linux/scripts/Makefile.kasan
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   1# SPDX-License-Identifier: GPL-2.0
   2ifdef CONFIG_KASAN
   3ifdef CONFIG_KASAN_INLINE
   4        call_threshold := 10000
   5else
   6        call_threshold := 0
   7endif
   8
   9KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
  10
  11CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address
  12
  13cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1)))
  14
  15ifeq ($(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
  20else
  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
  39endif
  40
  41ifdef CONFIG_KASAN_EXTRA
  42CFLAGS_KASAN += $(call cc-option, -fsanitize-address-use-after-scope)
  43endif
  44
  45CFLAGS_KASAN_NOSANITIZE := -fno-builtin
  46
  47endif
  48