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 CFLAGS_KASAN := $(call cc-option, -fsanitize=kernel-address \
  14                 -fasan-shadow-offset=$(KASAN_SHADOW_OFFSET) \
  15                 --param asan-stack=1 --param asan-globals=1 \
  16                 --param asan-instrumentation-with-call-threshold=$(call_threshold))
  17
  18 ifeq ($(call cc-option, $(CFLAGS_KASAN_MINIMAL) -Werror),)
  19    ifneq ($(CONFIG_COMPILE_TEST),y)
  20         $(warning Cannot use CONFIG_KASAN: \
  21             -fsanitize=kernel-address is not supported by compiler)
  22    endif
  23 else
  24     ifeq ($(CFLAGS_KASAN),)
  25         ifneq ($(CONFIG_COMPILE_TEST),y)
  26             $(warning CONFIG_KASAN: compiler does not support all options.\
  27                 Trying minimal configuration)
  28         endif
  29         CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)
  30     endif
  31 endif
  32
  33 ifdef CONFIG_KASAN_EXTRA
  34 CFLAGS_KASAN += $(call cc-option, -fsanitize-address-use-after-scope)
  35 endif
  36
  37 CFLAGS_KASAN_NOSANITIZE := -fno-builtin
  38
  39 endif