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authorAndrey Ryabinin <aryabinin@virtuozzo.com>2016-08-02 14:02:52 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-08-02 17:31:41 -0400
commitb3cbd9bf77cd1888114dbee1653e79aa23fd4068 (patch)
treef9a10e2c14b336f276805f8a4714d0bd437d1646 /mm/kasan/report.c
parent47b5c2a0f021e90a79845d1a1353780e5edd0bce (diff)
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.c23
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)