AI Trajectory

null

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "KMSANReasoning": "",
  "NeedsKMSAN": false,
  "Reasoning": "The patch only modifies user-space selftest code in tools/testing/selftests/mm/pagemap_ioctl.c, which does not affect the compiled kernel image or kernel-space logic.",
  "WorthFuzzing": false
}

null

{
  "PatchDiff": "commit f886bb087cd29b046b65d4e88c4e47f4ac39503d\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Tue Sep 8 16:53:34 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/tools/testing/selftests/mm/pagemap_ioctl.c b/tools/testing/selftests/mm/pagemap_ioctl.c\nindex eadc7159ca5b9..d9a4fb782ecfe 100644\n--- a/tools/testing/selftests/mm/pagemap_ioctl.c\n+++ b/tools/testing/selftests/mm/pagemap_ioctl.c\n@@ -36,15 +36,15 @@\n \n #define TEST_ITERATIONS 100\n #define PAGEMAP \"/proc/self/pagemap\"\n-int pagemap_fd;\n-int uffd;\n-size_t page_size;\n-size_t hpage_size;\n-const char *progname;\n+static int pagemap_fd;\n+static int uffd;\n+static size_t page_size;\n+static size_t hpage_size;\n+static const char *progname;\n \n #define LEN(region)\t((region.end - region.start)/page_size)\n \n-static long pagemap_ioctl(void *start, int len, void *vec, int vec_len, int flag,\n+static long pagemap_ioctl(void *start, size_t len, void *vec, size_t vec_len, int flag,\n \t\t\t  int max_pages, long required_mask, long anyof_mask, long excluded_mask,\n \t\t\t  long return_mask)\n {\n@@ -65,7 +65,7 @@ static long pagemap_ioctl(void *start, int len, void *vec, int vec_len, int flag\n \treturn ioctl(pagemap_fd, PAGEMAP_SCAN, \u0026arg);\n }\n \n-static long pagemap_ioc(void *start, int len, void *vec, int vec_len, int flag,\n+static long pagemap_ioc(void *start, size_t len, void *vec, size_t vec_len, int flag,\n \t\t\tint max_pages, long required_mask, long anyof_mask, long excluded_mask,\n \t\t\tlong return_mask, long *walk_end)\n {\n@@ -92,8 +92,7 @@ static long pagemap_ioc(void *start, int len, void *vec, int vec_len, int flag,\n \treturn ret;\n }\n \n-\n-int init_uffd(void)\n+static int init_uffd(void)\n {\n \tstruct uffdio_api uffdio_api;\n \n@@ -116,7 +115,7 @@ int init_uffd(void)\n \treturn 0;\n }\n \n-int wp_init(void *addr, long size)\n+static int wp_init(void *addr, size_t size)\n {\n \tstruct uffdio_register uffdio_register;\n \tstruct uffdio_writeprotect wp;\n@@ -140,7 +139,7 @@ int wp_init(void *addr, long size)\n \treturn 0;\n }\n \n-int wp_free(void *addr, long size)\n+static int wp_free(void *addr, size_t size)\n {\n \tstruct uffdio_register uffdio_register;\n \n@@ -152,7 +151,7 @@ int wp_free(void *addr, long size)\n \treturn 0;\n }\n \n-int wp_addr_range(void *addr, int size)\n+static int wp_addr_range(void *addr, size_t size)\n {\n \tif (pagemap_ioctl(addr, size, NULL, 0,\n \t\t\t  PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,\n@@ -162,7 +161,7 @@ int wp_addr_range(void *addr, int size)\n \treturn 0;\n }\n \n-void *gethugetlb_mem(int size, int *shmid)\n+static void *gethugetlb_mem(size_t size, int *shmid)\n {\n \tchar *mem;\n \n@@ -186,9 +185,10 @@ void *gethugetlb_mem(int size, int *shmid)\n \treturn mem;\n }\n \n-int userfaultfd_tests(void)\n+static int userfaultfd_tests(void)\n {\n-\tlong mem_size, vec_size, written, num_pages = 16;\n+\tsize_t mem_size, vec_size, num_pages = 16;\n+\tlong written;\n \tchar *mem, *vec;\n \n \tmem_size = num_pages * page_size;\n@@ -229,9 +229,10 @@ int userfaultfd_tests(void)\n \treturn 0;\n }\n \n-int get_reads(struct page_region *vec, int vec_size)\n+static int get_reads(struct page_region *vec, size_t vec_size)\n {\n-\tint i, sum = 0;\n+\tsize_t i;\n+\tint sum = 0;\n \n \tfor (i = 0; i \u003c vec_size; i++)\n \t\tsum += LEN(vec[i]);\n@@ -239,9 +240,9 @@ int get_reads(struct page_region *vec, int vec_size)\n \treturn sum;\n }\n \n-int sanity_tests_sd(void)\n+static int sanity_tests_sd(void)\n {\n-\tunsigned long long mem_size, vec_size, i, total_pages = 0;\n+\tsize_t mem_size, vec_size, i, total_pages = 0;\n \tlong ret, ret2, ret3;\n \tint num_pages = 1000;\n \tint total_writes, total_reads, reads, count;\n@@ -331,7 +332,7 @@ int sanity_tests_sd(void)\n \tif (ret \u003c 0)\n \t\tksft_exit_fail_msg(\"error %ld %d %s\\n\", ret, errno, strerror(errno));\n \n-\tksft_test_result((unsigned long long)ret == mem_size/(page_size * 2),\n+\tksft_test_result((size_t)ret == mem_size/(page_size * 2),\n \t\t\t \"%s Repeated pattern of written and non-written pages\\n\", __func__);\n \n \t/* 4. Repeated pattern of written and non-written pages in parts */\n@@ -682,9 +683,9 @@ int sanity_tests_sd(void)\n \treturn 0;\n }\n \n-int base_tests(char *prefix, char *mem, unsigned long long mem_size, int skip)\n+static int base_tests(char *prefix, char *mem, size_t mem_size, int skip)\n {\n-\tunsigned long long vec_size;\n+\tsize_t vec_size;\n \tint written;\n \tstruct page_region *vec, *vec2;\n \n@@ -787,7 +788,7 @@ int base_tests(char *prefix, char *mem, unsigned long long mem_size, int skip)\n \treturn 0;\n }\n \n-void *gethugepage(int map_size)\n+static void *gethugepage(size_t map_size)\n {\n \tint ret;\n \tchar *map;\n@@ -805,13 +806,13 @@ void *gethugepage(int map_size)\n \treturn map;\n }\n \n-int hpage_unit_tests(void)\n+static int hpage_unit_tests(void)\n {\n \tchar *map;\n \tint ret, ret2;\n \tsize_t num_pages = 10;\n-\tunsigned long long map_size = hpage_size * num_pages;\n-\tunsigned long long vec_size = map_size/page_size;\n+\tsize_t map_size = hpage_size * num_pages;\n+\tsize_t vec_size = map_size/page_size;\n \tstruct page_region *vec, *vec2;\n \n \tvec = calloc(vec_size, sizeof(struct page_region));\n@@ -999,11 +1000,12 @@ int hpage_unit_tests(void)\n \treturn 0;\n }\n \n-int unmapped_region_tests(void)\n+static int unmapped_region_tests(void)\n {\n \tvoid *start = (void *)0x10000000;\n-\tint written, len = 0x00040000;\n-\tlong vec_size = len / page_size;\n+\tint written;\n+\tsize_t len = 0x00040000;\n+\tsize_t vec_size = len / page_size;\n \tstruct page_region *vec = calloc(vec_size, sizeof(struct page_region));\n \tif (!vec)\n \t\tksft_exit_fail_msg(\"error nomem\\n\");\n@@ -1072,7 +1074,7 @@ static void test_simple(void)\n  * with no page table, exercising pagemap_scan_pte_hole(); a base-page range\n  * leaves pte_none entries.\n  */\n-static void unpopulated_written_test(const char *name, char *mem, long size,\n+static void unpopulated_written_test(const char *name, char *mem, size_t size,\n \t\t\t\t     bool use_thp)\n {\n \tlong npages = size / page_size, fast = 0, slow = 0, ret;\n@@ -1115,7 +1117,7 @@ static void unpopulated_written_test(const char *name, char *mem, long size,\n \n static void unpopulated_scan_test(void)\n {\n-\tlong mem_size = 16 * page_size;\n+\tsize_t mem_size = 16 * page_size;\n \tchar *mem;\n \n \tmem = mmap(NULL, mem_size, PROT_READ | PROT_WRITE,\n@@ -1155,10 +1157,10 @@ static void unpopulated_thp_scan_test(void)\n \tmunmap(area, 2 * hpage_size);\n }\n \n-int sanity_tests(void)\n+static int sanity_tests(void)\n {\n-\tunsigned long long mem_size, vec_size;\n-\tlong ret, fd, i, buf_size, nr_pages;\n+\tsize_t mem_size, vec_size, i, buf_size;\n+\tlong ret, fd, nr_pages;\n \tstruct page_region *vec;\n \tchar *mem, *fmem;\n \tstruct stat sbuf;\n@@ -1327,7 +1329,7 @@ int sanity_tests(void)\n \treturn 0;\n }\n \n-int mprotect_tests(void)\n+static int mprotect_tests(void)\n {\n \tint ret;\n \tchar *mem, *mem2;\n@@ -1447,7 +1449,7 @@ static ssize_t get_dirty_pages_reset(char *mem, unsigned int count,\n \treturn cnt;\n }\n \n-void *thread_proc(void *mem)\n+static void *thread_proc(void *mem)\n {\n \tint *m = mem;\n \tlong curr_faults, faults;\n@@ -1487,7 +1489,7 @@ void *thread_proc(void *mem)\n \treturn NULL;\n }\n \n-static void transact_test(int page_size)\n+static void transact_test(void)\n {\n \tunsigned int i, count, extra_pages;\n \tunsigned int c;\n@@ -1580,11 +1582,11 @@ static void transact_test(int page_size)\n \t\t\t      extra_thread_faults);\n }\n \n-void zeropfn_tests(void)\n+static void zeropfn_tests(void)\n {\n-\tunsigned long long mem_size;\n+\tsize_t mem_size, i;\n \tstruct page_region vec;\n-\tint i, ret;\n+\tint ret;\n \tchar *mmap_mem, *mem;\n \n \t/* Test with normal memory */\n@@ -1642,8 +1644,8 @@ void zeropfn_tests(void)\n \n int main(int __attribute__((unused)) argc, char *argv[])\n {\n-\tint shmid, buf_size, fd, i, ret;\n-\tunsigned long long mem_size;\n+\tint shmid, fd, ret;\n+\tsize_t mem_size, buf_size, i;\n \tchar *mem, *map, *fmem;\n \tstruct stat sbuf;\n \n@@ -1651,6 +1653,9 @@ int main(int __attribute__((unused)) argc, char *argv[])\n \n \tksft_print_header();\n \n+\tpage_size = getpagesize();\n+\thpage_size = read_pmd_pagesize();\n+\n \tif (init_uffd())\n \t\tksft_exit_skip(\"Failed to initialize userfaultfd\\n\");\n \n@@ -1659,9 +1664,6 @@ int main(int __attribute__((unused)) argc, char *argv[])\n \n \tksft_set_plan(119);\n \n-\tpage_size = getpagesize();\n-\thpage_size = read_pmd_pagesize();\n-\n \tpagemap_fd = open(PAGEMAP, O_RDONLY);\n \tif (pagemap_fd \u003c 0)\n \t\tksft_exit_fail_msg(\"Failed to open \" PAGEMAP \"\\n\");\n@@ -1821,7 +1823,7 @@ int main(int __attribute__((unused)) argc, char *argv[])\n \tmprotect_tests();\n \n \t/* 13. Transact test */\n-\ttransact_test(page_size);\n+\ttransact_test();\n \n \t/* 14. Sanity testing */\n \tsanity_tests();\n"
}

core

null

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies user-space selftest code in tools/testing/selftests/mm/pagemap_ioctl.c, which does not affect the compiled kernel image or kernel-space logic.",
  "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 f886bb087cd29b046b65d4e88c4e47f4ac39503d
Author: syz-cluster <triage@syzkaller.com>
Date:   Tue Sep 8 16:53:34 2026 +0000

    syz-cluster: applied patch under review

diff --git a/tools/testing/selftests/mm/pagemap_ioctl.c b/tools/testing/selftests/mm/pagemap_ioctl.c
index eadc7159ca5b9..d9a4fb782ecfe 100644
--- a/tools/testing/selftests/mm/pagemap_ioctl.c
+++ b/tools/testing/selftests/mm/pagemap_ioctl.c
@@ -36,15 +36,15 @@
 
 #define TEST_ITERATIONS 100
 #define PAGEMAP "/proc/self/pagemap"
-int pagemap_fd;
-int uffd;
-size_t page_size;
-size_t hpage_size;
-const char *progname;
+static int pagemap_fd;
+static int uffd;
+static size_t page_size;
+static size_t hpage_size;
+static const char *progname;
 
 #define LEN(region)	((region.end - region.start)/page_size)
 
-static long pagemap_ioctl(void *start, int len, void *vec, int vec_len, int flag,
+static long pagemap_ioctl(void *start, size_t len, void *vec, size_t vec_len, int flag,
 			  int max_pages, long required_mask, long anyof_mask, long excluded_mask,
 			  long return_mask)
 {
@@ -65,7 +65,7 @@ static long pagemap_ioctl(void *start, int len, void *vec, int vec_len, int flag
 	return ioctl(pagemap_fd, PAGEMAP_SCAN, &arg);
 }
 
-static long pagemap_ioc(void *start, int len, void *vec, int vec_len, int flag,
+static long pagemap_ioc(void *start, size_t len, void *vec, size_t vec_len, int flag,
 			int max_pages, long required_mask, long anyof_mask, long excluded_mask,
 			long return_mask, long *walk_end)
 {
@@ -92,8 +92,7 @@ static long pagemap_ioc(void *start, int len, void *vec, int vec_len, int flag,
 	return ret;
 }
 
-
-int init_uffd(void)
+static int init_uffd(void)
 {
 	struct uffdio_api uffdio_api;
 
@@ -116,7 +115,7 @@ int init_uffd(void)
 	return 0;
 }
 
-int wp_init(void *addr, long size)
+static int wp_init(void *addr, size_t size)
 {
 	struct uffdio_register uffdio_register;
 	struct uffdio_writeprotect wp;
@@ -140,7 +139,7 @@ int wp_init(void *addr, long size)
 	return 0;
 }
 
-int wp_free(void *addr, long size)
+static int wp_free(void *addr, size_t size)
 {
 	struct uffdio_register uffdio_register;
 
@@ -152,7 +151,7 @@ int wp_free(void *addr, long size)
 	return 0;
 }
 
-int wp_addr_range(void *addr, int size)
+static int wp_addr_range(void *addr, size_t size)
 {
 	if (pagemap_ioctl(addr, size, NULL, 0,
 			  PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,
@@ -162,7 +161,7 @@ int wp_addr_range(void *addr, int size)
 	return 0;
 }
 
-void *gethugetlb_mem(int size, int *shmid)
+static void *gethugetlb_mem(size_t size, int *shmid)
 {
 	char *mem;
 
@@ -186,9 +185,10 @@ void *gethugetlb_mem(int size, int *shmid)
 	return mem;
 }
 
-int userfaultfd_tests(void)
+static int userfaultfd_tests(void)
 {
-	long mem_size, vec_size, written, num_pages = 16;
+	size_t mem_size, vec_size, num_pages = 16;
+	long written;
 	char *mem, *vec;
 
 	mem_size = num_pages * page_size;
@@ -229,9 +229,10 @@ int userfaultfd_tests(void)
 	return 0;
 }
 
-int get_reads(struct page_region *vec, int vec_size)
+static int get_reads(struct page_region *vec, size_t vec_size)
 {
-	int i, sum = 0;
+	size_t i;
+	int sum = 0;
 
 	for (i = 0; i < vec_size; i++)
 		sum += LEN(vec[i]);
@@ -239,9 +240,9 @@ int get_reads(struct page_region *vec, int vec_size)
 	return sum;
 }
 
-int sanity_tests_sd(void)
+static int sanity_tests_sd(void)
 {
-	unsigned long long mem_size, vec_size, i, total_pages = 0;
+	size_t mem_size, vec_size, i, total_pages = 0;
 	long ret, ret2, ret3;
 	int num_pages = 1000;
 	int total_writes, total_reads, reads, count;
@@ -331,7 +332,7 @@ int sanity_tests_sd(void)
 	if (ret < 0)
 		ksft_exit_fail_msg("error %ld %d %s\n", ret, errno, strerror(errno));
 
-	ksft_test_result((unsigned long long)ret == mem_size/(page_size * 2),
+	ksft_test_result((size_t)ret == mem_size/(page_size * 2),
 			 "%s Repeated pattern of written and non-written pages\n", __func__);
 
 	/* 4. Repeated pattern of written and non-written pages in parts */
@@ -682,9 +683,9 @@ int sanity_tests_sd(void)
 	return 0;
 }
 
-int base_tests(char *prefix, char *mem, unsigned long long mem_size, int skip)
+static int base_tests(char *prefix, char *mem, size_t mem_size, int skip)
 {
-	unsigned long long vec_size;
+	size_t vec_size;
 	int written;
 	struct page_region *vec, *vec2;
 
@@ -787,7 +788,7 @@ int base_tests(char *prefix, char *mem, unsigned long long mem_size, int skip)
 	return 0;
 }
 
-void *gethugepage(int map_size)
+static void *gethugepage(size_t map_size)
 {
 	int ret;
 	char *map;
@@ -805,13 +806,13 @@ void *gethugepage(int map_size)
 	return map;
 }
 
-int hpage_unit_tests(void)
+static int hpage_unit_tests(void)
 {
 	char *map;
 	int ret, ret2;
 	size_t num_pages = 10;
-	unsigned long long map_size = hpage_size * num_pages;
-	unsigned long long vec_size = map_size/page_size;
+	size_t map_size = hpage_size * num_pages;
+	size_t vec_size = map_size/page_size;
 	struct page_region *vec, *vec2;
 
 	vec = calloc(vec_size, sizeof(struct page_region));
@@ -999,11 +1000,12 @@ int hpage_unit_tests(void)
 	return 0;
 }
 
-int unmapped_region_tests(void)
+static int unmapped_region_tests(void)
 {
 	void *start = (void *)0x10000000;
-	int written, len = 0x00040000;
-	long vec_size = len / page_size;
+	int written;
+	size_t len = 0x00040000;
+	size_t vec_size = len / page_size;
 	struct page_region *vec = calloc(vec_size, sizeof(struct page_region));
 	if (!vec)
 		ksft_exit_fail_msg("error nomem\n");
@@ -1072,7 +1074,7 @@ static void test_simple(void)
  * with no page table, exercising pagemap_scan_pte_hole(); a base-page range
  * leaves pte_none entries.
  */
-static void unpopulated_written_test(const char *name, char *mem, long size,
+static void unpopulated_written_test(const char *name, char *mem, size_t size,
 				     bool use_thp)
 {
 	long npages = size / page_size, fast = 0, slow = 0, ret;
@@ -1115,7 +1117,7 @@ static void unpopulated_written_test(const char *name, char *mem, long size,
 
 static void unpopulated_scan_test(void)
 {
-	long mem_size = 16 * page_size;
+	size_t mem_size = 16 * page_size;
 	char *mem;
 
 	mem = mmap(NULL, mem_size, PROT_READ | PROT_WRITE,
@@ -1155,10 +1157,10 @@ static void unpopulated_thp_scan_test(void)
 	munmap(area, 2 * hpage_size);
 }
 
-int sanity_tests(void)
+static int sanity_tests(void)
 {
-	unsigned long long mem_size, vec_size;
-	long ret, fd, i, buf_size, nr_pages;
+	size_t mem_size, vec_size, i, buf_size;
+	long ret, fd, nr_pages;
 	struct page_region *vec;
 	char *mem, *fmem;
 	struct stat sbuf;
@@ -1327,7 +1329,7 @@ int sanity_tests(void)
 	return 0;
 }
 
-int mprotect_tests(void)
+static int mprotect_tests(void)
 {
 	int ret;
 	char *mem, *mem2;
@@ -1447,7 +1449,7 @@ static ssize_t get_dirty_pages_reset(char *mem, unsigned int count,
 	return cnt;
 }
 
-void *thread_proc(void *mem)
+static void *thread_proc(void *mem)
 {
 	int *m = mem;
 	long curr_faults, faults;
@@ -1487,7 +1489,7 @@ void *thread_proc(void *mem)
 	return NULL;
 }
 
-static void transact_test(int page_size)
+static void transact_test(void)
 {
 	unsigned int i, count, extra_pages;
 	unsigned int c;
@@ -1580,11 +1582,11 @@ static void transact_test(int page_size)
 			      extra_thread_faults);
 }
 
-void zeropfn_tests(void)
+static void zeropfn_tests(void)
 {
-	unsigned long long mem_size;
+	size_t mem_size, i;
 	struct page_region vec;
-	int i, ret;
+	int ret;
 	char *mmap_mem, *mem;
 
 	/* Test with normal memory */
@@ -1642,8 +1644,8 @@ void zeropfn_tests(void)
 
 int main(int __attribute__((unused)) argc, char *argv[])
 {
-	int shmid, buf_size, fd, i, ret;
-	unsigned long long mem_size;
+	int shmid, fd, ret;
+	size_t mem_size, buf_size, i;
 	char *mem, *map, *fmem;
 	struct stat sbuf;
 
@@ -1651,6 +1653,9 @@ int main(int __attribute__((unused)) argc, char *argv[])
 
 	ksft_print_header();
 
+	page_size = getpagesize();
+	hpage_size = read_pmd_pagesize();
+
 	if (init_uffd())
 		ksft_exit_skip("Failed to initialize userfaultfd\n");
 
@@ -1659,9 +1664,6 @@ int main(int __attribute__((unused)) argc, char *argv[])
 
 	ksft_set_plan(119);
 
-	page_size = getpagesize();
-	hpage_size = read_pmd_pagesize();
-
 	pagemap_fd = open(PAGEMAP, O_RDONLY);
 	if (pagemap_fd < 0)
 		ksft_exit_fail_msg("Failed to open " PAGEMAP "\n");
@@ -1821,7 +1823,7 @@ int main(int __attribute__((unused)) argc, char *argv[])
 	mprotect_tests();
 
 	/* 13. Transact test */
-	transact_test(page_size);
+	transact_test();
 
 	/* 14. Sanity testing */
 	sanity_tests();

gemini-3.7-flash

null

null

							input: 6200
							output: 74
							thoughts: 310
						

**My Assessment of the Patch**

Okay, let's break this down. The patch is touching `tools/testing/selftests/mm/pagemap_ioctl.c`. My mind immediately goes to the rules – specifically, when we can confidently say a change *isn't* worth fuzzing. I need to make the correct assessment of WorthFuzzing.

My primary focus is on section 2 of the criteria – the *negative* criteria. We're looking for reasons to rule this patch *out* of fuzzing scope. The rule is pretty clear: if all the modified code strictly falls into the category of "Non-kernel and non-executable changes, like user-space directories, self-tests, or scripts that *don't* affect the compiled kernel image (vmlinux) or kernel modules," then we return `WorthFuzzing=false`.

Now, looking at the modified file, it's undeniably within `tools/`, specifically under `tools/testing/selftests/mm/`. This immediately flags it as a selftest, which, by definition, is user-space code. The path alone is practically a guarantee that it doesn't touch the kernel image or modules. I need to be 100% sure, though. So, I'm checking the diff again – just to be certain.

Yep, the diff confirms it. The *only* change is to `tools/testing/selftests/mm/pagemap_ioctl.c`. Nothing else is impacted.

Therefore, the verdict is clear: `WorthFuzzing: false`. There is no reason to test this file as it is a user-space selftest, which is exactly why the file is stored in `tools`. The rules are met. Consequently, `EnableConfigs` and `FocusSymbols` will be empty, as this isn't kernel-space logic we're interested in fuzzing. The reasoning is solid: solely modifies a user-space selftest and has no bearing on the kernel image or modules.

Alright, let's call `set-results` and move on.

{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies user-space selftest code in tools/testing/selftests/mm/pagemap_ioctl.c, which does not affect the compiled kernel image or kernel-space logic.",
  "WorthFuzzing": false
}

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies user-space selftest code in tools/testing/selftests/mm/pagemap_ioctl.c, which does not affect the compiled kernel image or kernel-space logic.",
  "WorthFuzzing": false
}

{
  "WorthFuzzing": false
}

null