=static int _aead_recvmsg(struct socket *sock, struct msghdr *msg,\n--\ncrypto/algif_aead.c-78-\tstruct crypto_aead *tfm = pask-\u003eprivate;\ncrypto/algif_aead.c:79:\tunsigned int as = crypto_aead_authsize(tfm);\ncrypto/algif_aead.c-80-\tunsigned int ivsize = crypto_aead_ivsize(tfm);\n--\ncrypto/algif_aead.c=361=static void aead_release(void *private)\n--\ncrypto/algif_aead.c-365-\ncrypto/algif_aead.c:366:static int aead_setauthsize(void *private, unsigned int authsize)\ncrypto/algif_aead.c-367-{\ncrypto/algif_aead.c:368:\treturn crypto_aead_setauthsize(private, authsize);\ncrypto/algif_aead.c-369-}\n--\ncrypto/algif_aead.c=432=static const struct af_alg_type algif_type_aead = {\n--\ncrypto/algif_aead.c-435-\t.setkey\t\t=\taead_setkey,\ncrypto/algif_aead.c:436:\t.setauthsize\t=\taead_setauthsize,\ncrypto/algif_aead.c-437-\t.accept\t\t=\taead_accept_parent,\n--\ncrypto/authenc.c=110=static void authenc_geniv_ahash_finish(struct aead_request *req)\n--\ncrypto/authenc.c-119-\t\t\t\t req-\u003eassoclen + req-\u003ecryptlen,\ncrypto/authenc.c:120:\t\t\t\t crypto_aead_authsize(authenc), 1);\ncrypto/authenc.c-121-}\n--\ncrypto/authenc.c=145=static int crypto_authenc_genicv(struct aead_request *req, unsigned int mask)\n--\ncrypto/authenc.c-169-\tscatterwalk_map_and_copy(hash, req-\u003edst, req-\u003eassoclen + req-\u003ecryptlen,\ncrypto/authenc.c:170:\t\t\t\t crypto_aead_authsize(authenc), 1);\ncrypto/authenc.c-171-\n--\ncrypto/authenc.c=228=static int crypto_authenc_decrypt_tail(struct aead_request *req,\n--\ncrypto/authenc.c-238-\t\t\t\t\t\t  ictx-\u003ereqoff);\ncrypto/authenc.c:239:\tunsigned int authsize = crypto_aead_authsize(authenc);\ncrypto/authenc.c-240-\tunsigned int flags = aead_request_flags(req) \u0026 ~mask;\ncrypto/authenc.c:241:\tu8 *ihash = ahreq-\u003eresult + authsize;\ncrypto/authenc.c-242-\tstruct scatterlist *src, *dst;\ncrypto/authenc.c-243-\ncrypto/authenc.c:244:\tscatterwalk_map_and_copy(ihash, req-\u003esrc, ahreq-\u003enbytes, authsize, 0);\ncrypto/authenc.c-245-\ncrypto/authenc.c:246:\tif (crypto_memneq(ihash, ahreq-\u003eresult, authsize))\ncrypto/authenc.c-247-\t\treturn -EBADMSG;\n--\ncrypto/authenc.c-260-\tskcipher_request_set_crypt(skreq, src, dst,\ncrypto/authenc.c:261:\t\t\t\t   req-\u003ecryptlen - authsize, req-\u003eiv);\ncrypto/authenc.c-262-\n--\ncrypto/authenc.c=278=static int crypto_authenc_decrypt(struct aead_request *req)\n--\ncrypto/authenc.c-280-\tstruct crypto_aead *authenc = crypto_aead_reqtfm(req);\ncrypto/authenc.c:281:\tunsigned int authsize = crypto_aead_authsize(authenc);\ncrypto/authenc.c-282-\tstruct aead_instance *inst = aead_alg_instance(authenc);\n--\ncrypto/authenc.c-292-\tahash_request_set_crypt(ahreq, req-\u003esrc, hash,\ncrypto/authenc.c:293:\t\t\t\treq-\u003eassoclen + req-\u003ecryptlen - authsize);\ncrypto/authenc.c-294-\tahash_request_set_callback(ahreq, aead_request_flags(req),\n--\ncrypto/authenc.c=359=static int crypto_authenc_create(struct crypto_template *tmpl,\n--\ncrypto/authenc.c-413-\tinst-\u003ealg.chunksize = enc-\u003echunksize;\ncrypto/authenc.c:414:\tinst-\u003ealg.maxauthsize = auth-\u003edigestsize;\ncrypto/authenc.c-415-\n--\ncrypto/authencesn.c=41=static void authenc_esn_request_complete(struct aead_request *req, int err)\n--\ncrypto/authencesn.c-46-\ncrypto/authencesn.c:47:static int crypto_authenc_esn_setauthsize(struct crypto_aead *authenc_esn,\ncrypto/authencesn.c:48:\t\t\t\t\t  unsigned int authsize)\ncrypto/authencesn.c-49-{\ncrypto/authencesn.c:50:\tif (authsize \u003e 0 \u0026\u0026 authsize \u003c 4)\ncrypto/authencesn.c-51-\t\treturn -EINVAL;\n--\ncrypto/authencesn.c=84=static int crypto_authenc_esn_genicv_tail(struct aead_request *req,\n--\ncrypto/authencesn.c-89-\tu8 *hash = areq_ctx-\u003etail;\ncrypto/authencesn.c:90:\tunsigned int authsize = crypto_aead_authsize(authenc_esn);\ncrypto/authencesn.c-91-\tunsigned int assoclen = req-\u003eassoclen;\n--\ncrypto/authencesn.c-100-\ncrypto/authencesn.c:101:\tmemcpy_to_sglist(dst, assoclen + cryptlen, hash, authsize);\ncrypto/authencesn.c-102-\treturn 0;\n--\ncrypto/authencesn.c=113=static int crypto_authenc_esn_genicv(struct aead_request *req,\n--\ncrypto/authencesn.c-121-\tstruct ahash_request *ahreq = (void *)(areq_ctx-\u003etail + ctx-\u003ereqoff);\ncrypto/authencesn.c:122:\tunsigned int authsize = crypto_aead_authsize(authenc_esn);\ncrypto/authencesn.c-123-\tunsigned int assoclen = req-\u003eassoclen;\n--\ncrypto/authencesn.c-127-\ncrypto/authencesn.c:128:\tif (!authsize)\ncrypto/authencesn.c-129-\t\treturn 0;\n--\ncrypto/authencesn.c=197=static int crypto_authenc_esn_decrypt_tail(struct aead_request *req,\n--\ncrypto/authencesn.c-200-\tstruct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);\ncrypto/authencesn.c:201:\tunsigned int authsize = crypto_aead_authsize(authenc_esn);\ncrypto/authencesn.c-202-\tstruct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);\n--\ncrypto/authencesn.c-207-\tu8 *ohash = areq_ctx-\u003etail;\ncrypto/authencesn.c:208:\tunsigned int cryptlen = req-\u003ecryptlen - authsize;\ncrypto/authencesn.c-209-\tunsigned int assoclen = req-\u003eassoclen;\n--\ncrypto/authencesn.c-214-\ncrypto/authencesn.c:215:\tif (!authsize)\ncrypto/authencesn.c-216-\t\tgoto decrypt;\n--\ncrypto/authencesn.c-225-\ncrypto/authencesn.c:226:\tif (crypto_memneq(ihash, ohash, authsize))\ncrypto/authencesn.c-227-\t\treturn -EBADMSG;\n--\ncrypto/authencesn.c=253=static int crypto_authenc_esn_decrypt(struct aead_request *req)\n--\ncrypto/authencesn.c-258-\tstruct ahash_request *ahreq = (void *)(areq_ctx-\u003etail + ctx-\u003ereqoff);\ncrypto/authencesn.c:259:\tunsigned int authsize = crypto_aead_authsize(authenc_esn);\ncrypto/authencesn.c-260-\tstruct crypto_ahash *auth = ctx-\u003eauth;\n--\ncrypto/authencesn.c-272-\ncrypto/authencesn.c:273:\tif (!authsize)\ncrypto/authencesn.c-274-\t\tgoto tail;\ncrypto/authencesn.c-275-\ncrypto/authencesn.c:276:\tcryptlen -= authsize;\ncrypto/authencesn.c:277:\tmemcpy_from_sglist(ihash, req-\u003esrc, assoclen + cryptlen, authsize);\ncrypto/authencesn.c-278-\n--\ncrypto/authencesn.c=365=static int crypto_authenc_esn_create(struct crypto_template *tmpl,\n--\ncrypto/authencesn.c-421-\tinst-\u003ealg.chunksize = enc-\u003echunksize;\ncrypto/authencesn.c:422:\tinst-\u003ealg.maxauthsize = auth-\u003edigestsize;\ncrypto/authencesn.c-423-\n--\ncrypto/authencesn.c-427-\tinst-\u003ealg.setkey = crypto_authenc_esn_setkey;\ncrypto/authencesn.c:428:\tinst-\u003ealg.setauthsize = crypto_authenc_esn_setauthsize;\ncrypto/authencesn.c-429-\tinst-\u003ealg.encrypt = crypto_authenc_esn_encrypt;\n--\ncrypto/ccm.c=84=static int crypto_ccm_setkey(struct crypto_aead *aead, const u8 *key,\n--\ncrypto/ccm.c-104-\ncrypto/ccm.c:105:static int crypto_ccm_setauthsize(struct crypto_aead *tfm,\ncrypto/ccm.c:106:\t\t\t\t  unsigned int authsize)\ncrypto/ccm.c-107-{\ncrypto/ccm.c:108:\tswitch (authsize) {\ncrypto/ccm.c-109-\tcase 4:\n--\ncrypto/ccm.c=124=static int format_input(u8 *info, struct aead_request *req,\n--\ncrypto/ccm.c-131-\ncrypto/ccm.c:132:\tm = crypto_aead_authsize(aead);\ncrypto/ccm.c-133-\n--\ncrypto/ccm.c=224=static void crypto_ccm_encrypt_done(void *data, int err)\n--\ncrypto/ccm.c-233-\t\t\t\t\t req-\u003eassoclen + req-\u003ecryptlen,\ncrypto/ccm.c:234:\t\t\t\t\t crypto_aead_authsize(aead), 1);\ncrypto/ccm.c-235-\taead_request_complete(req, err);\n--\ncrypto/ccm.c=282=static int crypto_ccm_encrypt(struct aead_request *req)\n--\ncrypto/ccm.c-315-\tscatterwalk_map_and_copy(odata, sg_next(dst), cryptlen,\ncrypto/ccm.c:316:\t\t\t\t crypto_aead_authsize(aead), 1);\ncrypto/ccm.c-317-\treturn err;\n--\ncrypto/ccm.c=320=static void crypto_ccm_decrypt_done(void *data, int err)\n--\ncrypto/ccm.c-324-\tstruct crypto_aead *aead = crypto_aead_reqtfm(req);\ncrypto/ccm.c:325:\tunsigned int authsize = crypto_aead_authsize(aead);\ncrypto/ccm.c:326:\tunsigned int cryptlen = req-\u003ecryptlen - authsize;\ncrypto/ccm.c-327-\tstruct scatterlist *dst;\n--\ncrypto/ccm.c-334-\t\terr = crypto_ccm_auth(req, dst, cryptlen);\ncrypto/ccm.c:335:\t\tif (!err \u0026\u0026 crypto_memneq(pctx-\u003eauth_tag, pctx-\u003eodata, authsize))\ncrypto/ccm.c-336-\t\t\terr = -EBADMSG;\n--\ncrypto/ccm.c=341=static int crypto_ccm_decrypt(struct aead_request *req)\n--\ncrypto/ccm.c-347-\tstruct scatterlist *dst;\ncrypto/ccm.c:348:\tunsigned int authsize = crypto_aead_authsize(aead);\ncrypto/ccm.c-349-\tunsigned int cryptlen = req-\u003ecryptlen;\n--\ncrypto/ccm.c-354-\ncrypto/ccm.c:355:\tcryptlen -= authsize;\ncrypto/ccm.c-356-\n--\ncrypto/ccm.c-361-\tscatterwalk_map_and_copy(authtag, sg_next(pctx-\u003esrc), cryptlen,\ncrypto/ccm.c:362:\t\t\t\t authsize, 0);\ncrypto/ccm.c-363-\n--\ncrypto/ccm.c-382-\t/* verify */\ncrypto/ccm.c:383:\tif (crypto_memneq(authtag, odata, authsize))\ncrypto/ccm.c-384-\t\treturn -EBADMSG;\n--\ncrypto/ccm.c=442=static int crypto_ccm_create_common(struct crypto_template *tmpl,\n--\ncrypto/ccm.c-505-\tinst-\u003ealg.chunksize = ctr-\u003echunksize;\ncrypto/ccm.c:506:\tinst-\u003ealg.maxauthsize = 16;\ncrypto/ccm.c-507-\tinst-\u003ealg.base.cra_ctxsize = sizeof(struct crypto_ccm_ctx);\n--\ncrypto/ccm.c-510-\tinst-\u003ealg.setkey = crypto_ccm_setkey;\ncrypto/ccm.c:511:\tinst-\u003ealg.setauthsize = crypto_ccm_setauthsize;\ncrypto/ccm.c-512-\tinst-\u003ealg.encrypt = crypto_ccm_encrypt;\n--\ncrypto/ccm.c=563=static int crypto_rfc4309_setkey(struct crypto_aead *parent, const u8 *key,\n--\ncrypto/ccm.c-580-\ncrypto/ccm.c:581:static int crypto_rfc4309_setauthsize(struct crypto_aead *parent,\ncrypto/ccm.c:582:\t\t\t\t      unsigned int authsize)\ncrypto/ccm.c-583-{\n--\ncrypto/ccm.c-585-\ncrypto/ccm.c:586:\tswitch (authsize) {\ncrypto/ccm.c-587-\tcase 8:\n--\ncrypto/ccm.c-594-\ncrypto/ccm.c:595:\treturn crypto_aead_setauthsize(ctx-\u003echild, authsize);\ncrypto/ccm.c-596-}\n--\ncrypto/ccm.c=700=static int crypto_rfc4309_create(struct crypto_template *tmpl,\n--\ncrypto/ccm.c-749-\tinst-\u003ealg.chunksize = crypto_aead_alg_chunksize(alg);\ncrypto/ccm.c:750:\tinst-\u003ealg.maxauthsize = crypto_aead_alg_maxauthsize(alg);\ncrypto/ccm.c-751-\n--\ncrypto/ccm.c-757-\tinst-\u003ealg.setkey = crypto_rfc4309_setkey;\ncrypto/ccm.c:758:\tinst-\u003ealg.setauthsize = crypto_rfc4309_setauthsize;\ncrypto/ccm.c-759-\tinst-\u003ealg.encrypt = crypto_rfc4309_encrypt;\n--\ncrypto/chacha20poly1305.c=303=static int chachapoly_setkey(struct crypto_aead *aead, const u8 *key,\n--\ncrypto/chacha20poly1305.c-319-\ncrypto/chacha20poly1305.c:320:static int chachapoly_setauthsize(struct crypto_aead *tfm,\ncrypto/chacha20poly1305.c:321:\t\t\t\t  unsigned int authsize)\ncrypto/chacha20poly1305.c-322-{\ncrypto/chacha20poly1305.c:323:\tif (authsize != POLY1305_DIGEST_SIZE)\ncrypto/chacha20poly1305.c-324-\t\treturn -EINVAL;\n--\ncrypto/chacha20poly1305.c=371=static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb,\n--\ncrypto/chacha20poly1305.c-433-\tinst-\u003ealg.chunksize = chacha-\u003echunksize;\ncrypto/chacha20poly1305.c:434:\tinst-\u003ealg.maxauthsize = POLY1305_DIGEST_SIZE;\ncrypto/chacha20poly1305.c-435-\tinst-\u003ealg.init = chachapoly_init;\n--\ncrypto/chacha20poly1305.c-439-\tinst-\u003ealg.setkey = chachapoly_setkey;\ncrypto/chacha20poly1305.c:440:\tinst-\u003ealg.setauthsize = chachapoly_setauthsize;\n\n"
}

gemini-3.8-flash

null

null

							input: 20553
							output: 21
							thoughts: 1168
						

**Unraveling a Potential Security Flaw in XFRM Authentication**

Okay, I need to understand this patch and what vulnerability it's addressing. My initial thought process starts with the code itself. I'm looking at `crypto/authencesn.c` and immediately the check `authsize < 4` is grabbing my attention. This implies that the authentication size, in bytes, is limited, which translates to a bit limit of less than 32 bits. I need to understand the implications of this. I need to see where this `authsize` is used. I'll switch over to `crypto/authenc.c`.

Wait, what are the relevant implications of the code in `crypto/authenc.c`? Where is `authsize` used? I see it in `authenc_geniv_ahash_finish` with `scatterwalk_map_and_copy`, and also in `crypto_authenc_decrypt_tail` with `u8 *ihash = ahreq->result + authsize;`.

What about `crypto_authenc_genicv`? And what happens when `ualg->alg_trunc_len & 7` is non-zero? In `ah4.c`, `ahp->icv_trunc_len = x->aalg->alg_trunc_len/8;`. So, if the truncated length (`ualg->alg_trunc_len`) isn't a multiple of 8, it's truncated during this division, which seems odd. This could lead to a vulnerability.

Now I need to understand how the XFRM state is communicated to user space. It could be a source of problems. Let's see how `copy_to_user_auth` works. I notice it copies `auth->alg_key` and other fields, and I see `nla_reserve` reserves space but doesn't initialize it, unlike `xfrm_alg_auth_len`, which does appear to compute the appropriate length. Also, `attach_auth_trunc` uses `kmemdup`, and I see the vulnerable code.

Ah, I think I'm seeing the bigger picture with the patch, the code is:

```c
	if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits ||
	    (ualg->alg_trunc_len & 7) ||
	    (ualg->alg_trunc_len > 0 && ualg->alg_trunc_len < 32)) {
		NL_SET_ERR_MSG(extack, "Invalid length requested for truncated ICV");
		return -EINVAL;
	}
```

The patch is fixing a potential bug, it appears. Specifically, it's validating the truncated ICV length. This is great, but now I'm thinking... Is there an uninitialized memory issue here, or is this an input validation check for a bug or panic? Now I need to search for relevant commits and mailing list discussions surrounding this to get the bigger story and understand the full implications.

{
  "Expression": "Invalid length requested for truncated ICV"
}

{
  "Output": "net/xfrm/xfrm_user.c=685=static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,\n--\nnet/xfrm/xfrm_user.c-703-\t    (ualg-\u003ealg_trunc_len \u003e 0 \u0026\u0026 ualg-\u003ealg_trunc_len \u003c 32)) {\nnet/xfrm/xfrm_user.c:704:\t\tNL_SET_ERR_MSG(extack, \"Invalid length requested for truncated ICV\");\nnet/xfrm/xfrm_user.c-705-\t\treturn -EINVAL;\n"
}

gemini-3.8-flash

null

null

							input: 22572
							output: 38
							thoughts: 236
						

**Debugging a Security Vulnerability**

Okay, let's dive into this. First, I need to jog my memory: what was the original syzkaller report or specific bug report that triggered this whole investigation? That's the starting point. Next, I need to understand the crux of the problem. Why is `ualg->alg_trunc_len & 7` or `< 32` a red flag? What specific function or call leads to it? My initial thoughts are that it may have been triggered by calls to `crypto_authenc_esn_setauthsize`, or `ah_input`, `ah_output`, or `esp_init_authenc`.

Hang on a moment... I'll check `crypto/authencesn.c`. Ah, here it is:

```c
static int crypto_authenc_esn_setauthsize(struct crypto_aead *authenc_esn,
					  unsigned int authsize)
{
	if (authsize > 0 && authsize < 4)
		return -EINVAL;
}
```

Okay, I see the potential issue now. What if `authsize` isn't a multiple of 4 or 8, or falls below the minimum size of 4? Now the implications of that are starting to crystallize...

Now the hunt continues. I'm going to look into `esp4.c` and `esp6.c` and see how this potential issue may have been triggered. Specifically, I should check `net/ipv4/esp4.c` around line 1098. That should reveal what is using `authsize`.

{
  "File": "net/ipv4/esp4.c",
  "FirstLine": 1085,
  "LineCount": 40
}

{
  "Contents": "1085:\t\t\tmemcpy(p, x-\u003eaalg-\u003ealg_key, (x-\u003eaalg-\u003ealg_key_len + 7) / 8);\n1086:\t\t\tp += (x-\u003eaalg-\u003ealg_key_len + 7) / 8;\n1087:\t\n1088:\t\t\taalg_desc = xfrm_aalg_get_byname(x-\u003eaalg-\u003ealg_name, 0);\n1089:\t\t\tBUG_ON(!aalg_desc);\n1090:\t\n1091:\t\t\terr = -EINVAL;\n1092:\t\t\tif (aalg_desc-\u003euinfo.auth.icv_fullbits / 8 !=\n1093:\t\t\t    crypto_aead_authsize(aead)) {\n1094:\t\t\t\tNL_SET_ERR_MSG(extack, \"Kernel was unable to initialize cryptographic operations\");\n1095:\t\t\t\tgoto free_key;\n1096:\t\t\t}\n1097:\t\n1098:\t\t\terr = crypto_aead_setauthsize(\n1099:\t\t\t\taead, x-\u003eaalg-\u003ealg_trunc_len / 8);\n1100:\t\t\tif (err) {\n1101:\t\t\t\tNL_SET_ERR_MSG(extack, \"Kernel was unable to initialize cryptographic operations\");\n1102:\t\t\t\tgoto free_key;\n1103:\t\t\t}\n1104:\t\t}\n1105:\t\n1106:\t\tparam-\u003eenckeylen = cpu_to_be32((x-\u003eealg-\u003ealg_key_len + 7) / 8);\n1107:\t\tmemcpy(p, x-\u003eealg-\u003ealg_key, (x-\u003eealg-\u003ealg_key_len + 7) / 8);\n1108:\t\n1109:\t\terr = crypto_aead_setkey(aead, key, keylen);\n1110:\t\n1111:\tfree_key:\n1112:\t\tkfree_sensitive(key);\n1113:\t\n1114:\terror:\n1115:\t\treturn err;\n1116:\t}\n1117:\t\n1118:\tstatic int esp_init_state(struct xfrm_state *x, struct netlink_ext_ack *extack)\n1119:\t{\n1120:\t\tstruct crypto_aead *aead;\n1121:\t\tu32 align;\n1122:\t\tint err;\n1123:\t\n1124:\t\tx-\u003edata = NULL;\n"
}

gemini-3.8-flash

null

null

							input: 23866
							output: 37
							thoughts: 43
						

Okay, let me think this through.

**Analyzing the Relevant Code**

Hold on a second, something's nagging at me. What about `ah4.c`? We haven't looked at that closely yet. Specifically, I need to get a better handle on what's happening within that file. I should focus in on lines 50 through 140, and the `ah_input` variable in particular. It's likely that something relevant to the issue I'm investigating is happening in that section. Time to dig in and see what's going on.

{
  "File": "net/ipv4/ah4.c",
  "FirstLine": 460,
  "LineCount": 70
}

{
  "Contents": " 460:\t\t\tbreak;\n 461:\t\tcase ICMP_REDIRECT:\n 462:\t\t\tbreak;\n 463:\t\tdefault:\n 464:\t\t\treturn 0;\n 465:\t\t}\n 466:\t\n 467:\t\tx = xfrm_state_lookup(net, skb-\u003emark, (const xfrm_address_t *)\u0026iph-\u003edaddr,\n 468:\t\t\t\t      ah-\u003espi, IPPROTO_AH, AF_INET);\n 469:\t\tif (!x)\n 470:\t\t\treturn 0;\n 471:\t\n 472:\t\tif (icmp_hdr(skb)-\u003etype == ICMP_DEST_UNREACH)\n 473:\t\t\tipv4_update_pmtu(skb, net, info, 0, IPPROTO_AH);\n 474:\t\telse\n 475:\t\t\tipv4_redirect(skb, net, 0, IPPROTO_AH);\n 476:\t\txfrm_state_put(x);\n 477:\t\n 478:\t\treturn 0;\n 479:\t}\n 480:\t\n 481:\tstatic int ah_init_state(struct xfrm_state *x, struct netlink_ext_ack *extack)\n 482:\t{\n 483:\t\tstruct ah_data *ahp = NULL;\n 484:\t\tstruct xfrm_algo_desc *aalg_desc;\n 485:\t\tstruct crypto_ahash *ahash;\n 486:\t\n 487:\t\tif (!x-\u003eaalg) {\n 488:\t\t\tNL_SET_ERR_MSG(extack, \"AH requires a state with an AUTH algorithm\");\n 489:\t\t\tgoto error;\n 490:\t\t}\n 491:\t\n 492:\t\tif (x-\u003eencap) {\n 493:\t\t\tNL_SET_ERR_MSG(extack, \"AH is not compatible with encapsulation\");\n 494:\t\t\tgoto error;\n 495:\t\t}\n 496:\t\n 497:\t\tahp = kzalloc_obj(*ahp);\n 498:\t\tif (!ahp)\n 499:\t\t\treturn -ENOMEM;\n 500:\t\n 501:\t\tahash = crypto_alloc_ahash(x-\u003eaalg-\u003ealg_name, 0, 0);\n 502:\t\tif (IS_ERR(ahash)) {\n 503:\t\t\tNL_SET_ERR_MSG(extack, \"Kernel was unable to initialize cryptographic operations\");\n 504:\t\t\tgoto error;\n 505:\t\t}\n 506:\t\n 507:\t\tahp-\u003eahash = ahash;\n 508:\t\tif (crypto_ahash_setkey(ahash, x-\u003eaalg-\u003ealg_key,\n 509:\t\t\t\t\t(x-\u003eaalg-\u003ealg_key_len + 7) / 8)) {\n 510:\t\t\tNL_SET_ERR_MSG(extack, \"Kernel was unable to initialize cryptographic operations\");\n 511:\t\t\tgoto error;\n 512:\t\t}\n 513:\t\n 514:\t\t/*\n 515:\t\t * Lookup the algorithm description maintained by xfrm_algo,\n 516:\t\t * verify crypto transform properties, and store information\n 517:\t\t * we need for AH processing.  This lookup cannot fail here\n 518:\t\t * after a successful crypto_alloc_ahash().\n 519:\t\t */\n 520:\t\taalg_desc = xfrm_aalg_get_byname(x-\u003eaalg-\u003ealg_name, 0);\n 521:\t\tBUG_ON(!aalg_desc);\n 522:\t\n 523:\t\tif (aalg_desc-\u003euinfo.auth.icv_fullbits/8 !=\n 524:\t\t    crypto_ahash_digestsize(ahash)) {\n 525:\t\t\tNL_SET_ERR_MSG(extack, \"Kernel was unable to initialize cryptographic operations\");\n 526:\t\t\tgoto error;\n 527:\t\t}\n 528:\t\n 529:\t\tahp-\u003eicv_full_len = aalg_desc-\u003euinfo.auth.icv_fullbits/8;\n"
}

gemini-3.8-flash

null

null

							input: 25167
							output: 37
							thoughts: 14
						

Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Analyzing the `ah_input` Function**

Okay, let's break this down. My focus right now is pinpointing what's happening within the `ah_input` function. It’s the entry point, or at least a significant one, and understanding its role is crucial. I want to trace the flow, identifying the data it receives, the transformations it performs, and, crucially, where it branches or hands off processing. I need to understand if it's primarily a validation step, a data preparation module, or a more involved processing stage. Is this a user-facing input handler, or something further down the stack? What kind of data structures does it interact with? Are there potential performance bottlenecks, or security vulnerabilities that would be relevant to this area? I need to analyze its direct dependencies, and start building a mental map of its relationship to the rest of the system. Let's dig in.

{
  "File": "net/ipv4/ah4.c",
  "FirstLine": 380,
  "LineCount": 80
}

{
  "Contents": " 380:\t\t}\n 381:\t\n 382:\t\tseqhi = (__be32 *)((char *)work_iph + ihl);\n 383:\t\tauth_data = ah_tmp_auth(seqhi, seqhi_len);\n 384:\t\ticv = ah_tmp_icv(auth_data, ahp-\u003eicv_trunc_len);\n 385:\t\treq = ah_tmp_req(ahash, icv);\n 386:\t\tsg = ah_req_sg(ahash, req);\n 387:\t\tseqhisg = sg + nfrags;\n 388:\t\n 389:\t\tmemcpy(work_iph, iph, ihl);\n 390:\t\tmemcpy(auth_data, ah-\u003eauth_data, ahp-\u003eicv_trunc_len);\n 391:\t\tmemset(ah-\u003eauth_data, 0, ahp-\u003eicv_trunc_len);\n 392:\t\n 393:\t\tiph-\u003ettl = 0;\n 394:\t\tiph-\u003etos = 0;\n 395:\t\tiph-\u003efrag_off = 0;\n 396:\t\tiph-\u003echeck = 0;\n 397:\t\tif (ihl \u003e sizeof(*iph)) {\n 398:\t\t\t__be32 dummy;\n 399:\t\t\terr = ip_clear_mutable_options(iph, \u0026dummy);\n 400:\t\t\tif (err)\n 401:\t\t\t\tgoto out_free;\n 402:\t\t}\n 403:\t\n 404:\t\tskb_push(skb, ihl);\n 405:\t\n 406:\t\tsg_init_table(sg, nfrags + sglists);\n 407:\t\terr = skb_to_sgvec_nomark(skb, sg, 0, skb-\u003elen);\n 408:\t\tif (unlikely(err \u003c 0))\n 409:\t\t\tgoto out_free;\n 410:\t\n 411:\t\tif (x-\u003eprops.flags \u0026 XFRM_STATE_ESN) {\n 412:\t\t\t/* Attach seqhi sg right after packet payload */\n 413:\t\t\t*seqhi = XFRM_SKB_CB(skb)-\u003eseq.input.hi;\n 414:\t\t\tsg_set_buf(seqhisg, seqhi, seqhi_len);\n 415:\t\t}\n 416:\t\tahash_request_set_crypt(req, sg, icv, skb-\u003elen + seqhi_len);\n 417:\t\tahash_request_set_callback(req, 0, ah_input_done, skb);\n 418:\t\n 419:\t\tAH_SKB_CB(skb)-\u003etmp = work_iph;\n 420:\t\n 421:\t\terr = crypto_ahash_digest(req);\n 422:\t\tif (err) {\n 423:\t\t\tif (err == -EINPROGRESS)\n 424:\t\t\t\tgoto out;\n 425:\t\n 426:\t\t\tgoto out_free;\n 427:\t\t}\n 428:\t\n 429:\t\terr = crypto_memneq(icv, auth_data, ahp-\u003eicv_trunc_len) ? -EBADMSG : 0;\n 430:\t\tif (err)\n 431:\t\t\tgoto out_free;\n 432:\t\n 433:\t\tskb-\u003enetwork_header += ah_hlen;\n 434:\t\tmemcpy(skb_network_header(skb), work_iph, ihl);\n 435:\t\t__skb_pull(skb, ah_hlen + ihl);\n 436:\t\tif (x-\u003eprops.mode == XFRM_MODE_TUNNEL)\n 437:\t\t\tskb_reset_transport_header(skb);\n 438:\t\telse\n 439:\t\t\tskb_set_transport_header(skb, -ihl);\n 440:\t\n 441:\t\terr = nexthdr;\n 442:\t\n 443:\tout_free:\n 444:\t\tkfree (work_iph);\n 445:\tout:\n 446:\t\treturn err;\n 447:\t}\n 448:\t\n 449:\tstatic int ah4_err(struct sk_buff *skb, u32 info)\n 450:\t{\n 451:\t\tstruct net *net = dev_net(skb-\u003edev);\n 452:\t\tconst struct iphdr *iph = (const struct iphdr *)skb-\u003edata;\n 453:\t\tstruct ip_auth_hdr *ah = (struct ip_auth_hdr *)(skb-\u003edata+(iph-\u003eihl\u003c\u003c2));\n 454:\t\tstruct xfrm_state *x;\n 455:\t\n 456:\t\tswitch (icmp_hdr(skb)-\u003etype) {\n 457:\t\tcase ICMP_DEST_UNREACH:\n 458:\t\t\tif (icmp_hdr(skb)-\u003ecode != ICMP_FRAG_NEEDED)\n 459:\t\t\t\treturn 0;\n"
}

gemini-3.8-flash

null

null

							input: 26746
							output: 31
							thoughts: 35
						

Okay, here's my interpretation of those thoughts, presented as if they're my own:

**Analyzing Variable Definitions for Context**

Alright, let's dive in. The code is referencing `ah_tmp_icv`. I need to understand what this variable represents, especially in relation to `ah_alloc_tmp`. My immediate thought is, I need to check the definitions of both. Where are they declared? What data types are they? How are they initialized? What scope do they have? The relationship between these two variables is key to understanding the current operation or potential issue. Understanding their specific definitions will quickly reveal their function within the overall algorithm. Let's start digging into the declaration and initialization of these two variables. That's my next step.

{
  "Expression": "ah_tmp_icv",
  "PathPrefix": "net/ipv4/"
}

{
  "Output": "net/ipv4/ah4.c=42=static inline u8 *ah_tmp_auth(void *tmp, unsigned int offset)\n--\nnet/ipv4/ah4.c-46-\nnet/ipv4/ah4.c:47:static inline u8 *ah_tmp_icv(void *tmp, unsigned int offset)\nnet/ipv4/ah4.c-48-{\n--\nnet/ipv4/ah4.c=117=static void ah_output_done(void *data, int err)\n--\nnet/ipv4/ah4.c-133-\tseqhi = (__be32 *)((char *)iph + ihl);\nnet/ipv4/ah4.c:134:\ticv = ah_tmp_icv(seqhi, seqhi_len);\nnet/ipv4/ah4.c-135-\tmemcpy(ah-\u003eauth_data, icv, ahp-\u003eicv_trunc_len);\n--\nnet/ipv4/ah4.c=149=static int ah_output(struct xfrm_state *x, struct sk_buff *skb)\n--\nnet/ipv4/ah4.c-186-\tseqhi = (__be32 *)((char *)iph + ihl);\nnet/ipv4/ah4.c:187:\ticv = ah_tmp_icv(seqhi, seqhi_len);\nnet/ipv4/ah4.c-188-\treq = ah_tmp_req(ahash, icv);\n--\nnet/ipv4/ah4.c=267=static void ah_input_done(void *data, int err)\n--\nnet/ipv4/ah4.c-288-\tauth_data = ah_tmp_auth(seqhi, seqhi_len);\nnet/ipv4/ah4.c:289:\ticv = ah_tmp_icv(auth_data, ahp-\u003eicv_trunc_len);\nnet/ipv4/ah4.c-290-\n--\nnet/ipv4/ah4.c=310=static int ah_input(struct xfrm_state *x, struct sk_buff *skb)\n--\nnet/ipv4/ah4.c-383-\tauth_data = ah_tmp_auth(seqhi, seqhi_len);\nnet/ipv4/ah4.c:384:\ticv = ah_tmp_icv(auth_data, ahp-\u003eicv_trunc_len);\nnet/ipv4/ah4.c-385-\treq = ah_tmp_req(ahash, icv);\n"
}

gemini-3.8-flash

null

null

							input: 27622
							output: 36
							thoughts: 20
						

Okay, let's break this down. Here's how I'd approach those two identifiers, from my expert perspective:

**Thinking Through Temporary Authentication and Integrity Checks**

Alright, I see these two variables: `ah_tmp_auth` and `ah_tmp_icv`. My immediate thought is, these are likely related to temporary mechanisms – specifically, authentication and integrity verification. The "ah" prefix is interesting; it could stand for anything, but given the context, I'm leaning towards "authentication handler" or perhaps even something specific to an application architecture I'm familiar with.

The "tmp" suffix clearly denotes these are temporary constructs. This tells me that this isn't a long-term storage or permanent setting. It's almost certainly involved in a specific request/response cycle, perhaps related to a user session or a particular transaction. It's likely these values are generated dynamically, used for a limited time, and then discarded. The purpose is to prevent replay attacks or tampering during a session.

So, `ah_tmp_auth` must represent a temporary authentication token or key. The precise implementation is the next question. Is it a hash? A digital signature? An ephemeral key exchange value? Knowing the system architecture would reveal its mechanism. I'd be looking for where this value is generated, how it's transmitted, and how it's validated. Is it salted? Does it employ a time-based expiration? All these are critical considerations.

Then there's `ah_tmp_icv`. This one screams "Integrity Check Value" or "Integrity Control Value" to me. It's highly likely this is used to verify the integrity of some data being transmitted. Think of it as a checksum, a cryptographic hash, or maybe even a Message Authentication Code (MAC). Its goal would be to confirm that the data hasn't been corrupted or altered during transit. The "ah" prefix implies its connection to the authentication handler as well.

I need to understand what data this ICV protects and how it is computed. Is it protecting a specific message, the whole request body, or a part of it? Is it relying on a shared secret or a public key? If I had the source code I would want to see how this value is generated, how it is attached, and how it is verified at the receiving end. Is it weak or strong? I'd want to assess any potential vulnerabilities, looking for ways an attacker could bypass this integrity check.

In conclusion, I'd immediately focus on how these temporaries work together. Do they secure data or authenticate parties? Are they separate but related, or does one depend on the other? Context is everything, but this initial analysis gives me a solid starting point for a deeper investigation.

{
  "File": "net/ipv4/ah4.c",
  "FirstLine": 35,
  "LineCount": 40
}

{
  "Contents": "  35:\t\tlen = ALIGN(len, __alignof__(struct scatterlist));\n  36:\t\n  37:\t\tlen += sizeof(struct scatterlist) * nfrags;\n  38:\t\n  39:\t\treturn kmalloc(len, GFP_ATOMIC);\n  40:\t}\n  41:\t\n  42:\tstatic inline u8 *ah_tmp_auth(void *tmp, unsigned int offset)\n  43:\t{\n  44:\t\treturn tmp + offset;\n  45:\t}\n  46:\t\n  47:\tstatic inline u8 *ah_tmp_icv(void *tmp, unsigned int offset)\n  48:\t{\n  49:\t\treturn tmp + offset;\n  50:\t}\n  51:\t\n  52:\tstatic inline struct ahash_request *ah_tmp_req(struct crypto_ahash *ahash,\n  53:\t\t\t\t\t\t       u8 *icv)\n  54:\t{\n  55:\t\tstruct ahash_request *req;\n  56:\t\n  57:\t\treq = (void *)PTR_ALIGN(icv + crypto_ahash_digestsize(ahash),\n  58:\t\t\t\t\tcrypto_tfm_ctx_alignment());\n  59:\t\n  60:\t\tahash_request_set_tfm(req, ahash);\n  61:\t\n  62:\t\treturn req;\n  63:\t}\n  64:\t\n  65:\tstatic inline struct scatterlist *ah_req_sg(struct crypto_ahash *ahash,\n  66:\t\t\t\t\t\t     struct ahash_request *req)\n  67:\t{\n  68:\t\treturn (void *)ALIGN((unsigned long)(req + 1) +\n  69:\t\t\t\t     crypto_ahash_reqsize(ahash),\n  70:\t\t\t\t     __alignof__(struct scatterlist));\n  71:\t}\n  72:\t\n  73:\t/* Clear mutable options and find final destination to substitute\n  74:\t * into IP header for icv calculation. Options are already checked\n"
}

gemini-3.8-flash

null

null

							input: 28782
							output: 36
							thoughts: 9
						

Okay, here's my summary, taking on the persona you've requested. Let me dive in:

**Diving into `ah_alloc_tmp`**

Alright, let's take a look at this `ah_alloc_tmp`. My initial assessment? It's likely a temporary memory allocation function, potentially within the context of a larger allocation framework. Given the "ah" prefix, it could be specific to a particular subsystem or application, perhaps something related to audio or a hardware abstraction layer (HAL) – those "ah" initials do suggest something like that.

I need to understand what this temporary allocation is being used for. Is it for buffering data? Is it for constructing intermediate data structures? Knowing the purpose is critical. I'll need to trace its usage within the codebase to identify the calls and understand the allocation patterns. Are we dealing with small, frequent allocations, or larger chunks of memory at sporadic intervals? Understanding the size and frequency will lead me to the right insights. I'll need to figure out the lifetime of the allocated memory as well: is it deallocated quickly, at the end of a function, or is it longer-lived, perhaps tied to a specific object or context?

I'm particularly interested in error handling. What happens if the allocation fails? Is there a graceful fallback mechanism? Or does it lead to a critical failure? Also, are there potential memory leaks if the deallocation isn't handled correctly under all circumstances? I'll want to scan for the deallocation counterpart and investigate that as well.

Finally, I'll keep an eye out for any potential race conditions or concurrency issues if this allocation is used in a multi-threaded or interrupt-driven environment. Synchronization mechanisms are important to be aware of and check the code for.

Basically, I will be looking to see if `ah_alloc_tmp` fits well within the larger memory management framework and is used efficiently and safely. That's the first step!

{
  "File": "net/ipv4/ah4.c",
  "FirstLine": 15,
  "LineCount": 30
}

{
  "Contents": "  15:\t#include \u003cnet/icmp.h\u003e\n  16:\t#include \u003cnet/protocol.h\u003e\n  17:\t\n  18:\tstruct ah_skb_cb {\n  19:\t\tstruct xfrm_skb_cb xfrm;\n  20:\t\tvoid *tmp;\n  21:\t};\n  22:\t\n  23:\t#define AH_SKB_CB(__skb) ((struct ah_skb_cb *)\u0026((__skb)-\u003ecb[0]))\n  24:\t\n  25:\tstatic void *ah_alloc_tmp(struct crypto_ahash *ahash, int nfrags,\n  26:\t\t\t\t  unsigned int size)\n  27:\t{\n  28:\t\tunsigned int len;\n  29:\t\n  30:\t\tlen = size + crypto_ahash_digestsize(ahash);\n  31:\t\n  32:\t\tlen = ALIGN(len, crypto_tfm_ctx_alignment());\n  33:\t\n  34:\t\tlen += sizeof(struct ahash_request) + crypto_ahash_reqsize(ahash);\n  35:\t\tlen = ALIGN(len, __alignof__(struct scatterlist));\n  36:\t\n  37:\t\tlen += sizeof(struct scatterlist) * nfrags;\n  38:\t\n  39:\t\treturn kmalloc(len, GFP_ATOMIC);\n  40:\t}\n  41:\t\n  42:\tstatic inline u8 *ah_tmp_auth(void *tmp, unsigned int offset)\n  43:\t{\n  44:\t\treturn tmp + offset;\n"
}

gemini-3.8-flash

null

null

							input: 29652
							output: 37
							thoughts: 441
						

**Analyzing AH Input Processing**

Okay, let's break down this AH input processing. I'm focusing on `ah_alloc_tmp` within `ah_input`. It looks like we're allocating temporary memory for the IPsec AH header, specifically based on lengths derived from various fields. The critical part is how `len` is calculated: `ihl + seqhi_len + ahp->icv_trunc_len`. This `icv_trunc_len` is what's catching my eye.

I'm starting to think about potential alignment issues. If `icv_trunc_len` isn't a multiple of 8 (or possibly less than 32), things could get messy. We're using `ah_alloc_tmp`, and the subsequent pointers `seqhi`, `auth_data`, `icv`, and `req` are all derived from this temporary buffer. Any miscalculation in allocation will lead to accessing out-of-bounds memory.

Then there's the `ip_auth_hdr` structure itself. I'm taking a close look at the `hdrlen` field. It's in 4-byte units, minus 2, which seems pretty standard, but is something I should keep in mind in context with any alignment problems.

I recall that somewhere the header length is aligned, possibly by 4 or 8 bytes, depending on some `XFRM_STATE_ALIGN4` flag. Now I'm checking `ah4.c`, specifically those lines calculating `x->props.header_len`.  We're either aligning to 4 or 8, depending on the `XFRM_STATE_ALIGN4` flag. This alignment, combined with the possibly non-aligned `icv_trunc_len`, could introduce alignment issues.  The fact that alignment might be configurable (4 or 8) is another point of concern that makes it critical to consider the specifics of how `icv_trunc_len` is computed. The `XFRM_ALIGN4` and `XFRM_ALIGN8` macros are something I'll need to check the definitions of.

I need to confirm all the interactions of how this header length is aligned within the IPsec AH processing. So, I must scrutinize lines 310-379 of `net/ipv4/ah4.c`. I have a feeling there's a potential vulnerability lurking in how these lengths and alignments are handled, potentially leading to buffer overflows or out-of-bounds reads if the truncation length isn't properly handled.

{
  "File": "net/ipv4/ah4.c",
  "FirstLine": 310,
  "LineCount": 70
}

{
  "Contents": " 310:\tstatic int ah_input(struct xfrm_state *x, struct sk_buff *skb)\n 311:\t{\n 312:\t\tint ah_hlen;\n 313:\t\tint ihl;\n 314:\t\tint nexthdr;\n 315:\t\tint nfrags;\n 316:\t\tu8 *auth_data;\n 317:\t\tu8 *icv;\n 318:\t\tstruct sk_buff *trailer;\n 319:\t\tstruct crypto_ahash *ahash;\n 320:\t\tstruct ahash_request *req;\n 321:\t\tstruct scatterlist *sg;\n 322:\t\tstruct iphdr *iph, *work_iph;\n 323:\t\tstruct ip_auth_hdr *ah;\n 324:\t\tstruct ah_data *ahp;\n 325:\t\tint err = -ENOMEM;\n 326:\t\tint seqhi_len = 0;\n 327:\t\t__be32 *seqhi;\n 328:\t\tint sglists = 0;\n 329:\t\tstruct scatterlist *seqhisg;\n 330:\t\n 331:\t\tif (!pskb_may_pull(skb, sizeof(*ah)))\n 332:\t\t\tgoto out;\n 333:\t\n 334:\t\tah = (struct ip_auth_hdr *)skb-\u003edata;\n 335:\t\tahp = x-\u003edata;\n 336:\t\tahash = ahp-\u003eahash;\n 337:\t\n 338:\t\tnexthdr = ah-\u003enexthdr;\n 339:\t\tah_hlen = (ah-\u003ehdrlen + 2) \u003c\u003c 2;\n 340:\t\n 341:\t\tif (x-\u003eprops.flags \u0026 XFRM_STATE_ALIGN4) {\n 342:\t\t\tif (ah_hlen != XFRM_ALIGN4(sizeof(*ah) + ahp-\u003eicv_full_len) \u0026\u0026\n 343:\t\t\t    ah_hlen != XFRM_ALIGN4(sizeof(*ah) + ahp-\u003eicv_trunc_len))\n 344:\t\t\t\tgoto out;\n 345:\t\t} else {\n 346:\t\t\tif (ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp-\u003eicv_full_len) \u0026\u0026\n 347:\t\t\t    ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp-\u003eicv_trunc_len))\n 348:\t\t\t\tgoto out;\n 349:\t\t}\n 350:\t\n 351:\t\tif (!pskb_may_pull(skb, ah_hlen))\n 352:\t\t\tgoto out;\n 353:\t\n 354:\t\t/* We are going to _remove_ AH header to keep sockets happy,\n 355:\t\t * so... Later this can change. */\n 356:\t\tif (skb_unclone(skb, GFP_ATOMIC))\n 357:\t\t\tgoto out;\n 358:\t\n 359:\t\tskb-\u003eip_summed = CHECKSUM_NONE;\n 360:\t\n 361:\t\n 362:\t\tif ((err = skb_cow_data(skb, 0, \u0026trailer)) \u003c 0)\n 363:\t\t\tgoto out;\n 364:\t\tnfrags = err;\n 365:\t\n 366:\t\tah = (struct ip_auth_hdr *)skb-\u003edata;\n 367:\t\tiph = ip_hdr(skb);\n 368:\t\tihl = ip_hdrlen(skb);\n 369:\t\n 370:\t\tif (x-\u003eprops.flags \u0026 XFRM_STATE_ESN) {\n 371:\t\t\tsglists = 1;\n 372:\t\t\tseqhi_len = sizeof(*seqhi);\n 373:\t\t}\n 374:\t\n 375:\t\twork_iph = ah_alloc_tmp(ahash, nfrags + sglists, ihl +\n 376:\t\t\t\t\tahp-\u003eicv_trunc_len + seqhi_len);\n 377:\t\tif (!work_iph) {\n 378:\t\t\terr = -ENOMEM;\n 379:\t\t\tgoto out;\n"
}

gemini-3.8-flash

null

null

							input: 31785
							output: 30
							thoughts: 788
						

**Analyzing Potential Integer Truncation Vulnerability**

Okay, here's what's running through my mind as I examine line 343: `ah_hlen != XFRM_ALIGN4(sizeof(*ah) + ahp->icv_trunc_len)`.  The key thing I'm focusing on is the potential for `ahp->icv_trunc_len` to be zero, or less than 4, and the impact this could have. My expertise tells me this is likely related to how the Authentication Header (AH) handles its ICV (Integrity Check Value) length.

First thought: *Wait*, what if the caller specified an ICV truncation length of 0?  I immediately remember a related function, `attach_auth_trunc`.  I need to check how it handles this 0 value.

Sure enough, here it is:
```c
	if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits ||
	    (ualg->alg_trunc_len & 7) ||
	    (ualg->alg_trunc_len > 0 && ualg->alg_trunc_len < 32)) {
		NL_SET_ERR_MSG(extack, "Invalid length requested for truncated ICV");
		return -EINVAL;
	}
...
	if (!p->alg_trunc_len)
		p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
```

*Aha!* If `ualg->alg_trunc_len` is 0, the check `!p->alg_trunc_len` kicks in, and it'll default to `algo->uinfo.auth.icv_truncbits`. This seems to handle the zero case correctly; a zero length gets converted to the default length.

But, what if `ualg->alg_trunc_len` is *between* 1 and 31? Let's say, 8 (one byte) or 16 (two bytes), or even, say, 7 bits - not a multiple of 8? That's what I really need to drill down on.  Why is the code rejecting these lengths with `(ualg->alg_trunc_len & 7) || (ualg->alg_trunc_len > 0 && ualg->alg_trunc_len < 32)`?

The answers quickly become obvious:

1.  ICV length must be byte-aligned: The `(ualg->alg_trunc_len & 7)` condition enforces that the length is a multiple of 8, because cryptographic ICVs need to operate on whole bytes. Providing a number of bits that isn't a multiple of 8 leads to mismatches and bit count errors.
2.  ICV length must be at least 32 bits (4 bytes) if non-zero: The second part `(ualg->alg_trunc_len > 0 && ualg->alg_trunc_len < 32)` checks for a non-zero, but less than 32, bit length. So, truncated lengths must be 4 bytes or more.

And *why* is the minimum truncation length 32 bits (4 bytes)?  I'm reaching for my reference material now:

I know I have seen this before. *Wait!* I need to check the relevant crypto code. I'm thinking of `crypto_authenc_esn_setauthsize`. And there it is:
```c
static int crypto_authenc_esn_setauthsize(struct crypto_aead *authenc_esn,
					  unsigned int authsize)
{
	if (authsize > 0 && authsize < 4)
		return -EINVAL;
```
It's there! A non-zero authsize can't be less than 4!

And just to be sure, I check the other crypto code that I suspect would have the same requirement:
```c
	if (authsize < 4 || authsize > 16 || authsize % 2)
		return -EINVAL;
```
The answer is clear now, and the IPsec RFCs back this up. Specifically, RFC 4302 (AH) Section 3.3.3.1.1.2. Authentication data must be an integral number of 32-bit (IPv4) or 64-bit (IPv6) words. Truncation must be 32 bits or more. This is an industry-standard requirement.

Now, what was the original report? It's time to check the git

{
  "Expression": "icv_truncbits",
  "PathPrefix": "net/xfrm/"
}

{
  "Output": "net/xfrm/xfrm_algo.c=27=static struct xfrm_algo_desc aead_list[] = {\n--\nnet/xfrm/xfrm_algo.c-33-\t\t\t.geniv = \"seqiv\",\nnet/xfrm/xfrm_algo.c:34:\t\t\t.icv_truncbits = 64,\nnet/xfrm/xfrm_algo.c-35-\t\t}\n--\nnet/xfrm/xfrm_algo.c-52-\t\t\t.geniv = \"seqiv\",\nnet/xfrm/xfrm_algo.c:53:\t\t\t.icv_truncbits = 96,\nnet/xfrm/xfrm_algo.c-54-\t\t}\n--\nnet/xfrm/xfrm_algo.c-71-\t\t\t.geniv = \"seqiv\",\nnet/xfrm/xfrm_algo.c:72:\t\t\t.icv_truncbits = 128,\nnet/xfrm/xfrm_algo.c-73-\t\t}\n--\nnet/xfrm/xfrm_algo.c-90-\t\t\t.geniv = \"seqiv\",\nnet/xfrm/xfrm_algo.c:91:\t\t\t.icv_truncbits = 64,\nnet/xfrm/xfrm_algo.c-92-\t\t}\n--\nnet/xfrm/xfrm_algo.c-109-\t\t\t.geniv = \"seqiv\",\nnet/xfrm/xfrm_algo.c:110:\t\t\t.icv_truncbits = 96,\nnet/xfrm/xfrm_algo.c-111-\t\t}\n--\nnet/xfrm/xfrm_algo.c-128-\t\t\t.geniv = \"seqiv\",\nnet/xfrm/xfrm_algo.c:129:\t\t\t.icv_truncbits = 128,\nnet/xfrm/xfrm_algo.c-130-\t\t}\n--\nnet/xfrm/xfrm_algo.c-147-\t\t\t.geniv = \"seqiv\",\nnet/xfrm/xfrm_algo.c:148:\t\t\t.icv_truncbits = 128,\nnet/xfrm/xfrm_algo.c-149-\t\t}\n--\nnet/xfrm/xfrm_algo.c-166-\t\t\t.geniv = \"seqiv\",\nnet/xfrm/xfrm_algo.c:167:\t\t\t.icv_truncbits = 128,\nnet/xfrm/xfrm_algo.c-168-\t\t}\n--\nnet/xfrm/xfrm_algo.c=175=static struct xfrm_algo_desc aalg_list[] = {\n--\nnet/xfrm/xfrm_algo.c-180-\t\t.auth = {\nnet/xfrm/xfrm_algo.c:181:\t\t\t.icv_truncbits = 0,\nnet/xfrm/xfrm_algo.c-182-\t\t\t.icv_fullbits = 0,\n--\nnet/xfrm/xfrm_algo.c-200-\t\t.auth = {\nnet/xfrm/xfrm_algo.c:201:\t\t\t.icv_truncbits = 96,\nnet/xfrm/xfrm_algo.c-202-\t\t\t.icv_fullbits = 128,\n--\nnet/xfrm/xfrm_algo.c-220-\t\t.auth = {\nnet/xfrm/xfrm_algo.c:221:\t\t\t.icv_truncbits = 96,\nnet/xfrm/xfrm_algo.c-222-\t\t\t.icv_fullbits = 160,\n--\nnet/xfrm/xfrm_algo.c-240-\t\t.auth = {\nnet/xfrm/xfrm_algo.c:241:\t\t\t.icv_truncbits = 96,\nnet/xfrm/xfrm_algo.c-242-\t\t\t.icv_fullbits = 256,\n--\nnet/xfrm/xfrm_algo.c-259-\t\t.auth = {\nnet/xfrm/xfrm_algo.c:260:\t\t\t.icv_truncbits = 192,\nnet/xfrm/xfrm_algo.c-261-\t\t\t.icv_fullbits = 384,\n--\nnet/xfrm/xfrm_algo.c-278-\t\t.auth = {\nnet/xfrm/xfrm_algo.c:279:\t\t\t.icv_truncbits = 256,\nnet/xfrm/xfrm_algo.c-280-\t\t\t.icv_fullbits = 512,\n--\nnet/xfrm/xfrm_algo.c-297-\t\t.auth = {\nnet/xfrm/xfrm_algo.c:298:\t\t\t.icv_truncbits = 96,\nnet/xfrm/xfrm_algo.c-299-\t\t\t.icv_fullbits = 128,\n--\nnet/xfrm/xfrm_algo.c-317-\t\t.auth = {\nnet/xfrm/xfrm_algo.c:318:\t\t\t.icv_truncbits = 96,\nnet/xfrm/xfrm_algo.c-319-\t\t\t.icv_fullbits = 128,\n--\nnet/xfrm/xfrm_algo.c-330-\t\t.auth = {\nnet/xfrm/xfrm_algo.c:331:\t\t\t.icv_truncbits = 256,\nnet/xfrm/xfrm_algo.c-332-\t\t\t.icv_fullbits = 256,\n--\nnet/xfrm/xfrm_algo.c=747=static int xfrm_aead_name_match(const struct xfrm_algo_desc *entry,\n--\nnet/xfrm/xfrm_algo.c-752-\nnet/xfrm/xfrm_algo.c:753:\treturn aead-\u003eicvbits == entry-\u003euinfo.aead.icv_truncbits \u0026\u0026 name \u0026\u0026\nnet/xfrm/xfrm_algo.c-754-\t       !strcmp(name, entry-\u003ename);\n--\nnet/xfrm/xfrm_user.c=653=static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,\n--\nnet/xfrm/xfrm_user.c-677-\tp-\u003ealg_key_len = ualg-\u003ealg_key_len;\nnet/xfrm/xfrm_user.c:678:\tp-\u003ealg_trunc_len = algo-\u003euinfo.auth.icv_truncbits;\nnet/xfrm/xfrm_user.c-679-\tmemcpy(p-\u003ealg_key, ualg-\u003ealg_key, (ualg-\u003ealg_key_len + 7) / 8);\n--\nnet/xfrm/xfrm_user.c=685=static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,\n--\nnet/xfrm/xfrm_user.c-714-\tif (!p-\u003ealg_trunc_len)\nnet/xfrm/xfrm_user.c:715:\t\tp-\u003ealg_trunc_len = algo-\u003euinfo.auth.icv_truncbits;\nnet/xfrm/xfrm_user.c-716-\n"
}

gemini-3.8-flash

null

null

							input: 35477
							output: 22
							thoughts: 552
						

**Investigating Potential Data Leaks and Corruption**

Okay, so I'm diving into this code and trying to understand potential vulnerabilities. My initial thought is to see what happens if `ualg->alg_trunc_len` is messed up. Specifically, what happens if it's invalid – say, less than 32 or not a multiple of 8? That seems like a prime area for things to go wrong.

Then, I'm thinking about the bigger picture, particularly `crypto_authenc`. I need to figure out how this `alg_trunc_len` plays out there. Okay, so I'm looking at `crypto/authenc.c`. I see `u8 *ihash = ahreq->result + authsize;` and then `scatterwalk_map_and_copy`. But what happens if `ualg->alg_trunc_len` isn't a multiple of 8? That's the core question.

Next, I'm checking `ah_output`. Ah, there's `memset(ah->auth_data, 0, ahp->icv_trunc_len);` and then `memcpy(ah->auth_data, icv, ahp->icv_trunc_len);`. This is where the truncation length is explicitly used. I need to trace where `ualg->alg_trunc_len` is even set or copied. I need to understand the data flow.

Alright, I'm checking `net/xfrm/xfrm_user.c`, specifically `copy_to_user_auth`. Here it is! I see a clear copy: `ap->alg_trunc_len = auth->alg_trunc_len;`. Okay, so `copy_to_user_auth` handles that.

Now, a red flag is starting to appear. Does `copy_to_user_auth` copy any uninitialized data? That's what I want to know now. It looks like it doesn't, but I still need to know `sizeof(*ap)`.

I need to understand what `struct xfrm_algo_auth` actually looks like.

{
  "Expression": "struct xfrm_algo_auth "
}

{
  "Output": "include/net/xfrm.h=2025=static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)\n--\ninclude/net/xfrm.h-2029-\ninclude/net/xfrm.h:2030:static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)\ninclude/net/xfrm.h-2031-{\n--\ninclude/net/xfrm.h=2093=static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)\n--\ninclude/net/xfrm.h-2097-\ninclude/net/xfrm.h:2098:static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)\ninclude/net/xfrm.h-2099-{\n--\ninclude/uapi/linux/xfrm.h=103=struct xfrm_algo {\n--\ninclude/uapi/linux/xfrm.h-108-\ninclude/uapi/linux/xfrm.h:109:struct xfrm_algo_auth {\ninclude/uapi/linux/xfrm.h-110-\tchar\t\talg_name[64];\n--\ninclude/uapi/linux/xfrm.h=293=enum xfrm_attr_type_t {\n--\ninclude/uapi/linux/xfrm.h-313-\tXFRMA_KMADDRESS,        /* struct xfrm_user_kmaddress */\ninclude/uapi/linux/xfrm.h:314:\tXFRMA_ALG_AUTH_TRUNC,\t/* struct xfrm_algo_auth */\ninclude/uapi/linux/xfrm.h-315-\tXFRMA_MARK,\t\t/* struct xfrm_mark */\n--\nnet/xfrm/xfrm_user.c=77=static int verify_auth_trunc(struct nlattr **attrs,\n--\nnet/xfrm/xfrm_user.c-80-\tstruct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];\nnet/xfrm/xfrm_user.c:81:\tstruct xfrm_algo_auth *algp;\nnet/xfrm/xfrm_user.c-82-\n--\nnet/xfrm/xfrm_user.c=625=static int attach_crypt(struct xfrm_state *x, struct nlattr *rta,\n--\nnet/xfrm/xfrm_user.c-652-\nnet/xfrm/xfrm_user.c:653:static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,\nnet/xfrm/xfrm_user.c-654-\t\t       struct nlattr *rta, struct netlink_ext_ack *extack)\n--\nnet/xfrm/xfrm_user.c-656-\tstruct xfrm_algo *ualg;\nnet/xfrm/xfrm_user.c:657:\tstruct xfrm_algo_auth *p;\nnet/xfrm/xfrm_user.c-658-\tstruct xfrm_algo_desc *algo;\n--\nnet/xfrm/xfrm_user.c-684-\nnet/xfrm/xfrm_user.c:685:static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,\nnet/xfrm/xfrm_user.c-686-\t\t\t     struct nlattr *rta, struct netlink_ext_ack *extack)\nnet/xfrm/xfrm_user.c-687-{\nnet/xfrm/xfrm_user.c:688:\tstruct xfrm_algo_auth *p, *ualg;\nnet/xfrm/xfrm_user.c-689-\tstruct xfrm_algo_desc *algo;\n--\nnet/xfrm/xfrm_user.c=1252=static bool xfrm_redact(void)\n--\nnet/xfrm/xfrm_user.c-1257-\nnet/xfrm/xfrm_user.c:1258:static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)\nnet/xfrm/xfrm_user.c-1259-{\nnet/xfrm/xfrm_user.c-1260-\tstruct xfrm_algo *algo;\nnet/xfrm/xfrm_user.c:1261:\tstruct xfrm_algo_auth *ap;\nnet/xfrm/xfrm_user.c-1262-\tstruct nlattr *nla;\n"
}

gemini-3.8-flash

null

null

							input: 37677
							output: 39
							thoughts: 30
						

Here's my take on the thought process, as if it were my own:

**Diving into the Authentication Algorithm Structure**

Okay, so I need to refresh my memory on the specifics of the `xfrm_algo_auth` structure. It's time to crack open the kernel headers. Specifically, I know the definition should be in `include/uapi/linux/xfrm.h`. I'll want to take a look at the data members. I'm especially interested in things like the keysize, the cryptographic hash function, and maybe details about the implementation. I'll need to remember how this structure plays into the larger XFRM framework. Let's see what the documentation and comments have to offer...it's been a while, but I know this is a core piece of the puzzle for authentication in IPsec.

{
  "File": "include/uapi/linux/xfrm.h",
  "FirstLine": 105,
  "LineCount": 20
}

{
  "Contents": " 105:\t\tunsigned int\talg_key_len;    /* in bits */\n 106:\t\tchar\t\talg_key[];\n 107:\t};\n 108:\t\n 109:\tstruct xfrm_algo_auth {\n 110:\t\tchar\t\talg_name[64];\n 111:\t\tunsigned int\talg_key_len;    /* in bits */\n 112:\t\tunsigned int\talg_trunc_len;  /* in bits */\n 113:\t\tchar\t\talg_key[];\n 114:\t};\n 115:\t\n 116:\tstruct xfrm_algo_aead {\n 117:\t\tchar\t\talg_name[64];\n 118:\t\tunsigned int\talg_key_len;\t/* in bits */\n 119:\t\tunsigned int\talg_icv_len;\t/* in bits */\n 120:\t\tchar\t\talg_key[];\n 121:\t};\n 122:\t\n 123:\tstruct xfrm_stats {\n 124:\t\t__u32\treplay_window;\n"
}

gemini-3.8-flash

null

null

							input: 38219
							output: 38
							thoughts: 98
						

**Analyzing the `xfrm_algo_auth` Structure and `verify_auth_trunc` Function**

Okay, let's break this down. First, I'm looking at the `struct xfrm_algo_auth`. The `alg_name` field is a character array, 64 bytes, and the `alg_key_len` and `alg_trunc_len` are unsigned integers, each 4 bytes. That comes to a total of 72 bytes. Hmm, no padding, which is good. Then there's `alg_key`, which I see is a flexible array member. I'll need to keep that in mind when calculating offsets and sizes, especially if I'm dealing with different key lengths.

Now, I need to shift my focus to `verify_auth_trunc`. I'll need to remember this structure and how `alg_key` functions.

{
  "File": "net/xfrm/xfrm_user.c",
  "FirstLine": 75,
  "LineCount": 40
}

{
  "Contents": "  75:\t}\n  76:\t\n  77:\tstatic int verify_auth_trunc(struct nlattr **attrs,\n  78:\t\t\t\t     struct netlink_ext_ack *extack)\n  79:\t{\n  80:\t\tstruct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];\n  81:\t\tstruct xfrm_algo_auth *algp;\n  82:\t\n  83:\t\tif (!rt)\n  84:\t\t\treturn 0;\n  85:\t\n  86:\t\talgp = nla_data(rt);\n  87:\t\tif (nla_len(rt) \u003c (int)xfrm_alg_auth_len(algp)) {\n  88:\t\t\tNL_SET_ERR_MSG(extack, \"Invalid AUTH_TRUNC attribute length\");\n  89:\t\t\treturn -EINVAL;\n  90:\t\t}\n  91:\t\n  92:\t\talgp-\u003ealg_name[sizeof(algp-\u003ealg_name) - 1] = '\\0';\n  93:\t\treturn 0;\n  94:\t}\n  95:\t\n  96:\tstatic int verify_aead(struct nlattr **attrs, struct netlink_ext_ack *extack)\n  97:\t{\n  98:\t\tstruct nlattr *rt = attrs[XFRMA_ALG_AEAD];\n  99:\t\tstruct xfrm_algo_aead *algp;\n 100:\t\n 101:\t\tif (!rt)\n 102:\t\t\treturn 0;\n 103:\t\n 104:\t\talgp = nla_data(rt);\n 105:\t\tif (nla_len(rt) \u003c (int)aead_len(algp)) {\n 106:\t\t\tNL_SET_ERR_MSG(extack, \"Invalid AEAD attribute length\");\n 107:\t\t\treturn -EINVAL;\n 108:\t\t}\n 109:\t\n 110:\t\talgp-\u003ealg_name[sizeof(algp-\u003ealg_name) - 1] = '\\0';\n 111:\t\treturn 0;\n 112:\t}\n 113:\t\n 114:\tstatic void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,\n"
}

gemini-3.8-flash

null

null

							input: 39143
							output: 278
							thoughts: 2176
						

**KMSAN Reasoning for `attach_auth_trunc` Patch**

Okay, so I've been looking at this patch for `attach_auth_trunc`, and the goal seems to be to tighten up the validation on the `alg_trunc_len` parameter. Specifically, it's adding a check to ensure the truncation length provided by userspace in a netlink message is byte-aligned (a multiple of 8 bits) and that if it's not zero, it's at least 32 bits.

My thought process is this: First, I needed to understand *what* the patch does. It's restricting the permitted values for this length field. Then, the critical question is whether this introduces any uninitialized memory risks. I ran through the criteria for needing KMSAN, and nothing seems to fit.

It's essentially *rejecting* invalid input. The `ualg->alg_trunc_len` value comes directly from the user-provided netlink message, so it's not uninitialized kernel memory. The patch doesn't involve any allocation, copying data to userspace that might have uninitialized padding, or changing the way existing memory is accessed in a way that *exposes* uninitialized bytes. If the value *was* invalid before the patch, and resulted in a crash, KASAN would catch it. If it was a crypto error, that would have been caught. This patch doesn't *create* a scenario where KMSAN would be the only tool to find a bug.

So, this boils down to adding checks to reject invalid input from userspace. It is defensively validating the input. This definitely tightens the security, rather than introducing potential risks. Therefore, `NeedsKMSAN` should be `false`. The patch doesn't introduce, modify, or expose any uninitialized memory risks, and any potential issues with invalid lengths would be detected by KASAN or standard detectors.

{
  "KMSANReasoning": "The patch adds input validation in `attach_auth_trunc()` within `net/xfrm/xfrm_user.c`, rejecting truncated ICV lengths (`ualg-\u003ealg_trunc_len`) that are not byte-aligned (`\u0026 7 != 0`) or are between 1 and 31 bits (`\u003e 0 \u0026\u0026 \u003c 32`).\n\nThis change does not introduce or expose any uninitialized memory risks:\n1. It does not introduce new allocations, data structures, or struct padding.\n2. It does not expose kernel memory to user space via info-leaks; it merely validates incoming Netlink attributes.\n3. The conditional logic operates on `ualg-\u003ealg_trunc_len`, which comes from the received Netlink attribute data in the skb, not uninitialized kernel memory.\n4. It tightens input validation rather than loosening bounds, preventing invalid lengths from reaching crypto drivers and IPsec processing. Any memory safety issues that could have resulted from misaligned or small ICV lengths (e.g., out-of-bounds reads/writes in crypto or packet processing) are detectable by KASAN.\n\nTherefore, a dedicated KMSAN fuzzing session is not warranted.",
  "NeedsKMSAN": false
}

{
  "KMSANReasoning": "The patch adds input validation in `attach_auth_trunc()` within `net/xfrm/xfrm_user.c`, rejecting truncated ICV lengths (`ualg-\u003ealg_trunc_len`) that are not byte-aligned (`\u0026 7 != 0`) or are between 1 and 31 bits (`\u003e 0 \u0026\u0026 \u003c 32`).\n\nThis change does not introduce or expose any uninitialized memory risks:\n1. It does not introduce new allocations, data structures, or struct padding.\n2. It does not expose kernel memory to user space via info-leaks; it merely validates incoming Netlink attributes.\n3. The conditional logic operates on `ualg-\u003ealg_trunc_len`, which comes from the received Netlink attribute data in the skb, not uninitialized kernel memory.\n4. It tightens input validation rather than loosening bounds, preventing invalid lengths from reaching crypto drivers and IPsec processing. Any memory safety issues that could have resulted from misaligned or small ICV lengths (e.g., out-of-bounds reads/writes in crypto or packet processing) are detectable by KASAN.\n\nTherefore, a dedicated KMSAN fuzzing session is not warranted.",
  "NeedsKMSAN": false
}