On 5/6/19 5:32 PM, Greg Kroah-Hartman wrote:
From: Andrey Ryabinin aryabinin@virtuozzo.com
commit c5caf21ab0cf884ef15b25af234f620e4a233139 upstream.
In the upcoming gcc7 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.
Link: http://lkml.kernel.org/r/1481207977-28654-1-git-send-email-aryabinin@virtuoz... Signed-off-by: Andrey Ryabinin aryabinin@virtuozzo.com Acked-by: Dmitry Vyukov dvyukov@google.com Cc: Alexander Potapenko glider@google.com Cc: Andrey Konovalov andreyknvl@google.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Andrey Konovalov andreyknvl@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
scripts/Makefile.kasan | 2 ++ 1 file changed, 2 insertions(+)
--- a/scripts/Makefile.kasan +++ b/scripts/Makefile.kasan @@ -29,6 +29,8 @@ else endif endif +CFLAGS_KASAN += $(call cc-option, -fsanitize-address-use-after-scope)
CFLAGS_KASAN_NOSANITIZE := -fno-builtin endif
This shouldn't be in the -stable.