kasan: add __must_check annotations to kasan hooks
This patch adds __must_check annotations to kasan hooks that return a
pointer to make sure that a tagged pointer always gets propagated.
Link: http://lkml.kernel.org/r/03b269c5e453945f724bfca3159d4e1333a8fb1c.1544099024.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Suggested-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index 195ca385..1144e74 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -373,7 +373,8 @@ static u8 assign_tag(struct kmem_cache *cache, const void *object, bool new)
#endif
}
-void *kasan_init_slab_obj(struct kmem_cache *cache, const void *object)
+void * __must_check kasan_init_slab_obj(struct kmem_cache *cache,
+ const void *object)
{
struct kasan_alloc_meta *alloc_info;
@@ -389,7 +390,8 @@ void *kasan_init_slab_obj(struct kmem_cache *cache, const void *object)
return (void *)object;
}
-void *kasan_slab_alloc(struct kmem_cache *cache, void *object, gfp_t flags)
+void * __must_check kasan_slab_alloc(struct kmem_cache *cache, void *object,
+ gfp_t flags)
{
return kasan_kmalloc(cache, object, cache->object_size, flags);
}
@@ -449,8 +451,8 @@ bool kasan_slab_free(struct kmem_cache *cache, void *object, unsigned long ip)
return __kasan_slab_free(cache, object, ip, true);
}
-void *kasan_kmalloc(struct kmem_cache *cache, const void *object, size_t size,
- gfp_t flags)
+void * __must_check kasan_kmalloc(struct kmem_cache *cache, const void *object,
+ size_t size, gfp_t flags)
{
unsigned long redzone_start;
unsigned long redzone_end;
@@ -482,7 +484,8 @@ void *kasan_kmalloc(struct kmem_cache *cache, const void *object, size_t size,
}
EXPORT_SYMBOL(kasan_kmalloc);
-void *kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags)
+void * __must_check kasan_kmalloc_large(const void *ptr, size_t size,
+ gfp_t flags)
{
struct page *page;
unsigned long redzone_start;
@@ -506,7 +509,7 @@ void *kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags)
return (void *)ptr;
}
-void *kasan_krealloc(const void *object, size_t size, gfp_t flags)
+void * __must_check kasan_krealloc(const void *object, size_t size, gfp_t flags)
{
struct page *page;