AI Trajectory

null

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "KMSANReasoning": "",
  "NeedsKMSAN": false,
  "Reasoning": "The patch only modifies BPF selftests in tools/testing/selftests/bpf/ and does not make functional changes to the Linux kernel runtime or core subsystems.",
  "WorthFuzzing": false
}

null

{
  "PatchDiff": "commit 280c9afb49ddaa2d422b3062d0dd1273170c4e75\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Wed Sep 2 04:49:37 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/tools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c b/tools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c\nindex bfb1bf3fd427b..849f33259c003 100644\n--- a/tools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c\n+++ b/tools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c\n@@ -2,29 +2,45 @@\n /* Copyright (c) 2022 Bytedance */\n \n #include \u003ctest_progs.h\u003e\n+#include \"bpf/libbpf_internal.h\"\n #include \"test_map_lookup_percpu_elem.skel.h\"\n \n void test_map_lookup_percpu_elem(void)\n {\n \tstruct test_map_lookup_percpu_elem *skel;\n-\t__u64 key = 0, sum;\n-\tint ret, i, nr_cpus = libbpf_num_possible_cpus();\n+\tbool *possible = NULL;\n+\t__u64 key = 0, sum = 0;\n+\tint cpu, nr_cpu_ids, nr_cpus, ret, slot = 0;\n \t__u64 *buf;\n \n-\tbuf = malloc(nr_cpus*sizeof(__u64));\n-\tif (!ASSERT_OK_PTR(buf, \"malloc\"))\n+\tret = parse_cpu_mask_file(\"/sys/devices/system/cpu/possible\", \u0026possible,\n+\t\t\t\t  \u0026nr_cpu_ids);\n+\tif (!ASSERT_OK(ret, \"parse possible CPU mask\"))\n \t\treturn;\n \n-\tfor (i = 0; i \u003c nr_cpus; i++)\n-\t\tbuf[i] = i;\n-\tsum = (nr_cpus - 1) * nr_cpus / 2;\n+\tnr_cpus = libbpf_num_possible_cpus();\n+\tif (!ASSERT_GT(nr_cpus, 0, \"libbpf_num_possible_cpus\"))\n+\t\tgoto free_mask;\n+\n+\tbuf = malloc(nr_cpus * sizeof(*buf));\n+\tif (!ASSERT_OK_PTR(buf, \"malloc\"))\n+\t\tgoto free_mask;\n+\n+\tfor (cpu = 0; cpu \u003c nr_cpu_ids; cpu++) {\n+\t\tif (!possible[cpu])\n+\t\t\tcontinue;\n+\t\tbuf[slot++] = cpu;\n+\t\tsum += cpu;\n+\t}\n+\tif (!ASSERT_EQ(slot, nr_cpus, \"possible CPU mask weight\"))\n+\t\tgoto exit;\n \n \tskel = test_map_lookup_percpu_elem__open();\n \tif (!ASSERT_OK_PTR(skel, \"test_map_lookup_percpu_elem__open\"))\n \t\tgoto exit;\n \n \tskel-\u003erodata-\u003emy_pid = getpid();\n-\tskel-\u003erodata-\u003enr_cpus = nr_cpus;\n+\tskel-\u003erodata-\u003enr_cpu_ids = nr_cpu_ids;\n \n \tret = test_map_lookup_percpu_elem__load(skel);\n \tif (!ASSERT_OK(ret, \"test_map_lookup_percpu_elem__load\"))\n@@ -55,4 +71,6 @@ void test_map_lookup_percpu_elem(void)\n \ttest_map_lookup_percpu_elem__destroy(skel);\n exit:\n \tfree(buf);\n+free_mask:\n+\tfree(possible);\n }\ndiff --git a/tools/testing/selftests/bpf/progs/test_map_lookup_percpu_elem.c b/tools/testing/selftests/bpf/progs/test_map_lookup_percpu_elem.c\nindex ca827b1092daa..d8da0696b97cf 100644\n--- a/tools/testing/selftests/bpf/progs/test_map_lookup_percpu_elem.c\n+++ b/tools/testing/selftests/bpf/progs/test_map_lookup_percpu_elem.c\n@@ -7,7 +7,7 @@\n __u64 percpu_array_elem_sum = 0;\n __u64 percpu_hash_elem_sum = 0;\n __u64 percpu_lru_hash_elem_sum = 0;\n-const volatile int nr_cpus;\n+const volatile int nr_cpu_ids;\n const volatile int my_pid;\n \n struct {\n@@ -57,17 +57,17 @@ int sysenter_getuid(const void *ctx)\n \n \tmap_ctx.map = \u0026percpu_array_map;\n \tmap_ctx.sum = 0;\n-\tbpf_loop(nr_cpus, read_percpu_elem_callback, \u0026map_ctx, 0);\n+\tbpf_loop(nr_cpu_ids, read_percpu_elem_callback, \u0026map_ctx, 0);\n \tpercpu_array_elem_sum = map_ctx.sum;\n \n \tmap_ctx.map = \u0026percpu_hash_map;\n \tmap_ctx.sum = 0;\n-\tbpf_loop(nr_cpus, read_percpu_elem_callback, \u0026map_ctx, 0);\n+\tbpf_loop(nr_cpu_ids, read_percpu_elem_callback, \u0026map_ctx, 0);\n \tpercpu_hash_elem_sum = map_ctx.sum;\n \n \tmap_ctx.map = \u0026percpu_lru_hash_map;\n \tmap_ctx.sum = 0;\n-\tbpf_loop(nr_cpus, read_percpu_elem_callback, \u0026map_ctx, 0);\n+\tbpf_loop(nr_cpu_ids, read_percpu_elem_callback, \u0026map_ctx, 0);\n \tpercpu_lru_hash_elem_sum = map_ctx.sum;\n \n \treturn 0;\n"
}

core

null

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies BPF selftests in tools/testing/selftests/bpf/ and does not make functional changes to the Linux kernel runtime or core subsystems.",
  "WorthFuzzing": false
}

You are an expert Linux kernel maintainer.
Your job is to review a provided patch series and determine
if it makes functional changes to the kernel that should be fuzzed.

IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively
use your code access tools to examine the actual source code and confirm any assumptions.

Return WorthFuzzing=false if the patch only contains:
- Modifications to Documentation/, Kconfig files, or code comments.
- Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints.
- Changes to numeric constants or macros that do not functionally alter execution flow.
- Code paths that are impossible to reach in virtualized environments like GCE or QEMU,
  even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim).
- Code in vendor-specific PCIe switch, SmartNIC, or GPU drivers (e.g., mlxsw, pds_core, qed,
  ionic, amdgpu) that require physical PCIe hardware cards not emulated in standard QEMU.
- Driver .remove, .shutdown, or pci_unregister_driver teardown callbacks (e.g., igb_remove)
  that are executed only during PCI hot-unplug or sysfs driver unbind operations.

If it modifies reachable core kernel logic, drivers, or architectures, use your code search
tools to verify the code can be executed, then return WorthFuzzing=true.

When returning WorthFuzzing=true, you MUST ALSO:
1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols.
   Avoid listing generic hot-path functions to prevent skewed test distributions.
   Prefer non-static, non-inlined API entrypoint functions over internal static helper functions
   (which are inlined by the compiler and do not have distinct symbol addresses).
2. Identify any specific CONFIG_ options required to properly test this new/modified feature.
   Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions.
   Also check "depends on" lines in Kconfig to include any non-standard parent subsystem configs
   needed for Kbuild to compile the code statically into vmlinux. List them in the EnableConfigs
   output array, and DO NOT add a '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.

For your convenience, here is the diff of the changes:
commit 280c9afb49ddaa2d422b3062d0dd1273170c4e75
Author: syz-cluster <triage@syzkaller.com>
Date:   Wed Sep 2 04:49:37 2026 +0000

    syz-cluster: applied patch under review

diff --git a/tools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c b/tools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c
index bfb1bf3fd427b..849f33259c003 100644
--- a/tools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c
+++ b/tools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c
@@ -2,29 +2,45 @@
 /* Copyright (c) 2022 Bytedance */
 
 #include <test_progs.h>
+#include "bpf/libbpf_internal.h"
 #include "test_map_lookup_percpu_elem.skel.h"
 
 void test_map_lookup_percpu_elem(void)
 {
 	struct test_map_lookup_percpu_elem *skel;
-	__u64 key = 0, sum;
-	int ret, i, nr_cpus = libbpf_num_possible_cpus();
+	bool *possible = NULL;
+	__u64 key = 0, sum = 0;
+	int cpu, nr_cpu_ids, nr_cpus, ret, slot = 0;
 	__u64 *buf;
 
-	buf = malloc(nr_cpus*sizeof(__u64));
-	if (!ASSERT_OK_PTR(buf, "malloc"))
+	ret = parse_cpu_mask_file("/sys/devices/system/cpu/possible", &possible,
+				  &nr_cpu_ids);
+	if (!ASSERT_OK(ret, "parse possible CPU mask"))
 		return;
 
-	for (i = 0; i < nr_cpus; i++)
-		buf[i] = i;
-	sum = (nr_cpus - 1) * nr_cpus / 2;
+	nr_cpus = libbpf_num_possible_cpus();
+	if (!ASSERT_GT(nr_cpus, 0, "libbpf_num_possible_cpus"))
+		goto free_mask;
+
+	buf = malloc(nr_cpus * sizeof(*buf));
+	if (!ASSERT_OK_PTR(buf, "malloc"))
+		goto free_mask;
+
+	for (cpu = 0; cpu < nr_cpu_ids; cpu++) {
+		if (!possible[cpu])
+			continue;
+		buf[slot++] = cpu;
+		sum += cpu;
+	}
+	if (!ASSERT_EQ(slot, nr_cpus, "possible CPU mask weight"))
+		goto exit;
 
 	skel = test_map_lookup_percpu_elem__open();
 	if (!ASSERT_OK_PTR(skel, "test_map_lookup_percpu_elem__open"))
 		goto exit;
 
 	skel->rodata->my_pid = getpid();
-	skel->rodata->nr_cpus = nr_cpus;
+	skel->rodata->nr_cpu_ids = nr_cpu_ids;
 
 	ret = test_map_lookup_percpu_elem__load(skel);
 	if (!ASSERT_OK(ret, "test_map_lookup_percpu_elem__load"))
@@ -55,4 +71,6 @@ void test_map_lookup_percpu_elem(void)
 	test_map_lookup_percpu_elem__destroy(skel);
 exit:
 	free(buf);
+free_mask:
+	free(possible);
 }
diff --git a/tools/testing/selftests/bpf/progs/test_map_lookup_percpu_elem.c b/tools/testing/selftests/bpf/progs/test_map_lookup_percpu_elem.c
index ca827b1092daa..d8da0696b97cf 100644
--- a/tools/testing/selftests/bpf/progs/test_map_lookup_percpu_elem.c
+++ b/tools/testing/selftests/bpf/progs/test_map_lookup_percpu_elem.c
@@ -7,7 +7,7 @@
 __u64 percpu_array_elem_sum = 0;
 __u64 percpu_hash_elem_sum = 0;
 __u64 percpu_lru_hash_elem_sum = 0;
-const volatile int nr_cpus;
+const volatile int nr_cpu_ids;
 const volatile int my_pid;
 
 struct {
@@ -57,17 +57,17 @@ int sysenter_getuid(const void *ctx)
 
 	map_ctx.map = &percpu_array_map;
 	map_ctx.sum = 0;
-	bpf_loop(nr_cpus, read_percpu_elem_callback, &map_ctx, 0);
+	bpf_loop(nr_cpu_ids, read_percpu_elem_callback, &map_ctx, 0);
 	percpu_array_elem_sum = map_ctx.sum;
 
 	map_ctx.map = &percpu_hash_map;
 	map_ctx.sum = 0;
-	bpf_loop(nr_cpus, read_percpu_elem_callback, &map_ctx, 0);
+	bpf_loop(nr_cpu_ids, read_percpu_elem_callback, &map_ctx, 0);
 	percpu_hash_elem_sum = map_ctx.sum;
 
 	map_ctx.map = &percpu_lru_hash_map;
 	map_ctx.sum = 0;
-	bpf_loop(nr_cpus, read_percpu_elem_callback, &map_ctx, 0);
+	bpf_loop(nr_cpu_ids, read_percpu_elem_callback, &map_ctx, 0);
 	percpu_lru_hash_elem_sum = map_ctx.sum;
 
 	return 0;

gemini-3.7-flash

null

null

							input: 3417
							output: 22
							thoughts: 234
						

**My Assessment of This Patch**

Okay, so this patch is pretty straightforward. I've got two files, both within `tools/testing/selftests/bpf/`: `map_lookup_percpu_elem.c` and `test_map_lookup_percpu_elem.c`. Essentially, these are userspace selftests for BPF, located in the usual place for these things. The key is, I'm not seeing *any* modifications to the kernel source itself – no core logic, no driver changes, nothing that would impact the kernel runtime directly.

Now, let's go over the rules here. My understanding is, we shouldn't trigger fuzzing if the patch *only* contains changes to documentation, Kconfig files, or comments. In this case, `tools/testing/selftests/` are not part of the kernel runtime. They are purely userspace tests. Selftests are independent and don't modify kernel behavior. This means the proposed changes won't be reachable through syzkaller.

Just to be absolutely sure, I'll quickly double-check the commit to make sure there aren't any sneaky changes elsewhere, but based on what I've seen so far, this looks like a clear case of "WorthFuzzing=false".

{
  "Expression": "map_lookup_percpu_elem"
}

{
  "Output": "Documentation/bpf/map_array.rst=73=CPU.\nDocumentation/bpf/map_array.rst-74-\nDocumentation/bpf/map_array.rst:75:bpf_map_lookup_percpu_elem()\nDocumentation/bpf/map_array.rst-76-~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n--\nDocumentation/bpf/map_array.rst-79-\nDocumentation/bpf/map_array.rst:80:   void *bpf_map_lookup_percpu_elem(struct bpf_map *map, const void *key, u32 cpu)\nDocumentation/bpf/map_array.rst-81-\nDocumentation/bpf/map_array.rst:82:The ``bpf_map_lookup_percpu_elem()`` helper can be used to lookup the array\nDocumentation/bpf/map_array.rst-83-value for a specific CPU. Returns value on success , or ``NULL`` if no entry was\n--\nDocumentation/bpf/map_hash.rst=96=automatically access the hash slot for the current CPU.\nDocumentation/bpf/map_hash.rst-97-\nDocumentation/bpf/map_hash.rst:98:bpf_map_lookup_percpu_elem()\nDocumentation/bpf/map_hash.rst-99-~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n--\nDocumentation/bpf/map_hash.rst-102-\nDocumentation/bpf/map_hash.rst:103:   void *bpf_map_lookup_percpu_elem(struct bpf_map *map, const void *key, u32 cpu)\nDocumentation/bpf/map_hash.rst-104-\nDocumentation/bpf/map_hash.rst:105:The ``bpf_map_lookup_percpu_elem()`` helper can be used to lookup the\nDocumentation/bpf/map_hash.rst-106-value in the hash slot for a specific CPU. Returns value associated with\n--\ninclude/linux/bpf.h=87=struct bpf_map_ops {\n--\ninclude/linux/bpf.h-115-\tlong (*map_peek_elem)(struct bpf_map *map, void *value);\ninclude/linux/bpf.h:116:\tvoid *(*map_lookup_percpu_elem)(struct bpf_map *map, void *key, u32 cpu);\ninclude/linux/bpf.h-117-\tint (*map_get_hash)(struct bpf_map *map);\n--\ninclude/linux/bpf.h=3878=extern const struct bpf_func_proto bpf_map_peek_elem_proto;\ninclude/linux/bpf.h:3879:extern const struct bpf_func_proto bpf_map_lookup_percpu_elem_proto;\ninclude/linux/bpf.h-3880-\n--\ninclude/uapi/linux/bpf.h=1527=union bpf_attr {\n--\ninclude/uapi/linux/bpf.h-5738- *\ninclude/uapi/linux/bpf.h:5739: * void *bpf_map_lookup_percpu_elem(struct bpf_map *map, const void *key, u32 cpu)\ninclude/uapi/linux/bpf.h-5740- * \tDescription\n--\ninclude/uapi/linux/bpf.h-6197-\tFN(kptr_xchg, 194, ##ctx)\t\t\t\\\ninclude/uapi/linux/bpf.h:6198:\tFN(map_lookup_percpu_elem, 195, ##ctx)\t\t\\\ninclude/uapi/linux/bpf.h-6199-\tFN(skc_to_mptcp_sock, 196, ##ctx)\t\t\\\n--\nkernel/bpf/arraymap.c=294=static int percpu_array_map_gen_lookup(struct bpf_map *map, struct bpf_insn *insn_buf)\n--\nkernel/bpf/arraymap.c-324-\nkernel/bpf/arraymap.c:325:static void *percpu_array_map_lookup_percpu_elem(struct bpf_map *map, void *key, u32 cpu)\nkernel/bpf/arraymap.c-326-{\n--\nkernel/bpf/arraymap.c=885=const struct bpf_map_ops percpu_array_map_ops = {\n--\nkernel/bpf/arraymap.c-896-\t.map_delete_elem = array_map_delete_elem,\nkernel/bpf/arraymap.c:897:\t.map_lookup_percpu_elem = percpu_array_map_lookup_percpu_elem,\nkernel/bpf/arraymap.c-898-\t.map_seq_show_elem = percpu_array_map_seq_show_elem,\n--\nkernel/bpf/core.c=3152=const struct bpf_func_proto bpf_map_peek_elem_proto __weak;\nkernel/bpf/core.c:3153:const struct bpf_func_proto bpf_map_lookup_percpu_elem_proto __weak;\nkernel/bpf/core.c-3154-const struct bpf_func_proto bpf_spin_lock_proto __weak;\n--\nkernel/bpf/fixups.c=1508=int bpf_do_misc_fixups(struct bpf_verifier_env *env)\n--\nkernel/bpf/fixups.c-2055-\t\t     insn-\u003eimm == BPF_FUNC_for_each_map_elem ||\nkernel/bpf/fixups.c:2056:\t\t     insn-\u003eimm == BPF_FUNC_map_lookup_percpu_elem)) {\nkernel/bpf/fixups.c-2057-\t\t\taux = \u0026env-\u003einsn_aux_data[i + delta];\n--\nkernel/bpf/fixups.c-2107-\t\t\t\t\t      u64 flags))NULL));\nkernel/bpf/fixups.c:2108:\t\t\tBUILD_BUG_ON(!__same_type(ops-\u003emap_lookup_percpu_elem,\nkernel/bpf/fixups.c-2109-\t\t\t\t     (void *(*)(struct bpf_map *map, void *key, u32 cpu))NULL));\n--\nkernel/bpf/fixups.c-2136-\t\t\t\tgoto next_insn;\nkernel/bpf/fixups.c:2137:\t\t\tcase BPF_FUNC_map_lookup_percpu_elem:\nkernel/bpf/fixups.c:2138:\t\t\t\tinsn-\u003eimm = BPF_CALL_IMM(ops-\u003emap_lookup_percpu_elem);\nkernel/bpf/fixups.c-2139-\t\t\t\tgoto next_insn;\n--\nkernel/bpf/hashtab.c=2414=static int htab_percpu_map_gen_lookup(struct bpf_map *map, struct bpf_insn *insn_buf)\n--\nkernel/bpf/hashtab.c-2432-\nkernel/bpf/hashtab.c:2433:static void *htab_percpu_map_lookup_percpu_elem(struct bpf_map *map, void *key, u32 cpu)\nkernel/bpf/hashtab.c-2434-{\n--\nkernel/bpf/hashtab.c=2447=static void *htab_lru_percpu_map_lookup_elem(struct bpf_map *map, void *key)\n--\nkernel/bpf/hashtab.c-2458-\nkernel/bpf/hashtab.c:2459:static void *htab_lru_percpu_map_lookup_percpu_elem(struct bpf_map *map, void *key, u32 cpu)\nkernel/bpf/hashtab.c-2460-{\n--\nkernel/bpf/hashtab.c=2560=const struct bpf_map_ops htab_percpu_map_ops = {\n--\nkernel/bpf/hashtab.c-2570-\t.map_delete_elem = htab_map_delete_elem,\nkernel/bpf/hashtab.c:2571:\t.map_lookup_percpu_elem = htab_percpu_map_lookup_percpu_elem,\nkernel/bpf/hashtab.c-2572-\t.map_seq_show_elem = htab_percpu_map_seq_show_elem,\n--\nkernel/bpf/hashtab.c=2582=const struct bpf_map_ops htab_lru_percpu_map_ops = {\n--\nkernel/bpf/hashtab.c-2591-\t.map_delete_elem = htab_lru_map_delete_elem,\nkernel/bpf/hashtab.c:2592:\t.map_lookup_percpu_elem = htab_lru_percpu_map_lookup_percpu_elem,\nkernel/bpf/hashtab.c-2593-\t.map_seq_show_elem = htab_percpu_map_seq_show_elem,\n--\nkernel/bpf/helpers.c=125=const struct bpf_func_proto bpf_map_peek_elem_proto = {\n--\nkernel/bpf/helpers.c-132-\nkernel/bpf/helpers.c:133:BPF_CALL_3(bpf_map_lookup_percpu_elem, struct bpf_map *, map, void *, key, u32, cpu)\nkernel/bpf/helpers.c-134-{\nkernel/bpf/helpers.c-135-\tWARN_ON_ONCE(!bpf_rcu_lock_held());\nkernel/bpf/helpers.c:136:\treturn (unsigned long) map-\u003eops-\u003emap_lookup_percpu_elem(map, key, cpu);\nkernel/bpf/helpers.c-137-}\nkernel/bpf/helpers.c-138-\nkernel/bpf/helpers.c:139:const struct bpf_func_proto bpf_map_lookup_percpu_elem_proto = {\nkernel/bpf/helpers.c:140:\t.func\t\t= bpf_map_lookup_percpu_elem,\nkernel/bpf/helpers.c-141-\t.gpl_only\t= false,\n--\nkernel/bpf/helpers.c=2067=bpf_base_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)\n--\nkernel/bpf/helpers.c-2081-\t\treturn \u0026bpf_map_peek_elem_proto;\nkernel/bpf/helpers.c:2082:\tcase BPF_FUNC_map_lookup_percpu_elem:\nkernel/bpf/helpers.c:2083:\t\treturn \u0026bpf_map_lookup_percpu_elem_proto;\nkernel/bpf/helpers.c-2084-\tcase BPF_FUNC_get_prandom_u32:\n--\nkernel/bpf/verifier.c=9024=static int check_map_func_compatibility(struct bpf_verifier_env *env,\n--\nkernel/bpf/verifier.c-9239-\t\tbreak;\nkernel/bpf/verifier.c:9240:\tcase BPF_FUNC_map_lookup_percpu_elem:\nkernel/bpf/verifier.c-9241-\t\tif (map-\u003emap_type != BPF_MAP_TYPE_PERCPU_ARRAY \u0026\u0026\n--\nkernel/bpf/verifier.c=10521=record_func_map(struct bpf_verifier_env *env, struct bpf_call_arg_meta *meta,\n--\nkernel/bpf/verifier.c-10535-\t    func_id != BPF_FUNC_redirect_map \u0026\u0026\nkernel/bpf/verifier.c:10536:\t    func_id != BPF_FUNC_map_lookup_percpu_elem)\nkernel/bpf/verifier.c-10537-\t\treturn 0;\n--\ntools/include/uapi/linux/bpf.h=1527=union bpf_attr {\n--\ntools/include/uapi/linux/bpf.h-5738- *\ntools/include/uapi/linux/bpf.h:5739: * void *bpf_map_lookup_percpu_elem(struct bpf_map *map, const void *key, u32 cpu)\ntools/include/uapi/linux/bpf.h-5740- * \tDescription\n--\ntools/include/uapi/linux/bpf.h-6197-\tFN(kptr_xchg, 194, ##ctx)\t\t\t\\\ntools/include/uapi/linux/bpf.h:6198:\tFN(map_lookup_percpu_elem, 195, ##ctx)\t\t\\\ntools/include/uapi/linux/bpf.h-6199-\tFN(skc_to_mptcp_sock, 196, ##ctx)\t\t\\\n--\ntools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c-5-#include \"bpf/libbpf_internal.h\"\ntools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c:6:#include \"test_map_lookup_percpu_elem.skel.h\"\ntools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c-7-\ntools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c:8:void test_map_lookup_percpu_elem(void)\ntools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c-9-{\ntools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c:10:\tstruct test_map_lookup_percpu_elem *skel;\ntools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c-11-\tbool *possible = NULL;\n--\ntools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c-37-\ntools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c:38:\tskel = test_map_lookup_percpu_elem__open();\ntools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c:39:\tif (!ASSERT_OK_PTR(skel, \"test_map_lookup_percpu_elem__open\"))\ntools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c-40-\t\tgoto exit;\n--\ntools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c-44-\ntools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c:45:\tret = test_map_lookup_percpu_elem__load(skel);\ntools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c:46:\tif (!ASSERT_OK(ret, \"test_map_lookup_percpu_elem__load\"))\ntools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c-47-\t\tgoto cleanup;\ntools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c-48-\ntools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c:49:\tret = test_map_lookup_percpu_elem__attach(skel);\ntools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c:50:\tif (!ASSERT_OK(ret, \"test_map_lookup_percpu_elem__attach\"))\ntools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c-51-\t\tgoto cleanup;\n--\ntools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c-63-\ntools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c:64:\ttest_map_lookup_percpu_elem__detach(skel);\ntools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c-65-\n--\ntools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c-70-cleanup:\ntools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c:71:\ttest_map_lookup_percpu_elem__destroy(skel);\ntools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c-72-exit:\n--\ntools/testing/selftests/bpf/progs/cgroup_hierarchical_stats.c=84=int BPF_PROG(flusher, struct cgroup *cgrp, struct cgroup *parent, int cpu)\n--\ntools/testing/selftests/bpf/progs/cgroup_hierarchical_stats.c-93-\t/* Add CPU changes on this level since the last flush */\ntools/testing/selftests/bpf/progs/cgroup_hierarchical_stats.c:94:\tpcpu_counter = bpf_map_lookup_percpu_elem(\u0026percpu_attach_counters,\ntools/testing/selftests/bpf/progs/cgroup_hierarchical_stats.c-95-\t\t\t\t\t\t  \u0026cg_id, cpu);\n--\ntools/testing/selftests/bpf/progs/map_kptr.c=372=int test_map_kptr_ref_post(struct map_value *v)\n--\ntools/testing/selftests/bpf/progs/map_kptr.c-407-#define TEST_PCPU(map)                                 \\\ntools/testing/selftests/bpf/progs/map_kptr.c:408:\tv = bpf_map_lookup_percpu_elem(\u0026map, \u0026key, 0); \\\ntools/testing/selftests/bpf/progs/map_kptr.c-409-\tif (!v)                                        \\\n--\ntools/testing/selftests/bpf/progs/map_kptr.c=416=int test_map_kptr_ref1(struct __sk_buff *ctx)\n--\ntools/testing/selftests/bpf/progs/map_kptr.c-453-#define TEST_PCPU(map)                                 \\\ntools/testing/selftests/bpf/progs/map_kptr.c:454:\tv = bpf_map_lookup_percpu_elem(\u0026map, \u0026key, 0); \\\ntools/testing/selftests/bpf/progs/map_kptr.c-455-\tif (!v)                                        \\\n--\ntools/testing/selftests/bpf/progs/map_kptr_race.c=89=int test_percpu_htab_leak(struct __sk_buff *skb)\n--\ntools/testing/selftests/bpf/progs/map_kptr_race.c-99-\tfor (int i = 0; i \u003c nr_cpus; i++) {\ntools/testing/selftests/bpf/progs/map_kptr_race.c:100:\t\tv = bpf_map_lookup_percpu_elem(\u0026race_percpu_hash_map, \u0026key, i);\ntools/testing/selftests/bpf/progs/map_kptr_race.c-101-\t\tif (!v)\n--\ntools/testing/selftests/bpf/progs/refcounted_kptr.c=1034=int percpu_hash_refcount_leak(void *ctx)\n--\ntools/testing/selftests/bpf/progs/refcounted_kptr.c-1038-\ntools/testing/selftests/bpf/progs/refcounted_kptr.c:1039:\tv = bpf_map_lookup_percpu_elem(\u0026percpu_hash, \u0026key, 0);\ntools/testing/selftests/bpf/progs/refcounted_kptr.c-1040-\tif (!v)\n--\ntools/testing/selftests/bpf/progs/refcounted_kptr.c=1047=int clear_percpu_hash_kptr(void *ctx)\n--\ntools/testing/selftests/bpf/progs/refcounted_kptr.c-1052-\ntools/testing/selftests/bpf/progs/refcounted_kptr.c:1053:\tv = bpf_map_lookup_percpu_elem(\u0026percpu_hash, \u0026key, 0);\ntools/testing/selftests/bpf/progs/refcounted_kptr.c-1054-\tif (!v)\n--\ntools/testing/selftests/bpf/progs/test_map_lookup_percpu_elem.c=39=static int read_percpu_elem_callback(__u32 index, struct read_percpu_elem_ctx *ctx)\n--\ntools/testing/selftests/bpf/progs/test_map_lookup_percpu_elem.c-43-\ntools/testing/selftests/bpf/progs/test_map_lookup_percpu_elem.c:44:\tvalue = bpf_map_lookup_percpu_elem(ctx-\u003emap, \u0026key, index);\ntools/testing/selftests/bpf/progs/test_map_lookup_percpu_elem.c-45-\tif (value)\n"
}

gemini-3.7-flash

null

null

							input: 9470
							output: 67
							thoughts: 56
						

Okay, here's my assessment of this situation:

**WorthFuzzing Decision**

Alright, I've got this patch in front of me. After a quick look, it's clear the changes are *only* touching the test suite within `tools/testing/selftests/bpf/`. There's absolutely nothing here that touches core kernel source code, right? So, based on my understanding of how `WorthFuzzing` is determined, the answer is pretty straightforward. Given that there's no alteration to the kernel itself, the fuzzing potential here is effectively zero. `WorthFuzzing` absolutely has to be `false` in this case. No point wasting cycles on something that won't give us any valuable insights into kernel stability or security. Time to call `set-results` and move on.

{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies BPF selftests in tools/testing/selftests/bpf/ and does not make functional changes to the Linux kernel runtime or core subsystems.",
  "WorthFuzzing": false
}

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies BPF selftests in tools/testing/selftests/bpf/ and does not make functional changes to the Linux kernel runtime or core subsystems.",
  "WorthFuzzing": false
}

{
  "WorthFuzzing": false
}

null