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1# SPDX-License-Identifier: GPL-2.0
2
3ifdef CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX
4# Safe for compiler to generate meminstrinsic calls in uninstrumented files.
5CFLAGS_KASAN_NOSANITIZE :=
6else
7# Don't let compiler generate memintrinsic calls in uninstrumented files
8# because they are instrumented.
9CFLAGS_KASAN_NOSANITIZE := -fno-builtin
10endif
11
12KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
13
14cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1)))
15
16ifdef CONFIG_KASAN_STACK
17 stack_enable := 1
18else
19 stack_enable := 0
20endif
21
22ifdef CONFIG_KASAN_GENERIC
23
24ifdef CONFIG_KASAN_INLINE
25 call_threshold := 10000
26else
27 call_threshold := 0
28endif
29
30CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address
31
32# -fasan-shadow-offset fails without -fsanitize
33CFLAGS_KASAN_SHADOW := $(call cc-option, -fsanitize=kernel-address \
34 -fasan-shadow-offset=$(KASAN_SHADOW_OFFSET), \
35 $(call cc-option, -fsanitize=kernel-address \
36 -mllvm -asan-mapping-offset=$(KASAN_SHADOW_OFFSET)))
37
38ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),)
39 CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)
40else
41 # Now add all the compiler specific options that are valid standalone
42 CFLAGS_KASAN := $(CFLAGS_KASAN_SHADOW) \
43 $(call cc-param,asan-globals=1) \
44 $(call cc-param,asan-instrumentation-with-call-threshold=$(call_threshold)) \
45 $(call cc-param,asan-instrument-allocas=1)
46endif
47
48CFLAGS_KASAN += $(call cc-param,asan-stack=$(stack_enable))
49
50# Instrument memcpy/memset/memmove calls by using instrumented __asan_mem*()
51# instead. With compilers that don't support this option, compiler-inserted
52# memintrinsics won't be checked by KASAN on GENERIC_ENTRY architectures.
53CFLAGS_KASAN += $(call cc-param,asan-kernel-mem-intrinsic-prefix=1)
54
55endif # CONFIG_KASAN_GENERIC
56
57ifdef CONFIG_KASAN_SW_TAGS
58
59ifdef CONFIG_KASAN_INLINE
60 instrumentation_flags := $(call cc-param,hwasan-mapping-offset=$(KASAN_SHADOW_OFFSET))
61else
62 instrumentation_flags := $(call cc-param,hwasan-instrument-with-calls=1)
63endif
64
65CFLAGS_KASAN := -fsanitize=kernel-hwaddress \
66 $(call cc-param,hwasan-instrument-stack=$(stack_enable)) \
67 $(call cc-param,hwasan-use-short-granules=0) \
68 $(call cc-param,hwasan-inline-all-checks=0) \
69 $(instrumentation_flags)
70
71# Instrument memcpy/memset/memmove calls by using instrumented __hwasan_mem*().
72ifeq ($(call clang-min-version, 150000)$(call gcc-min-version, 130000),y)
73CFLAGS_KASAN += $(call cc-param,hwasan-kernel-mem-intrinsic-prefix=1)
74endif
75
76endif # CONFIG_KASAN_SW_TAGS
77
78export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE
1# SPDX-License-Identifier: GPL-2.0
2ifdef CONFIG_KASAN
3CFLAGS_KASAN_NOSANITIZE := -fno-builtin
4KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
5endif
6
7ifdef CONFIG_KASAN_GENERIC
8
9ifdef CONFIG_KASAN_INLINE
10 call_threshold := 10000
11else
12 call_threshold := 0
13endif
14
15CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address
16
17cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1)))
18
19# -fasan-shadow-offset fails without -fsanitize
20CFLAGS_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
25ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),)
26 CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)
27else
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 $(call cc-param,asan-instrument-allocas=1)
34endif
35
36endif # CONFIG_KASAN_GENERIC
37
38ifdef CONFIG_KASAN_SW_TAGS
39
40ifdef CONFIG_KASAN_INLINE
41 instrumentation_flags := -mllvm -hwasan-mapping-offset=$(KASAN_SHADOW_OFFSET)
42else
43 instrumentation_flags := -mllvm -hwasan-instrument-with-calls=1
44endif
45
46CFLAGS_KASAN := -fsanitize=kernel-hwaddress \
47 -mllvm -hwasan-instrument-stack=$(CONFIG_KASAN_STACK) \
48 -mllvm -hwasan-use-short-granules=0 \
49 $(instrumentation_flags)
50
51endif # CONFIG_KASAN_SW_TAGS