| Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | # SPDX-License-Identifier: GPL-2.0 |
| Mark Rutland | 34b5560 | 2019-08-14 15:31:57 +0100 | [diff] [blame] | 2 | ifdef CONFIG_KASAN |
| 3 | CFLAGS_KASAN_NOSANITIZE := -fno-builtin |
| 4 | KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET) |
| 5 | endif |
| 6 | |
| Andrey Konovalov | 2bd926b | 2018-12-28 00:29:53 -0800 | [diff] [blame] | 7 | ifdef CONFIG_KASAN_GENERIC |
| 8 | |
| Andrey Ryabinin | 0b24bec | 2015-02-13 14:39:17 -0800 | [diff] [blame] | 9 | ifdef CONFIG_KASAN_INLINE |
| 10 | call_threshold := 10000 |
| 11 | else |
| 12 | call_threshold := 0 |
| 13 | endif |
| 14 | |
| 15 | CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address |
| 16 | |
| Andrey Ryabinin | 1a69e7c | 2018-02-06 15:36:08 -0800 | [diff] [blame] | 17 | cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1))) |
| Andrey Ryabinin | 0b24bec | 2015-02-13 14:39:17 -0800 | [diff] [blame] | 18 | |
| Andrey Konovalov | 2bd926b | 2018-12-28 00:29:53 -0800 | [diff] [blame] | 19 | # -fasan-shadow-offset fails without -fsanitize |
| 20 | CFLAGS_KASAN_SHADOW := $(call cc-option, -fsanitize=kernel-address \ |
| Andrey Ryabinin | 1a69e7c | 2018-02-06 15:36:08 -0800 | [diff] [blame] | 21 | -fasan-shadow-offset=$(KASAN_SHADOW_OFFSET), \ |
| 22 | $(call cc-option, -fsanitize=kernel-address \ |
| 23 | -mllvm -asan-mapping-offset=$(KASAN_SHADOW_OFFSET))) |
| 24 | |
| Andrey Konovalov | 2bd926b | 2018-12-28 00:29:53 -0800 | [diff] [blame] | 25 | ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),) |
| 26 | CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL) |
| 27 | else |
| 28 | # Now add all the compiler specific options that are valid standalone |
| 29 | CFLAGS_KASAN := $(CFLAGS_KASAN_SHADOW) \ |
| 30 | $(call cc-param,asan-globals=1) \ |
| 31 | $(call cc-param,asan-instrumentation-with-call-threshold=$(call_threshold)) \ |
| Arnd Bergmann | 6baec88 | 2019-02-28 16:21:58 -0800 | [diff] [blame] | 32 | $(call cc-param,asan-stack=$(CONFIG_KASAN_STACK)) \ |
| Andrey Konovalov | 2bd926b | 2018-12-28 00:29:53 -0800 | [diff] [blame] | 33 | $(call cc-param,asan-instrument-allocas=1) |
| Andrey Ryabinin | 0b24bec | 2015-02-13 14:39:17 -0800 | [diff] [blame] | 34 | endif |
| Andrey Ryabinin | c5caf21 | 2016-12-12 16:44:59 -0800 | [diff] [blame] | 35 | |
| Andrey Konovalov | 2bd926b | 2018-12-28 00:29:53 -0800 | [diff] [blame] | 36 | endif # CONFIG_KASAN_GENERIC |
| Andrey Konovalov | 0e410e1 | 2018-02-06 15:36:00 -0800 | [diff] [blame] | 37 | |
| Andrey Konovalov | 2bd926b | 2018-12-28 00:29:53 -0800 | [diff] [blame] | 38 | ifdef CONFIG_KASAN_SW_TAGS |
| 39 | |
| 40 | ifdef CONFIG_KASAN_INLINE |
| 41 | instrumentation_flags := -mllvm -hwasan-mapping-offset=$(KASAN_SHADOW_OFFSET) |
| 42 | else |
| 43 | instrumentation_flags := -mllvm -hwasan-instrument-with-calls=1 |
| 44 | endif |
| 45 | |
| 46 | CFLAGS_KASAN := -fsanitize=kernel-hwaddress \ |
| 47 | -mllvm -hwasan-instrument-stack=0 \ |
| 48 | $(instrumentation_flags) |
| 49 | |
| 50 | endif # CONFIG_KASAN_SW_TAGS |