1 # SPDX-License-Identifier: GPL-2.0 2 3 ifdef CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX 4 # Safe for compiler to generate meminstrinsic calls in uninstrumented files. 5 CFLAGS_KASAN_NOSANITIZE := 6 else 7 # Don't let compiler generate memintrinsic calls in uninstrumented files 8 # because they are instrumented. 9 CFLAGS_KASAN_NOSANITIZE := -fno-builtin 10 endif 11 12 KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET) 13 14 cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1))) 15 16 ifdef CONFIG_KASAN_STACK 17 stack_enable := 1 18 else 19 stack_enable := 0 20 endif 21 22 ifdef CONFIG_KASAN_GENERIC 23 24 ifdef CONFIG_KASAN_INLINE 25 call_threshold := 10000 26 else 27 call_threshold := 0 28 endif 29 30 CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address 31 32 # -fasan-shadow-offset fails without -fsanitize 33 CFLAGS_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 38 ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),) 39 CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL) 40 else 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) 46 endif 47 48 CFLAGS_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. 53 CFLAGS_KASAN += $(call cc-param,asan-kernel-mem-intrinsic-prefix=1) 54 55 endif # CONFIG_KASAN_GENERIC 56 57 ifdef CONFIG_KASAN_SW_TAGS 58 59 ifdef CONFIG_KASAN_INLINE 60 instrumentation_flags := $(call cc-param,hwasan-mapping-offset=$(KASAN_SHADOW_OFFSET)) 61 else 62 instrumentation_flags := $(call cc-param,hwasan-instrument-with-calls=1) 63 endif 64 65 CFLAGS_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 $(instrumentation_flags) 70 71 # Instrument memcpy/memset/memmove calls by using instrumented __hwasan_mem*(). 72 ifeq ($(call clang-min-version, 150000)$(call gcc-min-version, 130000),y) 73 CFLAGS_KASAN += $(call cc-param,hwasan-kernel-mem-intrinsic-prefix=1) 74 endif 75 76 endif # CONFIG_KASAN_SW_TAGS 77 78 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.