Merge tag 'linux-watchdog-6.4-rc1' of git://www.linux-watchdog.org/linux-watchdog
[platform/kernel/linux-rpi.git] / scripts / Makefile.kasan
1 # SPDX-License-Identifier: GPL-2.0
2
3 ifdef CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX
4 # Safe for compiler to generate meminstrinsic calls in uninstrumented files.
5 CFLAGS_KASAN_NOSANITIZE :=
6 else
7 # Don't let compiler generate memintrinsic calls in uninstrumented files
8 # because they are instrumented.
9 CFLAGS_KASAN_NOSANITIZE := -fno-builtin
10 endif
11
12 KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
13
14 cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1)))
15
16 ifdef CONFIG_KASAN_STACK
17         stack_enable := 1
18 else
19         stack_enable := 0
20 endif
21
22 ifdef CONFIG_KASAN_GENERIC
23
24 ifdef CONFIG_KASAN_INLINE
25         call_threshold := 10000
26 else
27         call_threshold := 0
28 endif
29
30 CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address
31
32 # -fasan-shadow-offset fails without -fsanitize
33 CFLAGS_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
38 ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),)
39         CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)
40 else
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)
46 endif
47
48 CFLAGS_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.
53 CFLAGS_KASAN += $(call cc-param,asan-kernel-mem-intrinsic-prefix=1)
54
55 endif # CONFIG_KASAN_GENERIC
56
57 ifdef CONFIG_KASAN_SW_TAGS
58
59 ifdef CONFIG_KASAN_INLINE
60     instrumentation_flags := $(call cc-param,hwasan-mapping-offset=$(KASAN_SHADOW_OFFSET))
61 else
62     instrumentation_flags := $(call cc-param,hwasan-instrument-with-calls=1)
63 endif
64
65 CFLAGS_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                 $(instrumentation_flags)
70
71 # Instrument memcpy/memset/memmove calls by using instrumented __hwasan_mem*().
72 ifeq ($(call clang-min-version, 150000)$(call gcc-min-version, 130000),y)
73 CFLAGS_KASAN += $(call cc-param,hwasan-kernel-mem-intrinsic-prefix=1)
74 endif
75
76 endif # CONFIG_KASAN_SW_TAGS
77
78 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE