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

 
 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
 
 
 
 
 
 
 
31endif