Re: [PATCH] kasan: turn on -fsanitize-address-use-after-scope
From: Dmitry Vyukov
Date: Thu Dec 08 2016 - 09:42:41 EST
On Thu, Dec 8, 2016 at 1:48 PM, Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> wrote:
> In the upcoming gcc7 release release, the -fsanitize=kernel-address option
> at first implied new -fsanitize-address-use-after-scope option.
> This would cause link errors on older kernels because they don't have
> two new functions required for use-after-scope support. Therefore,
> gcc7 changed default to -fno-sanitize-address-use-after-scope.
> Now the kernel has everything required for that feature since
> commit 828347f8f9a5 ("kasan: support use-after-scope detection").
> So, to make it work, we just have to enable use-after-scope in CFLAGS.
> Signed-off-by: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
> scripts/Makefile.kasan | 2 ++
> 1 file changed, 2 insertions(+)
> diff --git a/scripts/Makefile.kasan b/scripts/Makefile.kasan
> index 37323b0..9576775 100644
> --- a/scripts/Makefile.kasan
> +++ b/scripts/Makefile.kasan
> @@ -28,4 +28,6 @@ else
> CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)
> +CFLAGS_KASAN += $(call cc-option, -fsanitize-address-use-after-scope)
Doubled word "release release" on the first line of description.
Acked-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
I've just submitted the corresponding gcc change: