1# SPDX-License-Identifier: GPL-2.0
 2ifdef CONFIG_KASAN
 
 
 
 
 
 
 
 
 
 
 
 
 3ifdef CONFIG_KASAN_INLINE
 4	call_threshold := 10000
 5else
 6	call_threshold := 0
 7endif
 8
 9KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
10
11CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address
12
13cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1)))
14
15ifeq ($(call cc-option, $(CFLAGS_KASAN_MINIMAL) -Werror),)
16   ifneq ($(CONFIG_COMPILE_TEST),y)
17        $(warning Cannot use CONFIG_KASAN: \
18            -fsanitize=kernel-address is not supported by compiler)
19   endif
20else
21   # -fasan-shadow-offset fails without -fsanitize
22   CFLAGS_KASAN_SHADOW := $(call cc-option, -fsanitize=kernel-address \
23			-fasan-shadow-offset=$(KASAN_SHADOW_OFFSET), \
24			$(call cc-option, -fsanitize=kernel-address \
25			-mllvm -asan-mapping-offset=$(KASAN_SHADOW_OFFSET)))
26
27   ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),)
28      CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)
29   else
30      # Now add all the compiler specific options that are valid standalone
31      CFLAGS_KASAN := $(CFLAGS_KASAN_SHADOW) \
32	$(call cc-param,asan-globals=1) \
33	$(call cc-param,asan-instrumentation-with-call-threshold=$(call_threshold)) \
34	$(call cc-param,asan-stack=1) \
35	$(call cc-param,asan-use-after-scope=1) \
36	$(call cc-param,asan-instrument-allocas=1)
37   endif
38
39endif
40
41ifdef CONFIG_KASAN_EXTRA
42CFLAGS_KASAN += $(call cc-option, -fsanitize-address-use-after-scope)
43endif
44
45CFLAGS_KASAN_NOSANITIZE := -fno-builtin
46
 
 
 
 
 
 
47endif

 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