scripts/Makefile.kasan

   1 # SPDX-License-Identifier: GPL-2.0
   2 ifdef CONFIG_KASAN
   3 ifdef CONFIG_KASAN_INLINE
   4         call_threshold := 10000
   5 else
   6         call_threshold := 0
   7 endif
   8
   9 KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
  10
  11 CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address
  12
  13 cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1)))
  14
  15 ifeq ($(call cc-option, $(CFLAGS_KASAN_MINIMAL) -Werror),)
  16    ifneq ($(CONFIG_COMPILE_TEST),y)
  17         $(warning Cannot use CONFIG_KASAN: \
  18             -fsanitize=kernel-address is not supported by compiler)
  19    endif
  20 else
  21    # -fasan-shadow-offset fails without -fsanitize
  22    CFLAGS_KASAN_SHADOW := $(call cc-option, -fsanitize=kernel-address \
  23                         -fasan-shadow-offset=$(KASAN_SHADOW_OFFSET), \
  24                         $(call cc-option, -fsanitize=kernel-address \
  25                         -mllvm -asan-mapping-offset=$(KASAN_SHADOW_OFFSET)))
  26
  27    ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),)
  28       CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)
  29    else
  30       # Now add all the compiler specific options that are valid standalone
  31       CFLAGS_KASAN := $(CFLAGS_KASAN_SHADOW) \
  32         $(call cc-param,asan-globals=1) \
  33         $(call cc-param,asan-instrumentation-with-call-threshold=$(call_threshold)) \
  34         $(call cc-param,asan-stack=1) \
  35         $(call cc-param,asan-use-after-scope=1) \
  36         $(call cc-param,asan-instrument-allocas=1)
  37    endif
  38
  39 endif
  40
  41 ifdef CONFIG_KASAN_EXTRA
  42 CFLAGS_KASAN += $(call cc-option, -fsanitize-address-use-after-scope)
  43 endif
  44
  45 CFLAGS_KASAN_NOSANITIZE := -fno-builtin
  46
  47 endif