| Message ID | 20210626100931.22794-4-Kuan-Ying.Lee@mediatek.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | kasan: add memory corruption identification support for hw tag-based kasan | expand |
On Sat, 26 Jun 2021 at 12:09, Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com> wrote: > > 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. > > 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> > Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> > Cc: Dmitry Vyukov <dvyukov@google.com> > Cc: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Marco Elver <elver@google.com> > --- > lib/Kconfig.kasan | 2 +- > 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 952df2db7fdd..f58672f6029a 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 > -- > 2.18.0
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 952df2db7fdd..f58672f6029a 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