| Seq | Timestamp | Type | Name | Duration |
|---|---|---|---|---|
| 0/0 | 2026/09/20 07:56 | flow | patch-triage |
0mArgs:null Results: {
"EnableConfigs": null,
"FocusSymbols": [],
"KMSANReasoning": "",
"NeedsKMSAN": false,
"Reasoning": "The patch solely modifies user-space code and tests under tools/ (bpftool and BPF selftests). It does not alter the compiled kernel image (vmlinux) or any kernel modules, and thus does not affect kernel execution or warrant fuzzing.",
"WorthFuzzing": false
} |
| 1/1 | 2026/09/20 07:56 | action | read-patch-diff |
0mArgs:null Results: {
"PatchDiff": "commit 26de69eed4f8567ae984e1a697901be76361291d\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Sun Sep 20 07:56:15 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/tools/bpf/bpftool/Documentation/bpftool-gen.rst b/tools/bpf/bpftool/Documentation/bpftool-gen.rst\nindex d0a36f442db72..1cdecf3e4fa57 100644\n--- a/tools/bpf/bpftool/Documentation/bpftool-gen.rst\n+++ b/tools/bpf/bpftool/Documentation/bpftool-gen.rst\n@@ -184,7 +184,9 @@ OPTIONS\n -L, --use-loader\n For skeletons, generate a \"light\" skeleton (also known as \"loader\"\n skeleton). A light skeleton contains a loader eBPF program. It does not use\n- the majority of the libbpf infrastructure, and does not need libelf.\n+ the majority of the libbpf infrastructure, and does not need libelf. BPF\n+ programs marked as non-autoload (e.g., via **SEC(\"?...\")**) are skipped and\n+ not included in the generated skeleton.\n \n -S, --sign\n For skeletons, generate a signed skeleton. This option must be used with\ndiff --git a/tools/bpf/bpftool/gen.c b/tools/bpf/bpftool/gen.c\nindex a50540ef6521c..b275373b37816 100644\n--- a/tools/bpf/bpftool/gen.c\n+++ b/tools/bpf/bpftool/gen.c\n@@ -583,6 +583,9 @@ static void codegen_attach_detach(struct bpf_object *obj, const char *obj_name)\n \tbpf_object__for_each_program(prog, obj) {\n \t\tconst char *tp_name;\n \n+\t\tif (!bpf_program__autoload(prog))\n+\t\t\tcontinue;\n+\n \t\tcodegen(\"\\\n \t\t\t\\n\\\n \t\t\t\\n\\\n@@ -629,6 +632,8 @@ static void codegen_attach_detach(struct bpf_object *obj, const char *obj_name)\n \t\t\", obj_name);\n \n \tbpf_object__for_each_program(prog, obj) {\n+\t\tif (!bpf_program__autoload(prog))\n+\t\t\tcontinue;\n \t\tcodegen(\"\\\n \t\t\t\\n\\\n \t\t\t\tret = ret \u003c 0 ? ret : %1$s__%2$s__attach(skel); \\n\\\n@@ -646,6 +651,8 @@ static void codegen_attach_detach(struct bpf_object *obj, const char *obj_name)\n \t\t\", obj_name);\n \n \tbpf_object__for_each_program(prog, obj) {\n+\t\tif (!bpf_program__autoload(prog))\n+\t\t\tcontinue;\n \t\tcodegen(\"\\\n \t\t\t\\n\\\n \t\t\t\tskel_closenz(skel-\u003elinks.%1$s_fd);\t \\n\\\n@@ -676,6 +683,8 @@ static void codegen_destroy(struct bpf_object *obj, const char *obj_name)\n \t\tobj_name);\n \n \tbpf_object__for_each_program(prog, obj) {\n+\t\tif (!bpf_program__autoload(prog))\n+\t\t\tcontinue;\n \t\tcodegen(\"\\\n \t\t\t\\n\\\n \t\t\t\tskel_closenz(skel-\u003eprogs.%1$s.prog_fd);\t \\n\\\n@@ -701,9 +710,9 @@ static void codegen_destroy(struct bpf_object *obj, const char *obj_name)\n \t\tobj_name);\n }\n \n-static int gen_trace(struct bpf_object *obj, const char *obj_name, const char *header_guard)\n+static int gen_trace(struct bpf_object *obj, const char *obj_name, const char *header_guard,\n+\t\t const struct gen_loader_opts *opts, size_t prog_cnt, size_t map_cnt)\n {\n-\tDECLARE_LIBBPF_OPTS(gen_loader_opts, opts);\n \tstruct bpf_load_and_run_opts sopts = {};\n \tchar sig_buf[MAX_SIG_SIZE];\n \t__u8 prog_sha[SHA256_DIGEST_LENGTH];\n@@ -712,23 +721,6 @@ static int gen_trace(struct bpf_object *obj, const char *obj_name, const char *h\n \tchar ident[256];\n \tint err = 0;\n \n-\tif (sign_progs)\n-\t\topts.gen_hash = true;\n-\n-\terr = bpf_object__gen_loader(obj, \u0026opts);\n-\tif (err)\n-\t\treturn err;\n-\n-\terr = bpf_object__load(obj);\n-\tif (err) {\n-\t\tp_err(\"failed to load object file\");\n-\t\tgoto out;\n-\t}\n-\n-\t/* If there was no error during load then gen_loader_opts\n-\t * are populated with the loader program.\n-\t */\n-\n \t/* finish generating 'struct skel' */\n \tcodegen(\"\\\n \t\t\\n\\\n@@ -750,9 +742,16 @@ static int gen_trace(struct bpf_object *obj, const char *obj_name, const char *h\n \t\t\tskel = (struct %1$s *)skel_alloc(sizeof(*skel)); \\n\\\n \t\t\tif (!skel)\t\t\t\t\t \\n\\\n \t\t\t\tgoto cleanup;\t\t\t\t \\n\\\n-\t\t\tskel-\u003ectx.sz = (char *)\u0026skel-\u003elinks - (char *)skel; \\n\\\n \t\t\",\n-\t\tobj_name, opts.data_sz);\n+\t\tobj_name);\n+\tif (prog_cnt)\n+\t\tprintf(\"\\tskel-\u003ectx.sz = (char *)\u0026skel-\u003eprogs - (char *)skel\\n\"\n+\t\t \"\\t\\t + sizeof(skel-\u003eprogs);\\n\");\n+\telse if (map_cnt)\n+\t\tprintf(\"\\tskel-\u003ectx.sz = (char *)\u0026skel-\u003emaps - (char *)skel\\n\"\n+\t\t \"\\t\\t + sizeof(skel-\u003emaps);\\n\");\n+\telse\n+\t\tprintf(\"\\tskel-\u003ectx.sz = sizeof(skel-\u003ectx);\\n\");\n \tbpf_object__for_each_map(map, obj) {\n \t\tconst void *mmap_data = NULL;\n \t\tsize_t mmap_size = 0;\n@@ -795,22 +794,22 @@ static int gen_trace(struct bpf_object *obj, const char *obj_name, const char *h\n \t\t\tstatic const char opts_data[] __attribute__((__aligned__(8))) = \\\"\\\\\\n\\\n \t\t\",\n \t\tobj_name);\n-\tprint_hex(opts.data, opts.data_sz);\n+\tprint_hex(opts-\u003edata, opts-\u003edata_sz);\n \tcodegen(\"\\\n \t\t\\n\\\n \t\t\\\";\t\t\t\t\t\t\t \\n\\\n \t\t\tstatic const char opts_insn[] __attribute__((__aligned__(8))) = \\\"\\\\\\n\\\n \t\t\");\n-\tprint_hex(opts.insns, opts.insns_sz);\n+\tprint_hex(opts-\u003einsns, opts-\u003einsns_sz);\n \tcodegen(\"\\\n \t\t\\n\\\n \t\t\\\";\\n\");\n \n \tif (sign_progs) {\n-\t\tsopts.insns = opts.insns;\n-\t\tsopts.insns_sz = opts.insns_sz;\n-\t\tsopts.data = opts.data;\n-\t\tsopts.data_sz = opts.data_sz;\n+\t\tsopts.insns = opts-\u003einsns;\n+\t\tsopts.insns_sz = opts-\u003einsns_sz;\n+\t\tsopts.data = opts-\u003edata;\n+\t\tsopts.data_sz = opts-\u003edata_sz;\n \t\tsopts.excl_prog_hash = prog_sha;\n \t\tsopts.excl_prog_hash_sz = sizeof(prog_sha);\n \t\tsopts.signature = sig_buf;\n@@ -1250,6 +1249,7 @@ static int do_skeleton(int argc, char **argv)\n \tchar header_guard[MAX_OBJ_NAME_LEN + sizeof(\"__SKEL_H__\")];\n \tsize_t map_cnt = 0, prog_cnt = 0, attach_map_cnt = 0, file_sz, mmap_sz;\n \tDECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts);\n+\tDECLARE_LIBBPF_OPTS(gen_loader_opts, gen_opts);\n \tchar obj_name[MAX_OBJ_NAME_LEN] = \"\", *obj_data;\n \tstruct bpf_object *obj = NULL;\n \tconst char *file;\n@@ -1326,6 +1326,29 @@ static int do_skeleton(int argc, char **argv)\n \t\tgoto out_obj;\n \t}\n \n+\t/* If we are generating a loader, load the object early (before\n+\t * counting programs and emitting skeleton struct definitions), as\n+\t * bpf_object__load() may disable (i.e., autoload=false) some programs\n+\t * if their requirements are not met.\n+\t */\n+\tif (use_loader) {\n+\t\tif (sign_progs)\n+\t\t\tgen_opts.gen_hash = true;\n+\n+\t\terr = bpf_object__gen_loader(obj, \u0026gen_opts);\n+\t\tif (err)\n+\t\t\tgoto out;\n+\n+\t\terr = bpf_object__load(obj);\n+\t\tif (err) {\n+\t\t\tp_err(\"failed to load object file\");\n+\t\t\tgoto out;\n+\t\t}\n+\t\t/* If there was no error during load, gen_opts is populated with\n+\t\t * the loader program.\n+\t\t */\n+\t}\n+\n \tbpf_object__for_each_map(map, obj) {\n \t\tif (!get_map_ident(map, ident, sizeof(ident))) {\n \t\t\tp_err(\"ignoring unrecognized internal map '%s'...\",\n@@ -1339,6 +1362,8 @@ static int do_skeleton(int argc, char **argv)\n \t\tmap_cnt++;\n \t}\n \tbpf_object__for_each_program(prog, obj) {\n+\t\tif (use_loader \u0026\u0026 !bpf_program__autoload(prog))\n+\t\t\tcontinue;\n \t\tprog_cnt++;\n \t}\n \n@@ -1402,6 +1427,8 @@ static int do_skeleton(int argc, char **argv)\n \tif (prog_cnt) {\n \t\tprintf(\"\\tstruct {\\n\");\n \t\tbpf_object__for_each_program(prog, obj) {\n+\t\t\tif (use_loader \u0026\u0026 !bpf_program__autoload(prog))\n+\t\t\t\tcontinue;\n \t\t\tif (use_loader)\n \t\t\t\tprintf(\"\\t\\tstruct bpf_prog_desc %s;\\n\",\n \t\t\t\t bpf_program__name(prog));\n@@ -1415,6 +1442,8 @@ static int do_skeleton(int argc, char **argv)\n \tif (prog_cnt + attach_map_cnt) {\n \t\tprintf(\"\\tstruct {\\n\");\n \t\tbpf_object__for_each_program(prog, obj) {\n+\t\t\tif (use_loader \u0026\u0026 !bpf_program__autoload(prog))\n+\t\t\t\tcontinue;\n \t\t\tif (use_loader)\n \t\t\t\tprintf(\"\\t\\tint %s_fd;\\n\",\n \t\t\t\t bpf_program__name(prog));\n@@ -1451,7 +1480,7 @@ static int do_skeleton(int argc, char **argv)\n \t\t\tgoto out;\n \t}\n \tif (use_loader) {\n-\t\terr = gen_trace(obj, obj_name, header_guard);\n+\t\terr = gen_trace(obj, obj_name, header_guard, \u0026gen_opts, prog_cnt, map_cnt);\n \t\tgoto out;\n \t}\n \ndiff --git a/tools/testing/selftests/bpf/prog_tests/global_data_init.c b/tools/testing/selftests/bpf/prog_tests/global_data_init.c\nindex 7c539cbcf3a1e..797590127787b 100644\n--- a/tools/testing/selftests/bpf/prog_tests/global_data_init.c\n+++ b/tools/testing/selftests/bpf/prog_tests/global_data_init.c\n@@ -375,15 +375,43 @@ static void test_global_percpu_data_verifier_log(void)\n \tRUN_TESTS(test_global_percpu_data);\n }\n \n-static void test_global_percpu_data_iter(void)\n+static void test_global_percpu_data_iter_fd(int prog_fd, int map_fd, int num_cpus,\n+\t\t\t\t\t bool *run_iter, __u32 *sum)\n {\n-\tDECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, opts);\n-\tstruct test_global_percpu_data *skel;\n+\tDECLARE_LIBBPF_OPTS(bpf_link_create_opts, opts);\n \tunion bpf_iter_link_info linfo = {};\n-\tstruct bpf_link *link = NULL;\n-\tint fd, num_cpus, len, err;\n+\tint link_fd, iter_fd, len;\n \tchar buf[16];\n \n+\tlinfo.map.map_fd = map_fd;\n+\topts.iter_info = \u0026linfo;\n+\topts.iter_info_len = sizeof(linfo);\n+\n+\tlink_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_ITER, \u0026opts);\n+\tif (!ASSERT_GE(link_fd, 0, \"bpf_link_create\"))\n+\t\treturn;\n+\n+\titer_fd = bpf_iter_create(link_fd);\n+\tif (!ASSERT_GE(iter_fd, 0, \"bpf_iter_create\"))\n+\t\tgoto out;\n+\n+\twhile ((len = read(iter_fd, buf, sizeof(buf))) \u003e 0) {\n+\t\t/* no-op */\n+\t}\n+\tASSERT_EQ(len, 0, \"read iter\");\n+\tASSERT_TRUE(*run_iter, \"run_iter\");\n+\tASSERT_EQ(*sum, 0xc0de * num_cpus, \"sum\");\n+\n+\tclose(iter_fd);\n+out:\n+\tclose(link_fd);\n+}\n+\n+static void test_global_percpu_data_iter(void)\n+{\n+\tstruct test_global_percpu_data *skel;\n+\tint num_cpus, err;\n+\n \tnum_cpus = libbpf_num_possible_cpus();\n \tif (!ASSERT_GT(num_cpus, 0, \"libbpf_num_possible_cpus\"))\n \t\treturn;\n@@ -395,34 +423,50 @@ static void test_global_percpu_data_iter(void)\n \tskel-\u003erodata-\u003enum_cpus = num_cpus;\n \tskel-\u003erodata-\u003enum_off = offsetof(struct test_global_percpu_data__percpu,\n \t\t\t\t\t struct_data.nums[6]);\n-\tskel-\u003erodata-\u003eelem_sz = roundup(sizeof(struct test_global_percpu_data__percpu), 8);\n+\tskel-\u003erodata-\u003eelem_sz = roundup(sizeof(*skel-\u003epercpu), 8);\n \tskel-\u003epercpu-\u003estruct_data.nums[6] = 0xc0de;\n \n \terr = test_global_percpu_data__load(skel);\n \tif (!ASSERT_OK(err, \"test_global_percpu_data__load\"))\n \t\tgoto out;\n \n-\tlinfo.map.map_fd = bpf_map__fd(skel-\u003emaps.percpu);\n-\topts.link_info = \u0026linfo;\n-\topts.link_info_len = sizeof(linfo);\n-\tlink = bpf_program__attach_iter(skel-\u003eprogs.dump_percpu_data, \u0026opts);\n-\tif (!ASSERT_OK_PTR(link, \"bpf_program__attach_iter\"))\n-\t\tgoto out;\n+\ttest_global_percpu_data_iter_fd(bpf_program__fd(skel-\u003eprogs.dump_percpu_data),\n+\t\t\t\t\tbpf_map__fd(skel-\u003emaps.percpu),\n+\t\t\t\t\tnum_cpus, \u0026skel-\u003ebss-\u003erun_iter,\n+\t\t\t\t\t\u0026skel-\u003ebss-\u003esum);\n+out:\n+\ttest_global_percpu_data__destroy(skel);\n+}\n \n-\tfd = bpf_iter_create(bpf_link__fd(link));\n-\tif (!ASSERT_GE(fd, 0, \"bpf_iter_create\"))\n-\t\tgoto out;\n+static void test_global_percpu_data_iter_lskel(void)\n+{\n+\tstruct test_global_percpu_data_lskel *skel;\n+\tint num_cpus, err;\n \n-\twhile ((len = read(fd, buf, sizeof(buf))) \u003e 0)\n-\t\tdo { } while (0);\n-\tASSERT_EQ(len, 0, \"read iter\");\n-\tASSERT_TRUE(skel-\u003ebss-\u003erun_iter, \"run_iter\");\n-\tASSERT_EQ(skel-\u003ebss-\u003esum, 0xc0de * num_cpus, \"sum\");\n+\tnum_cpus = libbpf_num_possible_cpus();\n+\tif (!ASSERT_GT(num_cpus, 0, \"libbpf_num_possible_cpus\"))\n+\t\treturn;\n \n-\tclose(fd);\n+\tskel = test_global_percpu_data_lskel__open();\n+\tif (!ASSERT_OK_PTR(skel, \"test_global_percpu_data_lskel__open\"))\n+\t\treturn;\n+\n+\tskel-\u003erodata-\u003enum_cpus = num_cpus;\n+\tskel-\u003erodata-\u003enum_off = offsetof(struct test_global_percpu_data_lskel__percpu,\n+\t\t\t\t\t struct_data.nums[6]);\n+\tskel-\u003erodata-\u003eelem_sz = roundup(sizeof(*skel-\u003epercpu), 8);\n+\tskel-\u003epercpu-\u003estruct_data.nums[6] = 0xc0de;\n+\n+\terr = test_global_percpu_data_lskel__load(skel);\n+\tif (!ASSERT_OK(err, \"test_global_percpu_data_lskel__load\"))\n+\t\tgoto out;\n+\n+\ttest_global_percpu_data_iter_fd(skel-\u003eprogs.dump_percpu_data.prog_fd,\n+\t\t\t\t\tskel-\u003emaps.percpu.map_fd,\n+\t\t\t\t\tnum_cpus, \u0026skel-\u003ebss-\u003erun_iter,\n+\t\t\t\t\t\u0026skel-\u003ebss-\u003esum);\n out:\n-\tbpf_link__destroy(link);\n-\ttest_global_percpu_data__destroy(skel);\n+\ttest_global_percpu_data_lskel__destroy(skel);\n }\n \n void test_global_percpu_data(void)\n@@ -445,4 +489,6 @@ void test_global_percpu_data(void)\n \ttest_global_percpu_data_verifier_log();\n \tif (test__start_subtest(\"iter\"))\n \t\ttest_global_percpu_data_iter();\n+\tif (test__start_subtest(\"iter_lskel\"))\n+\t\ttest_global_percpu_data_iter_lskel();\n }\n"
} |
| 2/1 | 2026/09/20 07:56 | agent | patch-evaluator |
0mModel:core Args: null Results: {
"EnableConfigs": null,
"FocusSymbols": [],
"Reasoning": "The patch solely modifies user-space code and tests under tools/ (bpftool and BPF selftests). It does not alter the compiled kernel image (vmlinux) or any kernel modules, and thus does not affect kernel execution or warrant fuzzing.",
"WorthFuzzing": false
}Instruction: You are an expert Linux kernel maintainer and security engineer.
Your job is to review a provided patch series and evaluate whether it warrants fuzzing with syzkaller.
IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on internal assumptions. You must actively use your code access
tools to inspect the actual source code, callers, and surrounding context.
================================================================================
1. CORE TRIAGE PHILOSOPHY
================================================================================
The goal of patch fuzzing is to discover crashes, regressions, exposed latent bugs,
and newly triggered assertions introduced by the patch series.
- REACHABILITY IS THE PRIMARY GATE:
Fuzzing can only discover bugs in code that can actually execute in standard virtualized
environments (GCE or QEMU, utilizing software-emulated devices like USB gadgets, netdev, tun/tap).
If the modified code is structurally unreachable (see Section 2), it MUST NOT be fuzzed,
regardless of whether it adds assertions or complex logic.
- DO NOT BLINDLY TRUST "NO FUNCTIONAL CHANGE" (NFCI) OR "REFACTORING" CLAIMS:
Patch authors routinely label changes as "cleanups", "refactorings", or state
"No functional change intended". Do NOT take these claims at face value.
Code refactorings that rearrange logic, introduce helper functions, or alter state management
in core subsystems frequently introduce subtle semantic shifts or uncover latent kernel bugs.
If reachable executable code is modified or refactored, it MUST be fuzzed.
- NEW OR MODIFIED ASSERTIONS IN REACHABLE CODE MUST BE FUZZED:
When a patch introduces or modifies runtime checks or assertions (e.g., WARN_ON*, VM_WARN_ON*,
BUG_ON*, lockdep_assert*) in reachable code paths, it enforces new or stricter invariants.
Even if the author believes the invariant always holds, fuzzing is essential to verify whether
an unusual sequence of operations can violate it.
================================================================================
2. WHEN TO RETURN WorthFuzzing=false (NEGATIVE CRITERIA)
================================================================================
Return WorthFuzzing=false ONLY IF all modified code falls strictly into one or more of these categories:
- Non-kernel and non-executable changes:
* Modifications to Documentation/, comments, or spelling fixes.
* User-space directories, self-tests, samples, or scripts (e.g., tools/, samples/, scripts/, usr/)
that do not affect the compiled kernel image (vmlinux) or kernel modules.
* Purely decorative logging (e.g., message strings in pr_err, printk, dev_info) or tracepoints
that do not alter control flow or data structures.
* Build system or Kconfig changes that do not alter compiled C logic.
- Structurally unreachable hardware:
* Vendor-specific PCIe switches, SmartNICs, or GPU drivers (e.g., mlxsw, pds_core, qed,
ionic, amdgpu) requiring physical ASIC/PCIe cards not emulated in standard QEMU.
- Unreachable execution paths:
* Driver teardown callbacks (.remove, .shutdown, pci_unregister_driver) executed only during
physical PCI hot-unplug or manual sysfs driver unbinding.
* Code paths exclusive to architectures other than the target architecture.
================================================================================
3. WHEN TO RETURN WorthFuzzing=true (POSITIVE CRITERIA)
================================================================================
Return WorthFuzzing=true whenever the patch touches reachable executable code, including:
- Core Subsystems:
* Any logic modifications in memory management (mm/), synchronization/locking (kernel/locking/),
BPF, scheduler, core networking, VFS, or syscall handling.
- Refactorings and Code Cleanups:
* Any restructuring of reachable data structures, helper abstractions, or algorithm flows.
- Runtime Assertions and Defensive Checks:
* Any introduction or alteration of assertions (WARN_ON*, VM_WARN_ON*, BUG_ON*, etc.) in reachable paths.
- Reachable Drivers and Protocols:
* Drivers accessible via virtual buses (virtio, USB gadget, loopback, netlink, binder, sockets, etc.).
================================================================================
4. EXTRACTING FocusSymbols (PREVENTING DILUTION)
================================================================================
When WorthFuzzing=true, you must extract specific kernel functions into FocusSymbols to guide the fuzzer:
- AVOID UBIQUITOUS LIFECYCLE HOT-PATHS:
Do NOT list generic, ubiquitous functions called by almost every program in the corpus
(including, but not limited to: general memory allocators and deallocators, page fault
and trap handlers, or core synchronization primitives; this is not an exhaustive list).
Listing ubiquitous functions causes the fuzzer to classify thousands of unrelated tests as "focused",
which severely dilutes fuzzing effort away from the actual changes.
- TARGET SPECIFIC FEATURE LOGIC AND ENTRYPOINTS:
List functions that specifically implement the logic being added or altered, or direct API entrypoints
for the subsystem feature under review.
- HANDLING STATIC INLINE FUNCTIONS IN HEADERS (.h):
Compiler-inlined static functions (such as static inlines in mm/*.h or include/linux/*.h) lack
distinct symbol addresses in vmlinux and cannot be targeted directly by symbol coverage filters.
If the changes are primarily in static inline helpers, identify non-static, feature-specific caller
functions in .c files that exercise them (avoiding ubiquitous lifecycle wrappers).
================================================================================
5. IDENTIFYING EnableConfigs
================================================================================
Identify any specific CONFIG_ options required to properly compile and reach the modified code:
- Inspect Kconfig files and #ifdef guards; do not make assumptions.
- Check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed.
- Strip any 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4").
Prefer calling several tools at the same time to save round-trips.
Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.
Prompt: Target architecture: amd64
For your convenience, here is the diff of the changes:
commit 26de69eed4f8567ae984e1a697901be76361291d
Author: syz-cluster <triage@syzkaller.com>
Date: Sun Sep 20 07:56:15 2026 +0000
syz-cluster: applied patch under review
diff --git a/tools/bpf/bpftool/Documentation/bpftool-gen.rst b/tools/bpf/bpftool/Documentation/bpftool-gen.rst
index d0a36f442db72..1cdecf3e4fa57 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-gen.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-gen.rst
@@ -184,7 +184,9 @@ OPTIONS
-L, --use-loader
For skeletons, generate a "light" skeleton (also known as "loader"
skeleton). A light skeleton contains a loader eBPF program. It does not use
- the majority of the libbpf infrastructure, and does not need libelf.
+ the majority of the libbpf infrastructure, and does not need libelf. BPF
+ programs marked as non-autoload (e.g., via **SEC("?...")**) are skipped and
+ not included in the generated skeleton.
-S, --sign
For skeletons, generate a signed skeleton. This option must be used with
diff --git a/tools/bpf/bpftool/gen.c b/tools/bpf/bpftool/gen.c
index a50540ef6521c..b275373b37816 100644
--- a/tools/bpf/bpftool/gen.c
+++ b/tools/bpf/bpftool/gen.c
@@ -583,6 +583,9 @@ static void codegen_attach_detach(struct bpf_object *obj, const char *obj_name)
bpf_object__for_each_program(prog, obj) {
const char *tp_name;
+ if (!bpf_program__autoload(prog))
+ continue;
+
codegen("\
\n\
\n\
@@ -629,6 +632,8 @@ static void codegen_attach_detach(struct bpf_object *obj, const char *obj_name)
", obj_name);
bpf_object__for_each_program(prog, obj) {
+ if (!bpf_program__autoload(prog))
+ continue;
codegen("\
\n\
ret = ret < 0 ? ret : %1$s__%2$s__attach(skel); \n\
@@ -646,6 +651,8 @@ static void codegen_attach_detach(struct bpf_object *obj, const char *obj_name)
", obj_name);
bpf_object__for_each_program(prog, obj) {
+ if (!bpf_program__autoload(prog))
+ continue;
codegen("\
\n\
skel_closenz(skel->links.%1$s_fd); \n\
@@ -676,6 +683,8 @@ static void codegen_destroy(struct bpf_object *obj, const char *obj_name)
obj_name);
bpf_object__for_each_program(prog, obj) {
+ if (!bpf_program__autoload(prog))
+ continue;
codegen("\
\n\
skel_closenz(skel->progs.%1$s.prog_fd); \n\
@@ -701,9 +710,9 @@ static void codegen_destroy(struct bpf_object *obj, const char *obj_name)
obj_name);
}
-static int gen_trace(struct bpf_object *obj, const char *obj_name, const char *header_guard)
+static int gen_trace(struct bpf_object *obj, const char *obj_name, const char *header_guard,
+ const struct gen_loader_opts *opts, size_t prog_cnt, size_t map_cnt)
{
- DECLARE_LIBBPF_OPTS(gen_loader_opts, opts);
struct bpf_load_and_run_opts sopts = {};
char sig_buf[MAX_SIG_SIZE];
__u8 prog_sha[SHA256_DIGEST_LENGTH];
@@ -712,23 +721,6 @@ static int gen_trace(struct bpf_object *obj, const char *obj_name, const char *h
char ident[256];
int err = 0;
- if (sign_progs)
- opts.gen_hash = true;
-
- err = bpf_object__gen_loader(obj, &opts);
- if (err)
- return err;
-
- err = bpf_object__load(obj);
- if (err) {
- p_err("failed to load object file");
- goto out;
- }
-
- /* If there was no error during load then gen_loader_opts
- * are populated with the loader program.
- */
-
/* finish generating 'struct skel' */
codegen("\
\n\
@@ -750,9 +742,16 @@ static int gen_trace(struct bpf_object *obj, const char *obj_name, const char *h
skel = (struct %1$s *)skel_alloc(sizeof(*skel)); \n\
if (!skel) \n\
goto cleanup; \n\
- skel->ctx.sz = (char *)&skel->links - (char *)skel; \n\
",
- obj_name, opts.data_sz);
+ obj_name);
+ if (prog_cnt)
+ printf("\tskel->ctx.sz = (char *)&skel->progs - (char *)skel\n"
+ "\t\t + sizeof(skel->progs);\n");
+ else if (map_cnt)
+ printf("\tskel->ctx.sz = (char *)&skel->maps - (char *)skel\n"
+ "\t\t + sizeof(skel->maps);\n");
+ else
+ printf("\tskel->ctx.sz = sizeof(skel->ctx);\n");
bpf_object__for_each_map(map, obj) {
const void *mmap_data = NULL;
size_t mmap_size = 0;
@@ -795,22 +794,22 @@ static int gen_trace(struct bpf_object *obj, const char *obj_name, const char *h
static const char opts_data[] __attribute__((__aligned__(8))) = \"\\\n\
",
obj_name);
- print_hex(opts.data, opts.data_sz);
+ print_hex(opts->data, opts->data_sz);
codegen("\
\n\
\"; \n\
static const char opts_insn[] __attribute__((__aligned__(8))) = \"\\\n\
");
- print_hex(opts.insns, opts.insns_sz);
+ print_hex(opts->insns, opts->insns_sz);
codegen("\
\n\
\";\n");
if (sign_progs) {
- sopts.insns = opts.insns;
- sopts.insns_sz = opts.insns_sz;
- sopts.data = opts.data;
- sopts.data_sz = opts.data_sz;
+ sopts.insns = opts->insns;
+ sopts.insns_sz = opts->insns_sz;
+ sopts.data = opts->data;
+ sopts.data_sz = opts->data_sz;
sopts.excl_prog_hash = prog_sha;
sopts.excl_prog_hash_sz = sizeof(prog_sha);
sopts.signature = sig_buf;
@@ -1250,6 +1249,7 @@ static int do_skeleton(int argc, char **argv)
char header_guard[MAX_OBJ_NAME_LEN + sizeof("__SKEL_H__")];
size_t map_cnt = 0, prog_cnt = 0, attach_map_cnt = 0, file_sz, mmap_sz;
DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts);
+ DECLARE_LIBBPF_OPTS(gen_loader_opts, gen_opts);
char obj_name[MAX_OBJ_NAME_LEN] = "", *obj_data;
struct bpf_object *obj = NULL;
const char *file;
@@ -1326,6 +1326,29 @@ static int do_skeleton(int argc, char **argv)
goto out_obj;
}
+ /* If we are generating a loader, load the object early (before
+ * counting programs and emitting skeleton struct definitions), as
+ * bpf_object__load() may disable (i.e., autoload=false) some programs
+ * if their requirements are not met.
+ */
+ if (use_loader) {
+ if (sign_progs)
+ gen_opts.gen_hash = true;
+
+ err = bpf_object__gen_loader(obj, &gen_opts);
+ if (err)
+ goto out;
+
+ err = bpf_object__load(obj);
+ if (err) {
+ p_err("failed to load object file");
+ goto out;
+ }
+ /* If there was no error during load, gen_opts is populated with
+ * the loader program.
+ */
+ }
+
bpf_object__for_each_map(map, obj) {
if (!get_map_ident(map, ident, sizeof(ident))) {
p_err("ignoring unrecognized internal map '%s'...",
@@ -1339,6 +1362,8 @@ static int do_skeleton(int argc, char **argv)
map_cnt++;
}
bpf_object__for_each_program(prog, obj) {
+ if (use_loader && !bpf_program__autoload(prog))
+ continue;
prog_cnt++;
}
@@ -1402,6 +1427,8 @@ static int do_skeleton(int argc, char **argv)
if (prog_cnt) {
printf("\tstruct {\n");
bpf_object__for_each_program(prog, obj) {
+ if (use_loader && !bpf_program__autoload(prog))
+ continue;
if (use_loader)
printf("\t\tstruct bpf_prog_desc %s;\n",
bpf_program__name(prog));
@@ -1415,6 +1442,8 @@ static int do_skeleton(int argc, char **argv)
if (prog_cnt + attach_map_cnt) {
printf("\tstruct {\n");
bpf_object__for_each_program(prog, obj) {
+ if (use_loader && !bpf_program__autoload(prog))
+ continue;
if (use_loader)
printf("\t\tint %s_fd;\n",
bpf_program__name(prog));
@@ -1451,7 +1480,7 @@ static int do_skeleton(int argc, char **argv)
goto out;
}
if (use_loader) {
- err = gen_trace(obj, obj_name, header_guard);
+ err = gen_trace(obj, obj_name, header_guard, &gen_opts, prog_cnt, map_cnt);
goto out;
}
diff --git a/tools/testing/selftests/bpf/prog_tests/global_data_init.c b/tools/testing/selftests/bpf/prog_tests/global_data_init.c
index 7c539cbcf3a1e..797590127787b 100644
--- a/tools/testing/selftests/bpf/prog_tests/global_data_init.c
+++ b/tools/testing/selftests/bpf/prog_tests/global_data_init.c
@@ -375,15 +375,43 @@ static void test_global_percpu_data_verifier_log(void)
RUN_TESTS(test_global_percpu_data);
}
-static void test_global_percpu_data_iter(void)
+static void test_global_percpu_data_iter_fd(int prog_fd, int map_fd, int num_cpus,
+ bool *run_iter, __u32 *sum)
{
- DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, opts);
- struct test_global_percpu_data *skel;
+ DECLARE_LIBBPF_OPTS(bpf_link_create_opts, opts);
union bpf_iter_link_info linfo = {};
- struct bpf_link *link = NULL;
- int fd, num_cpus, len, err;
+ int link_fd, iter_fd, len;
char buf[16];
+ linfo.map.map_fd = map_fd;
+ opts.iter_info = &linfo;
+ opts.iter_info_len = sizeof(linfo);
+
+ link_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_ITER, &opts);
+ if (!ASSERT_GE(link_fd, 0, "bpf_link_create"))
+ return;
+
+ iter_fd = bpf_iter_create(link_fd);
+ if (!ASSERT_GE(iter_fd, 0, "bpf_iter_create"))
+ goto out;
+
+ while ((len = read(iter_fd, buf, sizeof(buf))) > 0) {
+ /* no-op */
+ }
+ ASSERT_EQ(len, 0, "read iter");
+ ASSERT_TRUE(*run_iter, "run_iter");
+ ASSERT_EQ(*sum, 0xc0de * num_cpus, "sum");
+
+ close(iter_fd);
+out:
+ close(link_fd);
+}
+
+static void test_global_percpu_data_iter(void)
+{
+ struct test_global_percpu_data *skel;
+ int num_cpus, err;
+
num_cpus = libbpf_num_possible_cpus();
if (!ASSERT_GT(num_cpus, 0, "libbpf_num_possible_cpus"))
return;
@@ -395,34 +423,50 @@ static void test_global_percpu_data_iter(void)
skel->rodata->num_cpus = num_cpus;
skel->rodata->num_off = offsetof(struct test_global_percpu_data__percpu,
struct_data.nums[6]);
- skel->rodata->elem_sz = roundup(sizeof(struct test_global_percpu_data__percpu), 8);
+ skel->rodata->elem_sz = roundup(sizeof(*skel->percpu), 8);
skel->percpu->struct_data.nums[6] = 0xc0de;
err = test_global_percpu_data__load(skel);
if (!ASSERT_OK(err, "test_global_percpu_data__load"))
goto out;
- linfo.map.map_fd = bpf_map__fd(skel->maps.percpu);
- opts.link_info = &linfo;
- opts.link_info_len = sizeof(linfo);
- link = bpf_program__attach_iter(skel->progs.dump_percpu_data, &opts);
- if (!ASSERT_OK_PTR(link, "bpf_program__attach_iter"))
- goto out;
+ test_global_percpu_data_iter_fd(bpf_program__fd(skel->progs.dump_percpu_data),
+ bpf_map__fd(skel->maps.percpu),
+ num_cpus, &skel->bss->run_iter,
+ &skel->bss->sum);
+out:
+ test_global_percpu_data__destroy(skel);
+}
- fd = bpf_iter_create(bpf_link__fd(link));
- if (!ASSERT_GE(fd, 0, "bpf_iter_create"))
- goto out;
+static void test_global_percpu_data_iter_lskel(void)
+{
+ struct test_global_percpu_data_lskel *skel;
+ int num_cpus, err;
- while ((len = read(fd, buf, sizeof(buf))) > 0)
- do { } while (0);
- ASSERT_EQ(len, 0, "read iter");
- ASSERT_TRUE(skel->bss->run_iter, "run_iter");
- ASSERT_EQ(skel->bss->sum, 0xc0de * num_cpus, "sum");
+ num_cpus = libbpf_num_possible_cpus();
+ if (!ASSERT_GT(num_cpus, 0, "libbpf_num_possible_cpus"))
+ return;
- close(fd);
+ skel = test_global_percpu_data_lskel__open();
+ if (!ASSERT_OK_PTR(skel, "test_global_percpu_data_lskel__open"))
+ return;
+
+ skel->rodata->num_cpus = num_cpus;
+ skel->rodata->num_off = offsetof(struct test_global_percpu_data_lskel__percpu,
+ struct_data.nums[6]);
+ skel->rodata->elem_sz = roundup(sizeof(*skel->percpu), 8);
+ skel->percpu->struct_data.nums[6] = 0xc0de;
+
+ err = test_global_percpu_data_lskel__load(skel);
+ if (!ASSERT_OK(err, "test_global_percpu_data_lskel__load"))
+ goto out;
+
+ test_global_percpu_data_iter_fd(skel->progs.dump_percpu_data.prog_fd,
+ skel->maps.percpu.map_fd,
+ num_cpus, &skel->bss->run_iter,
+ &skel->bss->sum);
out:
- bpf_link__destroy(link);
- test_global_percpu_data__destroy(skel);
+ test_global_percpu_data_lskel__destroy(skel);
}
void test_global_percpu_data(void)
@@ -445,4 +489,6 @@ void test_global_percpu_data(void)
test_global_percpu_data_verifier_log();
if (test__start_subtest("iter"))
test_global_percpu_data_iter();
+ if (test__start_subtest("iter_lskel"))
+ test_global_percpu_data_iter_lskel();
}
|
| 3/2 | 2026/09/20 07:56 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 7641 output: 85 thoughts: 1146 Thoughts: **Analysis of Patch Series for Syzkaller Fuzzing Suitability** Okay, let's break this down. My task is to determine if this patch series warrants fuzzing with syzkaller. First, I need to analyze the diff. Looking at the modified files, I see changes in `tools/bpf/bpftool/Documentation/bpftool-gen.rst`, `tools/bpf/bpftool/gen.c`, and `tools/testing/selftests/bpf/prog_tests/global_data_init.c`. The paths immediately jump out. `tools/bpf/bpftool/...` and `tools/testing/selftests/...` are both in userspace and, if I remember the rules correctly, that's a key factor. Now, let's consult the established criteria. I need to check the "negative criteria" - the conditions under which fuzzing is *not* recommended. The rule set specifies that fuzzing is not recommended if the changes fall strictly into specific categories. Let's see if this matches: The rules state I should return `WorthFuzzing=false` if all modified code is in 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. All the modified files are in the `tools/` directory. Specifically, `tools/bpf/bpftool/Documentation/bpftool-gen.rst`, `tools/bpf/bpftool/gen.c` and `tools/testing/selftests/bpf/prog_tests/global_data_init.c`. The `bpftool` directory is for userspace tools, and the `tools/testing/selftests` directory is for userspace selftests. Neither impact the kernel. I need to confirm there are *no* other changes beyond the provided diff. The prompt states the provided diff contains all modified files, so I can confirm my observation of the files: - `tools/bpf/bpftool/Documentation/bpftool-gen.rst` - `tools/bpf/bpftool/gen.c` - `tools/testing/selftests/bpf/prog_tests/global_data_init.c` Based on the paths, it seems clear the modified code is within `tools/`, and I can be confident it's *not* kernel code. The patch touches a userspace tool (`bpftool`) and userspace tests (selftests). Neither affects the kernel directly. Applying the criteria in Section 2, the changes fall squarely into the category "User-space directories, self-tests, samples, or scripts... that do not affect the compiled kernel image (vmlinux) or kernel modules." Therefore, my conclusion is `WorthFuzzing = false`. I'm confident in this, but let's double-check. Are any kernel headers or source files altered? No. Does `bpftool` get built *into* `vmlinux`? No, it's a standalone userspace utility. Does `global_data_init.c` get built into `vmlinux`? No, it's a selftest. Thus: * `WorthFuzzing`: false * `EnableConfigs`: \[ ] * `FocusSymbols`: \[ ] I'm ready to proceed with setting the results. |
| 4/2 | 2026/09/20 07:56 | tool | set-results |
0mArgs:{
"EnableConfigs": [],
"FocusSymbols": [],
"Reasoning": "The patch solely modifies user-space code and tests under tools/ (bpftool and BPF selftests). It does not alter the compiled kernel image (vmlinux) or any kernel modules, and thus does not affect kernel execution or warrant fuzzing.",
"WorthFuzzing": false
}Results: {
"EnableConfigs": null,
"FocusSymbols": [],
"Reasoning": "The patch solely modifies user-space code and tests under tools/ (bpftool and BPF selftests). It does not alter the compiled kernel image (vmlinux) or any kernel modules, and thus does not affect kernel execution or warrant fuzzing.",
"WorthFuzzing": false
} |
| 5/1 | 2026/09/20 07:56 | action | If |
0mArgs:{
"WorthFuzzing": false
}Results: null |
| Total Calls | Total Tokens | Avg Tokens | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|
| Total Calls | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|