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kasan: turn on -fsanitize-address-use-after-scope 

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
828347f8f9 ("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@virtuozzo.com
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>
This commit is contained in:
Andrey Ryabinin 2016-12-12 16:44:59 -08:00 committed by Linus Torvalds
parent 64abdcb243
commit c5caf21ab0
1 changed files with 2 additions and 0 deletions
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2
scripts/Makefile.kasan
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@ -28,4 +28,6 @@ else
CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)
endif
endif
CFLAGS_KASAN += $(call cc-option, -fsanitize-address-use-after-scope)
endif