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linux/tools/testing/selftests/mm
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Anshuman d16e52a9ba selftests/mm: check stat() return value in khugepaged get_finfo() 
get_finfo() calls stat() to get metadata about the target directory, but
never checks the return value.  On failure, stat() returns -1 and leaves
path_stat unmodified, so path_stat.st_mode may contain uninitialized stack
data.

The code then checks S_ISDIR(path_stat.st_mode) against this potentially
garbage value.  This can produce a misleading "Not a directory" error when
the real problem is a nonexistent or inaccessible path, or, in the worst
case, the check could pass by chance on garbage data and let the function
continue using an invalid path_stat for the rest of its logic.

Check the return value and fail with a clear error message if stat()
fails, matching the error-handling style already used for statfs() and
read_file() later in the same function.

Link: https://lore.kernel.org/20260819121426.49500-1-anshumantewari123@gmail.com
Signed-off-by: Anshuman <anshumantewari123@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: SJ Park <sj@kernel.org>
Reviewed-by: Sarthak Sharma <sarthak.sharma@arm.com>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2026-08-24 18:43:27 -07:00
..
page_frag mm/page_frag: reject invalid CPUs in page_frag_test 2026-06-21 11:37:37 -07:00
.gitignore selftests/mm: use pattern matching in .gitignore 2026-08-24 18:43:02 -07:00
charge_reserved_hugetlb.sh selftests/mm: fix hugetlb pathname construction in charge_reserved_hugetlb.sh 2026-06-21 11:37:32 -07:00
check_config.sh selftests/mm: rename local_config.h to local_config.h_gen 2026-08-24 18:43:01 -07:00
compaction_test.c selftests/mm: read memory information without popen 2026-08-24 18:43:01 -07:00
config selftests/mm: specify requirement for PROC_MEM_ALWAYS_FORCE=y 2026-04-27 05:54:26 -07:00
cow.c selftests/mm: skip COW tmpfile cases when fallocate() is unsupported 2026-08-24 18:43:09 -07:00
droppable.c selftests: mm: fix and speedup "droppable" test 2026-06-21 11:37:36 -07:00
folio_split_race_test.c selftests: mm: extend the check_huge() to support mTHP check 2026-08-24 18:43:07 -07:00
guard-regions.c selftests/mm: skip guard hole-punch test if MADV_REMOVE is unsupported 2026-08-24 18:43:09 -07:00
gup_longterm.c selftests/mm: rename local_config.h to local_config.h_gen 2026-08-24 18:43:01 -07:00
gup_test.c selftests/mm: gup_test: add setup of HugeTLB pages 2026-06-21 11:37:26 -07:00
hmm-tests.c selftests/mm: factor out hmm_buffer_alloc() to consolidate buffer setup 2026-08-06 18:56:56 -07:00
hugepage_settings.c selftests/mm: handle EINVAL when configuring gigantic hugepages 2026-08-04 19:18:47 -07:00
hugepage_settings.h selftests/mm: move read_file(), read_num() and write_num() to vm_util 2026-06-21 11:37:24 -07:00
hugetlb_dio.c selftests/mm: hugepage_dio: add setup of HugeTLB pages 2026-06-21 11:37:26 -07:00
hugetlb_fault_after_madv.c selftests/mm: hugetlb_fault_after_madv: add setup of HugeTLB pages 2026-06-21 11:37:26 -07:00
hugetlb_madv_vs_map.c selftests/mm: hugetlb_madv_vs_map: add setup of HugeTLB pages 2026-06-21 11:37:27 -07:00
hugetlb_reparenting_test.sh selftests/mm: fix cgroup task placement and drop memory.current checks in hugetlb_reparenting_test.sh 2026-06-21 11:37:33 -07:00
hugetlb-madvise.c selftests/mm: hugetlb-madvise: add setup of HugeTLB pages 2026-06-21 11:37:27 -07:00
hugetlb-mmap.c selftests/mm: hugetlb-mmap: add setup of HugeTLB pages 2026-06-21 11:37:27 -07:00
hugetlb-mremap.c selftests/mm: ensure destination is hugetlb-backed in hugetlb-mremap 2026-06-21 11:37:34 -07:00
hugetlb-read-hwpoison.c selftests/mm: hugetlb-read-hwpoison: use kselftest framework 2026-06-21 11:37:20 -07:00
hugetlb-shm.c selftests/mm: hugetlb-shm: add setup of HugeTLB pages 2026-06-21 11:37:28 -07:00
hugetlb-soft-offline.c selftests/mm: hugetlb-soft-offline: add setup of HugeTLB pages 2026-06-21 11:37:28 -07:00
khugepaged.c selftests/mm: check stat() return value in khugepaged get_finfo() 2026-08-24 18:43:27 -07:00
ksft_compaction.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksft_cow.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksft_gup_test.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksft_hmm.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksft_hugetlb.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksft_hugevm.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksft_kmemleak_confirm.sh selftests/mm: kmemleak: drop stale min_unref_scans default from comments 2026-08-24 18:43:18 -07:00
ksft_kmemleak_dedup.sh selftests/mm: add kmemleak verbose dedup test 2026-05-28 21:05:09 -07:00
ksft_ksm_numa.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksft_ksm.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksft_madv_guard.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksft_madv_populate.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksft_mdwe.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksft_memfd_secret.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksft_memory_failure.sh selftests/mm: add memory failure anonymous page test 2026-02-12 15:43:01 -08:00
ksft_migration.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksft_mkdirty.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksft_mlock.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksft_mmap.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksft_mremap.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksft_page_frag.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksft_pagemap.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksft_pfnmap.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksft_pkey.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksft_process_madv.sh selftests/mm: fix ksft_process_madv.sh test category 2026-07-01 19:02:52 -07:00
ksft_process_mrelease.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksft_rmap.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksft_soft_dirty.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksft_thp.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksft_userfaultfd.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksft_vma_merge.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksft_vmalloc.sh selftests/mm: have the harness run each test category separately 2026-01-31 14:22:53 -08:00
ksm_functional_tests.c selftests/mm: ksm-functional-tests: fix partial write handling 2026-06-02 15:22:15 -07:00
ksm_tests.c selftests/mm: fix ternary operator precedence in ksm_tests 2026-08-04 19:18:48 -07:00
madv_populate.c selftests/mm: fix incorrect mmap() error handling with NULL instead of MAP_FAILED 2026-06-21 11:37:31 -07:00
Makefile selftests: mm: test kmemleak's N-consecutive-scan leak confirmation 2026-08-24 18:43:18 -07:00
map_fixed_noreplace.c selftests: complete kselftest include centralization 2025-11-27 14:24:31 -08:00
map_populate.c selftests: complete kselftest include centralization 2025-11-27 14:24:31 -08:00
mdwe_test.c selftests: complete kselftest include centralization 2025-11-27 14:24:31 -08:00
memfd_secret.c selftests: complete kselftest include centralization 2025-11-27 14:24:31 -08:00
memory-failure.c selftests/mm: skip hard dirty page-cache test on NFS 2026-08-24 18:43:09 -07:00
merge.c tools/testing/selftests/mm: test anonymous page offset merge behaviour 2026-08-24 18:42:54 -07:00
migration.c selftests/mm: retry migration failures for the full runtime 2026-08-24 18:43:10 -07:00
mkdirty.c selftests: complete kselftest include centralization 2025-11-27 14:24:31 -08:00
mlock-random-test.c selftests/mm: fix potential wild pointer access of getline due to missing init 2026-07-28 17:37:34 -07:00
mlock2-tests.c selftests/mm: verify droppable mappings cannot be locked 2026-05-28 21:04:48 -07:00
mlock2.h selftests/mm/mlock: print error on failure 2025-03-16 22:06:40 -07:00
mrelease_test.c selftests: complete kselftest include centralization 2025-11-27 14:24:31 -08:00
mremap_dontunmap.c selftests/mm: fix BUG_ON checking wrong variable in mremap_dontunmap 2026-08-06 18:57:14 -07:00
mremap_test.c selftests/mm: simplify byte pattern checking in mremap_test 2026-05-28 21:04:53 -07:00
mseal_helpers.h selftests/mm: mseal, self_elf: rename TEST_END_CHECK to REPORT_TEST_PASS 2024-07-03 19:30:07 -07:00
mseal_test.c selftests/mm: drop duplicate test_seal_mprotect_two_vma_with_gap() call 2026-08-24 18:43:08 -07:00
on-fault-limit.c selftests: complete kselftest include centralization 2025-11-27 14:24:31 -08:00
pagemap_ioctl.c selftests/mm: drop redundant open() in mprotect_tests() 2026-08-24 18:43:26 -07:00
pfnmap.c selftests/mm: report SKIP in pfnmap if a check fails 2026-01-31 14:22:42 -08:00
pkey_sighandler_tests.c selftests/mm: fix clone cleartid race in pkey sighandler tests 2026-07-30 19:40:30 -07:00
pkey_util.c selftests/mm: move pkey selftest helpers to pkey_util.c 2026-07-30 19:40:29 -07:00
pkey-arm64.h selftests/mm: Fix resv_sz when parsing arm64 signal frame 2026-05-19 11:54:03 +01:00
pkey-helpers.h selftests/mm: move pkey selftest helpers to pkey_util.c 2026-07-30 19:40:29 -07:00
pkey-powerpc.h selftests/mm: add missing mmap() return checks in pkey tests 2026-07-30 19:40:30 -07:00
pkey-x86.h selftests/mm: ensure pkey-*.h define inline functions only 2025-01-13 22:40:55 -08:00
prctl_thp_disable.c selftests: mm: extend the check_huge() to support mTHP check 2026-08-24 18:43:07 -07:00
process_madv.c mm/madvise: reject invalid process_madvise() advice for zero-length vectors 2026-05-28 21:04:57 -07:00
protection_keys.c selftests/mm: add missing mmap() return checks in pkey tests 2026-07-30 19:40:30 -07:00
rmap.c ksm: add mremap selftests for ksm_rmap_walk 2026-08-04 19:18:45 -07:00
run_vmtests.sh selftests: mm: add mTHP collapse test cases 2026-08-24 18:43:07 -07:00
settings selftests/mm: increase timeout from 180 to 900 seconds 2025-06-19 20:48:01 -07:00
soft-dirty.c selftests/mm: fix unchecked ftruncate return value in soft-dirty test 2026-08-24 18:43:27 -07:00
split_huge_page_test.c selftests: mm: move gather_after_split_folio_orders() into vm_util.c file 2026-08-24 18:43:07 -07:00
test_hmm.sh selftests/mm: give scripts execute permission 2023-07-14 09:24:31 -07:00
test_page_frag.sh mm: page_frag: add a test module for page_frag 2024-11-11 10:56:26 -08:00
test_vmalloc.sh lib/test_vmalloc.c: minor fixes to test_vmalloc.c 2026-01-20 19:24:47 -08:00
thuge-gen.c selftests/mm: thuge-gen: fix test_shmget() for PAGE_SIZE check 2026-08-15 21:12:24 -07:00
transhuge-stress.c selftests/mm: rename thp_settings.[ch] to hugepage_settings.[ch] 2026-06-21 11:37:23 -07:00
uffd-common.c selftests: mm: extend the check_huge() to support mTHP check 2026-08-24 18:43:07 -07:00
uffd-common.h selftests/mm: move HugeTLB helpers to hugepage_settings 2026-06-21 11:37:23 -07:00
uffd-stress.c selftests/mm: skip uffd-stress test when nr_pages_per_cpu is zero 2026-06-21 11:37:34 -07:00
uffd-unit-tests.c selftests/mm: add userfaultfd RWP tests 2026-08-04 19:18:39 -07:00
uffd-wp-mremap.c selftests/mm: skip uffd-wp-mremap if UFFD write-protect is unsupported 2026-06-21 11:37:34 -07:00
va_high_addr_switch.c selftests/mm: va_high_addr_switch: add setup of HugeTLB pages 2026-06-21 11:37:30 -07:00
va_high_addr_switch.sh selftests/mm: va_high_addr_switch.sh: drop huge pages setup 2026-06-21 11:37:30 -07:00
vm_util.c selftests/mm: fix read_file() return value check 2026-08-24 18:43:11 -07:00
vm_util.h selftests: mm: move gather_after_split_folio_orders() into vm_util.c file 2026-08-24 18:43:07 -07:00
write_hugetlb_memory.sh selftests/mm: switch to bash from sh 2024-01-25 23:52:20 -08:00
write_to_hugetlbfs.c selftests/mm/write_to_hugetlbfs: parse -s as size_t 2026-01-20 19:24:50 -08:00