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

 1# SPDX-License-Identifier: GPL-2.0
 2CFLAGS_KASAN_NOSANITIZE := -fno-builtin
 3KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
 4
 5cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1)))
 6
 7ifdef CONFIG_KASAN_STACK
 8	stack_enable := 1
 9else
10	stack_enable := 0
11endif
12
13ifdef CONFIG_KASAN_GENERIC
14
15ifdef CONFIG_KASAN_INLINE
16	call_threshold := 10000
17else
18	call_threshold := 0
19endif
20
 
 
21CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address
22
23# -fasan-shadow-offset fails without -fsanitize
24CFLAGS_KASAN_SHADOW := $(call cc-option, -fsanitize=kernel-address \
25			-fasan-shadow-offset=$(KASAN_SHADOW_OFFSET), \
26			$(call cc-option, -fsanitize=kernel-address \
27			-mllvm -asan-mapping-offset=$(KASAN_SHADOW_OFFSET)))
28
29ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),)
30	CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)
 
 
31else
32	# Now add all the compiler specific options that are valid standalone
33	CFLAGS_KASAN := $(CFLAGS_KASAN_SHADOW) \
34	 $(call cc-param,asan-globals=1) \
35	 $(call cc-param,asan-instrumentation-with-call-threshold=$(call_threshold)) \
36	 $(call cc-param,asan-instrument-allocas=1)
 
 
37endif
38
39CFLAGS_KASAN += $(call cc-param,asan-stack=$(stack_enable))
40
41endif # CONFIG_KASAN_GENERIC
42
43ifdef CONFIG_KASAN_SW_TAGS
44
45ifdef CONFIG_KASAN_INLINE
46    instrumentation_flags := $(call cc-param,hwasan-mapping-offset=$(KASAN_SHADOW_OFFSET))
47else
48    instrumentation_flags := $(call cc-param,hwasan-instrument-with-calls=1)
49endif
50
51CFLAGS_KASAN := -fsanitize=kernel-hwaddress \
52		$(call cc-param,hwasan-instrument-stack=$(stack_enable)) \
53		$(call cc-param,hwasan-use-short-granules=0) \
54		$(call cc-param,hwasan-inline-all-checks=0) \
55		$(instrumentation_flags)
56
57endif # CONFIG_KASAN_SW_TAGS
58
59export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE