1 # SPDX-License-Identifier: GPL-2.0
3 CFLAGS_KASAN_NOSANITIZE := -fno-builtin
4 KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
7 ifdef CONFIG_KASAN_GENERIC
9 ifdef CONFIG_KASAN_INLINE
10 call_threshold := 10000
15 CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address
17 cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1)))
19 # -fasan-shadow-offset fails without -fsanitize
20 CFLAGS_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)))
25 ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),)
26 CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)
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 $(call cc-param,asan-instrument-allocas=1)
36 endif # CONFIG_KASAN_GENERIC
38 ifdef CONFIG_KASAN_SW_TAGS
40 ifdef CONFIG_KASAN_INLINE
41 instrumentation_flags := -mllvm -hwasan-mapping-offset=$(KASAN_SHADOW_OFFSET)
43 instrumentation_flags := -mllvm -hwasan-instrument-with-calls=1
46 CFLAGS_KASAN := -fsanitize=kernel-hwaddress \
47 -mllvm -hwasan-instrument-stack=$(CONFIG_KASAN_STACK) \
48 -mllvm -hwasan-use-short-granules=0 \
49 $(instrumentation_flags)
51 endif # CONFIG_KASAN_SW_TAGS