| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 1 | # SPDX-License-Identifier: GPL-2.0 |
| 2 | ifdef CONFIG_KASAN_GENERIC |
| 3 | |
| 4 | ifdef CONFIG_KASAN_INLINE |
| 5 | call_threshold := 10000 |
| 6 | else |
| 7 | call_threshold := 0 |
| 8 | endif |
| 9 | |
| 10 | KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET) |
| 11 | |
| 12 | CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address |
| 13 | |
| 14 | cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1))) |
| 15 | |
| 16 | # -fasan-shadow-offset fails without -fsanitize |
| 17 | CFLAGS_KASAN_SHADOW := $(call cc-option, -fsanitize=kernel-address \ |
| 18 | -fasan-shadow-offset=$(KASAN_SHADOW_OFFSET), \ |
| 19 | $(call cc-option, -fsanitize=kernel-address \ |
| 20 | -mllvm -asan-mapping-offset=$(KASAN_SHADOW_OFFSET))) |
| 21 | |
| 22 | ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),) |
| 23 | CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL) |
| 24 | else |
| 25 | # Now add all the compiler specific options that are valid standalone |
| 26 | CFLAGS_KASAN := $(CFLAGS_KASAN_SHADOW) \ |
| 27 | $(call cc-param,asan-globals=1) \ |
| 28 | $(call cc-param,asan-instrumentation-with-call-threshold=$(call_threshold)) \ |
| 29 | $(call cc-param,asan-stack=$(CONFIG_KASAN_STACK)) \ |
| 30 | $(call cc-param,asan-instrument-allocas=1) |
| 31 | endif |
| 32 | |
| 33 | endif # CONFIG_KASAN_GENERIC |
| 34 | |
| 35 | ifdef CONFIG_KASAN_SW_TAGS |
| 36 | |
| 37 | ifdef CONFIG_KASAN_INLINE |
| 38 | instrumentation_flags := -mllvm -hwasan-mapping-offset=$(KASAN_SHADOW_OFFSET) |
| 39 | else |
| 40 | instrumentation_flags := -mllvm -hwasan-instrument-with-calls=1 |
| 41 | endif |
| 42 | |
| 43 | CFLAGS_KASAN := -fsanitize=kernel-hwaddress \ |
| 44 | -mllvm -hwasan-instrument-stack=0 \ |
| 45 | $(instrumentation_flags) |
| 46 | |
| 47 | endif # CONFIG_KASAN_SW_TAGS |
| 48 | |
| 49 | ifdef CONFIG_KASAN |
| 50 | CFLAGS_KASAN_NOSANITIZE := -fno-builtin |
| 51 | endif |