mirror of
https://github.com/torvalds/linux.git
synced 2024-11-14 08:02:07 +00:00
34b5560db4
The generic Makefile.kasan propagates CONFIG_KASAN_SHADOW_OFFSET into
KASAN_SHADOW_OFFSET, but only does so for CONFIG_KASAN_GENERIC.
Since commit:
6bd1d0be0e ("arm64: kasan: Switch to using KASAN_SHADOW_OFFSET")
... arm64 defines CONFIG_KASAN_SHADOW_OFFSET in Kconfig rather than
defining KASAN_SHADOW_OFFSET in a Makefile. Thus, if
CONFIG_KASAN_SW_TAGS && KASAN_INLINE are selected, we get build time
splats due to KASAN_SHADOW_OFFSET not being set:
| [mark@lakrids:~/src/linux]% usellvm 8.0.1 usekorg 8.1.0 make ARCH=arm64 CROSS_COMPILE=aarch64-linux- CC=clang
| scripts/kconfig/conf --syncconfig Kconfig
| CC scripts/mod/empty.o
| clang (LLVM option parsing): for the -hwasan-mapping-offset option: '' value invalid for uint argument!
| scripts/Makefile.build:273: recipe for target 'scripts/mod/empty.o' failed
| make[1]: *** [scripts/mod/empty.o] Error 1
| Makefile:1123: recipe for target 'prepare0' failed
| make: *** [prepare0] Error 2
Let's fix this by always propagating CONFIG_KASAN_SHADOW_OFFSET into
KASAN_SHADOW_OFFSET if CONFIG_KASAN is selected, moving the existing
common definition of +CFLAGS_KASAN_NOSANITIZE to the top of
Makefile.kasan.
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Tested-by Steve Capper <steve.capper@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
51 lines
1.4 KiB
Makefile
51 lines
1.4 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
|
|
ifdef CONFIG_KASAN
|
|
CFLAGS_KASAN_NOSANITIZE := -fno-builtin
|
|
KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
|
|
endif
|
|
|
|
ifdef CONFIG_KASAN_GENERIC
|
|
|
|
ifdef CONFIG_KASAN_INLINE
|
|
call_threshold := 10000
|
|
else
|
|
call_threshold := 0
|
|
endif
|
|
|
|
CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address
|
|
|
|
cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1)))
|
|
|
|
# -fasan-shadow-offset fails without -fsanitize
|
|
CFLAGS_KASAN_SHADOW := $(call cc-option, -fsanitize=kernel-address \
|
|
-fasan-shadow-offset=$(KASAN_SHADOW_OFFSET), \
|
|
$(call cc-option, -fsanitize=kernel-address \
|
|
-mllvm -asan-mapping-offset=$(KASAN_SHADOW_OFFSET)))
|
|
|
|
ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),)
|
|
CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)
|
|
else
|
|
# Now add all the compiler specific options that are valid standalone
|
|
CFLAGS_KASAN := $(CFLAGS_KASAN_SHADOW) \
|
|
$(call cc-param,asan-globals=1) \
|
|
$(call cc-param,asan-instrumentation-with-call-threshold=$(call_threshold)) \
|
|
$(call cc-param,asan-stack=$(CONFIG_KASAN_STACK)) \
|
|
$(call cc-param,asan-instrument-allocas=1)
|
|
endif
|
|
|
|
endif # CONFIG_KASAN_GENERIC
|
|
|
|
ifdef CONFIG_KASAN_SW_TAGS
|
|
|
|
ifdef CONFIG_KASAN_INLINE
|
|
instrumentation_flags := -mllvm -hwasan-mapping-offset=$(KASAN_SHADOW_OFFSET)
|
|
else
|
|
instrumentation_flags := -mllvm -hwasan-instrument-with-calls=1
|
|
endif
|
|
|
|
CFLAGS_KASAN := -fsanitize=kernel-hwaddress \
|
|
-mllvm -hwasan-instrument-stack=0 \
|
|
$(instrumentation_flags)
|
|
|
|
endif # CONFIG_KASAN_SW_TAGS
|