diff options
| author | Kuan-Ying Lee <[email protected]> | 2021-06-28 19:40:58 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2021-06-29 10:53:53 -0700 |
| commit | 7a22bdc3c443d5abc420df1381e425b49e8901a3 (patch) | |
| tree | e1b4ae8542080a1124c61f69f697cfabf39ab7e7 | |
| parent | a0503b8a0b3c8ef1be55744a248bffb8f533d227 (diff) | |
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/[email protected]
Signed-off-by: Kuan-Ying Lee <[email protected]>
Suggested-by: Marco Elver <[email protected]>
Reviewed-by: Alexander Potapenko <[email protected]>
Reviewed-by: Andrey Konovalov <[email protected]>
Reviewed-by: Marco Elver <[email protected]>
Cc: Andrey Ryabinin <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: Chinwen Chang <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Matthias Brugger <[email protected]>
Cc: Nicholas Tang <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
| -rw-r--r-- | lib/Kconfig.kasan | 2 | ||||
| -rw-r--r-- | mm/kasan/kasan.h | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan index fdb4a08dba83..1e2d10f86011 100644 --- a/lib/Kconfig.kasan +++ b/lib/Kconfig.kasan @@ -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 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 |