scripts/Makefile.kasan

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