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authorAndrey Konovalov <andreyknvl@google.com>2022-09-06 00:05:29 +0300
committerAndrew Morton <akpm@linux-foundation.org>2022-10-04 00:02:58 +0300
commitf372bde922e2ced8e0b5a928887b4cf587cc4453 (patch)
tree0d7ff3be335bd9b92c696f423d20f91e336b9dc0 /mm/kasan/generic.c
parent02856beb2d801423f88f2e8cb2eed0d6f14a4f92 (diff)
downloadlinux-f372bde922e2ced8e0b5a928887b4cf587cc4453.tar.xz
kasan: only define kasan_metadata_size for Generic mode
KASAN provides a helper for calculating the size of per-object metadata stored in the redzone. As now only the Generic mode uses per-object metadata, only define kasan_metadata_size() for this mode. Link: https://lkml.kernel.org/r/8f81d4938b80446bc72538a08217009f328a3e23.1662411799.git.andreyknvl@google.com Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Reviewed-by: Marco Elver <elver@google.com> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Evgenii Stepanov <eugenis@google.com> Cc: Peter Collingbourne <pcc@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/kasan/generic.c')
-rw-r--r--mm/kasan/generic.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/mm/kasan/generic.c b/mm/kasan/generic.c
index 5125fad76f70..806ab92032c3 100644
--- a/mm/kasan/generic.c
+++ b/mm/kasan/generic.c
@@ -427,6 +427,17 @@ void kasan_init_object_meta(struct kmem_cache *cache, const void *object)
__memset(alloc_meta, 0, sizeof(*alloc_meta));
}
+size_t kasan_metadata_size(struct kmem_cache *cache)
+{
+ if (!kasan_requires_meta())
+ return 0;
+ return (cache->kasan_info.alloc_meta_offset ?
+ sizeof(struct kasan_alloc_meta) : 0) +
+ ((cache->kasan_info.free_meta_offset &&
+ cache->kasan_info.free_meta_offset != KASAN_NO_FREE_META) ?
+ sizeof(struct kasan_free_meta) : 0);
+}
+
static void __kasan_record_aux_stack(void *addr, bool can_alloc)
{
struct slab *slab = kasan_addr_to_slab(addr);