From: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Subject: 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
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@xxxxxxxxxxxxx
Signed-off-by: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Acked-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
scripts/Makefile.kasan | 2 ++
1 file changed, 2 insertions(+)
diff -puN scripts/Makefile.kasan~kasan-turn-on-fsanitize-address-use-after-scope scripts/Makefile.kasan
--- a/scripts/Makefile.kasan~kasan-turn-on-fsanitize-address-use-after-scope
+++ a/scripts/Makefile.kasan
@@ -28,4 +28,6 @@ else
CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)
endif
endif
+
+CFLAGS_KASAN += $(call cc-option, -fsanitize-address-use-after-scope)
endif
_
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