]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
kasan: allow architectures to provide an outline readiness check
authorDaniel Axtens <dja@axtens.net>
Tue, 29 Jun 2021 02:40:42 +0000 (19:40 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 29 Jun 2021 17:53:53 +0000 (10:53 -0700)
commitaf3751f3c2b6282bebcb56c35bbe4c8b671f80aa
tree1bfdeaffdc16132fe926773b99edee86bb4e99fc
parent158f25522ca8cc87f512a03ed5e2a5923bd37eb3
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>
mm/kasan/common.c
mm/kasan/generic.c
mm/kasan/kasan.h
mm/kasan/shadow.c