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| author |   Dmitry Vyukov <dvyukov@google.com> | 2018-02-06 15:36:30 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2018-02-06 18:32:43 -0800 |
| commit | 6860f6340c0918cddcd3c9fcf8c36401c8184268 (patch) | |
| tree | 59b652f61341d35394d745a3010bb437a54d6421 /include/linux/kasan.h | |
| parent | kasan: don't use __builtin_return_address(1) (diff) | |
| download | wireguard-linux-6860f6340c0918cddcd3c9fcf8c36401c8184268.tar.xz wireguard-linux-6860f6340c0918cddcd3c9fcf8c36401c8184268.zip | |
kasan: detect invalid frees for large mempool objects
Detect frees of pointers into middle of mempool objects.
I did a one-off test, but it turned out to be very tricky, so I reverted
it. First, mempool does not call kasan_poison_kfree() unless allocation
function fails. I stubbed an allocation function to fail on second and
subsequent allocations. But then mempool stopped to call
kasan_poison_kfree() at all, because it does it only when allocation
function is mempool_kmalloc(). We could support this special failing
test allocation function in mempool, but it also can't live with kasan
tests, because these are in a module.
Link: http://lkml.kernel.org/r/bf7a7d035d7a5ed62d2dd0e3d2e8a4fcdf456aa7.1514378558.git.dvyukov@google.com
Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>a
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/kasan.h')
| -rw-r--r-- | include/linux/kasan.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/kasan.h b/include/linux/kasan.h index f0d13c30acc6..fc45f8952d1e 100644 --- a/include/linux/kasan.h +++ b/include/linux/kasan.h @@ -57,7 +57,7 @@ void kasan_init_slab_obj(struct kmem_cache *cache, const void *object); void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags); void kasan_kfree_large(void *ptr, unsigned long ip); -void kasan_poison_kfree(void *ptr); +void kasan_poison_kfree(void *ptr, unsigned long ip); void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size, gfp_t flags); void kasan_krealloc(const void *object, size_t new_size, gfp_t flags); @@ -109,7 +109,7 @@ static inline void kasan_init_slab_obj(struct kmem_cache *cache, static inline void kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) {} static inline void kasan_kfree_large(void *ptr, unsigned long ip) {} -static inline void kasan_poison_kfree(void *ptr) {} +static inline void kasan_poison_kfree(void *ptr, unsigned long ip) {} static inline void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size, gfp_t flags) {} static inline void kasan_krealloc(const void *object, size_t new_size, |