scripts/Makefile.kasan

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