summaryrefslogtreecommitdiff
path: root/mm/kasan
diff options
context:
space:
mode:
authorKuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>2021-06-29 05:40:58 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-06-29 20:53:53 +0300
commit7a22bdc3c443d5abc420df1381e425b49e8901a3 (patch)
treee1b4ae8542080a1124c61f69f697cfabf39ab7e7 /mm/kasan
parenta0503b8a0b3c8ef1be55744a248bffb8f533d227 (diff)
downloadlinux-7a22bdc3c443d5abc420df1381e425b49e8901a3.tar.xz
kasan: add memory corruption identification support for hardware tag-based mode
Add memory corruption identification support for hardware tag-based mode. We store one old free pointer tag and free backtrace instead of five because hardware tag-based kasan only has 16 different tags. If we store as many stacks as SW tag-based kasan does(5 stacks), there is high probability to find the same tag in the stacks when out-of-bound issues happened and we will mistake out-of-bound issue for use-after-free. Link: https://lkml.kernel.org/r/20210626100931.22794-4-Kuan-Ying.Lee@mediatek.com Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com> Suggested-by: Marco Elver <elver@google.com> Reviewed-by: Alexander Potapenko <glider@google.com> Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com> Reviewed-by: Marco Elver <elver@google.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Chinwen Chang <chinwen.chang@mediatek.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Matthias Brugger <matthias.bgg@gmail.com> Cc: Nicholas Tang <nicholas.tang@mediatek.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/kasan')
-rw-r--r--mm/kasan/kasan.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
index 2317d0943a07..98e3059bfea4 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h
@@ -153,7 +153,7 @@ struct kasan_track {
depot_stack_handle_t stack;
};
-#ifdef CONFIG_KASAN_TAGS_IDENTIFY
+#if defined(CONFIG_KASAN_TAGS_IDENTIFY) && defined(CONFIG_KASAN_SW_TAGS)
#define KASAN_NR_FREE_STACKS 5
#else
#define KASAN_NR_FREE_STACKS 1