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