1 # SPDX-License-Identifier: GPL-2.0
2 CFLAGS_KASAN_NOSANITIZE := -fno-builtin
3 KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
5 cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1)))
7 ifdef CONFIG_KASAN_STACK
13 ifdef CONFIG_KASAN_GENERIC
15 ifdef CONFIG_KASAN_INLINE
16 call_threshold := 10000
21 CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address
23 # -fasan-shadow-offset fails without -fsanitize
24 CFLAGS_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)))
29 ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),)
30 CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)
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)
39 CFLAGS_KASAN += $(call cc-param,asan-stack=$(stack_enable))
41 endif # CONFIG_KASAN_GENERIC
43 ifdef CONFIG_KASAN_SW_TAGS
45 ifdef CONFIG_KASAN_INLINE
46 instrumentation_flags := $(call cc-param,hwasan-mapping-offset=$(KASAN_SHADOW_OFFSET))
48 instrumentation_flags := $(call cc-param,hwasan-instrument-with-calls=1)
51 CFLAGS_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)
57 endif # CONFIG_KASAN_SW_TAGS
59 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE