Merge tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm
[platform/kernel/linux-rpi.git] / scripts / Makefile.kasan
1 # SPDX-License-Identifier: GPL-2.0
2 CFLAGS_KASAN_NOSANITIZE := -fno-builtin
3 KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
4
5 cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1)))
6
7 ifdef CONFIG_KASAN_STACK
8         stack_enable := 1
9 else
10         stack_enable := 0
11 endif
12
13 ifdef CONFIG_KASAN_GENERIC
14
15 ifdef CONFIG_KASAN_INLINE
16         call_threshold := 10000
17 else
18         call_threshold := 0
19 endif
20
21 CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address
22
23 # -fasan-shadow-offset fails without -fsanitize
24 CFLAGS_KASAN_SHADOW := $(call cc-option, -fsanitize=kernel-address \
25                         -fasan-shadow-offset=$(KASAN_SHADOW_OFFSET), \
26                         $(call cc-option, -fsanitize=kernel-address \
27                         -mllvm -asan-mapping-offset=$(KASAN_SHADOW_OFFSET)))
28
29 ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),)
30         CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)
31 else
32         # Now add all the compiler specific options that are valid standalone
33         CFLAGS_KASAN := $(CFLAGS_KASAN_SHADOW) \
34          $(call cc-param,asan-globals=1) \
35          $(call cc-param,asan-instrumentation-with-call-threshold=$(call_threshold)) \
36          $(call cc-param,asan-instrument-allocas=1)
37 endif
38
39 CFLAGS_KASAN += $(call cc-param,asan-stack=$(stack_enable))
40
41 endif # CONFIG_KASAN_GENERIC
42
43 ifdef CONFIG_KASAN_SW_TAGS
44
45 ifdef CONFIG_KASAN_INLINE
46     instrumentation_flags := $(call cc-param,hwasan-mapping-offset=$(KASAN_SHADOW_OFFSET))
47 else
48     instrumentation_flags := $(call cc-param,hwasan-instrument-with-calls=1)
49 endif
50
51 CFLAGS_KASAN := -fsanitize=kernel-hwaddress \
52                 $(call cc-param,hwasan-instrument-stack=$(stack_enable)) \
53                 $(call cc-param,hwasan-use-short-granules=0) \
54                 $(call cc-param,hwasan-inline-all-checks=0) \
55                 $(instrumentation_flags)
56
57 endif # CONFIG_KASAN_SW_TAGS
58
59 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE