scripts/Makefile.kasan

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