1# SPDX-License-Identifier: GPL-2.0 2ifdef CONFIG_KASAN 3CFLAGS_KASAN_NOSANITIZE := -fno-builtin 4KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET) 5endif 6 7ifdef CONFIG_KASAN_GENERIC 8 9ifdef CONFIG_KASAN_INLINE 10 call_threshold := 10000 11else 12 call_threshold := 0 13endif 14 15CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address 16 17cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1))) 18 19# -fasan-shadow-offset fails without -fsanitize 20CFLAGS_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))) 24 25ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),) 26 CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL) 27else 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 $(call cc-param,asan-instrument-allocas=1) 34endif 35 36endif # CONFIG_KASAN_GENERIC 37 38ifdef CONFIG_KASAN_SW_TAGS 39 40ifdef CONFIG_KASAN_INLINE 41 instrumentation_flags := -mllvm -hwasan-mapping-offset=$(KASAN_SHADOW_OFFSET) 42else 43 instrumentation_flags := -mllvm -hwasan-instrument-with-calls=1 44endif 45 46CFLAGS_KASAN := -fsanitize=kernel-hwaddress \ 47 -mllvm -hwasan-instrument-stack=0 \ 48 $(instrumentation_flags) 49 50endif # CONFIG_KASAN_SW_TAGS 51