LXR linux/scripts/Makefile.kasan

   1# SPDX-License-Identifier: GPL-2.0
   2CFLAGS_KASAN_NOSANITIZE := -fno-builtin
   3KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
   4
   5cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1)))
   6
   7ifdef CONFIG_KASAN_STACK
   8        stack_enable := 1
   9else
  10        stack_enable := 0
  11endif
  12
  13ifdef CONFIG_KASAN_GENERIC
  14
  15ifdef CONFIG_KASAN_INLINE
  16        call_threshold := 10000
  17else
  18        call_threshold := 0
  19endif
  20
  21CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address
  22
  23# -fasan-shadow-offset fails without -fsanitize
  24CFLAGS_KASAN_SHADOW := $(call cc-option, -fsanitize=kernel-address \
  25                        -fasan-shadow-offset=$(KASAN_SHADOW_OFFSET), \
  26                        $(call cc-option, -fsanitize=kernel-address \
  27                        -mllvm -asan-mapping-offset=$(KASAN_SHADOW_OFFSET)))
  28
  29ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),)
  30        CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)
  31else
  32        # Now add all the compiler specific options that are valid standalone
  33        CFLAGS_KASAN := $(CFLAGS_KASAN_SHADOW) \
  34         $(call cc-param,asan-globals=1) \
  35         $(call cc-param,asan-instrumentation-with-call-threshold=$(call_threshold)) \
  36         $(call cc-param,asan-instrument-allocas=1)
  37endif
  38
  39CFLAGS_KASAN += $(call cc-param,asan-stack=$(stack_enable))
  40
  41endif # CONFIG_KASAN_GENERIC
  42
  43ifdef CONFIG_KASAN_SW_TAGS
  44
  45ifdef CONFIG_KASAN_INLINE
  46    instrumentation_flags := $(call cc-param,hwasan-mapping-offset=$(KASAN_SHADOW_OFFSET))
  47else
  48    instrumentation_flags := $(call cc-param,hwasan-instrument-with-calls=1)
  49endif
  50
  51CFLAGS_KASAN := -fsanitize=kernel-hwaddress \
  52                $(call cc-param,hwasan-instrument-stack=$(stack_enable)) \
  53                $(call cc-param,hwasan-use-short-granules=0) \
  54                $(call cc-param,hwasan-inline-all-checks=0) \
  55                $(instrumentation_flags)
  56
  57endif # CONFIG_KASAN_SW_TAGS
  58
  59export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE
  60