1# SPDX-License-Identifier: GPL-2.0
 2ifdef CONFIG_KASAN
 3CFLAGS_KASAN_NOSANITIZE := -fno-builtin
 4KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
 5endif
 6
 7ifdef CONFIG_KASAN_GENERIC
 8
 9ifdef CONFIG_KASAN_INLINE
10	call_threshold := 10000
11else
12	call_threshold := 0
13endif
14
15CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address
16
17cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1)))
18
19# -fasan-shadow-offset fails without -fsanitize
20CFLAGS_KASAN_SHADOW := $(call cc-option, -fsanitize=kernel-address \
21			-fasan-shadow-offset=$(KASAN_SHADOW_OFFSET), \
22			$(call cc-option, -fsanitize=kernel-address \
23			-mllvm -asan-mapping-offset=$(KASAN_SHADOW_OFFSET)))
24
25ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),)
26	CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)
 
 
 
 
 
 
 
 
27else
28	# Now add all the compiler specific options that are valid standalone
29	CFLAGS_KASAN := $(CFLAGS_KASAN_SHADOW) \
30	 $(call cc-param,asan-globals=1) \
31	 $(call cc-param,asan-instrumentation-with-call-threshold=$(call_threshold)) \
32	 $(call cc-param,asan-stack=$(CONFIG_KASAN_STACK)) \
33	 $(call cc-param,asan-instrument-allocas=1)
 
34endif
35
36endif # CONFIG_KASAN_GENERIC
37
38ifdef CONFIG_KASAN_SW_TAGS
39
40ifdef CONFIG_KASAN_INLINE
41    instrumentation_flags := -mllvm -hwasan-mapping-offset=$(KASAN_SHADOW_OFFSET)
42else
43    instrumentation_flags := -mllvm -hwasan-instrument-with-calls=1
44endif
45
46CFLAGS_KASAN := -fsanitize=kernel-hwaddress \
47		-mllvm -hwasan-instrument-stack=$(CONFIG_KASAN_STACK) \
48		-mllvm -hwasan-use-short-granules=0 \
49		$(instrumentation_flags)
50
51endif # CONFIG_KASAN_SW_TAGS

 
 1ifdef CONFIG_KASAN
 
 
 
 
 
 
 2ifdef CONFIG_KASAN_INLINE
 3	call_threshold := 10000
 4else
 5	call_threshold := 0
 6endif
 7
 8KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
 
 
 9
10CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address
 
 
 
 
11
12CFLAGS_KASAN := $(call cc-option, -fsanitize=kernel-address \
13		-fasan-shadow-offset=$(KASAN_SHADOW_OFFSET) \
14		--param asan-stack=1 --param asan-globals=1 \
15		--param asan-instrumentation-with-call-threshold=$(call_threshold))
16
17ifeq ($(call cc-option, $(CFLAGS_KASAN_MINIMAL) -Werror),)
18   ifneq ($(CONFIG_COMPILE_TEST),y)
19        $(warning Cannot use CONFIG_KASAN: \
20            -fsanitize=kernel-address is not supported by compiler)
21   endif
22else
23    ifeq ($(CFLAGS_KASAN),)
24        ifneq ($(CONFIG_COMPILE_TEST),y)
25            $(warning CONFIG_KASAN: compiler does not support all options.\
26                Trying minimal configuration)
27        endif
28        CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)
29    endif
30endif
31
32CFLAGS_KASAN += $(call cc-option, -fsanitize-address-use-after-scope)
 
 
 
 
 
 
 
33endif