1# SPDX-License-Identifier: GPL-2.0 2ifdef CONFIG_KASAN_GENERIC 3 4ifdef CONFIG_KASAN_INLINE 5 call_threshold := 10000 6else 7 call_threshold := 0 8endif 9 10KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET) 11 12CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address 13 14cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1))) 15 16# -fasan-shadow-offset fails without -fsanitize 17CFLAGS_KASAN_SHADOW := $(call cc-option, -fsanitize=kernel-address \ 18 -fasan-shadow-offset=$(KASAN_SHADOW_OFFSET), \ 19 $(call cc-option, -fsanitize=kernel-address \ 20 -mllvm -asan-mapping-offset=$(KASAN_SHADOW_OFFSET))) 21 22ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),) 23 CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL) 24else 25 # Now add all the compiler specific options that are valid standalone 26 CFLAGS_KASAN := $(CFLAGS_KASAN_SHADOW) \ 27 $(call cc-param,asan-globals=1) \ 28 $(call cc-param,asan-instrumentation-with-call-threshold=$(call_threshold)) \ 29 $(call cc-param,asan-stack=1) \ 30 $(call cc-param,asan-use-after-scope=1) \ 31 $(call cc-param,asan-instrument-allocas=1) 32endif 33 34ifdef CONFIG_KASAN_EXTRA 35CFLAGS_KASAN += $(call cc-option, -fsanitize-address-use-after-scope) 36endif 37 38endif # CONFIG_KASAN_GENERIC 39 40ifdef CONFIG_KASAN_SW_TAGS 41 42ifdef CONFIG_KASAN_INLINE 43 instrumentation_flags := -mllvm -hwasan-mapping-offset=$(KASAN_SHADOW_OFFSET) 44else 45 instrumentation_flags := -mllvm -hwasan-instrument-with-calls=1 46endif 47 48CFLAGS_KASAN := -fsanitize=kernel-hwaddress \ 49 -mllvm -hwasan-instrument-stack=0 \ 50 $(instrumentation_flags) 51 52endif # CONFIG_KASAN_SW_TAGS 53 54ifdef CONFIG_KASAN 55CFLAGS_KASAN_NOSANITIZE := -fno-builtin 56endif 57