c5caf21ab0
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>
33 lines
1,005 B
Text
33 lines
1,005 B
Text
ifdef CONFIG_KASAN
|
|
ifdef CONFIG_KASAN_INLINE
|
|
call_threshold := 10000
|
|
else
|
|
call_threshold := 0
|
|
endif
|
|
|
|
KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
|
|
|
|
CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address
|
|
|
|
CFLAGS_KASAN := $(call cc-option, -fsanitize=kernel-address \
|
|
-fasan-shadow-offset=$(KASAN_SHADOW_OFFSET) \
|
|
--param asan-stack=1 --param asan-globals=1 \
|
|
--param asan-instrumentation-with-call-threshold=$(call_threshold))
|
|
|
|
ifeq ($(call cc-option, $(CFLAGS_KASAN_MINIMAL) -Werror),)
|
|
ifneq ($(CONFIG_COMPILE_TEST),y)
|
|
$(warning Cannot use CONFIG_KASAN: \
|
|
-fsanitize=kernel-address is not supported by compiler)
|
|
endif
|
|
else
|
|
ifeq ($(CFLAGS_KASAN),)
|
|
ifneq ($(CONFIG_COMPILE_TEST),y)
|
|
$(warning CONFIG_KASAN: compiler does not support all options.\
|
|
Trying minimal configuration)
|
|
endif
|
|
CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)
|
|
endif
|
|
endif
|
|
|
|
CFLAGS_KASAN += $(call cc-option, -fsanitize-address-use-after-scope)
|
|
endif
|