# SPDX-License-Identifier: GPL-2.0

ifdef CONFIG_KASAN

ifdef CONFIG_KASAN_INLINE

call_threshold := 10000

else

call_threshold := 0

endif

KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)

CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address

cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1)))

ifeq ($(call cc-option, $(CFLAGS_KASAN_MINIMAL) -Werror),)

ifneq ($(CONFIG_COMPILE_TEST),y)

$(warning Cannot use CONFIG_KASAN: \

-fsanitize=kernel-address is not supported by compiler)

endif

else

# -fasan-shadow-offset fails without -fsanitize

CFLAGS_KASAN_SHADOW := $(call cc-option, -fsanitize=kernel-address \

-fasan-shadow-offset=$(KASAN_SHADOW_OFFSET), \

$(call cc-option, -fsanitize=kernel-address \

-mllvm -asan-mapping-offset=$(KASAN_SHADOW_OFFSET)))

ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),)

CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)

else

# Now add all the compiler specific options that are valid standalone

CFLAGS_KASAN := $(CFLAGS_KASAN_SHADOW) \

$(call cc-param,asan-globals=1) \

$(call cc-param,asan-instrumentation-with-call-threshold=$(call_threshold)) \

$(call cc-param,asan-stack=1) \

$(call cc-param,asan-use-after-scope=1) \

$(call cc-param,asan-instrument-allocas=1)

endif

endif

ifdef CONFIG_KASAN_EXTRA

CFLAGS_KASAN += $(call cc-option, -fsanitize-address-use-after-scope)

endif

CFLAGS_KASAN_NOSANITIZE := -fno-builtin

endif