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kasan: add memory corruption identification support for hardware tag-based mode

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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>
This commit is contained in:
Kuan-Ying Lee 2021-06-28 19:40:58 -07:00 committed by Linus Torvalds
parent a0503b8a0b
commit 7a22bdc3c4
2 changed files with 2 additions and 2 deletions
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2
lib/Kconfig.kasan
View File

@ -169,7 +169,7 @@ config KASAN_STACK
config KASAN_TAGS_IDENTIFY
bool "Enable memory corruption identification"
depends on KASAN_SW_TAGS
depends on KASAN_SW_TAGS || KASAN_HW_TAGS
help
This option enables best-effort identification of bug type
(use-after-free or out-of-bounds) at the cost of increased

2
mm/kasan/kasan.h
View File

@ -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