Merge tag 'afs-next-20190507' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowel...
[sfrench/cifs-2.6.git] / scripts / Makefile.kasan
1 # SPDX-License-Identifier: GPL-2.0
2 ifdef CONFIG_KASAN_GENERIC
3
4 ifdef CONFIG_KASAN_INLINE
5         call_threshold := 10000
6 else
7         call_threshold := 0
8 endif
9
10 KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
11
12 CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address
13
14 cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1)))
15
16 # -fasan-shadow-offset fails without -fsanitize
17 CFLAGS_KASAN_SHADOW := $(call cc-option, -fsanitize=kernel-address \
18                         -fasan-shadow-offset=$(KASAN_SHADOW_OFFSET), \
19                         $(call cc-option, -fsanitize=kernel-address \
20                         -mllvm -asan-mapping-offset=$(KASAN_SHADOW_OFFSET)))
21
22 ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),)
23         CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)
24 else
25         # Now add all the compiler specific options that are valid standalone
26         CFLAGS_KASAN := $(CFLAGS_KASAN_SHADOW) \
27          $(call cc-param,asan-globals=1) \
28          $(call cc-param,asan-instrumentation-with-call-threshold=$(call_threshold)) \
29          $(call cc-param,asan-stack=$(CONFIG_KASAN_STACK)) \
30          $(call cc-param,asan-instrument-allocas=1)
31 endif
32
33 endif # CONFIG_KASAN_GENERIC
34
35 ifdef CONFIG_KASAN_SW_TAGS
36
37 ifdef CONFIG_KASAN_INLINE
38     instrumentation_flags := -mllvm -hwasan-mapping-offset=$(KASAN_SHADOW_OFFSET)
39 else
40     instrumentation_flags := -mllvm -hwasan-instrument-with-calls=1
41 endif
42
43 CFLAGS_KASAN := -fsanitize=kernel-hwaddress \
44                 -mllvm -hwasan-instrument-stack=0 \
45                 $(instrumentation_flags)
46
47 endif # CONFIG_KASAN_SW_TAGS
48
49 ifdef CONFIG_KASAN
50 CFLAGS_KASAN_NOSANITIZE := -fno-builtin
51 endif