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author | Andrey Ryabinin <aryabinin@virtuozzo.com> | 2016-08-02 14:02:52 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-08-02 17:31:41 -0400 |
commit | b3cbd9bf77cd1888114dbee1653e79aa23fd4068 (patch) | |
tree | f9a10e2c14b336f276805f8a4714d0bd437d1646 /mm/kasan/report.c | |
parent | 47b5c2a0f021e90a79845d1a1353780e5edd0bce (diff) | |
download | linux-b3cbd9bf77cd1888114dbee1653e79aa23fd4068.tar.bz2 |
mm/kasan: get rid of ->state in struct kasan_alloc_meta
The state of object currently tracked in two places - shadow memory, and
the ->state field in struct kasan_alloc_meta. We can get rid of the
latter. The will save us a little bit of memory. Also, this allow us
to move free stack into struct kasan_alloc_meta, without increasing
memory consumption. So now we should always know when the last time the
object was freed. This may be useful for long delayed use-after-free
bugs.
As a side effect this fixes following UBSAN warning:
UBSAN: Undefined behaviour in mm/kasan/quarantine.c:102:13
member access within misaligned address ffff88000d1efebc for type 'struct qlist_node'
which requires 8 byte alignment
Link: http://lkml.kernel.org/r/1470062715-14077-5-git-send-email-aryabinin@virtuozzo.com
Reported-by: kernel test robot <xiaolong.ye@intel.com>
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/kasan/report.c')
-rw-r--r-- | mm/kasan/report.c | 23 |
1 files changed, 5 insertions, 18 deletions
diff --git a/mm/kasan/report.c b/mm/kasan/report.c index d67a7e020905..f437398b685a 100644 --- a/mm/kasan/report.c +++ b/mm/kasan/report.c @@ -133,7 +133,6 @@ static void kasan_object_err(struct kmem_cache *cache, struct page *page, void *object, char *unused_reason) { struct kasan_alloc_meta *alloc_info = get_alloc_info(cache, object); - struct kasan_free_meta *free_info; dump_stack(); pr_err("Object at %p, in cache %s size: %d\n", object, cache->name, @@ -141,23 +140,11 @@ static void kasan_object_err(struct kmem_cache *cache, struct page *page, if (!(cache->flags & SLAB_KASAN)) return; - switch (alloc_info->state) { - case KASAN_STATE_INIT: - pr_err("Object not allocated yet\n"); - break; - case KASAN_STATE_ALLOC: - pr_err("Allocation:\n"); - print_track(&alloc_info->track); - break; - case KASAN_STATE_FREE: - case KASAN_STATE_QUARANTINE: - free_info = get_free_info(cache, object); - pr_err("Allocation:\n"); - print_track(&alloc_info->track); - pr_err("Deallocation:\n"); - print_track(&free_info->track); - break; - } + + pr_err("Allocated:\n"); + print_track(&alloc_info->alloc_track); + pr_err("Freed:\n"); + print_track(&alloc_info->free_track); } static void print_address_description(struct kasan_access_info *info) |