diff options
Diffstat (limited to 'scripts/Makefile.kasan')
| -rw-r--r-- | scripts/Makefile.kasan | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/scripts/Makefile.kasan b/scripts/Makefile.kasan new file mode 100644 index 000000000..69552a399 --- /dev/null +++ b/scripts/Makefile.kasan @@ -0,0 +1,47 @@ +# SPDX-License-Identifier: GPL-2.0 +ifdef CONFIG_KASAN +ifdef CONFIG_KASAN_INLINE + call_threshold := 10000 +else + call_threshold := 0 +endif + +KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET) + +CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address + +cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1))) + +ifeq ($(call cc-option, $(CFLAGS_KASAN_MINIMAL) -Werror),) + ifneq ($(CONFIG_COMPILE_TEST),y) + $(warning Cannot use CONFIG_KASAN: \ + -fsanitize=kernel-address is not supported by compiler) + endif +else + # -fasan-shadow-offset fails without -fsanitize + CFLAGS_KASAN_SHADOW := $(call cc-option, -fsanitize=kernel-address \ + -fasan-shadow-offset=$(KASAN_SHADOW_OFFSET), \ + $(call cc-option, -fsanitize=kernel-address \ + -mllvm -asan-mapping-offset=$(KASAN_SHADOW_OFFSET))) + + ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),) + CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL) + else + # Now add all the compiler specific options that are valid standalone + CFLAGS_KASAN := $(CFLAGS_KASAN_SHADOW) \ + $(call cc-param,asan-globals=1) \ + $(call cc-param,asan-instrumentation-with-call-threshold=$(call_threshold)) \ + $(call cc-param,asan-stack=1) \ + $(call cc-param,asan-use-after-scope=1) \ + $(call cc-param,asan-instrument-allocas=1) + endif + +endif + +ifdef CONFIG_KASAN_EXTRA +CFLAGS_KASAN += $(call cc-option, -fsanitize-address-use-after-scope) +endif + +CFLAGS_KASAN_NOSANITIZE := -fno-builtin + +endif |