Messages in this thread Patch in this message | | | From | Alexander Potapenko <> | Subject | [PATCH v8 2/3] mm, kasan: align free_meta_offset on sizeof(void*) | Date | Thu, 28 Jul 2016 17:31:18 +0200 |
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When free_meta_offset is not zero, it is usually aligned on 4 bytes, because the size of preceding kasan_alloc_meta is aligned on 4 bytes. As a result, accesses to kasan_free_meta fields may be misaligned.
Signed-off-by: Alexander Potapenko <glider@google.com> --- mm/kasan/kasan.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c index 6845f92..0379551 100644 --- a/mm/kasan/kasan.c +++ b/mm/kasan/kasan.c @@ -390,7 +390,8 @@ void kasan_cache_create(struct kmem_cache *cache, size_t *size, /* Add free meta. */ if (cache->flags & SLAB_DESTROY_BY_RCU || cache->ctor || cache->object_size < sizeof(struct kasan_free_meta)) { - cache->kasan_info.free_meta_offset = *size; + cache->kasan_info.free_meta_offset = + ALIGN(*size, sizeof(void *)); *size += sizeof(struct kasan_free_meta); } redzone_adjust = optimal_redzone(cache->object_size) - -- 2.8.0.rc3.226.g39d4020
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