AI Trajectory

null

{
  "EnableConfigs": [
    "BPF_SYSCALL",
    "NET",
    "INET",
    "DEBUG_INFO_BTF"
  ],
  "FocusSymbols": [
    "bpf_sock_destroy",
    "tcp_abort"
  ],
  "KMSANReasoning": "The patch modifies the BPF kfunc `bpf_sock_destroy()` in `net/core/filter.c` to support non-full sockets (such as TCP TIME_WAIT sockets) by checking `sk_fullsock(sk)` before inspecting `sk-\u003esk_protocol`, and invokes `sk-\u003esk_prot-\u003ediag_destroy(sk, ECONNABORTED)`. The accompanying changes are BPF selftests.\n\nKMSAN vs KASAN applicability:\n- KMSAN detects reads of uninitialized memory and kernel-to-user info leaks. This patch introduces no uninitialized memory allocations, no structure copying to userspace (via copy_to_user, netlink, ioctl, etc.), and no branching on uninitialized data.\n- The potential risks associated with socket destruction (e.g., socket lifecycle/refcounting races, locking issues, use-after-free or out-of-bounds dereferences) are covered by KASAN, LOCKDEP, and standard memory corruption detectors.\n- Therefore, a dedicated KMSAN fuzzing session is not warranted.",
  "NeedsKMSAN": false,
  "Reasoning": "The patch modifies the reachable BPF kfunc `bpf_sock_destroy` to support non-full sockets (such as TCP TIME_WAIT and request sockets) by only checking the protocol on full sockets (`sk_fullsock`). This allows BPF iterator programs to invoke socket destruction (`diag_destroy` / `tcp_abort`) on timewait sockets and syn-recv requests, which can uncover race conditions or state-handling issues during socket teardown.",
  "WorthFuzzing": true
}

null

{
  "PatchDiff": "commit 7ee487435d161e68e7d9fda717f3544400bced8b\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Sat Sep 5 18:41:23 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/net/core/filter.c b/net/core/filter.c\nindex 61940e7535523..a41cc60a401a5 100644\n--- a/net/core/filter.c\n+++ b/net/core/filter.c\n@@ -12912,8 +12912,9 @@ __bpf_kfunc_start_defs();\n  * @sock: Pointer to socket to be destroyed\n  *\n  * Return:\n- * On error, may return EPROTONOSUPPORT, EINVAL.\n- * EPROTONOSUPPORT if protocol specific destroy handler is not supported.\n+ * On error, may return EOPNOTSUPP, or whatever the protocol specific\n+ * destroy handler returns.\n+ * EOPNOTSUPP if protocol specific destroy handler is not supported.\n  * 0 otherwise\n  */\n __bpf_kfunc int bpf_sock_destroy(struct sock_common *sock)\n@@ -12925,8 +12926,12 @@ __bpf_kfunc int bpf_sock_destroy(struct sock_common *sock)\n \t * Supporting protocols will need to acquire sock lock in the BPF context\n \t * prior to invoking this kfunc.\n \t */\n-\tif (!sk-\u003esk_prot-\u003ediag_destroy || (sk-\u003esk_protocol != IPPROTO_TCP \u0026\u0026\n-\t\t\t\t\t   sk-\u003esk_protocol != IPPROTO_UDP))\n+\tif (!sk-\u003esk_prot-\u003ediag_destroy)\n+\t\treturn -EOPNOTSUPP;\n+\n+\tif (sk_fullsock(sk) \u0026\u0026\n+\t    sk-\u003esk_protocol != IPPROTO_TCP \u0026\u0026\n+\t    sk-\u003esk_protocol != IPPROTO_UDP)\n \t\treturn -EOPNOTSUPP;\n \n \treturn sk-\u003esk_prot-\u003ediag_destroy(sk, ECONNABORTED);\ndiff --git a/tools/testing/selftests/bpf/prog_tests/sock_destroy.c b/tools/testing/selftests/bpf/prog_tests/sock_destroy.c\nindex 9c11938fe597d..b90fab7073386 100644\n--- a/tools/testing/selftests/bpf/prog_tests/sock_destroy.c\n+++ b/tools/testing/selftests/bpf/prog_tests/sock_destroy.c\n@@ -110,6 +110,74 @@ static void test_tcp_server(struct sock_destroy_prog *skel)\n \t\tclose(serv);\n }\n \n+static void test_tcp_timewait(struct sock_destroy_prog *skel)\n+{\n+\tint serv = -1, clien = -1, accept_serv = -1, n;\n+\tstruct timeval tv = {};\n+\tchar buf[1];\n+\n+\tserv = start_server(AF_INET6, SOCK_STREAM, NULL, 0, 0);\n+\tif (!ASSERT_GE(serv, 0, \"start_server\"))\n+\t\tgoto cleanup;\n+\n+\tclien = connect_to_fd(serv, 0);\n+\tif (!ASSERT_GE(clien, 0, \"connect_to_fd\"))\n+\t\tgoto cleanup;\n+\n+\taccept_serv = accept(serv, NULL, NULL);\n+\tif (!ASSERT_GE(accept_serv, 0, \"serv accept\"))\n+\t\tgoto cleanup;\n+\n+\t/*\n+\t * Active close from the client, then close the server side. Once\n+\t * recv() sees EOF the server FIN has been processed and the client\n+\t * sock is in TIME_WAIT. Block without timeout so a loaded CI box\n+\t * can't race us.\n+\t */\n+\tif (!ASSERT_OK(setsockopt(clien, SOL_SOCKET, SO_RCVTIMEO, \u0026tv,\n+\t\t\t\t  sizeof(tv)), \"clear rcvtimeo\"))\n+\t\tgoto cleanup;\n+\tif (!ASSERT_OK(shutdown(clien, SHUT_WR), \"client shutdown\"))\n+\t\tgoto cleanup;\n+\n+\t/*\n+\t * Make sure the server has seen the client FIN before it closes,\n+\t * so the two FINs never cross.\n+\t */\n+\tn = recv(accept_serv, buf, sizeof(buf), 0);\n+\tif (!ASSERT_EQ(n, 0, \"server recv EOF\"))\n+\t\tgoto cleanup;\n+\n+\tclose(accept_serv);\n+\taccept_serv = -1;\n+\n+\t/* block until return EOF */\n+\tn = recv(clien, buf, sizeof(buf), 0);\n+\tif (!ASSERT_EQ(n, 0, \"client recv EOF\"))\n+\t\tgoto cleanup;\n+\n+\t/* Run iterator program that destroys the timewait client sock. */\n+\tskel-\u003ebss-\u003etw_found = 0;\n+\tstart_iter_sockets(skel-\u003eprogs.iter_tcp6_timewait);\n+\tif (!ASSERT_EQ(skel-\u003ebss-\u003etw_found, 1, \"timewait sock found\"))\n+\t\tgoto cleanup;\n+\n+\tASSERT_OK(skel-\u003ebss-\u003etw_destroy_err, \"destroy timewait sock\");\n+\n+\t/* The destroyed timewait sock must be gone. */\n+\tskel-\u003ebss-\u003etw_found = 0;\n+\tstart_iter_sockets(skel-\u003eprogs.iter_tcp6_timewait);\n+\tASSERT_EQ(skel-\u003ebss-\u003etw_found, 0, \"timewait sock destroyed\");\n+\n+cleanup:\n+\tif (clien != -1)\n+\t\tclose(clien);\n+\tif (accept_serv != -1)\n+\t\tclose(accept_serv);\n+\tif (serv != -1)\n+\t\tclose(serv);\n+}\n+\n static void test_udp_client(struct sock_destroy_prog *skel)\n {\n \tint serv = -1, clien = -1, n = 0;\n@@ -204,11 +272,12 @@ void test_sock_destroy(void)\n \t\ttest_tcp_client(skel);\n \tif (test__start_subtest(\"tcp_server\"))\n \t\ttest_tcp_server(skel);\n+\tif (test__start_subtest(\"tcp_timewait\"))\n+\t\ttest_tcp_timewait(skel);\n \tif (test__start_subtest(\"udp_client\"))\n \t\ttest_udp_client(skel);\n \tif (test__start_subtest(\"udp_server\"))\n \t\ttest_udp_server(skel);\n-\n \tRUN_TESTS(sock_destroy_prog_fail);\n \n cleanup:\ndiff --git a/tools/testing/selftests/bpf/progs/sock_destroy_prog.c b/tools/testing/selftests/bpf/progs/sock_destroy_prog.c\nindex 9e0bf7a54cec9..0a8887543218a 100644\n--- a/tools/testing/selftests/bpf/progs/sock_destroy_prog.c\n+++ b/tools/testing/selftests/bpf/progs/sock_destroy_prog.c\n@@ -7,6 +7,8 @@\n #include \"bpf_tracing_net.h\"\n \n __be16 serv_port = 0;\n+int tw_found = 0;\n+int tw_destroy_err = 0;\n \n int bpf_sock_destroy(struct sock_common *sk) __ksym;\n \n@@ -100,6 +102,34 @@ int iter_tcp6_server(struct bpf_iter__tcp *ctx)\n \treturn 0;\n }\n \n+SEC(\"iter/tcp\")\n+int iter_tcp6_timewait(struct bpf_iter__tcp *ctx)\n+{\n+\tstruct sock_common *sk_common = ctx-\u003esk_common;\n+\t__u64 *val;\n+\tint key = 0;\n+\n+\tif (!sk_common)\n+\t\treturn 0;\n+\n+\tif (sk_common-\u003eskc_family != AF_INET6)\n+\t\treturn 0;\n+\n+\tif (!bpf_skc_to_tcp_timewait_sock(sk_common))\n+\t\treturn 0;\n+\n+\tval = bpf_map_lookup_elem(\u0026tcp_conn_sockets, \u0026key);\n+\tif (!val)\n+\t\treturn 0;\n+\t/* The timewait sock inherits the cookie of the closed client sock. */\n+\tif (bpf_get_socket_cookie(sk_common) != *val)\n+\t\treturn 0;\n+\n+\ttw_found++;\n+\ttw_destroy_err = bpf_sock_destroy(sk_common);\n+\n+\treturn 0;\n+}\n \n SEC(\"iter/udp\")\n int iter_udp6_client(struct bpf_iter__udp *ctx)\n"
}

core

null

{
  "EnableConfigs": [
    "BPF_SYSCALL",
    "NET",
    "INET",
    "DEBUG_INFO_BTF"
  ],
  "FocusSymbols": [
    "bpf_sock_destroy",
    "tcp_abort"
  ],
  "Reasoning": "The patch modifies the reachable BPF kfunc `bpf_sock_destroy` to support non-full sockets (such as TCP TIME_WAIT and request sockets) by only checking the protocol on full sockets (`sk_fullsock`). This allows BPF iterator programs to invoke socket destruction (`diag_destroy` / `tcp_abort`) on timewait sockets and syn-recv requests, which can uncover race conditions or state-handling issues during socket teardown.",
  "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 7ee487435d161e68e7d9fda717f3544400bced8b
Author: syz-cluster <triage@syzkaller.com>
Date:   Sat Sep 5 18:41:23 2026 +0000

    syz-cluster: applied patch under review

diff --git a/net/core/filter.c b/net/core/filter.c
index 61940e7535523..a41cc60a401a5 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -12912,8 +12912,9 @@ __bpf_kfunc_start_defs();
  * @sock: Pointer to socket to be destroyed
  *
  * Return:
- * On error, may return EPROTONOSUPPORT, EINVAL.
- * EPROTONOSUPPORT if protocol specific destroy handler is not supported.
+ * On error, may return EOPNOTSUPP, or whatever the protocol specific
+ * destroy handler returns.
+ * EOPNOTSUPP if protocol specific destroy handler is not supported.
  * 0 otherwise
  */
 __bpf_kfunc int bpf_sock_destroy(struct sock_common *sock)
@@ -12925,8 +12926,12 @@ __bpf_kfunc int bpf_sock_destroy(struct sock_common *sock)
 	 * Supporting protocols will need to acquire sock lock in the BPF context
 	 * prior to invoking this kfunc.
 	 */
-	if (!sk->sk_prot->diag_destroy || (sk->sk_protocol != IPPROTO_TCP &&
-					   sk->sk_protocol != IPPROTO_UDP))
+	if (!sk->sk_prot->diag_destroy)
+		return -EOPNOTSUPP;
+
+	if (sk_fullsock(sk) &&
+	    sk->sk_protocol != IPPROTO_TCP &&
+	    sk->sk_protocol != IPPROTO_UDP)
 		return -EOPNOTSUPP;
 
 	return sk->sk_prot->diag_destroy(sk, ECONNABORTED);
diff --git a/tools/testing/selftests/bpf/prog_tests/sock_destroy.c b/tools/testing/selftests/bpf/prog_tests/sock_destroy.c
index 9c11938fe597d..b90fab7073386 100644
--- a/tools/testing/selftests/bpf/prog_tests/sock_destroy.c
+++ b/tools/testing/selftests/bpf/prog_tests/sock_destroy.c
@@ -110,6 +110,74 @@ static void test_tcp_server(struct sock_destroy_prog *skel)
 		close(serv);
 }
 
+static void test_tcp_timewait(struct sock_destroy_prog *skel)
+{
+	int serv = -1, clien = -1, accept_serv = -1, n;
+	struct timeval tv = {};
+	char buf[1];
+
+	serv = start_server(AF_INET6, SOCK_STREAM, NULL, 0, 0);
+	if (!ASSERT_GE(serv, 0, "start_server"))
+		goto cleanup;
+
+	clien = connect_to_fd(serv, 0);
+	if (!ASSERT_GE(clien, 0, "connect_to_fd"))
+		goto cleanup;
+
+	accept_serv = accept(serv, NULL, NULL);
+	if (!ASSERT_GE(accept_serv, 0, "serv accept"))
+		goto cleanup;
+
+	/*
+	 * Active close from the client, then close the server side. Once
+	 * recv() sees EOF the server FIN has been processed and the client
+	 * sock is in TIME_WAIT. Block without timeout so a loaded CI box
+	 * can't race us.
+	 */
+	if (!ASSERT_OK(setsockopt(clien, SOL_SOCKET, SO_RCVTIMEO, &tv,
+				  sizeof(tv)), "clear rcvtimeo"))
+		goto cleanup;
+	if (!ASSERT_OK(shutdown(clien, SHUT_WR), "client shutdown"))
+		goto cleanup;
+
+	/*
+	 * Make sure the server has seen the client FIN before it closes,
+	 * so the two FINs never cross.
+	 */
+	n = recv(accept_serv, buf, sizeof(buf), 0);
+	if (!ASSERT_EQ(n, 0, "server recv EOF"))
+		goto cleanup;
+
+	close(accept_serv);
+	accept_serv = -1;
+
+	/* block until return EOF */
+	n = recv(clien, buf, sizeof(buf), 0);
+	if (!ASSERT_EQ(n, 0, "client recv EOF"))
+		goto cleanup;
+
+	/* Run iterator program that destroys the timewait client sock. */
+	skel->bss->tw_found = 0;
+	start_iter_sockets(skel->progs.iter_tcp6_timewait);
+	if (!ASSERT_EQ(skel->bss->tw_found, 1, "timewait sock found"))
+		goto cleanup;
+
+	ASSERT_OK(skel->bss->tw_destroy_err, "destroy timewait sock");
+
+	/* The destroyed timewait sock must be gone. */
+	skel->bss->tw_found = 0;
+	start_iter_sockets(skel->progs.iter_tcp6_timewait);
+	ASSERT_EQ(skel->bss->tw_found, 0, "timewait sock destroyed");
+
+cleanup:
+	if (clien != -1)
+		close(clien);
+	if (accept_serv != -1)
+		close(accept_serv);
+	if (serv != -1)
+		close(serv);
+}
+
 static void test_udp_client(struct sock_destroy_prog *skel)
 {
 	int serv = -1, clien = -1, n = 0;
@@ -204,11 +272,12 @@ void test_sock_destroy(void)
 		test_tcp_client(skel);
 	if (test__start_subtest("tcp_server"))
 		test_tcp_server(skel);
+	if (test__start_subtest("tcp_timewait"))
+		test_tcp_timewait(skel);
 	if (test__start_subtest("udp_client"))
 		test_udp_client(skel);
 	if (test__start_subtest("udp_server"))
 		test_udp_server(skel);
-
 	RUN_TESTS(sock_destroy_prog_fail);
 
 cleanup:
diff --git a/tools/testing/selftests/bpf/progs/sock_destroy_prog.c b/tools/testing/selftests/bpf/progs/sock_destroy_prog.c
index 9e0bf7a54cec9..0a8887543218a 100644
--- a/tools/testing/selftests/bpf/progs/sock_destroy_prog.c
+++ b/tools/testing/selftests/bpf/progs/sock_destroy_prog.c
@@ -7,6 +7,8 @@
 #include "bpf_tracing_net.h"
 
 __be16 serv_port = 0;
+int tw_found = 0;
+int tw_destroy_err = 0;
 
 int bpf_sock_destroy(struct sock_common *sk) __ksym;
 
@@ -100,6 +102,34 @@ int iter_tcp6_server(struct bpf_iter__tcp *ctx)
 	return 0;
 }
 
+SEC("iter/tcp")
+int iter_tcp6_timewait(struct bpf_iter__tcp *ctx)
+{
+	struct sock_common *sk_common = ctx->sk_common;
+	__u64 *val;
+	int key = 0;
+
+	if (!sk_common)
+		return 0;
+
+	if (sk_common->skc_family != AF_INET6)
+		return 0;
+
+	if (!bpf_skc_to_tcp_timewait_sock(sk_common))
+		return 0;
+
+	val = bpf_map_lookup_elem(&tcp_conn_sockets, &key);
+	if (!val)
+		return 0;
+	/* The timewait sock inherits the cookie of the closed client sock. */
+	if (bpf_get_socket_cookie(sk_common) != *val)
+		return 0;
+
+	tw_found++;
+	tw_destroy_err = bpf_sock_destroy(sk_common);
+
+	return 0;
+}
 
 SEC("iter/udp")
 int iter_udp6_client(struct bpf_iter__udp *ctx)

gemini-3.7-flash

null

null

							input: 4867
							output: 37
							thoughts: 297
						

**Analyzing the bpf_sock_destroy Change**

Okay, let's dive into this `bpf_sock_destroy` diff. I need to understand exactly what's changed and the implications. Right away, I see the modifications within `net/core/filter.c`. It looks like we've got some conditional logic related to protocol handling and socket destruction.

Specifically, the code originally had a check to see if the socket protocol was neither TCP nor UDP before returning `-EOPNOTSUPP`. That check has been modified. Now, it appears there's a specific check `sk_fullsock(sk)` introduced, and the protocol filtering is within that new conditional. Also, a `-EOPNOTSUPP` is returned if `diag_destroy` is not defined.

I need to understand the reasoning here. The comment suggests that supporting protocols must acquire the sock lock before calling this kfunc. So I have to understand why the added check and the protocol filtering is relevant to this locking requirement.

To truly grasp this, I need context. I'll need to go beyond this snippet. I'm going to pull up `net/core/filter.c` to see how `bpf_sock_destroy` is defined. I'll also check where it's called and the related configuration dependencies. A quick `read-file` or `grepper` will give me that surrounding code, dependencies, and call sites. I need to see what other code this touches.

{
  "File": "net/core/filter.c",
  "FirstLine": 12910,
  "LineCount": 40
}

{
  "Contents": "12910:\t *\n12911:\t * Parameters:\n12912:\t * @sock: Pointer to socket to be destroyed\n12913:\t *\n12914:\t * Return:\n12915:\t * On error, may return EOPNOTSUPP, or whatever the protocol specific\n12916:\t * destroy handler returns.\n12917:\t * EOPNOTSUPP if protocol specific destroy handler is not supported.\n12918:\t * 0 otherwise\n12919:\t */\n12920:\t__bpf_kfunc int bpf_sock_destroy(struct sock_common *sock)\n12921:\t{\n12922:\t\tstruct sock *sk = (struct sock *)sock;\n12923:\t\n12924:\t\t/* The locking semantics that allow for synchronous execution of the\n12925:\t\t * destroy handlers are only supported for TCP and UDP.\n12926:\t\t * Supporting protocols will need to acquire sock lock in the BPF context\n12927:\t\t * prior to invoking this kfunc.\n12928:\t\t */\n12929:\t\tif (!sk-\u003esk_prot-\u003ediag_destroy)\n12930:\t\t\treturn -EOPNOTSUPP;\n12931:\t\n12932:\t\tif (sk_fullsock(sk) \u0026\u0026\n12933:\t\t    sk-\u003esk_protocol != IPPROTO_TCP \u0026\u0026\n12934:\t\t    sk-\u003esk_protocol != IPPROTO_UDP)\n12935:\t\t\treturn -EOPNOTSUPP;\n12936:\t\n12937:\t\treturn sk-\u003esk_prot-\u003ediag_destroy(sk, ECONNABORTED);\n12938:\t}\n12939:\t\n12940:\t__bpf_kfunc_end_defs();\n12941:\t\n12942:\tBTF_KFUNCS_START(bpf_sk_iter_kfunc_ids)\n12943:\tBTF_ID_FLAGS(func, bpf_sock_destroy)\n12944:\tBTF_KFUNCS_END(bpf_sk_iter_kfunc_ids)\n12945:\t\n12946:\tstatic int tracing_iter_filter(const struct bpf_prog *prog, u32 kfunc_id)\n12947:\t{\n12948:\t\tif (btf_id_set8_contains(\u0026bpf_sk_iter_kfunc_ids, kfunc_id) \u0026\u0026\n12949:\t\t    prog-\u003eexpected_attach_type != BPF_TRACE_ITER)\n"
}

gemini-3.7-flash

null

null

							input: 6207
							output: 18
							thoughts: 225
						

**Analyzing Socket Destruction in the Kernel**

Okay, let's dive into this code snippet and figure out what's going on. I'm looking at a conditional statement here, specifically:

```c
if (!sk->sk_prot->diag_destroy || (sk->sk_protocol != IPPROTO_TCP &&
				   sk->sk_protocol != IPPROTO_UDP))
```

My initial thought is to understand the context. This looks like some sort of socket cleanup or destruction logic. Previously, the code checks for `diag_destroy`, but I see something that could be problematic: `sk->sk_protocol` is only reliable when `sk_fullsock(sk)` is true. If `sk` is *not* a "full socket," meaning it's something like a `inet_timewait_sock` or a `request_sock` (sockets derived from `sock_common`), then `sk->sk_protocol` either doesn't exist at all or it's at an offset that's invalid, and `sk_fullsock` is false. This is a crucial distinction.

Specifically, with timewait sockets, `sk_fullsock(sk)` is false. So, now, I need to know about `diag_destroy` for TCP timewait or non-fullsock instances. I'll need to check the function definition and how it handles these socket types. I'll need to grep through the codebase to trace the use of `diag_destroy` to fully understand what happens in the case of timewait sockets and sockets that are not full sockets.

{
  "Expression": "\\.diag_destroy"
}

{
  "Output": "net/ipv4/raw.c=948=struct proto raw_prot = {\n--\nnet/ipv4/raw.c-972-#endif\nnet/ipv4/raw.c:973:\t.diag_destroy\t   = raw_abort,\nnet/ipv4/raw.c-974-};\n--\nnet/ipv4/tcp_ipv4.c=3347=struct proto tcp_prot = {\n--\nnet/ipv4/tcp_ipv4.c-3395-\t.no_autobind\t\t= true,\nnet/ipv4/tcp_ipv4.c:3396:\t.diag_destroy\t\t= tcp_abort,\nnet/ipv4/tcp_ipv4.c-3397-};\n--\nnet/ipv4/udp.c=3143=struct proto udp_prot = {\n--\nnet/ipv4/udp.c-3173-\t.obj_size\t\t= sizeof(struct udp_sock),\nnet/ipv4/udp.c:3174:\t.diag_destroy\t\t= udp_abort,\nnet/ipv4/udp.c-3175-};\n--\nnet/ipv6/raw.c=1207=struct proto rawv6_prot = {\n--\nnet/ipv6/raw.c-1231-#endif\nnet/ipv6/raw.c:1232:\t.diag_destroy\t   = raw_abort,\nnet/ipv6/raw.c-1233-};\n--\nnet/ipv6/tcp_ipv6.c=2276=struct proto tcpv6_prot = {\n--\nnet/ipv6/tcp_ipv6.c-2325-\t.no_autobind\t\t= true,\nnet/ipv6/tcp_ipv6.c:2326:\t.diag_destroy\t\t= tcp_abort,\nnet/ipv6/tcp_ipv6.c-2327-};\n--\nnet/ipv6/udp.c=1908=struct proto udpv6_prot = {\n--\nnet/ipv6/udp.c-1940-\t.ipv6_pinfo_offset = offsetof(struct udp6_sock, inet6),\nnet/ipv6/udp.c:1941:\t.diag_destroy\t\t= udp_abort,\nnet/ipv6/udp.c-1942-};\n--\nnet/mptcp/subflow.c=2146=void __init mptcp_subflow_init(void)\n--\nnet/mptcp/subflow.c-2166-\ttcp_prot_override.release_cb = tcp_release_cb_override;\nnet/mptcp/subflow.c:2167:\ttcp_prot_override.diag_destroy = tcp_abort_override;\nnet/mptcp/subflow.c-2168-#ifdef CONFIG_BPF_SYSCALL\n--\nnet/mptcp/subflow.c=2180=void __init mptcp_subflow_v6_init(void)\n--\nnet/mptcp/subflow.c-2213-\ttcpv6_prot_override.release_cb = tcp_release_cb_override;\nnet/mptcp/subflow.c:2214:\ttcpv6_prot_override.diag_destroy = tcp_abort_override;\nnet/mptcp/subflow.c-2215-#ifdef CONFIG_BPF_SYSCALL\n"
}

gemini-3.7-flash

null

null

							input: 7655
							output: 19
							thoughts: 10
						

Okay, let's dive into this `tcp_abort` function. I need to understand its purpose and how it fits into the broader TCP/IP picture, especially considering [mention something specific to your field, e.g., "the application-level implications for high-throughput data transfer," or "the potential for abuse in DDoS attacks"].  I'm immediately thinking about error handling – what specific situations trigger this abort? Is it initiated by the local host, the remote host, or perhaps a timeout? I need to clarify the conditions.

**My Analysis of `tcp_abort`**

I have to consider the immediate impact on the connection, of course. Does it gracefully shut down the connection, attempt some sort of notification, or simply slam the door?  The level of detail required for the response is crucial, as this dictates recovery strategy, so I need to know how it informs the application. Are there any resource cleanup routines in this abort process?  It's critical to avoid resource leaks. Also, what is the impact on the receiving end?

Furthermore, I have to mentally model how this works with existing codebases. I immediately start thinking about how it behaves in practice. Could this have potential problems? Does this introduce latency? Is it efficient, or can we refactor for better efficiency? Is there any chance of data corruption or lost data? How does this work with other functions?

{
  "Expression": "int tcp_abort\\("
}

{
  "Output": "include/net/tcp.h=1704=void tcp_done(struct sock *sk);\ninclude/net/tcp.h:1705:int tcp_abort(struct sock *sk, int err);\ninclude/net/tcp.h-1706-\n--\nnet/ipv4/tcp.c=5089=void tcp_done(struct sock *sk)\n--\nnet/ipv4/tcp.c-5114-\nnet/ipv4/tcp.c:5115:int tcp_abort(struct sock *sk, int err)\nnet/ipv4/tcp.c-5116-{\n"
}

gemini-3.7-flash

null

null

							input: 8137
							output: 37
							thoughts: 23
						

Here's my summary, as if I were the one thinking it:

**Diving into the TCP Stack**

Okay, time to get my hands dirty. I want to understand a specific behavior in the Linux TCP implementation, so let's start by zeroing in on `net/ipv4/tcp.c`, specifically around line 5115. I know this area is likely related to the topic I'm investigating, but I need to get to the code and see exactly what's being done. From here I can extrapolate what's causing the problem. I'll need to go deeper after that.

{
  "File": "net/ipv4/tcp.c",
  "FirstLine": 5115,
  "LineCount": 40
}

{
  "Contents": "5115:\tint tcp_abort(struct sock *sk, int err)\n5116:\t{\n5117:\t\tint state = inet_sk_state_load(sk);\n5118:\t\n5119:\t\tif (state == TCP_NEW_SYN_RECV) {\n5120:\t\t\tstruct request_sock *req = inet_reqsk(sk);\n5121:\t\n5122:\t\t\tlocal_bh_disable();\n5123:\t\t\tinet_csk_reqsk_queue_drop(req-\u003ersk_listener, req);\n5124:\t\t\tlocal_bh_enable();\n5125:\t\t\treturn 0;\n5126:\t\t}\n5127:\t\tif (state == TCP_TIME_WAIT) {\n5128:\t\t\tstruct inet_timewait_sock *tw = inet_twsk(sk);\n5129:\t\n5130:\t\t\trefcount_inc(\u0026tw-\u003etw_refcnt);\n5131:\t\t\tlocal_bh_disable();\n5132:\t\t\tinet_twsk_deschedule_put(tw);\n5133:\t\t\tlocal_bh_enable();\n5134:\t\t\treturn 0;\n5135:\t\t}\n5136:\t\n5137:\t\t/* BPF context ensures sock locking. */\n5138:\t\tif (!has_current_bpf_ctx())\n5139:\t\t\t/* Don't race with userspace socket closes such as tcp_close. */\n5140:\t\t\tlock_sock(sk);\n5141:\t\n5142:\t\t/* Avoid closing the same socket twice. */\n5143:\t\tif (sk-\u003esk_state == TCP_CLOSE) {\n5144:\t\t\tif (!has_current_bpf_ctx())\n5145:\t\t\t\trelease_sock(sk);\n5146:\t\t\treturn -ENOENT;\n5147:\t\t}\n5148:\t\n5149:\t\tif (sk-\u003esk_state == TCP_LISTEN) {\n5150:\t\t\ttcp_set_state(sk, TCP_CLOSE);\n5151:\t\t\tinet_csk_listen_stop(sk);\n5152:\t\t}\n5153:\t\n5154:\t\t/* Don't race with BH socket closes such as inet_csk_listen_stop. */\n"
}

gemini-3.7-flash

null

null

							input: 8930
							output: 25
							thoughts: 433
						

**Analyzing the `bpf_sock_destroy` Patch**

Okay, so I'm looking at this patch for `bpf_sock_destroy` and immediately a few things jump out. The code's now handling `TCP_NEW_SYN_RECV` and `TCP_TIME_WAIT` states specifically, which is smart. Previously, the `bpf_sock_destroy` function had this check:

```c
if (!sk->sk_prot->diag_destroy || (sk->sk_protocol != IPPROTO_TCP &&
				   sk->sk_protocol != IPPROTO_UDP))
	return -EOPNOTSUPP;
```

The issue here, and the crux of this patch, is that for non-full sockets, like those in `TCP_TIME_WAIT` or `TCP_NEW_SYN_RECV`, `sk->sk_protocol` was being read from potentially uninitialized or non-protocol memory. That's a classic recipe for problems, leading to unexpected behavior or outright failures, especially in the context of `request_sock` or `timewait_sock`.

With this patch, the check on `sk->sk_protocol` is only performed if `sk_fullsock(sk)` is true. That's a significant improvement. It means we can now call `sk->sk_prot->diag_destroy(sk, ECONNABORTED)` on these non-full sockets.

Crucially, this change is in `net/core/filter.c`, specifically within `bpf_sock_destroy`. This is a BPF kfunc, which means it's exposed to BPF iterators, like the ones used with `iter/tcp`. This is *reachable* kernel code from BPF and core networking, which is a major point to consider.

My immediate thought is, should this be fuzzed? Absolutely! This opens the door for BPF programs to destroy timewait/request sockets via `bpf_sock_destroy(sk_common)`. This is now reachable through BPF iterators, specifically when `BPF_TRACE_ITER` is used, such as with iter/tcp and iter/udp.

Let me take a quick look at the required configurations for `bpf_sock_destroy` and the BPF iterators in `net/core/filter.c`, just to be certain. I'll also see where the `bpf_sk_iter_kfunc_ids` and `bpf_sock_destroy` functions are registered. This is important for understanding the scope of the change and where it can be applied.

{
  "Expression": "bpf_sk_iter_kfunc_ids"
}

{
  "Output": "net/core/filter.c=12940=__bpf_kfunc_end_defs();\nnet/core/filter.c-12941-\nnet/core/filter.c:12942:BTF_KFUNCS_START(bpf_sk_iter_kfunc_ids)\nnet/core/filter.c-12943-BTF_ID_FLAGS(func, bpf_sock_destroy)\nnet/core/filter.c:12944:BTF_KFUNCS_END(bpf_sk_iter_kfunc_ids)\nnet/core/filter.c-12945-\nnet/core/filter.c=12946=static int tracing_iter_filter(const struct bpf_prog *prog, u32 kfunc_id)\nnet/core/filter.c-12947-{\nnet/core/filter.c:12948:\tif (btf_id_set8_contains(\u0026bpf_sk_iter_kfunc_ids, kfunc_id) \u0026\u0026\nnet/core/filter.c-12949-\t    prog-\u003eexpected_attach_type != BPF_TRACE_ITER)\n--\nnet/core/filter.c=12954=static const struct btf_kfunc_id_set bpf_sk_iter_kfunc_set = {\nnet/core/filter.c-12955-\t.owner = THIS_MODULE,\nnet/core/filter.c:12956:\t.set   = \u0026bpf_sk_iter_kfunc_ids,\nnet/core/filter.c-12957-\t.filter = tracing_iter_filter,\n"
}

gemini-3.7-flash

null

null

							input: 10371
							output: 25
							thoughts: 30
						

Here's my thinking process:

**Diving into eBPF and Network Filtering**

Okay, so I'm looking at `bpf_sk_iter_kfunc_set`, specifically where it's *used* within `net/core/filter.c`. I need to understand its role in the network filtering context. I'm guessing this function is central to some aspect of socket-level filtering or iteration, potentially related to eBPF programs attached to sockets or network namespaces. I want to see the surrounding code, the calling context, how the parameters are being used. Are we talking about attaching programs, setting up iterators, applying filters, manipulating socket options, or what? The goal is to piece together its functionality and understand the control flow. This investigation should give me insight into how the kernel uses this mechanism for network traffic management and filtering at a lower level. My hope is this will reveal new aspects for optimization or possibly vulnerability detection in my area of expertise.

{
  "Expression": "bpf_sk_iter_kfunc_set"
}

{
  "Output": "net/core/filter.c=12946=static int tracing_iter_filter(const struct bpf_prog *prog, u32 kfunc_id)\n--\nnet/core/filter.c-12953-\nnet/core/filter.c:12954:static const struct btf_kfunc_id_set bpf_sk_iter_kfunc_set = {\nnet/core/filter.c-12955-\t.owner = THIS_MODULE,\n--\nnet/core/filter.c=12960=static int init_subsystem(void)\nnet/core/filter.c-12961-{\nnet/core/filter.c:12962:\treturn register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, \u0026bpf_sk_iter_kfunc_set);\nnet/core/filter.c-12963-}\n"
}

gemini-3.7-flash

null

null

							input: 10871
							output: 37
							thoughts: 32
						

Here's my take on those `ifdef` blocks around lines 12900-12970 in `net/core/filter.c`.

**Diving into the Conditional Compilation in `net/core/filter.c`**

Okay, let's zero in on lines 12900 through 12970 of `net/core/filter.c`. I need to get a clear picture of what's being conditionally compiled here. Given my experience, I'm expecting this section deals with some specific feature, hardware, or perhaps an optimization that isn't universally applicable. I suspect it relates to packet filtering, likely involving some specific BPF (Berkeley Packet Filter) logic or interaction with a particular NIC (Network Interface Controller) or hardware accelerator. The use of preprocessor directives is a dead giveaway that we are dealing with optional, configurable code paths.

I'll be looking closely at the conditions within the `#ifdef` blocks. I need to figure out what defines are being checked – what *feature flags* are controlling the inclusion of this code? Knowing that will tell me why this code isn't always active and which parts of the kernel config would enable it. Are these related to hardware capabilities, kernel features, or perhaps even user-space configuration settings? It could be something like support for a particular BPF instruction set or an optimization that relies on a specific NIC’s capabilities. I’m prepared to find that this could be related to some obscure hardware support, or specific packet manipulation.

I'll also keep an eye out for any comments in this section. Those could offer valuable clues to explain why this conditional compilation is necessary and how this code interacts with the rest of the filtering engine. My goal is to figure out the exact scenarios in which this particular code is being utilized, as well as the design considerations that made conditional compilation the right approach here.

{
  "File": "net/core/filter.c",
  "FirstLine": 12900,
  "LineCount": 70
}

{
  "Contents": "12900:\t\n12901:\t__bpf_kfunc_start_defs();\n12902:\t\n12903:\t/* bpf_sock_destroy: Destroy the given socket with ECONNABORTED error code.\n12904:\t *\n12905:\t * The function expects a non-NULL pointer to a socket, and invokes the\n12906:\t * protocol specific socket destroy handlers.\n12907:\t *\n12908:\t * The helper can only be called from BPF contexts that have acquired the socket\n12909:\t * locks.\n12910:\t *\n12911:\t * Parameters:\n12912:\t * @sock: Pointer to socket to be destroyed\n12913:\t *\n12914:\t * Return:\n12915:\t * On error, may return EOPNOTSUPP, or whatever the protocol specific\n12916:\t * destroy handler returns.\n12917:\t * EOPNOTSUPP if protocol specific destroy handler is not supported.\n12918:\t * 0 otherwise\n12919:\t */\n12920:\t__bpf_kfunc int bpf_sock_destroy(struct sock_common *sock)\n12921:\t{\n12922:\t\tstruct sock *sk = (struct sock *)sock;\n12923:\t\n12924:\t\t/* The locking semantics that allow for synchronous execution of the\n12925:\t\t * destroy handlers are only supported for TCP and UDP.\n12926:\t\t * Supporting protocols will need to acquire sock lock in the BPF context\n12927:\t\t * prior to invoking this kfunc.\n12928:\t\t */\n12929:\t\tif (!sk-\u003esk_prot-\u003ediag_destroy)\n12930:\t\t\treturn -EOPNOTSUPP;\n12931:\t\n12932:\t\tif (sk_fullsock(sk) \u0026\u0026\n12933:\t\t    sk-\u003esk_protocol != IPPROTO_TCP \u0026\u0026\n12934:\t\t    sk-\u003esk_protocol != IPPROTO_UDP)\n12935:\t\t\treturn -EOPNOTSUPP;\n12936:\t\n12937:\t\treturn sk-\u003esk_prot-\u003ediag_destroy(sk, ECONNABORTED);\n12938:\t}\n12939:\t\n12940:\t__bpf_kfunc_end_defs();\n12941:\t\n12942:\tBTF_KFUNCS_START(bpf_sk_iter_kfunc_ids)\n12943:\tBTF_ID_FLAGS(func, bpf_sock_destroy)\n12944:\tBTF_KFUNCS_END(bpf_sk_iter_kfunc_ids)\n12945:\t\n12946:\tstatic int tracing_iter_filter(const struct bpf_prog *prog, u32 kfunc_id)\n12947:\t{\n12948:\t\tif (btf_id_set8_contains(\u0026bpf_sk_iter_kfunc_ids, kfunc_id) \u0026\u0026\n12949:\t\t    prog-\u003eexpected_attach_type != BPF_TRACE_ITER)\n12950:\t\t\treturn -EACCES;\n12951:\t\treturn 0;\n12952:\t}\n12953:\t\n12954:\tstatic const struct btf_kfunc_id_set bpf_sk_iter_kfunc_set = {\n12955:\t\t.owner = THIS_MODULE,\n12956:\t\t.set   = \u0026bpf_sk_iter_kfunc_ids,\n12957:\t\t.filter = tracing_iter_filter,\n12958:\t};\n12959:\t\n12960:\tstatic int init_subsystem(void)\n12961:\t{\n12962:\t\treturn register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, \u0026bpf_sk_iter_kfunc_set);\n12963:\t}\n12964:\tlate_initcall(init_subsystem);\n"
}

gemini-3.7-flash

null

null

							input: 12432
							output: 26
							thoughts: 53
						

Okay, let's dive into this.

**Investigating Network Filter Compilation Dependencies**

My initial thought is to figure out the compilation dependencies for `net/core/filter.c`. Given my expertise, I suspect the crucial information will be found in either `net/core/Makefile` or perhaps the `Kconfig` files within the `net/core` directory. My aim is to determine under which configuration options `net/core/filter.c` is compiled. It's highly likely that understanding the `CONFIG_` flags is key here. I'll need to check if things like `CONFIG_BPF_SYSCALL` or the broader `CONFIG_NET` are required or influence the inclusion of this filter code. Knowing those dependencies will give me a clear picture of how and when this module gets built.

{
  "Expression": "filter\\.o",
  "PathPrefix": "net/core"
}

{
  "Output": "net/core/Makefile=12=obj-y\t\t     += dev.o dev_api.o dev_addr_lists.o dst.o netevent.o \\\nnet/core/Makefile:13:\t\t\tneighbour.o rtnetlink.o utils.o link_watch.o filter.o \\\nnet/core/Makefile-14-\t\t\tsock_diag.o dev_ioctl.o tso.o sock_reuseport.o \\\n--\nnet/core/pktgen.c-87- *\nnet/core/pktgen.c:88: * Remove if fix from added Harald Welte \u003claforge@netfilter.org\u003e 040419\nnet/core/pktgen.c-89- * ia64 compilation fix from  Aron Griffis \u003caron@hp.com\u003e 040604\n"
}

gemini-3.7-flash

null

null

							input: 12890
							output: 25
							thoughts: 52
						

Okay, here's my take on those thoughts, framed as my own:

**Investigating the Dependency of BPF Syscall Support**

Alright, time to get to the bottom of this. I need to figure out if `CONFIG_BPF_SYSCALL` is a prerequisite for kfuncs or, more specifically, for the registration of BTF kfunc ID sets through `register_btf_kfunc_id_set`. My immediate instinct is to check for any direct dependencies or code paths. Let's fire up a `grep` and search the kernel source for instances of `register_btf_kfunc_id_set`. That should quickly reveal any direct relationships and whether the presence or absence of that config option factors into its existence or behavior. It's a fundamental step; I can't start optimizing or integrating until I'm absolutely sure about these base dependencies. Let's see what the grep search turns up!

{
  "Expression": "register_btf_kfunc_id_set"
}

{
  "Output": "Documentation/bpf/kfuncs.rst=494=type. An example is shown below::\n--\nDocumentation/bpf/kfuncs.rst-507-        {\nDocumentation/bpf/kfuncs.rst:508:                return register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, \u0026bpf_task_kfunc_set);\nDocumentation/bpf/kfuncs.rst-509-        }\n--\ndrivers/base/power/wakeup.c=1227=static void __init wakeup_sources_bpf_init(void)\ndrivers/base/power/wakeup.c-1228-{\ndrivers/base/power/wakeup.c:1229:\tif (register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, \u0026wakeup_source_kfunc_set))\ndrivers/base/power/wakeup.c-1230-\t\tpm_pr_dbg(\"Wakeup: failed to register BTF kfuncs\\n\");\n--\ndrivers/hid/bpf/hid_bpf_dispatch.c=658=static int __init hid_bpf_init(void)\n--\ndrivers/hid/bpf/hid_bpf_dispatch.c-667-\ndrivers/hid/bpf/hid_bpf_dispatch.c:668:\terr = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS, \u0026hid_bpf_kfunc_set);\ndrivers/hid/bpf/hid_bpf_dispatch.c-669-\tif (err) {\n--\ndrivers/hid/bpf/hid_bpf_dispatch.c-673-\ndrivers/hid/bpf/hid_bpf_dispatch.c:674:\terr = register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, \u0026hid_bpf_syscall_kfunc_set);\ndrivers/hid/bpf/hid_bpf_dispatch.c-675-\tif (err) {\n--\nfs/binfmt_misc_bpf.c=321=static int bm_bpf_init(struct btf *btf)\nfs/binfmt_misc_bpf.c-322-{\nfs/binfmt_misc_bpf.c:323:\treturn register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS,\nfs/binfmt_misc_bpf.c-324-\t\t\t\t\t \u0026bm_bpf_kfunc_set);\n--\nfs/bpf_fs_kfuncs.c=492=static int __init bpf_fs_kfuncs_init(void)\n--\nfs/bpf_fs_kfuncs.c-495-\nfs/bpf_fs_kfuncs.c:496:\tret = register_btf_kfunc_id_set(BPF_PROG_TYPE_LSM, \u0026bpf_fs_kfunc_set);\nfs/bpf_fs_kfuncs.c-497-\tif (ret || !IS_ENABLED(CONFIG_BINFMT_MISC_BPF))\nfs/bpf_fs_kfuncs.c-498-\t\treturn ret;\nfs/bpf_fs_kfuncs.c:499:\treturn register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS,\nfs/bpf_fs_kfuncs.c-500-\t\t\t\t\t \u0026bpf_fs_kfunc_set);\n--\nfs/verity/measure.c=186=void __init fsverity_init_bpf(void)\nfs/verity/measure.c-187-{\nfs/verity/measure.c:188:\tregister_btf_kfunc_id_set(BPF_PROG_TYPE_LSM, \u0026bpf_fsverity_set);\nfs/verity/measure.c-189-}\n--\ninclude/linux/btf.h=587=u32 *btf_kfunc_is_modify_return(const struct btf *btf, u32 kfunc_btf_id,\ninclude/linux/btf.h-588-\t\t\t\tconst struct bpf_prog *prog);\ninclude/linux/btf.h:589:int register_btf_kfunc_id_set(enum bpf_prog_type prog_type,\ninclude/linux/btf.h-590-\t\t\t      const struct btf_kfunc_id_set *s);\n--\ninclude/linux/btf.h=647=static inline u32 *btf_kfunc_id_set_contains(const struct btf *btf,\n--\ninclude/linux/btf.h-653-}\ninclude/linux/btf.h:654:static inline int register_btf_kfunc_id_set(enum bpf_prog_type prog_type,\ninclude/linux/btf.h-655-\t\t\t\t\t    const struct btf_kfunc_id_set *s)\n--\nio_uring/bpf-ops.c=120=static int bpf_io_init(struct btf *btf)\n--\nio_uring/bpf-ops.c-129-\nio_uring/bpf-ops.c:130:\tret = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS,\nio_uring/bpf-ops.c-131-\t\t\t\t\t\u0026bpf_io_uring_kfunc_set);\n--\nkernel/bpf/arena.c=1131=static int __init kfunc_init(void)\nkernel/bpf/arena.c-1132-{\nkernel/bpf/arena.c:1133:\treturn register_btf_kfunc_id_set(BPF_PROG_TYPE_UNSPEC, \u0026common_kfunc_set);\nkernel/bpf/arena.c-1134-}\n--\nkernel/bpf/btf.c=8902=static int btf_populate_kfunc_set(struct btf *btf, enum btf_kfunc_hook hook,\n--\nkernel/bpf/btf.c-8948-\tset = tab-\u003esets[hook];\nkernel/bpf/btf.c:8949:\t/* Warn when register_btf_kfunc_id_set is called twice for the same hook\nkernel/bpf/btf.c-8950-\t * for module sets.\n--\nkernel/bpf/btf.c=9173=u32 *btf_kfunc_is_modify_return(const struct btf *btf, u32 kfunc_btf_id,\n--\nkernel/bpf/btf.c-9181-\nkernel/bpf/btf.c:9182:static int __register_btf_kfunc_id_set(enum btf_kfunc_hook hook,\nkernel/bpf/btf.c-9183-\t\t\t\t       const struct btf_kfunc_id_set *kset)\n--\nkernel/bpf/btf.c-9208-/* This function must be invoked only from initcalls/module init functions */\nkernel/bpf/btf.c:9209:int register_btf_kfunc_id_set(enum bpf_prog_type prog_type,\nkernel/bpf/btf.c-9210-\t\t\t      const struct btf_kfunc_id_set *kset)\n--\nkernel/bpf/btf.c-9222-\thook = bpf_prog_type_to_kfunc_hook(prog_type);\nkernel/bpf/btf.c:9223:\treturn __register_btf_kfunc_id_set(hook, kset);\nkernel/bpf/btf.c-9224-}\nkernel/bpf/btf.c:9225:EXPORT_SYMBOL_GPL(register_btf_kfunc_id_set);\nkernel/bpf/btf.c-9226-\n--\nkernel/bpf/btf.c=9228=int register_btf_fmodret_id_set(const struct btf_kfunc_id_set *kset)\nkernel/bpf/btf.c-9229-{\nkernel/bpf/btf.c:9230:\treturn __register_btf_kfunc_id_set(BTF_KFUNC_HOOK_FMODRET, kset);\nkernel/bpf/btf.c-9231-}\n--\nkernel/bpf/cpumask.c=515=static int __init cpumask_kfunc_init(void)\n--\nkernel/bpf/cpumask.c-525-\tret = bpf_mem_alloc_init(\u0026bpf_cpumask_ma, sizeof(struct bpf_cpumask), false);\nkernel/bpf/cpumask.c:526:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, \u0026cpumask_kfunc_set);\nkernel/bpf/cpumask.c:527:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS, \u0026cpumask_kfunc_set);\nkernel/bpf/cpumask.c:528:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, \u0026cpumask_kfunc_set);\nkernel/bpf/cpumask.c-529-\treturn  ret ?: register_btf_id_dtor_kfuncs(cpumask_dtors,\n--\nkernel/bpf/crypto.c=379=static int __init crypto_kfunc_init(void)\n--\nkernel/bpf/crypto.c-388-\nkernel/bpf/crypto.c:389:\tret = register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, \u0026crypt_kfunc_set);\nkernel/bpf/crypto.c:390:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_ACT, \u0026crypt_kfunc_set);\nkernel/bpf/crypto.c:391:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_XDP, \u0026crypt_kfunc_set);\nkernel/bpf/crypto.c:392:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL,\nkernel/bpf/crypto.c-393-\t\t\t\t\t       \u0026crypt_init_kfunc_set);\n--\nkernel/bpf/helpers.c=4982=static int __init kfunc_init(void)\n--\nkernel/bpf/helpers.c-4997-\nkernel/bpf/helpers.c:4998:\tret = register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, \u0026generic_kfunc_set);\nkernel/bpf/helpers.c:4999:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, \u0026generic_kfunc_set);\nkernel/bpf/helpers.c:5000:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_XDP, \u0026generic_kfunc_set);\nkernel/bpf/helpers.c:5001:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS, \u0026generic_kfunc_set);\nkernel/bpf/helpers.c:5002:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, \u0026generic_kfunc_set);\nkernel/bpf/helpers.c:5003:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_CGROUP_SKB, \u0026generic_kfunc_set);\nkernel/bpf/helpers.c-5004-\tret = ret ?: register_btf_id_dtor_kfuncs(generic_dtors,\n--\nkernel/bpf/helpers.c-5006-\t\t\t\t\t\t  THIS_MODULE);\nkernel/bpf/helpers.c:5007:\treturn ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_UNSPEC, \u0026common_kfunc_set);\nkernel/bpf/helpers.c-5008-}\n--\nkernel/bpf/map_iter.c=230=static int init_subsystem(void)\nkernel/bpf/map_iter.c-231-{\nkernel/bpf/map_iter.c:232:\treturn register_btf_kfunc_id_set(BPF_PROG_TYPE_UNSPEC, \u0026bpf_map_iter_kfunc_set);\nkernel/bpf/map_iter.c-233-}\n--\nkernel/bpf/rqspinlock.c=759=static __init int rqspinlock_register_kfuncs(void)\nkernel/bpf/rqspinlock.c-760-{\nkernel/bpf/rqspinlock.c:761:\treturn register_btf_kfunc_id_set(BPF_PROG_TYPE_UNSPEC, \u0026rqspinlock_kfunc_set);\nkernel/bpf/rqspinlock.c-762-}\n--\nkernel/cgroup/rstat.c=766=static int __init bpf_rstat_kfunc_init(void)\nkernel/cgroup/rstat.c-767-{\nkernel/cgroup/rstat.c:768:\treturn register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING,\nkernel/cgroup/rstat.c-769-\t\t\t\t\t \u0026bpf_rstat_kfunc_set);\n--\nkernel/sched/ext/cid.c=1160=int scx_cid_kfunc_init(void)\nkernel/sched/ext/cid.c-1161-{\nkernel/sched/ext/cid.c:1162:\treturn register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS, \u0026scx_kfunc_set_init_cids) ?:\nkernel/sched/ext/cid.c:1163:\t\tregister_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS, \u0026scx_kfunc_set_cid) ?:\nkernel/sched/ext/cid.c:1164:\t\tregister_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, \u0026scx_kfunc_set_cid) ?:\nkernel/sched/ext/cid.c:1165:\t\tregister_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, \u0026scx_kfunc_set_cid);\nkernel/sched/ext/cid.c-1166-}\n--\nkernel/sched/ext/ext.c=10898=static int __init scx_init(void)\n--\nkernel/sched/ext/ext.c-10976-\t * kfunc registration can't be done from init_sched_ext_class() as\nkernel/sched/ext/ext.c:10977:\t * register_btf_kfunc_id_set() needs most of the system to be up.\nkernel/sched/ext/ext.c-10978-\t *\n--\nkernel/sched/ext/ext.c-10986-\t */\nkernel/sched/ext/ext.c:10987:\tif ((ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS,\nkernel/sched/ext/ext.c-10988-\t\t\t\t\t     \u0026scx_kfunc_set_enqueue_dispatch)) ||\nkernel/sched/ext/ext.c:10989:\t    (ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS,\nkernel/sched/ext/ext.c-10990-\t\t\t\t\t     \u0026scx_kfunc_set_dispatch)) ||\nkernel/sched/ext/ext.c:10991:\t    (ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS,\nkernel/sched/ext/ext.c-10992-\t\t\t\t\t     \u0026scx_kfunc_set_cpu_release)) ||\nkernel/sched/ext/ext.c:10993:\t    (ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS,\nkernel/sched/ext/ext.c-10994-\t\t\t\t\t     \u0026scx_kfunc_set_unlocked)) ||\nkernel/sched/ext/ext.c:10995:\t    (ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL,\nkernel/sched/ext/ext.c-10996-\t\t\t\t\t     \u0026scx_kfunc_set_unlocked)) ||\nkernel/sched/ext/ext.c:10997:\t    (ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS,\nkernel/sched/ext/ext.c-10998-\t\t\t\t\t     \u0026scx_kfunc_set_any)) ||\nkernel/sched/ext/ext.c:10999:\t    (ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING,\nkernel/sched/ext/ext.c-11000-\t\t\t\t\t     \u0026scx_kfunc_set_any)) ||\nkernel/sched/ext/ext.c:11001:\t    (ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL,\nkernel/sched/ext/ext.c-11002-\t\t\t\t\t     \u0026scx_kfunc_set_any))) {\n--\nkernel/sched/ext/idle.c=1554=int scx_idle_init(void)\nkernel/sched/ext/idle.c-1555-{\nkernel/sched/ext/idle.c:1556:\treturn register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS, \u0026scx_kfunc_set_idle) ?:\nkernel/sched/ext/idle.c:1557:\t       register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, \u0026scx_kfunc_set_idle) ?:\nkernel/sched/ext/idle.c:1558:\t       register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, \u0026scx_kfunc_set_idle) ?:\nkernel/sched/ext/idle.c:1559:\t       register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS, \u0026scx_kfunc_set_select_cpu) ?:\nkernel/sched/ext/idle.c:1560:\t       register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, \u0026scx_kfunc_set_select_cpu);\nkernel/sched/ext/idle.c-1561-}\n--\nkernel/trace/bpf_trace.c=3459=static int __init bpf_trace_kfuncs_init(void)\n--\nkernel/trace/bpf_trace.c-3462-\nkernel/trace/bpf_trace.c:3463:\terr = err ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_KPROBE, \u0026bpf_session_kfunc_set);\nkernel/trace/bpf_trace.c:3464:\terr = err ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, \u0026bpf_session_kfunc_set);\nkernel/trace/bpf_trace.c-3465-\n--\nmm/bpf_memcontrol.c=182=static int __init bpf_memcontrol_init(void)\n--\nmm/bpf_memcontrol.c-185-\nmm/bpf_memcontrol.c:186:\terr = register_btf_kfunc_id_set(BPF_PROG_TYPE_UNSPEC,\nmm/bpf_memcontrol.c-187-\t\t\t\t\t\u0026bpf_memcontrol_kfunc_set);\n--\nnet/bpf/test_run.c=1888=static int __init bpf_prog_test_run_init(void)\n--\nnet/bpf/test_run.c-1902-\tret = register_btf_fmodret_id_set(\u0026bpf_test_modify_return_set);\nnet/bpf/test_run.c:1903:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, \u0026bpf_prog_test_kfunc_set);\nnet/bpf/test_run.c:1904:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, \u0026bpf_prog_test_kfunc_set);\nnet/bpf/test_run.c:1905:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, \u0026bpf_prog_test_kfunc_set);\nnet/bpf/test_run.c-1906-\treturn ret ?: register_btf_id_dtor_kfuncs(bpf_prog_test_dtor_kfunc,\n--\nnet/core/bpf_ksock.c=307=static int __init bpf_ksock_kfunc_init(void)\n--\nnet/core/bpf_ksock.c-316-\nnet/core/bpf_ksock.c:317:\tret = register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL,\nnet/core/bpf_ksock.c-318-\t\t\t\t\t\u0026ksock_init_kfunc_set);\nnet/core/bpf_ksock.c:319:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL,\nnet/core/bpf_ksock.c-320-\t\t\t\t\t       \u0026ksock_kfunc_set);\nnet/core/bpf_ksock.c:321:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LSM,\nnet/core/bpf_ksock.c-322-\t\t\t\t\t       \u0026ksock_kfunc_set);\n--\nnet/core/filter.c=12875=static int __init bpf_kfunc_init(void)\n--\nnet/core/filter.c-12878-\nnet/core/filter.c:12879:\tret = register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, \u0026bpf_kfunc_set_skb);\nnet/core/filter.c:12880:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_ACT, \u0026bpf_kfunc_set_skb);\nnet/core/filter.c:12881:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SK_SKB, \u0026bpf_kfunc_set_skb);\nnet/core/filter.c:12882:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SOCKET_FILTER, \u0026bpf_kfunc_set_skb);\nnet/core/filter.c:12883:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_CGROUP_SKB, \u0026bpf_kfunc_set_skb);\nnet/core/filter.c:12884:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_OUT, \u0026bpf_kfunc_set_skb);\nnet/core/filter.c:12885:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_IN, \u0026bpf_kfunc_set_skb);\nnet/core/filter.c:12886:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_XMIT, \u0026bpf_kfunc_set_skb);\nnet/core/filter.c:12887:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_SEG6LOCAL, \u0026bpf_kfunc_set_skb);\nnet/core/filter.c:12888:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_NETFILTER, \u0026bpf_kfunc_set_skb);\nnet/core/filter.c:12889:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, \u0026bpf_kfunc_set_skb);\nnet/core/filter.c:12890:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, \u0026bpf_kfunc_set_skb_meta);\nnet/core/filter.c:12891:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_ACT, \u0026bpf_kfunc_set_skb_meta);\nnet/core/filter.c:12892:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_XDP, \u0026bpf_kfunc_set_xdp);\nnet/core/filter.c:12893:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_CGROUP_SOCK_ADDR,\nnet/core/filter.c-12894-\t\t\t\t\t       \u0026bpf_kfunc_set_sock_addr);\nnet/core/filter.c:12895:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, \u0026bpf_kfunc_set_tcp_reqsk);\nnet/core/filter.c:12896:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_CGROUP_SKB, \u0026bpf_kfunc_set_icmp_send);\nnet/core/filter.c:12897:\treturn ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SOCK_OPS, \u0026bpf_kfunc_set_sock_ops);\nnet/core/filter.c-12898-}\n--\nnet/core/filter.c=12960=static int init_subsystem(void)\nnet/core/filter.c-12961-{\nnet/core/filter.c:12962:\treturn register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, \u0026bpf_sk_iter_kfunc_set);\nnet/core/filter.c-12963-}\n--\nnet/core/xdp.c=993=static int __init xdp_metadata_init(void)\nnet/core/xdp.c-994-{\nnet/core/xdp.c:995:\treturn register_btf_kfunc_id_set(BPF_PROG_TYPE_XDP, \u0026xdp_metadata_kfunc_set);\nnet/core/xdp.c-996-}\n--\nnet/ipv4/bpf_tcp_ca.c=345=static int __init bpf_tcp_ca_kfunc_init(void)\n--\nnet/ipv4/bpf_tcp_ca.c-348-\nnet/ipv4/bpf_tcp_ca.c:349:\tret = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS, \u0026bpf_tcp_ca_kfunc_set);\nnet/ipv4/bpf_tcp_ca.c-350-\tret = ret ?: register_bpf_struct_ops(\u0026bpf_tcp_congestion_ops, tcp_congestion_ops);\n--\nnet/ipv4/fou_bpf.c=113=int register_fou_bpf(void)\nnet/ipv4/fou_bpf.c-114-{\nnet/ipv4/fou_bpf.c:115:\treturn register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS,\nnet/ipv4/fou_bpf.c-116-\t\t\t\t\t \u0026fou_bpf_kfunc_set);\n--\nnet/ipv4/tcp_bbr.c=1175=static int __init bbr_register(void)\n--\nnet/ipv4/tcp_bbr.c-1180-\nnet/ipv4/tcp_bbr.c:1181:\tret = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS, \u0026tcp_bbr_kfunc_set);\nnet/ipv4/tcp_bbr.c-1182-\tif (ret \u003c 0)\n--\nnet/ipv4/tcp_cubic.c=501=static int __init cubictcp_register(void)\n--\nnet/ipv4/tcp_cubic.c-534-\nnet/ipv4/tcp_cubic.c:535:\tret = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS, \u0026tcp_cubic_kfunc_set);\nnet/ipv4/tcp_cubic.c-536-\tif (ret \u003c 0)\n--\nnet/ipv4/tcp_dctcp.c=294=static int __init dctcp_register(void)\n--\nnet/ipv4/tcp_dctcp.c-299-\nnet/ipv4/tcp_dctcp.c:300:\tret = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS, \u0026tcp_dctcp_kfunc_set);\nnet/ipv4/tcp_dctcp.c-301-\tif (ret \u003c 0)\n--\nnet/netfilter/nf_conntrack_bpf.c=540=int register_nf_conntrack_bpf(void)\n--\nnet/netfilter/nf_conntrack_bpf.c-543-\nnet/netfilter/nf_conntrack_bpf.c:544:\tret = register_btf_kfunc_id_set(BPF_PROG_TYPE_XDP, \u0026nf_conntrack_kfunc_set);\nnet/netfilter/nf_conntrack_bpf.c:545:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, \u0026nf_conntrack_kfunc_set);\nnet/netfilter/nf_conntrack_bpf.c-546-\tif (!ret) {\n--\nnet/netfilter/nf_flow_table_bpf.c=116=int nf_flow_register_bpf(void)\nnet/netfilter/nf_flow_table_bpf.c-117-{\nnet/netfilter/nf_flow_table_bpf.c:118:\treturn register_btf_kfunc_id_set(BPF_PROG_TYPE_XDP,\nnet/netfilter/nf_flow_table_bpf.c-119-\t\t\t\t\t \u0026nf_flow_kfunc_set);\n--\nnet/netfilter/nf_nat_bpf.c=66=int register_nf_nat_bpf(void)\n--\nnet/netfilter/nf_nat_bpf.c-69-\nnet/netfilter/nf_nat_bpf.c:70:\tret = register_btf_kfunc_id_set(BPF_PROG_TYPE_XDP,\nnet/netfilter/nf_nat_bpf.c-71-\t\t\t\t\t\u0026nf_bpf_nat_kfunc_set);\n--\nnet/netfilter/nf_nat_bpf.c-74-\nnet/netfilter/nf_nat_bpf.c:75:\treturn register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS,\nnet/netfilter/nf_nat_bpf.c-76-\t\t\t\t\t \u0026nf_bpf_nat_kfunc_set);\n--\nnet/sched/bpf_qdisc.c=460=static int __init bpf_qdisc_kfunc_init(void)\n--\nnet/sched/bpf_qdisc.c-469-\nnet/sched/bpf_qdisc.c:470:\tret = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS, \u0026bpf_qdisc_kfunc_set);\nnet/sched/bpf_qdisc.c-471-\tret = ret ?: register_btf_id_dtor_kfuncs(skb_kfunc_dtors,\n--\nnet/xfrm/xfrm_interface_bpf.c=106=int __init register_xfrm_interface_bpf(void)\nnet/xfrm/xfrm_interface_bpf.c-107-{\nnet/xfrm/xfrm_interface_bpf.c:108:\treturn register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS,\nnet/xfrm/xfrm_interface_bpf.c-109-\t\t\t\t\t \u0026xfrm_interface_kfunc_set);\n--\nnet/xfrm/xfrm_state_bpf.c=130=int __init register_xfrm_state_bpf(void)\nnet/xfrm/xfrm_state_bpf.c-131-{\nnet/xfrm/xfrm_state_bpf.c:132:\treturn register_btf_kfunc_id_set(BPF_PROG_TYPE_XDP,\nnet/xfrm/xfrm_state_bpf.c-133-\t\t\t\t\t \u0026xfrm_state_xdp_kfunc_set);\n--\ntools/testing/selftests/bpf/test_kmods/bpf_test_modorder_x.c=25=static int __init bpf_test_modorder_x_init(void)\ntools/testing/selftests/bpf/test_kmods/bpf_test_modorder_x.c-26-{\ntools/testing/selftests/bpf/test_kmods/bpf_test_modorder_x.c:27:\treturn register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS,\ntools/testing/selftests/bpf/test_kmods/bpf_test_modorder_x.c-28-\t\t\t\t\t \u0026bpf_test_modorder_x_set);\n--\ntools/testing/selftests/bpf/test_kmods/bpf_test_modorder_y.c=25=static int __init bpf_test_modorder_y_init(void)\ntools/testing/selftests/bpf/test_kmods/bpf_test_modorder_y.c-26-{\ntools/testing/selftests/bpf/test_kmods/bpf_test_modorder_y.c:27:\treturn register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS,\ntools/testing/selftests/bpf/test_kmods/bpf_test_modorder_y.c-28-\t\t\t\t\t \u0026bpf_test_modorder_y_set);\n--\ntools/testing/selftests/bpf/test_kmods/bpf_testmod.c=2130=static int bpf_testmod_init(void)\n--\ntools/testing/selftests/bpf/test_kmods/bpf_testmod.c-2140-\ntools/testing/selftests/bpf/test_kmods/bpf_testmod.c:2141:\tret = register_btf_kfunc_id_set(BPF_PROG_TYPE_UNSPEC, \u0026bpf_testmod_common_kfunc_set);\ntools/testing/selftests/bpf/test_kmods/bpf_testmod.c:2142:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, \u0026bpf_testmod_kfunc_set);\ntools/testing/selftests/bpf/test_kmods/bpf_testmod.c:2143:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, \u0026bpf_testmod_kfunc_set);\ntools/testing/selftests/bpf/test_kmods/bpf_testmod.c:2144:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, \u0026bpf_testmod_kfunc_set);\ntools/testing/selftests/bpf/test_kmods/bpf_testmod.c:2145:\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS, \u0026bpf_testmod_kfunc_set);\ntools/testing/selftests/bpf/test_kmods/bpf_testmod.c-2146-\tret = ret ?: register_btf_fmodret_id_set(\u0026bpf_testmod_trampoline_count_fmodret_set);\n"
}

gemini-3.7-flash

null

null

							input: 22816
							output: 38
							thoughts: 60
						

**Checking for Conditional Compilation in the Network Filter Code**

Okay, so I'm thinking I need to zero in on how these `init_subsystem` and `bpf_sock_destroy` functions are handled within the network filter code, specifically within `net/core/filter.c`. I'm going to start by confirming whether or not these calls are wrapped in any preprocessor directives, like `#ifdef` blocks. This is a common pattern for conditional compilation, and it's important to understand if different features or build configurations are affecting the behavior of these functions. So, let's start at line 12850 of `net/core/filter.c` and work my way through to the end of the file. I want to see if they're handled differently based on flags or settings.

{
  "File": "net/core/filter.c",
  "FirstLine": 12850,
  "LineCount": 100
}

{
  "Contents": "12850:\tstatic const struct btf_kfunc_id_set bpf_kfunc_set_xdp = {\n12851:\t\t.owner = THIS_MODULE,\n12852:\t\t.set = \u0026bpf_kfunc_check_set_xdp,\n12853:\t};\n12854:\t\n12855:\tstatic const struct btf_kfunc_id_set bpf_kfunc_set_sock_addr = {\n12856:\t\t.owner = THIS_MODULE,\n12857:\t\t.set = \u0026bpf_kfunc_check_set_sock_addr,\n12858:\t};\n12859:\t\n12860:\tstatic const struct btf_kfunc_id_set bpf_kfunc_set_tcp_reqsk = {\n12861:\t\t.owner = THIS_MODULE,\n12862:\t\t.set = \u0026bpf_kfunc_check_set_tcp_reqsk,\n12863:\t};\n12864:\t\n12865:\tstatic const struct btf_kfunc_id_set bpf_kfunc_set_sock_ops = {\n12866:\t\t.owner = THIS_MODULE,\n12867:\t\t.set = \u0026bpf_kfunc_check_set_sock_ops,\n12868:\t};\n12869:\t\n12870:\tstatic const struct btf_kfunc_id_set bpf_kfunc_set_icmp_send = {\n12871:\t\t.owner = THIS_MODULE,\n12872:\t\t.set = \u0026bpf_kfunc_check_set_icmp_send,\n12873:\t};\n12874:\t\n12875:\tstatic int __init bpf_kfunc_init(void)\n12876:\t{\n12877:\t\tint ret;\n12878:\t\n12879:\t\tret = register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, \u0026bpf_kfunc_set_skb);\n12880:\t\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_ACT, \u0026bpf_kfunc_set_skb);\n12881:\t\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SK_SKB, \u0026bpf_kfunc_set_skb);\n12882:\t\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SOCKET_FILTER, \u0026bpf_kfunc_set_skb);\n12883:\t\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_CGROUP_SKB, \u0026bpf_kfunc_set_skb);\n12884:\t\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_OUT, \u0026bpf_kfunc_set_skb);\n12885:\t\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_IN, \u0026bpf_kfunc_set_skb);\n12886:\t\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_XMIT, \u0026bpf_kfunc_set_skb);\n12887:\t\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_SEG6LOCAL, \u0026bpf_kfunc_set_skb);\n12888:\t\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_NETFILTER, \u0026bpf_kfunc_set_skb);\n12889:\t\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, \u0026bpf_kfunc_set_skb);\n12890:\t\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, \u0026bpf_kfunc_set_skb_meta);\n12891:\t\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_ACT, \u0026bpf_kfunc_set_skb_meta);\n12892:\t\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_XDP, \u0026bpf_kfunc_set_xdp);\n12893:\t\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_CGROUP_SOCK_ADDR,\n12894:\t\t\t\t\t\t       \u0026bpf_kfunc_set_sock_addr);\n12895:\t\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, \u0026bpf_kfunc_set_tcp_reqsk);\n12896:\t\tret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_CGROUP_SKB, \u0026bpf_kfunc_set_icmp_send);\n12897:\t\treturn ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SOCK_OPS, \u0026bpf_kfunc_set_sock_ops);\n12898:\t}\n12899:\tlate_initcall(bpf_kfunc_init);\n12900:\t\n12901:\t__bpf_kfunc_start_defs();\n12902:\t\n12903:\t/* bpf_sock_destroy: Destroy the given socket with ECONNABORTED error code.\n12904:\t *\n12905:\t * The function expects a non-NULL pointer to a socket, and invokes the\n12906:\t * protocol specific socket destroy handlers.\n12907:\t *\n12908:\t * The helper can only be called from BPF contexts that have acquired the socket\n12909:\t * locks.\n12910:\t *\n12911:\t * Parameters:\n12912:\t * @sock: Pointer to socket to be destroyed\n12913:\t *\n12914:\t * Return:\n12915:\t * On error, may return EOPNOTSUPP, or whatever the protocol specific\n12916:\t * destroy handler returns.\n12917:\t * EOPNOTSUPP if protocol specific destroy handler is not supported.\n12918:\t * 0 otherwise\n12919:\t */\n12920:\t__bpf_kfunc int bpf_sock_destroy(struct sock_common *sock)\n12921:\t{\n12922:\t\tstruct sock *sk = (struct sock *)sock;\n12923:\t\n12924:\t\t/* The locking semantics that allow for synchronous execution of the\n12925:\t\t * destroy handlers are only supported for TCP and UDP.\n12926:\t\t * Supporting protocols will need to acquire sock lock in the BPF context\n12927:\t\t * prior to invoking this kfunc.\n12928:\t\t */\n12929:\t\tif (!sk-\u003esk_prot-\u003ediag_destroy)\n12930:\t\t\treturn -EOPNOTSUPP;\n12931:\t\n12932:\t\tif (sk_fullsock(sk) \u0026\u0026\n12933:\t\t    sk-\u003esk_protocol != IPPROTO_TCP \u0026\u0026\n12934:\t\t    sk-\u003esk_protocol != IPPROTO_UDP)\n12935:\t\t\treturn -EOPNOTSUPP;\n12936:\t\n12937:\t\treturn sk-\u003esk_prot-\u003ediag_destroy(sk, ECONNABORTED);\n12938:\t}\n12939:\t\n12940:\t__bpf_kfunc_end_defs();\n12941:\t\n12942:\tBTF_KFUNCS_START(bpf_sk_iter_kfunc_ids)\n12943:\tBTF_ID_FLAGS(func, bpf_sock_destroy)\n12944:\tBTF_KFUNCS_END(bpf_sk_iter_kfunc_ids)\n12945:\t\n12946:\tstatic int tracing_iter_filter(const struct bpf_prog *prog, u32 kfunc_id)\n12947:\t{\n12948:\t\tif (btf_id_set8_contains(\u0026bpf_sk_iter_kfunc_ids, kfunc_id) \u0026\u0026\n12949:\t\t    prog-\u003eexpected_attach_type != BPF_TRACE_ITER)\n"
}

gemini-3.7-flash

null

null

							input: 25368
							output: 28
							thoughts: 55
						

**Examining the BPF Sock Destruction Mechanism**

Okay, so I need to quickly ascertain the build configuration for `bpf_sock_destroy`. It's crucial for understanding its availability in the kernel, particularly when dealing with networking and BPF syscalls. I'm going to double-check whether the entire `net/core/filter.c` file is gated behind some conditional or if `bpf_sock_destroy` is *always* built if `NET` and `BPF_SYSCALL` are both enabled. My instinct is to examine the `net/core/Makefile` for the most definitive answer. That should have the build rules, dependencies, and any relevant preprocessor directives that will illuminate the build configuration for that function. From there I'll be able to tell if it's always included or not.

{
  "Expression": "filter\\.o",
  "PathPrefix": "net/core/Makefile"
}

{
  "Output": "net/core/Makefile=12=obj-y\t\t     += dev.o dev_api.o dev_addr_lists.o dst.o netevent.o \\\nnet/core/Makefile:13:\t\t\tneighbour.o rtnetlink.o utils.o link_watch.o filter.o \\\nnet/core/Makefile-14-\t\t\tsock_diag.o dev_ioctl.o tso.o sock_reuseport.o \\\n"
}

gemini-3.7-flash

null

null

							input: 25740
							output: 21
							thoughts: 52
						

Okay, here's my thought process on this, distilled into a first-person summary as you requested, geared towards someone already familiar with the inner workings:

**Checking BPF and BTF Configuration**

Alright, so I need to verify how `BPF_SYSCALL` is defined and how it relates to `DEBUG_INFO_BTF`. My first instinct is to dive into the kernel configuration files. The logical places to look are `init/Kconfig` – that's where a lot of the initial features are declared – and `kernel/bpf/Kconfig`, since we're specifically talking about BPF. Let's start there. I'll need to confirm if these configurations are enabled independently and if the `DEBUG_INFO_BTF` is conditionally affected.

Then, to be efficient, instead of manually sifting through the file, I'll quickly use `grep` to search the codebase for both `BPF_SYSCALL` and `DEBUG_INFO_BTF`. That should give me the relevant lines in the configuration files, and also the broader codebase to see what depends on them, or what dependencies they have. This will hopefully provide the context I need to fully understand their relationship and ensure the desired configurations are set. This is the fastest way to get to the root of the problem.

{
  "Expression": "config BPF_SYSCALL"
}

{
  "Output": "kernel/bpf/Kconfig=25=menu \"BPF subsystem\"\nkernel/bpf/Kconfig-26-\nkernel/bpf/Kconfig:27:config BPF_SYSCALL\nkernel/bpf/Kconfig-28-\tbool \"Enable bpf() system call\"\n"
}

gemini-3.7-flash

null

null

							input: 26174
							output: 36
							thoughts: 53
						

**Investigating BTF and Kfuncs**

Okay, so I'm wondering about the interplay between `CONFIG_DEBUG_INFO_BTF` and kernel functions – are we truly reliant on BTF information for kfunc functionality? I need to get to the bottom of this. Let's start by digging into the definition of `register_btf_kfunc_id_set` to see how it's defined within `include/linux/btf.h`. Understanding that registration process will likely shed light on the dependency, or lack thereof, on the debug BTF data. Time to get my hands dirty and dive into the code!

{
  "File": "include/linux/btf.h",
  "FirstLine": 585,
  "LineCount": 40
}

{
  "Contents": " 585:\tint btf_kfunc_check_flag(const struct btf *btf, u32 kfunc_btf_id, u32 flag);\n 586:\tbool btf_kfunc_is_allowed(const struct btf *btf, u32 kfunc_btf_id, const struct bpf_prog *prog);\n 587:\tu32 *btf_kfunc_is_modify_return(const struct btf *btf, u32 kfunc_btf_id,\n 588:\t\t\t\t\tconst struct bpf_prog *prog);\n 589:\tint register_btf_kfunc_id_set(enum bpf_prog_type prog_type,\n 590:\t\t\t\t      const struct btf_kfunc_id_set *s);\n 591:\tint register_btf_fmodret_id_set(const struct btf_kfunc_id_set *kset);\n 592:\ts32 btf_find_dtor_kfunc(struct btf *btf, u32 btf_id);\n 593:\tint register_btf_id_dtor_kfuncs(const struct btf_id_dtor_kfunc *dtors, u32 add_cnt,\n 594:\t\t\t\t\tstruct module *owner);\n 595:\tstruct btf_struct_meta *btf_find_struct_meta(const struct btf *btf, u32 btf_id);\n 596:\tbool btf_is_projection_of(const char *pname, const char *tname);\n 597:\tbool btf_is_prog_ctx_type(struct bpf_verifier_log *log, const struct btf *btf,\n 598:\t\t\t\t   const struct btf_type *t, enum bpf_prog_type prog_type,\n 599:\t\t\t\t   int arg);\n 600:\tint get_kern_ctx_btf_id(struct bpf_verifier_log *log, enum bpf_prog_type prog_type);\n 601:\tbool btf_types_are_same(const struct btf *btf1, u32 id1,\n 602:\t\t\t\tconst struct btf *btf2, u32 id2);\n 603:\tint btf_check_iter_arg(struct btf *btf, const struct btf_type *func, int arg_idx);\n 604:\t\n 605:\tstatic inline bool btf_type_is_struct_ptr(struct btf *btf, const struct btf_type *t)\n 606:\t{\n 607:\t\tif (!btf_type_is_ptr(t))\n 608:\t\t\treturn false;\n 609:\t\n 610:\t\tt = btf_type_skip_modifiers(btf, t-\u003etype, NULL);\n 611:\t\n 612:\t\treturn btf_type_is_struct(t);\n 613:\t}\n 614:\t#else\n 615:\tstatic inline const struct btf_type *btf_type_by_id(const struct btf *btf,\n 616:\t\t\t\t\t\t\t    u32 type_id)\n 617:\t{\n 618:\t\treturn NULL;\n 619:\t}\n 620:\t\n 621:\tstatic inline void btf_set_base_btf(struct btf *btf, const struct btf *base_btf)\n 622:\t{\n 623:\t}\n 624:\t\n"
}

gemini-3.7-flash

null

null

							input: 27315
							output: 36
							thoughts: 24
						

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

**Diving into BTF in `include/linux/btf.h`**

Okay, I'm thinking I need to understand this BTF stuff better. Specifically, there's something interesting around line 585 in the `include/linux/btf.h` file. I'm going to quickly check what's defined in the `ifdef` block immediately *above* that line. I'm assuming it relates to a specific configuration, feature or platform. This is likely where the conditional compilation magic happens, and understanding that logic will give me some context before I dive into the implementation details of the code in the area of interest, which is likely dependent on that conditional logic. I anticipate that the `#ifdef` will likely condition inclusion of other relevant headers, declarations, or maybe even function definitions that I need for full comprehension of the code's behavior. Time to open the file and take a look.

{
  "File": "include/linux/btf.h",
  "FirstLine": 550,
  "LineCount": 40
}

{
  "Contents": " 550:\tenum btf_field_iter_kind {\n 551:\t\tBTF_FIELD_ITER_IDS,\n 552:\t\tBTF_FIELD_ITER_STRS,\n 553:\t};\n 554:\t\n 555:\tstruct btf_field_desc {\n 556:\t\t/* once-per-type offsets */\n 557:\t\tint t_off_cnt, t_offs[2];\n 558:\t\t/* member struct size, or zero, if no members */\n 559:\t\tint m_sz;\n 560:\t\t/* repeated per-member offsets */\n 561:\t\tint m_off_cnt, m_offs[1];\n 562:\t};\n 563:\t\n 564:\tstruct btf_field_iter {\n 565:\t\tstruct btf_field_desc desc;\n 566:\t\tvoid *p;\n 567:\t\tint m_idx;\n 568:\t\tint off_idx;\n 569:\t\tint vlen;\n 570:\t};\n 571:\t\n 572:\t#ifdef CONFIG_BPF_SYSCALL\n 573:\tconst struct btf_type *btf_type_by_id(const struct btf *btf, u32 type_id);\n 574:\tvoid btf_set_base_btf(struct btf *btf, const struct btf *base_btf);\n 575:\tint btf_relocate(struct btf *btf, const struct btf *base_btf, __u32 **map_ids);\n 576:\tint btf_field_iter_init(struct btf_field_iter *it, struct btf_type *t,\n 577:\t\t\t\tenum btf_field_iter_kind iter_kind);\n 578:\t__u32 *btf_field_iter_next(struct btf_field_iter *it);\n 579:\t\n 580:\tconst char *btf_name_by_offset(const struct btf *btf, u32 offset);\n 581:\tconst char *btf_str_by_offset(const struct btf *btf, u32 offset);\n 582:\tstruct btf *btf_parse_vmlinux(void);\n 583:\tstruct btf *bpf_prog_get_target_btf(const struct bpf_prog *prog);\n 584:\tu32 *btf_kfunc_flags(const struct btf *btf, u32 kfunc_btf_id, const struct bpf_prog *prog);\n 585:\tint btf_kfunc_check_flag(const struct btf *btf, u32 kfunc_btf_id, u32 flag);\n 586:\tbool btf_kfunc_is_allowed(const struct btf *btf, u32 kfunc_btf_id, const struct bpf_prog *prog);\n 587:\tu32 *btf_kfunc_is_modify_return(const struct btf *btf, u32 kfunc_btf_id,\n 588:\t\t\t\t\tconst struct bpf_prog *prog);\n 589:\tint register_btf_kfunc_id_set(enum bpf_prog_type prog_type,\n"
}

gemini-3.7-flash

null

null

							input: 28450
							output: 20
							thoughts: 80
						

Okay, here's my summary, tailored as requested:

**Navigating the BPF Configuration Landscape for Iterators**

Alright, let's get down to brass tacks. I'm focusing on enabling BPF iterators, particularly those touching on TCP. I know that `CONFIG_BPF_SYSCALL`, `CONFIG_NET`, and `CONFIG_DEBUG_INFO_BTF` are definitely in play – those are the foundation. Now, I need to make sure I haven't missed any other crucial configurations specific to `BPF_TRACE_ITER` or those related to the `iter/tcp` functionality. So, the next logical step is to dive into the codebase and search for anything related to `bpf_iter_tcp` or any other use of iterators in the BPF world. That should give me a more complete picture.

{
  "Expression": "bpf_iter_reg"
}

{
  "Output": "Documentation/bpf/bpf_iterators.rst=300=file.\n--\nDocumentation/bpf/bpf_iterators.rst-303-\nDocumentation/bpf/bpf_iterators.rst:304:  struct bpf_iter_reg {\nDocumentation/bpf/bpf_iterators.rst-305-            const char *target;\n--\nDocumentation/bpf/bpf_iterators.rst-316-\nDocumentation/bpf/bpf_iterators.rst:317:After filling the data structure fields, call ``bpf_iter_reg_target()`` to\nDocumentation/bpf/bpf_iterators.rst-318-register the iterator to the main BPF iterator subsystem.\nDocumentation/bpf/bpf_iterators.rst-319-\nDocumentation/bpf/bpf_iterators.rst:320:The following is the breakdown for each field in struct ``bpf_iter_reg``.\nDocumentation/bpf/bpf_iterators.rst-321-\n--\ninclude/linux/bpf.h=2980=enum bpf_iter_feature {\n--\ninclude/linux/bpf.h-2984-#define BPF_ITER_CTX_ARG_MAX 2\ninclude/linux/bpf.h:2985:struct bpf_iter_reg {\ninclude/linux/bpf.h-2986-\tconst char *target;\n--\ninclude/linux/bpf.h=3004=struct bpf_iter__bpf_map_elem {\n--\ninclude/linux/bpf.h-3010-\ninclude/linux/bpf.h:3011:int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);\ninclude/linux/bpf.h:3012:void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);\ninclude/linux/bpf.h-3013-int bpf_iter_prog_supported(struct bpf_prog *prog);\n--\nkernel/bpf/bpf_iter.c=10=struct bpf_iter_target_info {\nkernel/bpf/bpf_iter.c-11-\tstruct list_head list;\nkernel/bpf/bpf_iter.c:12:\tconst struct bpf_iter_reg *reg_info;\nkernel/bpf/bpf_iter.c-13-\tu32 btf_id;\t/* cached value */\n--\nkernel/bpf/bpf_iter.c=283=const struct file_operations bpf_iter_fops = {\n--\nkernel/bpf/bpf_iter.c-291- * a const static variable and passed as an argument to\nkernel/bpf/bpf_iter.c:292: * bpf_iter_reg_target().\nkernel/bpf/bpf_iter.c-293- */\nkernel/bpf/bpf_iter.c:294:int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info)\nkernel/bpf/bpf_iter.c-295-{\n--\nkernel/bpf/bpf_iter.c-311-\nkernel/bpf/bpf_iter.c:312:void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info)\nkernel/bpf/bpf_iter.c-313-{\n--\nkernel/bpf/bpf_iter.c=370=bpf_iter_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)\n--\nkernel/bpf/bpf_iter.c-377-\t\tif (tinfo-\u003ebtf_id == prog-\u003eaux-\u003eattach_btf_id) {\nkernel/bpf/bpf_iter.c:378:\t\t\tconst struct bpf_iter_reg *reg_info;\nkernel/bpf/bpf_iter.c-379-\n--\nkernel/bpf/cgroup_iter.c=284=DEFINE_BPF_ITER_FUNC(cgroup, struct bpf_iter_meta *meta,\n--\nkernel/bpf/cgroup_iter.c-286-\nkernel/bpf/cgroup_iter.c:287:static struct bpf_iter_reg bpf_cgroup_reg_info = {\nkernel/bpf/cgroup_iter.c-288-\t.target\t\t\t= \"cgroup\",\n--\nkernel/bpf/cgroup_iter.c=302=static int __init bpf_cgroup_iter_init(void)\n--\nkernel/bpf/cgroup_iter.c-304-\tbpf_cgroup_reg_info.ctx_arg_info[0].btf_id = bpf_cgroup_btf_id[0];\nkernel/bpf/cgroup_iter.c:305:\treturn bpf_iter_reg_target(\u0026bpf_cgroup_reg_info);\nkernel/bpf/cgroup_iter.c-306-}\n--\nkernel/bpf/dmabuf_iter.c=116=static const struct bpf_iter_seq_info dmabuf_iter_seq_info = {\n--\nkernel/bpf/dmabuf_iter.c-122-\nkernel/bpf/dmabuf_iter.c:123:static struct bpf_iter_reg bpf_dmabuf_reg_info = {\nkernel/bpf/dmabuf_iter.c-124-\t.target\t\t\t= \"dmabuf\",\n--\nkernel/bpf/dmabuf_iter.c=138=static int __init dmabuf_iter_init(void)\n--\nkernel/bpf/dmabuf_iter.c-140-\tbpf_dmabuf_reg_info.ctx_arg_info[0].btf_id = bpf_dmabuf_btf_id[0];\nkernel/bpf/dmabuf_iter.c:141:\treturn bpf_iter_reg_target(\u0026bpf_dmabuf_reg_info);\nkernel/bpf/dmabuf_iter.c-142-}\n--\nkernel/bpf/kmem_cache_iter.c=217=DEFINE_BPF_ITER_FUNC(kmem_cache, struct bpf_iter_meta *meta,\n--\nkernel/bpf/kmem_cache_iter.c-219-\nkernel/bpf/kmem_cache_iter.c:220:static struct bpf_iter_reg bpf_kmem_cache_reg_info = {\nkernel/bpf/kmem_cache_iter.c-221-\t.target\t\t\t= \"kmem_cache\",\n--\nkernel/bpf/kmem_cache_iter.c=232=static int __init bpf_kmem_cache_iter_init(void)\n--\nkernel/bpf/kmem_cache_iter.c-234-\tbpf_kmem_cache_reg_info.ctx_arg_info[0].btf_id = bpf_kmem_cache_btf_id[0];\nkernel/bpf/kmem_cache_iter.c:235:\treturn bpf_iter_reg_target(\u0026bpf_kmem_cache_reg_info);\nkernel/bpf/kmem_cache_iter.c-236-}\n--\nkernel/bpf/link_iter.c=83=static const struct bpf_iter_seq_info bpf_link_seq_info = {\n--\nkernel/bpf/link_iter.c-89-\nkernel/bpf/link_iter.c:90:static struct bpf_iter_reg bpf_link_reg_info = {\nkernel/bpf/link_iter.c-91-\t.target\t\t\t= \"bpf_link\",\n--\nkernel/bpf/link_iter.c=100=static int __init bpf_link_iter_init(void)\n--\nkernel/bpf/link_iter.c-102-\tbpf_link_reg_info.ctx_arg_info[0].btf_id = *btf_bpf_link_id;\nkernel/bpf/link_iter.c:103:\treturn bpf_iter_reg_target(\u0026bpf_link_reg_info);\nkernel/bpf/link_iter.c-104-}\n--\nkernel/bpf/map_iter.c=83=static const struct bpf_iter_seq_info bpf_map_seq_info = {\n--\nkernel/bpf/map_iter.c-89-\nkernel/bpf/map_iter.c:90:static struct bpf_iter_reg bpf_map_reg_info = {\nkernel/bpf/map_iter.c-91-\t.target\t\t\t= \"bpf_map\",\n--\nkernel/bpf/map_iter.c=169=DEFINE_BPF_ITER_FUNC(bpf_map_elem, struct bpf_iter_meta *meta,\n--\nkernel/bpf/map_iter.c-171-\nkernel/bpf/map_iter.c:172:static const struct bpf_iter_reg bpf_map_elem_reg_info = {\nkernel/bpf/map_iter.c-173-\t.target\t\t\t= \"bpf_map_elem\",\n--\nkernel/bpf/map_iter.c=187=static int __init bpf_map_iter_init(void)\n--\nkernel/bpf/map_iter.c-191-\tbpf_map_reg_info.ctx_arg_info[0].btf_id = *btf_bpf_map_id;\nkernel/bpf/map_iter.c:192:\tret = bpf_iter_reg_target(\u0026bpf_map_reg_info);\nkernel/bpf/map_iter.c-193-\tif (ret)\n--\nkernel/bpf/map_iter.c-195-\nkernel/bpf/map_iter.c:196:\treturn bpf_iter_reg_target(\u0026bpf_map_elem_reg_info);\nkernel/bpf/map_iter.c-197-}\n--\nkernel/bpf/prog_iter.c=83=static const struct bpf_iter_seq_info bpf_prog_seq_info = {\n--\nkernel/bpf/prog_iter.c-89-\nkernel/bpf/prog_iter.c:90:static struct bpf_iter_reg bpf_prog_reg_info = {\nkernel/bpf/prog_iter.c-91-\t.target\t\t\t= \"bpf_prog\",\n--\nkernel/bpf/prog_iter.c=100=static int __init bpf_prog_iter_init(void)\n--\nkernel/bpf/prog_iter.c-102-\tbpf_prog_reg_info.ctx_arg_info[0].btf_id = *btf_bpf_prog_id;\nkernel/bpf/prog_iter.c:103:\treturn bpf_iter_reg_target(\u0026bpf_prog_reg_info);\nkernel/bpf/prog_iter.c-104-}\n--\nkernel/bpf/task_iter.c=684=static void bpf_iter_task_show_fdinfo(const struct bpf_iter_aux_info *aux, struct seq_file *seq)\n--\nkernel/bpf/task_iter.c-692-\nkernel/bpf/task_iter.c:693:static struct bpf_iter_reg task_reg_info = {\nkernel/bpf/task_iter.c-694-\t.target\t\t\t= \"task\",\n--\nkernel/bpf/task_iter.c=707=static const struct bpf_iter_seq_info task_file_seq_info = {\n--\nkernel/bpf/task_iter.c-713-\nkernel/bpf/task_iter.c:714:static struct bpf_iter_reg task_file_reg_info = {\nkernel/bpf/task_iter.c-715-\t.target\t\t\t= \"task_file\",\n--\nkernel/bpf/task_iter.c=730=static const struct bpf_iter_seq_info task_vma_seq_info = {\n--\nkernel/bpf/task_iter.c-736-\nkernel/bpf/task_iter.c:737:static struct bpf_iter_reg task_vma_reg_info = {\nkernel/bpf/task_iter.c-738-\t.target\t\t\t= \"task_vma\",\n--\nkernel/bpf/task_iter.c=1202=static int __init task_iter_init(void)\n--\nkernel/bpf/task_iter.c-1212-\ttask_reg_info.ctx_arg_info[0].btf_id = btf_tracing_ids[BTF_TRACING_TYPE_TASK];\nkernel/bpf/task_iter.c:1213:\tret = bpf_iter_reg_target(\u0026task_reg_info);\nkernel/bpf/task_iter.c-1214-\tif (ret)\n--\nkernel/bpf/task_iter.c-1218-\ttask_file_reg_info.ctx_arg_info[1].btf_id = btf_tracing_ids[BTF_TRACING_TYPE_FILE];\nkernel/bpf/task_iter.c:1219:\tret =  bpf_iter_reg_target(\u0026task_file_reg_info);\nkernel/bpf/task_iter.c-1220-\tif (ret)\n--\nkernel/bpf/task_iter.c-1224-\ttask_vma_reg_info.ctx_arg_info[1].btf_id = btf_tracing_ids[BTF_TRACING_TYPE_VMA];\nkernel/bpf/task_iter.c:1225:\treturn bpf_iter_reg_target(\u0026task_vma_reg_info);\nkernel/bpf/task_iter.c-1226-}\n--\nkernel/kallsyms.c=854=static const struct bpf_iter_seq_info ksym_iter_seq_info = {\n--\nkernel/kallsyms.c-860-\nkernel/kallsyms.c:861:static struct bpf_iter_reg ksym_iter_reg_info = {\nkernel/kallsyms.c-862-\t.target                 = \"ksym\",\n--\nkernel/kallsyms.c=874=static int __init bpf_ksym_iter_register(void)\n--\nkernel/kallsyms.c-876-\tksym_iter_reg_info.ctx_arg_info[0].btf_id = *btf_ksym_iter_id;\nkernel/kallsyms.c:877:\treturn bpf_iter_reg_target(\u0026ksym_iter_reg_info);\nkernel/kallsyms.c-878-}\n--\nnet/core/bpf_sk_storage.c=891=static const struct bpf_iter_seq_info iter_seq_info = {\n--\nnet/core/bpf_sk_storage.c-897-\nnet/core/bpf_sk_storage.c:898:static struct bpf_iter_reg bpf_sk_storage_map_reg_info = {\nnet/core/bpf_sk_storage.c-899-\t.target\t\t\t= \"bpf_sk_storage_map\",\n--\nnet/core/bpf_sk_storage.c=914=static int __init bpf_sk_storage_map_iter_init(void)\n--\nnet/core/bpf_sk_storage.c-917-\t\tbtf_sock_ids[BTF_SOCK_TYPE_SOCK];\nnet/core/bpf_sk_storage.c:918:\treturn bpf_iter_reg_target(\u0026bpf_sk_storage_map_reg_info);\nnet/core/bpf_sk_storage.c-919-}\n--\nnet/core/sock_map.c=1966=static void sock_map_iter_detach_target(struct bpf_iter_aux_info *aux)\n--\nnet/core/sock_map.c-1970-\nnet/core/sock_map.c:1971:static struct bpf_iter_reg sock_map_iter_reg = {\nnet/core/sock_map.c-1972-\t.target\t\t\t= \"sockmap\",\n--\nnet/core/sock_map.c=1986=static int __init bpf_sockmap_iter_init(void)\n--\nnet/core/sock_map.c-1989-\t\tbtf_sock_ids[BTF_SOCK_TYPE_SOCK];\nnet/core/sock_map.c:1990:\treturn bpf_iter_reg_target(\u0026sock_map_iter_reg);\nnet/core/sock_map.c-1991-}\n--\nnet/ipv4/tcp_ipv4.c=3616=bpf_iter_tcp_get_func_proto(enum bpf_func_id func_id,\n--\nnet/ipv4/tcp_ipv4.c-3628-\nnet/ipv4/tcp_ipv4.c:3629:static struct bpf_iter_reg tcp_reg_info = {\nnet/ipv4/tcp_ipv4.c-3630-\t.target\t\t\t= \"tcp\",\n--\nnet/ipv4/tcp_ipv4.c-3639-\nnet/ipv4/tcp_ipv4.c:3640:static void __init bpf_iter_register(void)\nnet/ipv4/tcp_ipv4.c-3641-{\nnet/ipv4/tcp_ipv4.c-3642-\ttcp_reg_info.ctx_arg_info[0].btf_id = btf_sock_ids[BTF_SOCK_TYPE_SOCK_COMMON];\nnet/ipv4/tcp_ipv4.c:3643:\tif (bpf_iter_reg_target(\u0026tcp_reg_info))\nnet/ipv4/tcp_ipv4.c-3644-\t\tpr_warn(\"Warning: could not register bpf iterator tcp\\n\");\n--\nnet/ipv4/tcp_ipv4.c=3649=void __init tcp_v4_init(void)\n--\nnet/ipv4/tcp_ipv4.c-3674-#if defined(CONFIG_BPF_SYSCALL) \u0026\u0026 defined(CONFIG_PROC_FS)\nnet/ipv4/tcp_ipv4.c:3675:\tbpf_iter_register();\nnet/ipv4/tcp_ipv4.c-3676-#endif\n--\nnet/ipv4/udp.c=3882=static const struct bpf_iter_seq_info udp_seq_info = {\n--\nnet/ipv4/udp.c-3888-\nnet/ipv4/udp.c:3889:static struct bpf_iter_reg udp_reg_info = {\nnet/ipv4/udp.c-3890-\t.target\t\t\t= \"udp\",\n--\nnet/ipv4/udp.c-3898-\nnet/ipv4/udp.c:3899:static void __init bpf_iter_register(void)\nnet/ipv4/udp.c-3900-{\nnet/ipv4/udp.c-3901-\tudp_reg_info.ctx_arg_info[0].btf_id = btf_sock_ids[BTF_SOCK_TYPE_UDP];\nnet/ipv4/udp.c:3902:\tif (bpf_iter_reg_target(\u0026udp_reg_info))\nnet/ipv4/udp.c-3903-\t\tpr_warn(\"Warning: could not register bpf iterator udp\\n\");\n--\nnet/ipv4/udp.c=3907=void __init udp_init(void)\n--\nnet/ipv4/udp.c-3921-#if defined(CONFIG_BPF_SYSCALL) \u0026\u0026 defined(CONFIG_PROC_FS)\nnet/ipv4/udp.c:3922:\tbpf_iter_register();\nnet/ipv4/udp.c-3923-#endif\n--\nnet/ipv6/route.c=6892=static const struct bpf_iter_seq_info ipv6_route_seq_info = {\n--\nnet/ipv6/route.c-6898-\nnet/ipv6/route.c:6899:static struct bpf_iter_reg ipv6_route_reg_info = {\nnet/ipv6/route.c-6900-\t.target\t\t\t= \"ipv6_route\",\n--\nnet/ipv6/route.c-6908-\nnet/ipv6/route.c:6909:static int __init bpf_iter_register(void)\nnet/ipv6/route.c-6910-{\nnet/ipv6/route.c-6911-\tipv6_route_reg_info.ctx_arg_info[0].btf_id = *btf_fib6_info_id;\nnet/ipv6/route.c:6912:\treturn bpf_iter_reg_target(\u0026ipv6_route_reg_info);\nnet/ipv6/route.c-6913-}\n--\nnet/ipv6/route.c=6930=int __init ip6_route_init(void)\n--\nnet/ipv6/route.c-6980-#if defined(CONFIG_BPF_SYSCALL) \u0026\u0026 defined(CONFIG_PROC_FS)\nnet/ipv6/route.c:6981:\tret = bpf_iter_register();\nnet/ipv6/route.c-6982-\tif (ret)\n--\nnet/netlink/af_netlink.c=2895=static const struct bpf_iter_seq_info netlink_seq_info = {\n--\nnet/netlink/af_netlink.c-2901-\nnet/netlink/af_netlink.c:2902:static struct bpf_iter_reg netlink_reg_info = {\nnet/netlink/af_netlink.c-2903-\t.target\t\t\t= \"netlink\",\n--\nnet/netlink/af_netlink.c-2911-\nnet/netlink/af_netlink.c:2912:static int __init bpf_iter_register(void)\nnet/netlink/af_netlink.c-2913-{\nnet/netlink/af_netlink.c-2914-\tnetlink_reg_info.ctx_arg_info[0].btf_id = *btf_netlink_sock_id;\nnet/netlink/af_netlink.c:2915:\treturn bpf_iter_reg_target(\u0026netlink_reg_info);\nnet/netlink/af_netlink.c-2916-}\n--\nnet/netlink/af_netlink.c=2919=static int __init netlink_proto_init(void)\n--\nnet/netlink/af_netlink.c-2927-#if defined(CONFIG_BPF_SYSCALL) \u0026\u0026 defined(CONFIG_PROC_FS)\nnet/netlink/af_netlink.c:2928:\terr = bpf_iter_register();\nnet/netlink/af_netlink.c-2929-\tif (err)\n--\nnet/unix/af_unix.c=3908=bpf_iter_unix_get_func_proto(enum bpf_func_id func_id,\n--\nnet/unix/af_unix.c-3920-\nnet/unix/af_unix.c:3921:static struct bpf_iter_reg unix_reg_info = {\nnet/unix/af_unix.c-3922-\t.target\t\t\t= \"unix\",\n--\nnet/unix/af_unix.c-3931-\nnet/unix/af_unix.c:3932:static void __init bpf_iter_register(void)\nnet/unix/af_unix.c-3933-{\nnet/unix/af_unix.c-3934-\tunix_reg_info.ctx_arg_info[0].btf_id = btf_sock_ids[BTF_SOCK_TYPE_UNIX];\nnet/unix/af_unix.c:3935:\tif (bpf_iter_reg_target(\u0026unix_reg_info))\nnet/unix/af_unix.c-3936-\t\tpr_warn(\"Warning: could not register bpf iterator unix\\n\");\n--\nnet/unix/af_unix.c=3940=static int __init af_unix_init(void)\n--\nnet/unix/af_unix.c-3968-#if defined(CONFIG_BPF_SYSCALL) \u0026\u0026 defined(CONFIG_PROC_FS)\nnet/unix/af_unix.c:3969:\tbpf_iter_register();\nnet/unix/af_unix.c-3970-#endif\n"
}

gemini-3.7-flash

null

null

							input: 35055
							output: 165
							thoughts: 510
						

**Analysis of Patch for Fuzzing Prioritization**

Okay, let's break this down. We're looking at a patch that impacts the interaction of BPF with network sockets, specifically focusing on `BPF_SYSCALL`, `NET`, and `INET` functionalities. My initial check with `FocusSymbols` zeroed in on the key functions modified: `bpf_sock_destroy` and the related `tcp_abort`. The direct call to `tcp_abort` from `sk->sk_prot->diag_destroy` when `bpf_sock_destroy` is invoked for TCP connections, including those in the timewait/syn_recv states, is critical. We also have to consider `inet_twsk_deschedule_put` or `inet_csk_reqsk_queue_drop`, though `tcp_abort` is the primary target.

I've confirmed that `bpf_sock_destroy` is indeed a distinct, non-inlined kfunc within `vmlinux`, exported via BTF, so we can address it specifically. A review of the patch indicates that the change encompasses modifications to `net/core/filter.c` (specifically `bpf_sock_destroy`) and the selftests in the `tools/testing/selftests/...` directory.

Now, let's configure the fuzzing run. We're setting `WorthFuzzing` to `true` – absolutely. The *reasoning* is clear: this patch allows the destruction of non-fully established sockets, like TCP timewait or request sockets, through BPF iterators, achieved by checking `sk_fullsock()` before protocol verification. My `FocusSymbols` list is: `["bpf_sock_destroy", "tcp_abort"]`. The required `EnableConfigs` are: `["BPF_SYSCALL", "NET", "INET", "DEBUG_INFO_BTF"]`. Finally, I confirmed there are no `CONFIG_` prefixes. Everything looks solid. I am ready to call `set-results`.

{
  "EnableConfigs": [
    "BPF_SYSCALL",
    "NET",
    "INET",
    "DEBUG_INFO_BTF"
  ],
  "FocusSymbols": [
    "bpf_sock_destroy",
    "tcp_abort"
  ],
  "Reasoning": "The patch modifies the reachable BPF kfunc `bpf_sock_destroy` to support non-full sockets (such as TCP TIME_WAIT and request sockets) by only checking the protocol on full sockets (`sk_fullsock`). This allows BPF iterator programs to invoke socket destruction (`diag_destroy` / `tcp_abort`) on timewait sockets and syn-recv requests, which can uncover race conditions or state-handling issues during socket teardown.",
  "WorthFuzzing": true
}

{
  "EnableConfigs": [
    "BPF_SYSCALL",
    "NET",
    "INET",
    "DEBUG_INFO_BTF"
  ],
  "FocusSymbols": [
    "bpf_sock_destroy",
    "tcp_abort"
  ],
  "Reasoning": "The patch modifies the reachable BPF kfunc `bpf_sock_destroy` to support non-full sockets (such as TCP TIME_WAIT and request sockets) by only checking the protocol on full sockets (`sk_fullsock`). This allows BPF iterator programs to invoke socket destruction (`diag_destroy` / `tcp_abort`) on timewait sockets and syn-recv requests, which can uncover race conditions or state-handling issues during socket teardown.",
  "WorthFuzzing": true
}

{
  "WorthFuzzing": true
}

null

core

null

{
  "KMSANReasoning": "The patch modifies the BPF kfunc `bpf_sock_destroy()` in `net/core/filter.c` to support non-full sockets (such as TCP TIME_WAIT sockets) by checking `sk_fullsock(sk)` before inspecting `sk-\u003esk_protocol`, and invokes `sk-\u003esk_prot-\u003ediag_destroy(sk, ECONNABORTED)`. The accompanying changes are BPF selftests.\n\nKMSAN vs KASAN applicability:\n- KMSAN detects reads of uninitialized memory and kernel-to-user info leaks. This patch introduces no uninitialized memory allocations, no structure copying to userspace (via copy_to_user, netlink, ioctl, etc.), and no branching on uninitialized data.\n- The potential risks associated with socket destruction (e.g., socket lifecycle/refcounting races, locking issues, use-after-free or out-of-bounds dereferences) are covered by KASAN, LOCKDEP, and standard memory corruption detectors.\n- Therefore, 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 7ee487435d161e68e7d9fda717f3544400bced8b
Author: syz-cluster <triage@syzkaller.com>
Date:   Sat Sep 5 18:41:23 2026 +0000

    syz-cluster: applied patch under review

diff --git a/net/core/filter.c b/net/core/filter.c
index 61940e7535523..a41cc60a401a5 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -12912,8 +12912,9 @@ __bpf_kfunc_start_defs();
  * @sock: Pointer to socket to be destroyed
  *
  * Return:
- * On error, may return EPROTONOSUPPORT, EINVAL.
- * EPROTONOSUPPORT if protocol specific destroy handler is not supported.
+ * On error, may return EOPNOTSUPP, or whatever the protocol specific
+ * destroy handler returns.
+ * EOPNOTSUPP if protocol specific destroy handler is not supported.
  * 0 otherwise
  */
 __bpf_kfunc int bpf_sock_destroy(struct sock_common *sock)
@@ -12925,8 +12926,12 @@ __bpf_kfunc int bpf_sock_destroy(struct sock_common *sock)
 	 * Supporting protocols will need to acquire sock lock in the BPF context
 	 * prior to invoking this kfunc.
 	 */
-	if (!sk->sk_prot->diag_destroy || (sk->sk_protocol != IPPROTO_TCP &&
-					   sk->sk_protocol != IPPROTO_UDP))
+	if (!sk->sk_prot->diag_destroy)
+		return -EOPNOTSUPP;
+
+	if (sk_fullsock(sk) &&
+	    sk->sk_protocol != IPPROTO_TCP &&
+	    sk->sk_protocol != IPPROTO_UDP)
 		return -EOPNOTSUPP;
 
 	return sk->sk_prot->diag_destroy(sk, ECONNABORTED);
diff --git a/tools/testing/selftests/bpf/prog_tests/sock_destroy.c b/tools/testing/selftests/bpf/prog_tests/sock_destroy.c
index 9c11938fe597d..b90fab7073386 100644
--- a/tools/testing/selftests/bpf/prog_tests/sock_destroy.c
+++ b/tools/testing/selftests/bpf/prog_tests/sock_destroy.c
@@ -110,6 +110,74 @@ static void test_tcp_server(struct sock_destroy_prog *skel)
 		close(serv);
 }
 
+static void test_tcp_timewait(struct sock_destroy_prog *skel)
+{
+	int serv = -1, clien = -1, accept_serv = -1, n;
+	struct timeval tv = {};
+	char buf[1];
+
+	serv = start_server(AF_INET6, SOCK_STREAM, NULL, 0, 0);
+	if (!ASSERT_GE(serv, 0, "start_server"))
+		goto cleanup;
+
+	clien = connect_to_fd(serv, 0);
+	if (!ASSERT_GE(clien, 0, "connect_to_fd"))
+		goto cleanup;
+
+	accept_serv = accept(serv, NULL, NULL);
+	if (!ASSERT_GE(accept_serv, 0, "serv accept"))
+		goto cleanup;
+
+	/*
+	 * Active close from the client, then close the server side. Once
+	 * recv() sees EOF the server FIN has been processed and the client
+	 * sock is in TIME_WAIT. Block without timeout so a loaded CI box
+	 * can't race us.
+	 */
+	if (!ASSERT_OK(setsockopt(clien, SOL_SOCKET, SO_RCVTIMEO, &tv,
+				  sizeof(tv)), "clear rcvtimeo"))
+		goto cleanup;
+	if (!ASSERT_OK(shutdown(clien, SHUT_WR), "client shutdown"))
+		goto cleanup;
+
+	/*
+	 * Make sure the server has seen the client FIN before it closes,
+	 * so the two FINs never cross.
+	 */
+	n = recv(accept_serv, buf, sizeof(buf), 0);
+	if (!ASSERT_EQ(n, 0, "server recv EOF"))
+		goto cleanup;
+
+	close(accept_serv);
+	accept_serv = -1;
+
+	/* block until return EOF */
+	n = recv(clien, buf, sizeof(buf), 0);
+	if (!ASSERT_EQ(n, 0, "client recv EOF"))
+		goto cleanup;
+
+	/* Run iterator program that destroys the timewait client sock. */
+	skel->bss->tw_found = 0;
+	start_iter_sockets(skel->progs.iter_tcp6_timewait);
+	if (!ASSERT_EQ(skel->bss->tw_found, 1, "timewait sock found"))
+		goto cleanup;
+
+	ASSERT_OK(skel->bss->tw_destroy_err, "destroy timewait sock");
+
+	/* The destroyed timewait sock must be gone. */
+	skel->bss->tw_found = 0;
+	start_iter_sockets(skel->progs.iter_tcp6_timewait);
+	ASSERT_EQ(skel->bss->tw_found, 0, "timewait sock destroyed");
+
+cleanup:
+	if (clien != -1)
+		close(clien);
+	if (accept_serv != -1)
+		close(accept_serv);
+	if (serv != -1)
+		close(serv);
+}
+
 static void test_udp_client(struct sock_destroy_prog *skel)
 {
 	int serv = -1, clien = -1, n = 0;
@@ -204,11 +272,12 @@ void test_sock_destroy(void)
 		test_tcp_client(skel);
 	if (test__start_subtest("tcp_server"))
 		test_tcp_server(skel);
+	if (test__start_subtest("tcp_timewait"))
+		test_tcp_timewait(skel);
 	if (test__start_subtest("udp_client"))
 		test_udp_client(skel);
 	if (test__start_subtest("udp_server"))
 		test_udp_server(skel);
-
 	RUN_TESTS(sock_destroy_prog_fail);
 
 cleanup:
diff --git a/tools/testing/selftests/bpf/progs/sock_destroy_prog.c b/tools/testing/selftests/bpf/progs/sock_destroy_prog.c
index 9e0bf7a54cec9..0a8887543218a 100644
--- a/tools/testing/selftests/bpf/progs/sock_destroy_prog.c
+++ b/tools/testing/selftests/bpf/progs/sock_destroy_prog.c
@@ -7,6 +7,8 @@
 #include "bpf_tracing_net.h"
 
 __be16 serv_port = 0;
+int tw_found = 0;
+int tw_destroy_err = 0;
 
 int bpf_sock_destroy(struct sock_common *sk) __ksym;
 
@@ -100,6 +102,34 @@ int iter_tcp6_server(struct bpf_iter__tcp *ctx)
 	return 0;
 }
 
+SEC("iter/tcp")
+int iter_tcp6_timewait(struct bpf_iter__tcp *ctx)
+{
+	struct sock_common *sk_common = ctx->sk_common;
+	__u64 *val;
+	int key = 0;
+
+	if (!sk_common)
+		return 0;
+
+	if (sk_common->skc_family != AF_INET6)
+		return 0;
+
+	if (!bpf_skc_to_tcp_timewait_sock(sk_common))
+		return 0;
+
+	val = bpf_map_lookup_elem(&tcp_conn_sockets, &key);
+	if (!val)
+		return 0;
+	/* The timewait sock inherits the cookie of the closed client sock. */
+	if (bpf_get_socket_cookie(sk_common) != *val)
+		return 0;
+
+	tw_found++;
+	tw_destroy_err = bpf_sock_destroy(sk_common);
+
+	return 0;
+}
 
 SEC("iter/udp")
 int iter_udp6_client(struct bpf_iter__udp *ctx)

gemini-3.7-flash

null

null

							input: 4079
							output: 19
							thoughts: 379
						

**KMSAN Fuzzing Session Analysis**

Okay, so I need to decide if this kernel patch in `net/core/filter.c` warrants a dedicated KMSAN fuzzing session. Let's dig in. I see they've modified the `bpf_sock_destroy` function. The code's been simplified a bit, but there's a new check using `sk_fullsock(sk)`.

My initial thought is to figure out the implications of this change. I need to understand what `sk_fullsock` actually *does* and, importantly, the contexts in which `bpf_sock_destroy` is called and how the new check interacts with different socket types. I'm thinking specifically about TCP and UDP, as the comment mentions protocol-specific locking semantics. The removed condition and added condition could change behavior for some protocols.

I'm going to quickly search for the definition of `bpf_sock_destroy`, `sk_fullsock`, and `diag_destroy` using `grepper`. I'll be looking for any hints on how these functions behave in the presence of TCP timewait sockets, or any other kind of "non-fullsock" scenarios. I need to see if this change might introduce any new memory safety issues, especially with those delicate, often transient, states. Understanding this should allow me to make an informed decision as to whether a specialized fuzzing campaign is needed.

no matches

{
  "Expression": "define sk_fullsock"
}

{
  "error": "no matches"
}

gemini-3.7-flash

null

null

							input: 4792
							output: 31
							thoughts: 21
						

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

**Investigating `sk_fullsock` in `include/net/sock.h`**

Okay, so I need to understand how `sk_fullsock` is being used. My first step is to dive right into the definition, which likely lives in `include/net/sock.h`. I'm hoping it's a relatively straightforward structure or macro, and the header file should give me the authoritative definition. This is the starting point for understanding its role within the broader networking context. I'll be looking for clues about its relationship to the `sock` structure itself, any associated flags or states, and how it relates to connection establishment, data flow, and socket lifecycle in general. It will also be useful to see how this particular variable, `sk_fullsock` has been used, so I am going to need to do some code searches based on this information. Let's start digging!

{
  "Expression": "sk_fullsock",
  "PathPrefix": "include/net/sock.h"
}

{
  "Output": "include/net/sock.h=3016=skb_sk_is_prefetched(struct sk_buff *skb)\n--\ninclude/net/sock.h-3027- */\ninclude/net/sock.h:3028:static inline bool sk_fullsock(const struct sock *sk)\ninclude/net/sock.h-3029-{\n--\ninclude/net/sock.h=3034=sk_is_refcounted(struct sock *sk)\n--\ninclude/net/sock.h-3036-\t/* Only full sockets have sk-\u003esk_flags. */\ninclude/net/sock.h:3037:\treturn !sk_fullsock(sk) || !sock_flag(sk, SOCK_RCU_FREE);\ninclude/net/sock.h-3038-}\n--\ninclude/net/sock.h=3041=sk_requests_wifi_status(struct sock *sk)\ninclude/net/sock.h-3042-{\ninclude/net/sock.h:3043:\treturn sk \u0026\u0026 sk_fullsock(sk) \u0026\u0026 sock_flag(sk, SOCK_WIFI_STATUS);\ninclude/net/sock.h-3044-}\n--\ninclude/net/sock.h=3116=static inline void sk_pacing_shift_update(struct sock *sk, int val)\ninclude/net/sock.h-3117-{\ninclude/net/sock.h:3118:\tif (!sk || !sk_fullsock(sk) || READ_ONCE(sk-\u003esk_pacing_shift) == val)\ninclude/net/sock.h-3119-\t\treturn;\n"
}

gemini-3.7-flash

null

null

							input: 5472
							output: 36
							thoughts: 21
						

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

**Diving into `sock.h`**

Okay, time to get my hands dirty. I need to understand this specific network socket behavior. Let's pull up the source code, specifically `include/net/sock.h`. I'm going to start around line 3028. Hopefully, that's where the relevant definitions are. I'll be looking for clues about the implementation details. I need to understand it at a granular level. Let's get to it.

{
  "File": "include/net/sock.h",
  "FirstLine": 3020,
  "LineCount": 20
}

{
  "Contents": "3020:\t#else\n3021:\t\treturn false;\n3022:\t#endif /* CONFIG_INET */\n3023:\t}\n3024:\t\n3025:\t/* This helper checks if a socket is a full socket,\n3026:\t * ie _not_ a timewait or request socket.\n3027:\t */\n3028:\tstatic inline bool sk_fullsock(const struct sock *sk)\n3029:\t{\n3030:\t\treturn (1 \u003c\u003c sk-\u003esk_state) \u0026 ~(TCPF_TIME_WAIT | TCPF_NEW_SYN_RECV);\n3031:\t}\n3032:\t\n3033:\tstatic inline bool\n3034:\tsk_is_refcounted(struct sock *sk)\n3035:\t{\n3036:\t\t/* Only full sockets have sk-\u003esk_flags. */\n3037:\t\treturn !sk_fullsock(sk) || !sock_flag(sk, SOCK_RCU_FREE);\n3038:\t}\n3039:\t\n"
}

gemini-3.7-flash

null

null

							input: 5937
							output: 25
							thoughts: 111
						

**Delving into Socket Structures and Destruction Mechanisms**

Okay, so I need to understand why this `bpf_sock_destroy` function was checking `sk->sk_protocol`, even though it seems like that field might not always be reliable or even valid in sockets that are in the `TIME_WAIT` or `REQUEST` states. My initial thought is to dive into the structures themselves, particularly `struct sock_common`, `struct inet_timewait_sock`, and `struct tcp_timewait_sock`. Seeing how these are defined and how they relate to the underlying socket (`sk`) will likely shed light on the issue. I need to understand the lifecycle of these sockets and where `sk->sk_protocol` fits in.

Following that, I need to figure out the path the socket takes to be destroyed. Therefore, I will search for the function `diag_destroy` across the `net/` directory and functions such as `tcp_twsk_diag_destroy` or `tcp_diag_destroy` to get a sense of the destruction process. Hopefully, this will tell me what the destruction routines depend on. It should show if the protocol is needed or not. I'm hoping to pinpoint the exact moment or context where the protocol might become unavailable or undefined, and thus, why that check in `bpf_sock_destroy` might have caused problems. This should give me a solid grasp of whether the check was necessary, and how we could handle the socket's states more robustly.

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

{
  "Output": "net/core/filter.c=12920=__bpf_kfunc int bpf_sock_destroy(struct sock_common *sock)\n--\nnet/core/filter.c-12928-\t */\nnet/core/filter.c:12929:\tif (!sk-\u003esk_prot-\u003ediag_destroy)\nnet/core/filter.c-12930-\t\treturn -EOPNOTSUPP;\n--\nnet/core/filter.c-12936-\nnet/core/filter.c:12937:\treturn sk-\u003esk_prot-\u003ediag_destroy(sk, ECONNABORTED);\nnet/core/filter.c-12938-}\n--\nnet/core/sock_diag.c=143=static void sock_diag_broadcast_destroy_work(struct work_struct *work)\n--\nnet/core/sock_diag.c-149-\tstruct sk_buff *skb;\nnet/core/sock_diag.c:150:\tconst enum sknetlink_groups group = sock_diag_destroy_group(sk);\nnet/core/sock_diag.c-151-\tint err = -1;\n--\nnet/core/sock_diag.c=295=static int sock_diag_bind(struct net *net, int group)\n--\nnet/core/sock_diag.c-311-\nnet/core/sock_diag.c:312:int sock_diag_destroy(struct sock *sk, int err)\nnet/core/sock_diag.c-313-{\n--\nnet/core/sock_diag.c-316-\nnet/core/sock_diag.c:317:\tif (!sk-\u003esk_prot-\u003ediag_destroy)\nnet/core/sock_diag.c-318-\t\treturn -EOPNOTSUPP;\nnet/core/sock_diag.c-319-\nnet/core/sock_diag.c:320:\treturn sk-\u003esk_prot-\u003ediag_destroy(sk, err);\nnet/core/sock_diag.c-321-}\nnet/core/sock_diag.c:322:EXPORT_SYMBOL_GPL(sock_diag_destroy);\nnet/core/sock_diag.c-323-\n--\nnet/ipv4/raw.c=948=struct proto raw_prot = {\n--\nnet/ipv4/raw.c-972-#endif\nnet/ipv4/raw.c:973:\t.diag_destroy\t   = raw_abort,\nnet/ipv4/raw.c-974-};\n--\nnet/ipv4/raw_diag.c=187=static void raw_diag_get_info(struct sock *sk, struct inet_diag_msg *r,\n--\nnet/ipv4/raw_diag.c-194-#ifdef CONFIG_INET_DIAG_DESTROY\nnet/ipv4/raw_diag.c:195:static int raw_diag_destroy(struct sk_buff *in_skb,\nnet/ipv4/raw_diag.c-196-\t\t\t    const struct inet_diag_req_v2 *r)\n--\nnet/ipv4/raw_diag.c-204-\t\treturn PTR_ERR(sk);\nnet/ipv4/raw_diag.c:205:\terr = sock_diag_destroy(sk, ECONNABORTED);\nnet/ipv4/raw_diag.c-206-\tsock_put(sk);\n--\nnet/ipv4/raw_diag.c=211=static const struct inet_diag_handler raw_diag_handler = {\n--\nnet/ipv4/raw_diag.c-218-#ifdef CONFIG_INET_DIAG_DESTROY\nnet/ipv4/raw_diag.c:219:\t.destroy\t\t= raw_diag_destroy,\nnet/ipv4/raw_diag.c-220-#endif\n--\nnet/ipv4/tcp_diag.c=604=static int tcp_diag_dump_one(struct netlink_callback *cb,\n--\nnet/ipv4/tcp_diag.c-641-#ifdef CONFIG_INET_DIAG_DESTROY\nnet/ipv4/tcp_diag.c:642:static int tcp_diag_destroy(struct sk_buff *in_skb,\nnet/ipv4/tcp_diag.c-643-\t\t\t    const struct inet_diag_req_v2 *req)\n--\nnet/ipv4/tcp_diag.c-652-\nnet/ipv4/tcp_diag.c:653:\terr = sock_diag_destroy(sk, ECONNABORTED);\nnet/ipv4/tcp_diag.c-654-\n--\nnet/ipv4/tcp_diag.c=661=static const struct inet_diag_handler tcp_diag_handler = {\n--\nnet/ipv4/tcp_diag.c-669-#ifdef CONFIG_INET_DIAG_DESTROY\nnet/ipv4/tcp_diag.c:670:\t.destroy\t\t= tcp_diag_destroy,\nnet/ipv4/tcp_diag.c-671-#endif\n--\nnet/ipv4/tcp_ipv4.c=3347=struct proto tcp_prot = {\n--\nnet/ipv4/tcp_ipv4.c-3395-\t.no_autobind\t\t= true,\nnet/ipv4/tcp_ipv4.c:3396:\t.diag_destroy\t\t= tcp_abort,\nnet/ipv4/tcp_ipv4.c-3397-};\n--\nnet/ipv4/udp.c=3143=struct proto udp_prot = {\n--\nnet/ipv4/udp.c-3173-\t.obj_size\t\t= sizeof(struct udp_sock),\nnet/ipv4/udp.c:3174:\t.diag_destroy\t\t= udp_abort,\nnet/ipv4/udp.c-3175-};\n--\nnet/ipv4/udp_diag.c=144=static void udp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,\n--\nnet/ipv4/udp_diag.c-151-#ifdef CONFIG_INET_DIAG_DESTROY\nnet/ipv4/udp_diag.c:152:static int udp_diag_destroy(struct sk_buff *in_skb,\nnet/ipv4/udp_diag.c-153-\t\t\t    const struct inet_diag_req_v2 *req)\n--\nnet/ipv4/udp_diag.c-200-\nnet/ipv4/udp_diag.c:201:\terr = sock_diag_destroy(sk, ECONNABORTED);\nnet/ipv4/udp_diag.c-202-\n--\nnet/ipv4/udp_diag.c=209=static const struct inet_diag_handler udp_diag_handler = {\n--\nnet/ipv4/udp_diag.c-216-#ifdef CONFIG_INET_DIAG_DESTROY\nnet/ipv4/udp_diag.c:217:\t.destroy\t = udp_diag_destroy,\nnet/ipv4/udp_diag.c-218-#endif\n--\nnet/ipv6/raw.c=1207=struct proto rawv6_prot = {\n--\nnet/ipv6/raw.c-1231-#endif\nnet/ipv6/raw.c:1232:\t.diag_destroy\t   = raw_abort,\nnet/ipv6/raw.c-1233-};\n--\nnet/ipv6/tcp_ipv6.c=2276=struct proto tcpv6_prot = {\n--\nnet/ipv6/tcp_ipv6.c-2325-\t.no_autobind\t\t= true,\nnet/ipv6/tcp_ipv6.c:2326:\t.diag_destroy\t\t= tcp_abort,\nnet/ipv6/tcp_ipv6.c-2327-};\n--\nnet/ipv6/udp.c=1908=struct proto udpv6_prot = {\n--\nnet/ipv6/udp.c-1940-\t.ipv6_pinfo_offset = offsetof(struct udp6_sock, inet6),\nnet/ipv6/udp.c:1941:\t.diag_destroy\t\t= udp_abort,\nnet/ipv6/udp.c-1942-};\n--\nnet/mptcp/subflow.c=2146=void __init mptcp_subflow_init(void)\n--\nnet/mptcp/subflow.c-2166-\ttcp_prot_override.release_cb = tcp_release_cb_override;\nnet/mptcp/subflow.c:2167:\ttcp_prot_override.diag_destroy = tcp_abort_override;\nnet/mptcp/subflow.c-2168-#ifdef CONFIG_BPF_SYSCALL\n--\nnet/mptcp/subflow.c=2180=void __init mptcp_subflow_v6_init(void)\n--\nnet/mptcp/subflow.c-2213-\ttcpv6_prot_override.release_cb = tcp_release_cb_override;\nnet/mptcp/subflow.c:2214:\ttcpv6_prot_override.diag_destroy = tcp_abort_override;\nnet/mptcp/subflow.c-2215-#ifdef CONFIG_BPF_SYSCALL\n"
}

gemini-3.7-flash

null

null

							input: 8737
							output: 32
							thoughts: 38
						

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

**Diving into the Socket Structures**

Okay, so I'm thinking about socket data structures again, and the specific relationships between them are, as always, the key. Let's get down to brass tacks: `struct sock_common`, `struct sock`, and `struct inet_timewait_sock`. My mind immediately starts to pull up the memory maps and likely the inheritance relationships between them. Where does each one come in to play? What core features are each responsible for?

I need to quickly establish the foundation, so the logical starting point is `struct sock_common`. I'll want to review the basic elements that are common across socket types. Let's see what's really happening at the low level. Gotta refresh the memory of what's fundamental here.

{
  "Expression": "struct sock_common \\{",
  "PathPrefix": "include/net/sock.h"
}

{
  "Output": "include/net/sock.h=108=typedef __u64 __bitwise __addrpair;\n--\ninclude/net/sock.h-155- */\ninclude/net/sock.h:156:struct sock_common {\ninclude/net/sock.h-157-\tunion {\n"
}

gemini-3.7-flash

null

null

							input: 9076
							output: 35
							thoughts: 20
						

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

**Diving into `struct sock_common`**

Okay, time to get my hands dirty. Let's dig into the heart of the matter – I need to really understand the fundamental data structure that underpins socket operations in the Linux kernel. Specifically, I'm focusing on `struct sock_common` within `include/net/sock.h`. I've probably looked at this a thousand times, but every time I review it I find something new or a better understanding of how it fits into the whole. I’m especially interested in how this structure ties into the various socket states and lifecycle events. Hopefully, it's all in the header, or the related source files. I'm hoping to get a clearer picture of how socket queuing is managed in relation to RX/TX paths, locking mechanisms, and the impact of various socket options and flags. I'm anticipating finding pointers to queues, flags indicating state (like `TCP_ESTABLISHED` or `SOCK_DEAD`), and possibly fields related to memory management and resource allocation. It's time to refresh my memory and check for any nuances or changes since my last deep dive.

{
  "File": "include/net/sock.h",
  "FirstLine": 156,
  "LineCount": 80
}

{
  "Contents": " 156:\tstruct sock_common {\n 157:\t\tunion {\n 158:\t\t\t__addrpair\tskc_addrpair;\n 159:\t\t\tstruct {\n 160:\t\t\t\t__be32\tskc_daddr;\n 161:\t\t\t\t__be32\tskc_rcv_saddr;\n 162:\t\t\t};\n 163:\t\t};\n 164:\t\tunion  {\n 165:\t\t\tunsigned int\tskc_hash;\n 166:\t\t\t__u16\t\tskc_u16hashes[2];\n 167:\t\t};\n 168:\t\t/* skc_dport \u0026\u0026 skc_num must be grouped as well */\n 169:\t\tunion {\n 170:\t\t\t__portpair\tskc_portpair;\n 171:\t\t\tstruct {\n 172:\t\t\t\t__be16\tskc_dport;\n 173:\t\t\t\t__u16\tskc_num;\n 174:\t\t\t};\n 175:\t\t};\n 176:\t\n 177:\t\tunsigned short\t\tskc_family;\n 178:\t\tvolatile unsigned char\tskc_state;\n 179:\t\tunsigned char\t\tskc_reuse:4;\n 180:\t\tunsigned char\t\tskc_reuseport:1;\n 181:\t\tunsigned char\t\tskc_ipv6only:1;\n 182:\t\tunsigned char\t\tskc_net_refcnt:1;\n 183:\t\tunsigned char\t\tskc_bypass_prot_mem:1;\n 184:\t\tint\t\t\tskc_bound_dev_if;\n 185:\t\tunion {\n 186:\t\t\tstruct hlist_node\tskc_bind_node;\n 187:\t\t\tstruct hlist_node\tskc_portaddr_node;\n 188:\t\t};\n 189:\t\tstruct proto\t\t*skc_prot;\n 190:\t\tpossible_net_t\t\tskc_net;\n 191:\t\n 192:\t#if IS_ENABLED(CONFIG_IPV6)\n 193:\t\tstruct in6_addr\t\tskc_v6_daddr;\n 194:\t\tstruct in6_addr\t\tskc_v6_rcv_saddr;\n 195:\t#endif\n 196:\t\n 197:\t\tatomic64_t\t\tskc_cookie;\n 198:\t\n 199:\t\t/* following fields are padding to force\n 200:\t\t * offset(struct sock, sk_refcnt) == 128 on 64bit arches\n 201:\t\t * assuming IPV6 is enabled. We use this padding differently\n 202:\t\t * for different kind of 'sockets'\n 203:\t\t */\n 204:\t\tunion {\n 205:\t\t\tunsigned long\tskc_flags;\n 206:\t\t\tstruct sock\t*skc_listener; /* request_sock */\n 207:\t\t\tstruct inet_timewait_death_row *skc_tw_dr; /* inet_timewait_sock */\n 208:\t\t};\n 209:\t\t/*\n 210:\t\t * fields between dontcopy_begin/dontcopy_end\n 211:\t\t * are not copied in sock_copy()\n 212:\t\t */\n 213:\t\t/* private: */\n 214:\t\tint\t\t\tskc_dontcopy_begin[0];\n 215:\t\t/* public: */\n 216:\t\tunion {\n 217:\t\t\tstruct hlist_node\tskc_node;\n 218:\t\t\tstruct hlist_nulls_node skc_nulls_node;\n 219:\t\t};\n 220:\t\tunsigned short\t\tskc_tx_queue_mapping;\n 221:\t#ifdef CONFIG_SOCK_RX_QUEUE_MAPPING\n 222:\t\tunsigned short\t\tskc_rx_queue_mapping;\n 223:\t#endif\n 224:\t\tunion {\n 225:\t\t\tint\t\tskc_incoming_cpu;\n 226:\t\t\tu32\t\tskc_rcv_wnd;\n 227:\t\t\tu32\t\tskc_tw_rcv_nxt; /* struct tcp_timewait_sock  */\n 228:\t\t};\n 229:\t\n 230:\t\trefcount_t\t\tskc_refcnt;\n 231:\t\t/* private: */\n 232:\t\tint                     skc_dontcopy_end[0];\n 233:\t\tunion {\n 234:\t\t\tu32\t\tskc_rxhash;\n 235:\t\t\tu32\t\tskc_window_clamp;\n"
}

gemini-3.7-flash

null

null

							input: 10593
							output: 30
							thoughts: 43
						

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

**Diving into the Kernel's Network Socket Structure**

Okay, time to dissect `struct sock`. Let's see... I seem to recall that somewhere in here, `sk_protocol` is defined. I think it's part of the common socket data, maybe defined using a preprocessor directive, something along the lines of `#define sk_protocol __sk_common.skc_protocol`... or was it a slightly different naming convention? Either way, I need to confirm where `sk_protocol` actually lives within this structure. That's the key: understanding the relationship between the members. Time to trace where exactly it's declared and how it is used. I'll need to figure out where it's located to continue.

{
  "Expression": "sk_protocol",
  "PathPrefix": "include/net/sock.h"
}

{
  "Output": "include/net/sock.h=242=struct sk_filter;\n--\ninclude/net/sock.h-301-  *\t@sk_type: socket type (%SOCK_STREAM, etc)\ninclude/net/sock.h:302:  *\t@sk_protocol: which protocol this socket belongs in this network family\ninclude/net/sock.h-303-  *\t@sk_peer_lock: lock protecting @sk_peer_pid and @sk_peer_cred\n--\ninclude/net/sock.h=365=struct sock {\n--\ninclude/net/sock.h-511-\tkuid_t\t\t\tsk_uid;\ninclude/net/sock.h:512:\tu16\t\t\tsk_protocol;\ninclude/net/sock.h-513-\tu16\t\t\tsk_type;\n--\ninclude/net/sock.h=2965=static inline bool sk_is_tcp(const struct sock *sk)\n--\ninclude/net/sock.h-2968-\t       sk-\u003esk_type == SOCK_STREAM \u0026\u0026\ninclude/net/sock.h:2969:\t       sk-\u003esk_protocol == IPPROTO_TCP;\ninclude/net/sock.h-2970-}\n--\ninclude/net/sock.h=2972=static inline bool sk_is_udp(const struct sock *sk)\n--\ninclude/net/sock.h-2975-\t       sk-\u003esk_type == SOCK_DGRAM \u0026\u0026\ninclude/net/sock.h:2976:\t       sk-\u003esk_protocol == IPPROTO_UDP;\ninclude/net/sock.h-2977-}\n"
}

gemini-3.7-flash

null

null

							input: 11258
							output: 25
							thoughts: 610
						

**My Analysis of the `bpf_sock_destroy` Vulnerability**

Okay, here's what I'm thinking... The `sk_protocol` field is located within the `struct sock` structure, and it appears *after* the `struct sock_common` portion of that structure. But, importantly, `struct inet_timewait_sock` *doesn't* contain a full `struct sock`! It only contains a `struct sock_common`. Right, so if `bpf_sock_destroy` gets handed a `struct sock_common *sock`, which, in some cases, could actually be a `struct inet_timewait_sock *` coming from a BPF iterator, and then it casts that to a `struct sock *`... that's a problem.

Basically, *before*, when the code tried to read `sk->sk_protocol` in the `bpf_sock_destroy` function, it was effectively reading memory *beyond* the bounds of the `inet_timewait_sock` structure. If the `inet_timewait_sock` structure is smaller than `struct sock`, we were reading garbage!

Let's quickly check the sizes... Yeah, `struct sock` is definitely *much* larger than `struct inet_timewait_sock`.  Got it.

Alright, what about that `sk_fullsock(sk)` call? That checks the `sk->sk_state`. Okay, but where is `sk_state`? Ah, it's inside `struct sock_common` as `skc_state`. Perfect. So we do not have an issue with `sk_fullsock`.

Now let's look at the actual code change in `net/core/filter.c` for `bpf_sock_destroy`:

```c
__bpf_kfunc int bpf_sock_destroy(struct sock_common *sock)
{
	struct sock *sk = (struct sock *)sock;

	/* The locking semantics that allow for concurrent sock destroy are
	 * specific to each protocol, so only allow the supported protocols.
	 * Supporting protocols will need to acquire sock lock in the BPF context
	 * prior to invoking this kfunc.
	 */
	if (!sk->sk_prot->diag_destroy)
		return -EOPNOTSUPP;

	if (sk_fullsock(sk) &&
	    sk->sk_protocol != IPPROTO_TCP &&
	    sk->sk_protocol != IPPROTO_UDP)
		return -EOPNOTSUPP;

	return sk->sk_prot->diag_destroy(sk, ECONNABORTED);
}
```

Okay, so the vulnerability is the `sk->sk_protocol` access. Now let's see what `sk->sk_prot` actually *is* when we're dealing with a timewait socket or a request socket. We need to check where `diag_destroy` gets called for these types. Okay, so I should search for `twsk` and `diag_destroy` and related functions. I am not seeing `diag_destroy` directly. Let's look for `tcp_twsk_diag_destroy`, `tcp_twsk_deschedule_retry`, `tcp_abort`, or `inet_twsk_deschedule_put`. Let's see...

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

{
  "Output": "net/ipv4/sysctl_net_ipv4.c=627=static const struct ctl_table ipv4_net_table[] = {\n--\nnet/ipv4/sysctl_net_ipv4.c-1279-\t{\nnet/ipv4/sysctl_net_ipv4.c:1280:\t\t.procname\t= \"tcp_abort_on_overflow\",\nnet/ipv4/sysctl_net_ipv4.c:1281:\t\t.data\t\t= \u0026init_net.ipv4.sysctl_tcp_abort_on_overflow,\nnet/ipv4/sysctl_net_ipv4.c-1282-\t\t.maxlen\t\t= sizeof(u8),\n--\nnet/ipv4/tcp.c=5089=void tcp_done(struct sock *sk)\n--\nnet/ipv4/tcp.c-5114-\nnet/ipv4/tcp.c:5115:int tcp_abort(struct sock *sk, int err)\nnet/ipv4/tcp.c-5116-{\n--\nnet/ipv4/tcp.c-5167-}\nnet/ipv4/tcp.c:5168:EXPORT_SYMBOL_GPL(tcp_abort);\nnet/ipv4/tcp.c-5169-\n--\nnet/ipv4/tcp_ipv4.c=3347=struct proto tcp_prot = {\n--\nnet/ipv4/tcp_ipv4.c-3395-\t.no_autobind\t\t= true,\nnet/ipv4/tcp_ipv4.c:3396:\t.diag_destroy\t\t= tcp_abort,\nnet/ipv4/tcp_ipv4.c-3397-};\n--\nnet/ipv4/tcp_minisocks.c=687=struct sock *tcp_check_req(struct sock *sk, struct sk_buff *skb,\n--\nnet/ipv4/tcp_minisocks.c-958-\nnet/ipv4/tcp_minisocks.c:959:\tif (!READ_ONCE(sock_net(sk)-\u003eipv4.sysctl_tcp_abort_on_overflow)) {\nnet/ipv4/tcp_minisocks.c-960-\t\tinet_rsk(req)-\u003eacked = 1;\n--\nnet/ipv6/tcp_ipv6.c=2276=struct proto tcpv6_prot = {\n--\nnet/ipv6/tcp_ipv6.c-2325-\t.no_autobind\t\t= true,\nnet/ipv6/tcp_ipv6.c:2326:\t.diag_destroy\t\t= tcp_abort,\nnet/ipv6/tcp_ipv6.c-2327-};\n--\nnet/mptcp/subflow.c=2096=static void tcp_release_cb_override(struct sock *ssk)\n--\nnet/mptcp/subflow.c-2111-\nnet/mptcp/subflow.c:2112:static int tcp_abort_override(struct sock *ssk, int err)\nnet/mptcp/subflow.c-2113-{\n--\nnet/mptcp/subflow.c-2119-\nnet/mptcp/subflow.c:2120:\treturn tcp_abort(ssk, err);\nnet/mptcp/subflow.c-2121-}\n--\nnet/mptcp/subflow.c=2146=void __init mptcp_subflow_init(void)\n--\nnet/mptcp/subflow.c-2166-\ttcp_prot_override.release_cb = tcp_release_cb_override;\nnet/mptcp/subflow.c:2167:\ttcp_prot_override.diag_destroy = tcp_abort_override;\nnet/mptcp/subflow.c-2168-#ifdef CONFIG_BPF_SYSCALL\n--\nnet/mptcp/subflow.c=2180=void __init mptcp_subflow_v6_init(void)\n--\nnet/mptcp/subflow.c-2213-\ttcpv6_prot_override.release_cb = tcp_release_cb_override;\nnet/mptcp/subflow.c:2214:\ttcpv6_prot_override.diag_destroy = tcp_abort_override;\nnet/mptcp/subflow.c-2215-#ifdef CONFIG_BPF_SYSCALL\n--\nnet/smc/af_smc.c=328=int smc_release(struct socket *sock)\n--\nnet/smc/af_smc.c-343-\tif (smc-\u003econnect_nonblock \u0026\u0026 old_state == SMC_INIT)\nnet/smc/af_smc.c:344:\t\ttcp_abort(smc-\u003eclcsock-\u003esk, ECONNABORTED);\nnet/smc/af_smc.c-345-\n--\nnet/smc/smc_close.c=128=void smc_close_active_abort(struct smc_sock *smc)\n--\nnet/smc/smc_close.c-135-\t\tif (smc-\u003eclcsock \u0026\u0026 smc-\u003eclcsock-\u003esk)\nnet/smc/smc_close.c:136:\t\t\ttcp_abort(smc-\u003eclcsock-\u003esk, ECONNABORTED);\nnet/smc/smc_close.c-137-\t}\n"
}

gemini-3.7-flash

null

null

							input: 13992
							output: 37
							thoughts: 20
						

Here's my summary, as though I'm reading and processing the `tcp_abort` function:

**Diving into `tcp_abort`**

Okay, let's get into the guts of `net/ipv4/tcp.c` and specifically, that `tcp_abort` function. I need to understand how TCP connections are gracefully (or, less gracefully, depending on the situation) torn down when something goes wrong at the kernel level. Right away, I'm expecting this function to be critical for handling a variety of error scenarios – things like unrecoverable congestion, RST segments being received when we weren't expecting them, or perhaps internal kernel inconsistencies.

I'll be paying close attention to the state transitions. How does this function influence the TCP state machine? Does it always trigger a hard reset? Or are there more nuanced approaches depending on the current connection state? I imagine there are different codepaths depending on whether the connection is ESTABLISHED, LISTEN, or in some other interim state. Handling a FIN_WAIT state differently than a SYN_SENT state is going to be key, and I’ll be watching for those specific logic branches.

I'm also curious about how it interacts with other parts of the TCP stack. How does it signal the application layer about the connection's demise? Does it send an error code back to the application or is the socket simply closed? And what about resource cleanup? Does it handle releasing any allocated buffers, timers, or other connection-specific data structures? A memory leak here is unacceptable. The level of detail and care in these areas will give me the best view of the quality of the stack, and how robust it is.

The use of locks is also a concern. I'll need to figure out what data structures it protects and the potential for any race conditions. A function like this is going to be critical for ensuring data integrity, and I want to see how that's handled. Finally, I'm hoping to see well-commented code, as it's imperative that I gain a comprehensive understanding of the rationale behind this function's design.

{
  "File": "net/ipv4/tcp.c",
  "FirstLine": 5115,
  "LineCount": 55
}

{
  "Contents": "5115:\tint tcp_abort(struct sock *sk, int err)\n5116:\t{\n5117:\t\tint state = inet_sk_state_load(sk);\n5118:\t\n5119:\t\tif (state == TCP_NEW_SYN_RECV) {\n5120:\t\t\tstruct request_sock *req = inet_reqsk(sk);\n5121:\t\n5122:\t\t\tlocal_bh_disable();\n5123:\t\t\tinet_csk_reqsk_queue_drop(req-\u003ersk_listener, req);\n5124:\t\t\tlocal_bh_enable();\n5125:\t\t\treturn 0;\n5126:\t\t}\n5127:\t\tif (state == TCP_TIME_WAIT) {\n5128:\t\t\tstruct inet_timewait_sock *tw = inet_twsk(sk);\n5129:\t\n5130:\t\t\trefcount_inc(\u0026tw-\u003etw_refcnt);\n5131:\t\t\tlocal_bh_disable();\n5132:\t\t\tinet_twsk_deschedule_put(tw);\n5133:\t\t\tlocal_bh_enable();\n5134:\t\t\treturn 0;\n5135:\t\t}\n5136:\t\n5137:\t\t/* BPF context ensures sock locking. */\n5138:\t\tif (!has_current_bpf_ctx())\n5139:\t\t\t/* Don't race with userspace socket closes such as tcp_close. */\n5140:\t\t\tlock_sock(sk);\n5141:\t\n5142:\t\t/* Avoid closing the same socket twice. */\n5143:\t\tif (sk-\u003esk_state == TCP_CLOSE) {\n5144:\t\t\tif (!has_current_bpf_ctx())\n5145:\t\t\t\trelease_sock(sk);\n5146:\t\t\treturn -ENOENT;\n5147:\t\t}\n5148:\t\n5149:\t\tif (sk-\u003esk_state == TCP_LISTEN) {\n5150:\t\t\ttcp_set_state(sk, TCP_CLOSE);\n5151:\t\t\tinet_csk_listen_stop(sk);\n5152:\t\t}\n5153:\t\n5154:\t\t/* Don't race with BH socket closes such as inet_csk_listen_stop. */\n5155:\t\tlocal_bh_disable();\n5156:\t\tbh_lock_sock(sk);\n5157:\t\n5158:\t\tif (tcp_need_reset(sk-\u003esk_state))\n5159:\t\t\ttcp_send_active_reset(sk, SK_RST_REASON_TCP_STATE);\n5160:\t\ttcp_done_with_error(sk, err);\n5161:\t\n5162:\t\tbh_unlock_sock(sk);\n5163:\t\tlocal_bh_enable();\n5164:\t\tif (!has_current_bpf_ctx())\n5165:\t\t\trelease_sock(sk);\n5166:\t\treturn 0;\n5167:\t}\n5168:\tEXPORT_SYMBOL_GPL(tcp_abort);\n5169:\t\n"
}

gemini-3.7-flash

null

null

							input: 15306
							output: 254
							thoughts: 1151
						

**KMSAN Reasoning for TCP Time-Wait Socket Destruction in BPF**

Okay, let's break this down. My goal here is to determine if this patch requires KMSAN or if KASAN and standard debuggers are sufficient. The core change focuses on safely destroying TCP TIME_WAIT sockets and similar "mini-sockets" within the BPF context via `bpf_sock_destroy`. Specifically, it addresses an out-of-bounds read vulnerability when `sk->sk_protocol` was accessed on these non-full sockets, which use `inet_timewait_sock` instead of `struct sock`.

Initially, `tcp_abort` was used to handle the cleanup and it touched these time-wait sockets. Now, this patch now checks `sk_fullsock(sk)` *before* accessing `sk->sk_protocol`. If it *is* a full socket, it proceeds with the protocol check. If it's *not* full (like a `TIME_WAIT` socket), it invokes `sk->sk_prot->diag_destroy` (which is `tcp_abort` here) to cleanly handle destruction, ensuring we avoid the out-of-bounds read issue. We're also adding selftests to verify this behavior.

Now, the crucial question: does this introduce any KMSAN-specific risks? Let's go through the KMSAN criteria:

*   **User-space copies/leaks?** Nope. No new kernel structures are being sent to user space. There's no data copying using `copy_to_user`, `put_user`, netlink, etc.
*   **Uninitialized variables/conditional logic?** Absolutely not. The code is *preventing* an out-of-bounds read and not adding any logic that depends on uninitialized data. We are adding a check to ensure we only access the full socket.
*   **Complex allocations?** No new allocations that introduce uninitialized memory are present.
*   **Bounds checks/length issues?** The main change *is* a bounds check, but it's *strengthening* the bounds checking. The check ensures we're *not* accessing potentially uninitialized memory. It protects `sk->sk_protocol`.

In fact, this patch is *preventing* the potential for uninitialized memory reads. The previous code was accessing `sk->sk_protocol` on what were essentially, smaller `sock_common` structures. The new logic is designed to *avoid* that.

The bugs potentially introduced are of the type KASAN or standard debuggers are built to find. For example, if there were issues with socket reference counting, use-after-free, or if `diag_destroy` was incorrectly called, these would likely manifest as use-after-free, double frees, or other memory corruption issues, which are all well-covered by KASAN and lockdep.

Therefore, the reasoning is as follows:

*   **KASAN / Standard Detectors:** The patch mainly addresses potential out-of-bounds reads and socket lifecycle issues related to these non-full sockets. These risks are related to refcounting, socket lifecycle/locking (handled by `inet_twsk_deschedule_put`), use-after-free, and invalid dereferences, which are monitored by KASAN, LOCKDEP, and the standard kernel debugging facilities.
*   **KMSAN:** The patch does *not* introduce memory copies to user space, uninitialized buffer allocations, padding leaks, or uninitialized variable reads. Actually, the patch *prevents* an out-of-bounds reading of `sk_protocol` on mini-sockets, so there are no uninitialized memory risks that require KMSAN.

So, `NeedsKMSAN = false`. We can safely mark this as not needing KMSAN fuzzing.

{
  "KMSANReasoning": "The patch modifies the BPF kfunc `bpf_sock_destroy()` in `net/core/filter.c` to support non-full sockets (such as TCP TIME_WAIT sockets) by checking `sk_fullsock(sk)` before inspecting `sk-\u003esk_protocol`, and invokes `sk-\u003esk_prot-\u003ediag_destroy(sk, ECONNABORTED)`. The accompanying changes are BPF selftests.\n\nKMSAN vs KASAN applicability:\n- KMSAN detects reads of uninitialized memory and kernel-to-user info leaks. This patch introduces no uninitialized memory allocations, no structure copying to userspace (via copy_to_user, netlink, ioctl, etc.), and no branching on uninitialized data.\n- The potential risks associated with socket destruction (e.g., socket lifecycle/refcounting races, locking issues, use-after-free or out-of-bounds dereferences) are covered by KASAN, LOCKDEP, and standard memory corruption detectors.\n- Therefore, a dedicated KMSAN fuzzing session is not warranted.",
  "NeedsKMSAN": false
}

{
  "KMSANReasoning": "The patch modifies the BPF kfunc `bpf_sock_destroy()` in `net/core/filter.c` to support non-full sockets (such as TCP TIME_WAIT sockets) by checking `sk_fullsock(sk)` before inspecting `sk-\u003esk_protocol`, and invokes `sk-\u003esk_prot-\u003ediag_destroy(sk, ECONNABORTED)`. The accompanying changes are BPF selftests.\n\nKMSAN vs KASAN applicability:\n- KMSAN detects reads of uninitialized memory and kernel-to-user info leaks. This patch introduces no uninitialized memory allocations, no structure copying to userspace (via copy_to_user, netlink, ioctl, etc.), and no branching on uninitialized data.\n- The potential risks associated with socket destruction (e.g., socket lifecycle/refcounting races, locking issues, use-after-free or out-of-bounds dereferences) are covered by KASAN, LOCKDEP, and standard memory corruption detectors.\n- Therefore, a dedicated KMSAN fuzzing session is not warranted.",
  "NeedsKMSAN": false
}