From: Andrey Ryabinin <[email protected]>
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/[email protected]
Signed-off-by: Andrey Ryabinin <[email protected]>
Acked-by: Dmitry Vyukov <[email protected]>
Cc: Alexander Potapenko <[email protected]>
Cc: Andrey Konovalov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Andrey Konovalov <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
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
