1# SPDX-License-Identifier: GPL-2.0 2 3ifdef CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX 4# Safe for compiler to generate meminstrinsic calls in uninstrumented files. 5CFLAGS_KASAN_NOSANITIZE := 6else 7# Don't let compiler generate memintrinsic calls in uninstrumented files 8# because they are instrumented. 9CFLAGS_KASAN_NOSANITIZE := -fno-builtin 10endif 11 12KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET) 13 14cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1))) 15 16ifdef CONFIG_KASAN_STACK 17 stack_enable := 1 18else 19 stack_enable := 0 20endif 21 22ifdef CONFIG_KASAN_GENERIC 23 24ifdef CONFIG_KASAN_INLINE 25 call_threshold := 10000 26else 27 call_threshold := 0 28endif 29 30CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address 31 32# -fasan-shadow-offset fails without -fsanitize 33CFLAGS_KASAN_SHADOW := $(call cc-option, -fsanitize=kernel-address \ 34 -fasan-shadow-offset=$(KASAN_SHADOW_OFFSET), \ 35 $(call cc-option, -fsanitize=kernel-address \ 36 -mllvm -asan-mapping-offset=$(KASAN_SHADOW_OFFSET))) 37 38ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),) 39 CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL) 40else 41 # Now add all the compiler specific options that are valid standalone 42 CFLAGS_KASAN := $(CFLAGS_KASAN_SHADOW) \ 43 $(call cc-param,asan-globals=1) \ 44 $(call cc-param,asan-instrumentation-with-call-threshold=$(call_threshold)) \ 45 $(call cc-param,asan-instrument-allocas=1) 46endif 47 48CFLAGS_KASAN += $(call cc-param,asan-stack=$(stack_enable)) 49 50# Instrument memcpy/memset/memmove calls by using instrumented __asan_mem*() 51# instead. With compilers that don't support this option, compiler-inserted 52# memintrinsics won't be checked by KASAN on GENERIC_ENTRY architectures. 53CFLAGS_KASAN += $(call cc-param,asan-kernel-mem-intrinsic-prefix=1) 54 55endif # CONFIG_KASAN_GENERIC 56 57ifdef CONFIG_KASAN_SW_TAGS 58 59ifdef CONFIG_KASAN_INLINE 60 instrumentation_flags := $(call cc-param,hwasan-mapping-offset=$(KASAN_SHADOW_OFFSET)) 61else 62 instrumentation_flags := $(call cc-param,hwasan-instrument-with-calls=1) 63endif 64 65CFLAGS_KASAN := -fsanitize=kernel-hwaddress \ 66 $(call cc-param,hwasan-instrument-stack=$(stack_enable)) \ 67 $(call cc-param,hwasan-use-short-granules=0) \ 68 $(call cc-param,hwasan-inline-all-checks=0) \ 69 $(instrumentation_flags) 70 71# Instrument memcpy/memset/memmove calls by using instrumented __hwasan_mem*(). 72CFLAGS_KASAN += $(call cc-param,hwasan-kernel-mem-intrinsic-prefix=1) 73 74endif # CONFIG_KASAN_SW_TAGS 75 76export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE 77