1# SPDX-License-Identifier: GPL-2.0 2CFLAGS_KASAN_NOSANITIZE := -fno-builtin 3KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET) 4 5cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1))) 6 7ifdef CONFIG_KASAN_STACK 8 stack_enable := 1 9else 10 stack_enable := 0 11endif 12 13ifdef CONFIG_KASAN_GENERIC 14 15ifdef CONFIG_KASAN_INLINE 16 call_threshold := 10000 17else 18 call_threshold := 0 19endif 20 21CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address 22 23# -fasan-shadow-offset fails without -fsanitize 24CFLAGS_KASAN_SHADOW := $(call cc-option, -fsanitize=kernel-address \ 25 -fasan-shadow-offset=$(KASAN_SHADOW_OFFSET), \ 26 $(call cc-option, -fsanitize=kernel-address \ 27 -mllvm -asan-mapping-offset=$(KASAN_SHADOW_OFFSET))) 28 29ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),) 30 CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL) 31else 32 # Now add all the compiler specific options that are valid standalone 33 CFLAGS_KASAN := $(CFLAGS_KASAN_SHADOW) \ 34 $(call cc-param,asan-globals=1) \ 35 $(call cc-param,asan-instrumentation-with-call-threshold=$(call_threshold)) \ 36 $(call cc-param,asan-instrument-allocas=1) 37endif 38 39CFLAGS_KASAN += $(call cc-param,asan-stack=$(stack_enable)) 40 41endif # CONFIG_KASAN_GENERIC 42 43ifdef CONFIG_KASAN_SW_TAGS 44 45ifdef CONFIG_KASAN_INLINE 46 instrumentation_flags := $(call cc-param,hwasan-mapping-offset=$(KASAN_SHADOW_OFFSET)) 47else 48 instrumentation_flags := $(call cc-param,hwasan-instrument-with-calls=1) 49endif 50 51CFLAGS_KASAN := -fsanitize=kernel-hwaddress \ 52 $(call cc-param,hwasan-instrument-stack=$(stack_enable)) \ 53 $(call cc-param,hwasan-use-short-granules=0) \ 54 $(call cc-param,hwasan-inline-all-checks=0) \ 55 $(instrumentation_flags) 56 57endif # CONFIG_KASAN_SW_TAGS 58 59export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE 60