diff options
| author | Andrey Konovalov <andreyknvl@google.com> | 2022-09-06 00:05:29 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-10-04 00:02:58 +0300 |
| commit | f372bde922e2ced8e0b5a928887b4cf587cc4453 (patch) | |
| tree | 0d7ff3be335bd9b92c696f423d20f91e336b9dc0 /mm/kasan/generic.c | |
| parent | 02856beb2d801423f88f2e8cb2eed0d6f14a4f92 (diff) | |
| download | linux-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.c | 11 |
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); |