linux/scripts/Makefile.kasan
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   1# SPDX-License-Identifier: GPL-2.0
   2ifdef CONFIG_KASAN_GENERIC
   3
   4ifdef CONFIG_KASAN_INLINE
   5        call_threshold := 10000
   6else
   7        call_threshold := 0
   8endif
   9
  10KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
  11
  12CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address
  13
  14cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1)))
  15
  16# -fasan-shadow-offset fails without -fsanitize
  17CFLAGS_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
  22ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),)
  23        CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)
  24else
  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         $(call cc-param,asan-instrument-allocas=1)
  31endif
  32
  33endif # CONFIG_KASAN_GENERIC
  34
  35ifdef CONFIG_KASAN_SW_TAGS
  36
  37ifdef CONFIG_KASAN_INLINE
  38    instrumentation_flags := -mllvm -hwasan-mapping-offset=$(KASAN_SHADOW_OFFSET)
  39else
  40    instrumentation_flags := -mllvm -hwasan-instrument-with-calls=1
  41endif
  42
  43CFLAGS_KASAN := -fsanitize=kernel-hwaddress \
  44                -mllvm -hwasan-instrument-stack=0 \
  45                $(instrumentation_flags)
  46
  47endif # CONFIG_KASAN_SW_TAGS
  48
  49ifdef CONFIG_KASAN
  50CFLAGS_KASAN_NOSANITIZE := -fno-builtin
  51endif
  52