1 # SPDX-License-Identifier: GPL-2.0
3 ifdef CONFIG_KASAN_INLINE
4 call_threshold := 10000
9 KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
11 CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address
13 cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1)))
15 ifeq ($(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)
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)))
27 ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),)
28 CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)
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)
41 ifdef CONFIG_KASAN_EXTRA
42 CFLAGS_KASAN += $(call cc-option, -fsanitize-address-use-after-scope)
45 CFLAGS_KASAN_NOSANITIZE := -fno-builtin