AI Trajectory

null

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "KMSANReasoning": "",
  "NeedsKMSAN": false,
  "Reasoning": "The patch exclusively modifies user-space code within tools/ (libbpf in tools/lib/bpf/elf.c and BPF selftests in tools/testing/selftests/bpf/). It does not modify the compiled kernel image (vmlinux) or any kernel modules.",
  "WorthFuzzing": false
}

null

{
  "PatchDiff": "commit 59c9e9ad10383075fb14bccd8493bd9ec375cdb8\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Sat Oct 24 03:49:05 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/tools/lib/bpf/elf.c b/tools/lib/bpf/elf.c\nindex 700c3911a0d54..76baaf7785cbf 100644\n--- a/tools/lib/bpf/elf.c\n+++ b/tools/lib/bpf/elf.c\n@@ -438,8 +438,11 @@ int elf_resolve_syms_offsets(const char *binary_path, int cnt,\n \t\tstruct elf_sym *sym;\n \n \t\terr = elf_sym_iter_new(\u0026iter, elf_fd.elf, binary_path, sh_types[i], st_type);\n-\t\tif (err == -ENOENT)\n+\t\tif (err == -ENOENT) {\n+\t\t\t/* A missing symbol table is OK; check the other one. */\n+\t\t\terr = 0;\n \t\t\tcontinue;\n+\t\t}\n \t\tif (err)\n \t\t\tgoto out;\n \ndiff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile\nindex 1e4af62e8312e..4125133d4dab6 100644\n--- a/tools/testing/selftests/bpf/Makefile\n+++ b/tools/testing/selftests/bpf/Makefile\n@@ -61,7 +61,8 @@ TEST_GEN_PROGS_EXTENDED = \\\n \txdp_synproxy \\\n \txskxceiver\n \n-TEST_GEN_FILES += $(TEST_KMODS) liburandom_read.so urandom_read sign-file uprobe_multi\n+TEST_GEN_FILES += $(TEST_KMODS) liburandom_read.so urandom_read sign-file uprobe_multi \\\n+\tuprobe_multi_stripped.so\n \n ifneq ($(V),1)\n submake_extras := feature_display=0\n@@ -666,6 +667,10 @@ $(OUTPUT)/uprobe_multi: uprobe_multi.c uprobe_multi.ld\n \t$(Q)$(CC) $(CFLAGS) -Wl,-T,uprobe_multi.ld -O0 $(LDFLAGS) \t\\\n \t\t$(filter-out %.ld,$^) $(LDLIBS) -o $@\n \n+$(OUTPUT)/uprobe_multi_stripped.so: uprobe_multi_stripped.c\n+\t$(call msg,BINARY,,$@)\n+\t$(Q)$(CC) $(CFLAGS) -fPIC -shared -Wl,-s $(LDFLAGS) $\u003c -o $@\n+\n EXTRA_CLEAN := $(SCRATCH_DIR) $(HOST_SCRATCH_DIR)\t\t\t\\\n \tprog_tests/tests.h map_tests/tests.h verifier/tests.h\t\t\\\n \tfeature bpftool $(TEST_KMOD_TARGETS)\t\t\t\t\\\ndiff --git a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c\nindex f0baf5738b751..340e3b55c44aa 100644\n--- a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c\n+++ b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c\n@@ -374,6 +374,41 @@ static void test_attach_api_syms(void)\n \ttest_attach_api(\"/proc/self/exe\", NULL, \u0026opts);\n }\n \n+static void test_attach_api_syms_stripped(void)\n+{\n+\tLIBBPF_OPTS(bpf_uprobe_multi_opts, opts);\n+\tconst char *syms[] = { \"uprobe_multi_stripped_func\" };\n+\tstruct uprobe_multi *skel = NULL;\n+\tstruct bpf_link *link = NULL;\n+\n+\topts.syms = syms;\n+\topts.cnt = ARRAY_SIZE(syms);\n+\n+\tskel = uprobe_multi__open_and_load();\n+\tif (!ASSERT_OK_PTR(skel, \"uprobe_multi__open_and_load\"))\n+\t\treturn;\n+\n+\tlink = bpf_program__attach_uprobe_multi(skel-\u003eprogs.uprobe, -1,\n+\t\t\t\t\t\t\"./uprobe_multi_stripped.so\", NULL, \u0026opts);\n+\tif (!ASSERT_OK_PTR(link, \"attach_uprobe_multi_stripped\")) {\n+\t\tlink = NULL;\n+\t\tgoto cleanup;\n+\t}\n+\tbpf_link__destroy(link);\n+\tlink = NULL;\n+\n+\t/* A missing symbol must still be reported as an error. */\n+\tsyms[0] = \"uprobe_multi_missing_func\";\n+\tlink = bpf_program__attach_uprobe_multi(skel-\u003eprogs.uprobe, -1,\n+\t\t\t\t\t\t\"./uprobe_multi_stripped.so\", NULL, \u0026opts);\n+\tif (!ASSERT_ERR_PTR(link, \"attach_uprobe_multi_missing_symbol\"))\n+\t\tbpf_link__destroy(link);\n+\tlink = NULL;\n+\n+cleanup:\n+\tuprobe_multi__destroy(skel);\n+}\n+\n static void test_attach_api_fails(void)\n {\n \tLIBBPF_OPTS(bpf_link_create_opts, opts);\n@@ -1442,6 +1477,8 @@ void test_uprobe_multi_test(void)\n \t\ttest_attach_api_pattern();\n \tif (test__start_subtest(\"attach_api_syms\"))\n \t\ttest_attach_api_syms();\n+\tif (test__start_subtest(\"attach_api_syms_stripped\"))\n+\t\ttest_attach_api_syms_stripped();\n \tif (test__start_subtest(\"link_api\"))\n \t\ttest_link_api();\n \tif (test__start_subtest(\"link_api_path_fd\"))\ndiff --git a/tools/testing/selftests/bpf/uprobe_multi_stripped.c b/tools/testing/selftests/bpf/uprobe_multi_stripped.c\nnew file mode 100644\nindex 0000000000000..9bdf7fb9ba8d0\n--- /dev/null\n+++ b/tools/testing/selftests/bpf/uprobe_multi_stripped.c\n@@ -0,0 +1,7 @@\n+// SPDX-License-Identifier: GPL-2.0\n+\n+__attribute__((noinline, visibility(\"default\")))\n+int uprobe_multi_stripped_func(void)\n+{\n+\treturn 42;\n+}\n"
}

core

null

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch exclusively modifies user-space code within tools/ (libbpf in tools/lib/bpf/elf.c and BPF selftests in tools/testing/selftests/bpf/). It does not modify the compiled kernel image (vmlinux) or any kernel modules.",
  "WorthFuzzing": false
}

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 59c9e9ad10383075fb14bccd8493bd9ec375cdb8
Author: syz-cluster <triage@syzkaller.com>
Date:   Sat Oct 24 03:49:05 2026 +0000

    syz-cluster: applied patch under review

diff --git a/tools/lib/bpf/elf.c b/tools/lib/bpf/elf.c
index 700c3911a0d54..76baaf7785cbf 100644
--- a/tools/lib/bpf/elf.c
+++ b/tools/lib/bpf/elf.c
@@ -438,8 +438,11 @@ int elf_resolve_syms_offsets(const char *binary_path, int cnt,
 		struct elf_sym *sym;
 
 		err = elf_sym_iter_new(&iter, elf_fd.elf, binary_path, sh_types[i], st_type);
-		if (err == -ENOENT)
+		if (err == -ENOENT) {
+			/* A missing symbol table is OK; check the other one. */
+			err = 0;
 			continue;
+		}
 		if (err)
 			goto out;
 
diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 1e4af62e8312e..4125133d4dab6 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -61,7 +61,8 @@ TEST_GEN_PROGS_EXTENDED = \
 	xdp_synproxy \
 	xskxceiver
 
-TEST_GEN_FILES += $(TEST_KMODS) liburandom_read.so urandom_read sign-file uprobe_multi
+TEST_GEN_FILES += $(TEST_KMODS) liburandom_read.so urandom_read sign-file uprobe_multi \
+	uprobe_multi_stripped.so
 
 ifneq ($(V),1)
 submake_extras := feature_display=0
@@ -666,6 +667,10 @@ $(OUTPUT)/uprobe_multi: uprobe_multi.c uprobe_multi.ld
 	$(Q)$(CC) $(CFLAGS) -Wl,-T,uprobe_multi.ld -O0 $(LDFLAGS) 	\
 		$(filter-out %.ld,$^) $(LDLIBS) -o $@
 
+$(OUTPUT)/uprobe_multi_stripped.so: uprobe_multi_stripped.c
+	$(call msg,BINARY,,$@)
+	$(Q)$(CC) $(CFLAGS) -fPIC -shared -Wl,-s $(LDFLAGS) $< -o $@
+
 EXTRA_CLEAN := $(SCRATCH_DIR) $(HOST_SCRATCH_DIR)			\
 	prog_tests/tests.h map_tests/tests.h verifier/tests.h		\
 	feature bpftool $(TEST_KMOD_TARGETS)				\
diff --git a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c
index f0baf5738b751..340e3b55c44aa 100644
--- a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c
+++ b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c
@@ -374,6 +374,41 @@ static void test_attach_api_syms(void)
 	test_attach_api("/proc/self/exe", NULL, &opts);
 }
 
+static void test_attach_api_syms_stripped(void)
+{
+	LIBBPF_OPTS(bpf_uprobe_multi_opts, opts);
+	const char *syms[] = { "uprobe_multi_stripped_func" };
+	struct uprobe_multi *skel = NULL;
+	struct bpf_link *link = NULL;
+
+	opts.syms = syms;
+	opts.cnt = ARRAY_SIZE(syms);
+
+	skel = uprobe_multi__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "uprobe_multi__open_and_load"))
+		return;
+
+	link = bpf_program__attach_uprobe_multi(skel->progs.uprobe, -1,
+						"./uprobe_multi_stripped.so", NULL, &opts);
+	if (!ASSERT_OK_PTR(link, "attach_uprobe_multi_stripped")) {
+		link = NULL;
+		goto cleanup;
+	}
+	bpf_link__destroy(link);
+	link = NULL;
+
+	/* A missing symbol must still be reported as an error. */
+	syms[0] = "uprobe_multi_missing_func";
+	link = bpf_program__attach_uprobe_multi(skel->progs.uprobe, -1,
+						"./uprobe_multi_stripped.so", NULL, &opts);
+	if (!ASSERT_ERR_PTR(link, "attach_uprobe_multi_missing_symbol"))
+		bpf_link__destroy(link);
+	link = NULL;
+
+cleanup:
+	uprobe_multi__destroy(skel);
+}
+
 static void test_attach_api_fails(void)
 {
 	LIBBPF_OPTS(bpf_link_create_opts, opts);
@@ -1442,6 +1477,8 @@ void test_uprobe_multi_test(void)
 		test_attach_api_pattern();
 	if (test__start_subtest("attach_api_syms"))
 		test_attach_api_syms();
+	if (test__start_subtest("attach_api_syms_stripped"))
+		test_attach_api_syms_stripped();
 	if (test__start_subtest("link_api"))
 		test_link_api();
 	if (test__start_subtest("link_api_path_fd"))
diff --git a/tools/testing/selftests/bpf/uprobe_multi_stripped.c b/tools/testing/selftests/bpf/uprobe_multi_stripped.c
new file mode 100644
index 0000000000000..9bdf7fb9ba8d0
--- /dev/null
+++ b/tools/testing/selftests/bpf/uprobe_multi_stripped.c
@@ -0,0 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0
+
+__attribute__((noinline, visibility("default")))
+int uprobe_multi_stripped_func(void)
+{
+	return 42;
+}

gemini-3.8-flash

null

null

							input: 4491
							output: 93
							thoughts: 863
						

**Patch Evaluation: Non-Fuzzable Changes**

Okay, let's take a look at this patch series. First, I need to get a handle on what's been modified. It seems the changed files are: `tools/lib/bpf/elf.c`, `tools/testing/selftests/bpf/Makefile`, `tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c`, and `tools/testing/selftests/bpf/uprobe_multi_stripped.c`.  All within the `tools/` directory – that immediately raises a flag.

Now, let's go back and carefully assess the evaluation instructions. Specifically, the "NEGATIVE CRITERIA" section.  I need to determine if *all* the modifications fall under a "WorthFuzzing=false" scenario. The criteria are very specific, and I need to make sure I don't miss anything.

The instructions clearly state that user-space directories, selftests, samples, or scripts that do not affect the compiled kernel image are a no-go for fuzzing.  And that is exactly what we have here.  `tools/lib/bpf/elf.c` is part of libbpf, a user-space library, and the other files are BPF selftests. These don't touch any kernel code directly, and thus, syzkaller wouldn't be able to fuzz them.

Just to be absolutely certain, I'm confirming that there's nothing else lurking that I might have missed. Looking at the diff, it appears my initial assessment is correct.  Everything is within the `tools/` directory.

So, I'm confident in setting `WorthFuzzing` to `false`.

Now, I need to ensure I set the fields correctly for the `set-results` tool. We need `WorthFuzzing` to be `false`, an explanation, and the other fields (FocusSymbols and EnableConfigs) are empty.

The reasoning must be clear and concise. I'll summarize it as: "The patch exclusively modifies user-space code within tools/ (specifically libbpf in tools/lib/bpf/elf.c and BPF selftests in tools/testing/selftests/bpf/). These changes do not affect the compiled kernel image (vmlinux) or kernel modules, and are therefore not fuzzable via syzkaller." This clearly communicates why this patch is not suitable for fuzzing.

Alright, that's it. It's a straightforward case. Everything's in order, and it's time to set the results.

{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch exclusively modifies user-space code within tools/ (libbpf in tools/lib/bpf/elf.c and BPF selftests in tools/testing/selftests/bpf/). It does not modify the compiled kernel image (vmlinux) or any kernel modules.",
  "WorthFuzzing": false
}

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch exclusively modifies user-space code within tools/ (libbpf in tools/lib/bpf/elf.c and BPF selftests in tools/testing/selftests/bpf/). It does not modify the compiled kernel image (vmlinux) or any kernel modules.",
  "WorthFuzzing": false
}

{
  "WorthFuzzing": false
}

null