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authorAndrey Konovalov <andreyknvl@google.com>2018-12-28 11:31:01 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-12-28 23:11:44 +0300
commit66afc7f1e07a1db74453be9167ac0d1205653854 (patch)
tree2095f9924d6a513f7e71cbd8c1c710f97c632e8f /mm/kasan
parent2813b9c0296259fb11e75c839bab2d958ba4f96c (diff)
downloadlinux-66afc7f1e07a1db74453be9167ac0d1205653854.tar.xz
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>
Diffstat (limited to 'mm/kasan')
-rw-r--r--mm/kasan/common.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index 195ca385cf7a..1144e741feb6 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;