Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[platform/kernel/linux-rpi.git] / scripts / Makefile.kasan
1 # SPDX-License-Identifier: GPL-2.0
2 ifdef CONFIG_KASAN
3 ifdef CONFIG_KASAN_INLINE
4         call_threshold := 10000
5 else
6         call_threshold := 0
7 endif
8
9 KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
10
11 CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address
12
13 cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1)))
14
15 ifeq ($(call cc-option, $(CFLAGS_KASAN_MINIMAL) -Werror),)
16    ifneq ($(CONFIG_COMPILE_TEST),y)
17         $(warning Cannot use CONFIG_KASAN: \
18             -fsanitize=kernel-address is not supported by compiler)
19    endif
20 else
21    # -fasan-shadow-offset fails without -fsanitize
22    CFLAGS_KASAN_SHADOW := $(call cc-option, -fsanitize=kernel-address \
23                         -fasan-shadow-offset=$(KASAN_SHADOW_OFFSET), \
24                         $(call cc-option, -fsanitize=kernel-address \
25                         -mllvm -asan-mapping-offset=$(KASAN_SHADOW_OFFSET)))
26
27    ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),)
28       CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)
29    else
30       # Now add all the compiler specific options that are valid standalone
31       CFLAGS_KASAN := $(CFLAGS_KASAN_SHADOW) \
32         $(call cc-param,asan-globals=1) \
33         $(call cc-param,asan-instrumentation-with-call-threshold=$(call_threshold)) \
34         $(call cc-param,asan-stack=1) \
35         $(call cc-param,asan-use-after-scope=1) \
36         $(call cc-param,asan-instrument-allocas=1)
37    endif
38
39 endif
40
41 ifdef CONFIG_KASAN_EXTRA
42 CFLAGS_KASAN += $(call cc-option, -fsanitize-address-use-after-scope)
43 endif
44
45 CFLAGS_KASAN_NOSANITIZE := -fno-builtin
46
47 endif