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| author |   Daniel Axtens <dja@axtens.net> | 2021-06-28 19:40:42 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2021-06-29 10:53:53 -0700 |
| commit | af3751f3c2b6282bebcb56c35bbe4c8b671f80aa (patch) | |
| tree | 1bfdeaffdc16132fe926773b99edee86bb4e99fc /mm/kasan/common.c | |
| parent | kasan: allow an architecture to disable inline instrumentation (diff) | |
| download | linux-dev-af3751f3c2b6282bebcb56c35bbe4c8b671f80aa.tar.xz linux-dev-af3751f3c2b6282bebcb56c35bbe4c8b671f80aa.zip | |
kasan: allow architectures to provide an outline readiness check
Allow architectures to define a kasan_arch_is_ready() hook that bails out
of any function that's about to touch the shadow unless the arch says that
it is ready for the memory to be accessed. This is fairly uninvasive and
should have a negligible performance penalty.
This will only work in outline mode, so an arch must specify
ARCH_DISABLE_KASAN_INLINE if it requires this.
Link: https://lkml.kernel.org/r/20210624034050.511391-3-dja@axtens.net
Signed-off-by: Daniel Axtens <dja@axtens.net>
Reviewed-by: Marco Elver <elver@google.com>
Suggested-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/kasan/common.c')
| -rw-r--r-- | mm/kasan/common.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/kasan/common.c b/mm/kasan/common.c index 2586d3718600..267500896b1e 100644 --- a/mm/kasan/common.c +++ b/mm/kasan/common.c @@ -331,6 +331,9 @@ static inline bool ____kasan_slab_free(struct kmem_cache *cache, void *object, u8 tag; void *tagged_object; + if (!kasan_arch_is_ready()) + return false; + tag = get_tag(object); tagged_object = object; object = kasan_reset_tag(object); |