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| author | Andrey Konovalov <andreyknvl@google.com> | 2022-09-05 23:05:30 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-10-03 14:02:58 -0700 |
| commit | 3b7f8813e9ecf7fe91f2f8dc3b581a111cd374a5 (patch) | |
| tree | 5cebe42b30879ee83ee7a7f8ef8cda292ff064ef /mm/kasan/generic.c | |
| parent | f372bde922e2ced8e0b5a928887b4cf587cc4453 (diff) | |
| download | linux-3b7f8813e9ecf7fe91f2f8dc3b581a111cd374a5.tar.gz linux-3b7f8813e9ecf7fe91f2f8dc3b581a111cd374a5.tar.bz2 linux-3b7f8813e9ecf7fe91f2f8dc3b581a111cd374a5.zip | |
kasan: only define kasan_never_merge for Generic mode
KASAN prevents merging of slab caches whose objects have per-object
metadata stored in redzones.
As now only the Generic mode uses per-object metadata, define
kasan_never_merge() only for this mode.
Link: https://lkml.kernel.org/r/81ed01f29ff3443580b7e2fe362a8b47b1e8006d.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 | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/mm/kasan/generic.c b/mm/kasan/generic.c index 806ab92032c3..25333bf3c99f 100644 --- a/mm/kasan/generic.c +++ b/mm/kasan/generic.c @@ -328,6 +328,14 @@ DEFINE_ASAN_SET_SHADOW(f3); DEFINE_ASAN_SET_SHADOW(f5); DEFINE_ASAN_SET_SHADOW(f8); +/* Only allow cache merging when no per-object metadata is present. */ +slab_flags_t kasan_never_merge(void) +{ + if (!kasan_requires_meta()) + return 0; + return SLAB_KASAN; +} + /* * Adaptive redzone policy taken from the userspace AddressSanitizer runtime. * For larger allocations larger redzones are used. |