summaryrefslogblamecommitdiff
path: root/scripts/Makefile.kasan
blob: 69552a39951d144e9af34a6b70165df175228d70 (plain) (tree)
1
2
3
4
5
6
7
8
9
10
                                  






                               

                                                    

                                                 
                                                                           

                                                          
                                   

                                                                   
        
    













                                                                                     

                                                  

        
     
 
                        
                                                                     
     


                                       
     
# SPDX-License-Identifier: GPL-2.0
ifdef CONFIG_KASAN
ifdef CONFIG_KASAN_INLINE
	call_threshold := 10000
else
	call_threshold := 0
endif

KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)

CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address

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

ifeq ($(call cc-option, $(CFLAGS_KASAN_MINIMAL) -Werror),)
   ifneq ($(CONFIG_COMPILE_TEST),y)
        $(warning Cannot use CONFIG_KASAN: \
            -fsanitize=kernel-address is not supported by compiler)
   endif
else
   # -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=1) \
	$(call cc-param,asan-use-after-scope=1) \
	$(call cc-param,asan-instrument-allocas=1)
   endif

endif

ifdef CONFIG_KASAN_EXTRA
CFLAGS_KASAN += $(call cc-option, -fsanitize-address-use-after-scope)
endif

CFLAGS_KASAN_NOSANITIZE := -fno-builtin

endif