diff options
| author | Andrey Konovalov <andreyknvl@google.com> | 2023-12-19 23:28:47 +0100 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-12-29 11:58:36 -0800 |
| commit | 1bb843048d00050678c392dab87a15c8b756df6f (patch) | |
| tree | 15091116fa3a32d3155b4b3c6668614578f24e94 | |
| parent | 9b94fe91099cbf05606151ef05bea9632666f5d5 (diff) | |
kasan: document kasan_mempool_poison_object
Add documentation comment for kasan_mempool_poison_object.
Link: https://lkml.kernel.org/r/af33ba8cabfa1ad731fe23a3f874bfc8d3b7fed4.1703024586.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Alexander Lobakin <alobakin@pm.me>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Breno Leitao <leitao@debian.org>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Marco Elver <elver@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | include/linux/kasan.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/kasan.h b/include/linux/kasan.h index 0d1f925c136d..bbf6e2fa4ffd 100644 --- a/include/linux/kasan.h +++ b/include/linux/kasan.h @@ -213,6 +213,24 @@ static __always_inline void * __must_check kasan_krealloc(const void *object, } void __kasan_mempool_poison_object(void *ptr, unsigned long ip); +/** + * kasan_mempool_poison_object - Check and poison a mempool slab allocation. + * @ptr: Pointer to the slab allocation. + * + * This function is intended for kernel subsystems that cache slab allocations + * to reuse them instead of freeing them back to the slab allocator (e.g. + * mempool). + * + * This function poisons a slab allocation without initializing its memory and + * without putting it into the quarantine (for the Generic mode). + * + * This function also performs checks to detect double-free and invalid-free + * bugs and reports them. + * + * This function operates on all slab allocations including large kmalloc + * allocations (the ones returned by kmalloc_large() or by kmalloc() with the + * size > KMALLOC_MAX_SIZE). + */ static __always_inline void kasan_mempool_poison_object(void *ptr) { if (kasan_enabled()) |