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=1) \
  30          $(call cc-param,asan-use-after-scope=1) \
  31          $(call cc-param,asan-instrument-allocas=1)
  32 endif
  33
  34 ifdef CONFIG_KASAN_EXTRA
  35 CFLAGS_KASAN += $(call cc-option, -fsanitize-address-use-after-scope)
  36 endif
  37
  38 endif # CONFIG_KASAN_GENERIC
  39
  40 ifdef CONFIG_KASAN_SW_TAGS
  41
  42 ifdef CONFIG_KASAN_INLINE
  43     instrumentation_flags := -mllvm -hwasan-mapping-offset=$(KASAN_SHADOW_OFFSET)
  44 else
  45     instrumentation_flags := -mllvm -hwasan-instrument-with-calls=1
  46 endif
  47
  48 CFLAGS_KASAN := -fsanitize=kernel-hwaddress \
  49                 -mllvm -hwasan-instrument-stack=0 \
  50                 $(instrumentation_flags)
  51
  52 endif # CONFIG_KASAN_SW_TAGS
  53
  54 ifdef CONFIG_KASAN
  55 CFLAGS_KASAN_NOSANITIZE := -fno-builtin
  56 endif