Merge tag 'for-5.9-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
[linux-2.6-microblaze.git] / scripts / Makefile.kasan
1 # SPDX-License-Identifier: GPL-2.0
2 ifdef CONFIG_KASAN
3 CFLAGS_KASAN_NOSANITIZE := -fno-builtin
4 KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
5 endif
6
7 ifdef CONFIG_KASAN_GENERIC
8
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
17 cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1)))
18
19 # -fasan-shadow-offset fails without -fsanitize
20 CFLAGS_KASAN_SHADOW := $(call cc-option, -fsanitize=kernel-address \
21                         -fasan-shadow-offset=$(KASAN_SHADOW_OFFSET), \
22                         $(call cc-option, -fsanitize=kernel-address \
23                         -mllvm -asan-mapping-offset=$(KASAN_SHADOW_OFFSET)))
24
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)) \
32          $(call cc-param,asan-stack=$(CONFIG_KASAN_STACK)) \
33          $(call cc-param,asan-instrument-allocas=1)
34 endif
35
36 endif # CONFIG_KASAN_GENERIC
37
38 ifdef CONFIG_KASAN_SW_TAGS
39
40 ifdef CONFIG_KASAN_INLINE
41     instrumentation_flags := -mllvm -hwasan-mapping-offset=$(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=$(CONFIG_KASAN_STACK) \
48                 -mllvm -hwasan-use-short-granules=0 \
49                 $(instrumentation_flags)
50
51 endif # CONFIG_KASAN_SW_TAGS