summaryrefslogtreecommitdiffstats
path: root/scripts/Makefile.kasan
blob: 03757cc60e06c83e5dae59d5ebcce6c912e62c73 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
# SPDX-License-Identifier: GPL-2.0
ifdef CONFIG_KASAN
CFLAGS_KASAN_NOSANITIZE := -fno-builtin
KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
endif

ifdef CONFIG_KASAN_GENERIC

ifdef CONFIG_KASAN_INLINE
	call_threshold := 10000
else
	call_threshold := 0
endif

CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address

cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1)))

# -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)) \
	 $(call cc-param,asan-stack=$(CONFIG_KASAN_STACK)) \
	 $(call cc-param,asan-instrument-allocas=1)
endif

endif # CONFIG_KASAN_GENERIC

ifdef CONFIG_KASAN_SW_TAGS

ifdef CONFIG_KASAN_INLINE
    instrumentation_flags := -mllvm -hwasan-mapping-offset=$(KASAN_SHADOW_OFFSET)
else
    instrumentation_flags := -mllvm -hwasan-instrument-with-calls=1
endif

CFLAGS_KASAN := -fsanitize=kernel-hwaddress \
		-mllvm -hwasan-instrument-stack=0 \
		$(instrumentation_flags)

endif # CONFIG_KASAN_SW_TAGS