lib/Kconfig.ubsan

   1 config ARCH_HAS_UBSAN_SANITIZE_ALL
   2         bool
   3
   4 config UBSAN
   5         bool "Undefined behaviour sanity checker"
   6         help
   7           This option enables undefined behaviour sanity checker
   8           Compile-time instrumentation is used to detect various undefined
   9           behaviours in runtime. Various types of checks may be enabled
  10           via boot parameter ubsan_handle
  11           (see: Documentation/dev-tools/ubsan.rst).
  12
  13 config UBSAN_SANITIZE_ALL
  14         bool "Enable instrumentation for the entire kernel"
  15         depends on UBSAN
  16         depends on ARCH_HAS_UBSAN_SANITIZE_ALL
  17
  18         # We build with -Wno-maybe-uninitilzed, but we still want to
  19         # use -Wmaybe-uninitilized in allmodconfig builds.
  20         # So dependsy bellow used to disable this option in allmodconfig
  21         depends on !COMPILE_TEST
  22         default y
  23         help
  24           This option activates instrumentation for the entire kernel.
  25           If you don't enable this option, you have to explicitly specify
  26           UBSAN_SANITIZE := y for the files/directories you want to check for UB.
  27           Enabling this option will get kernel image size increased
  28           significantly.
  29
  30 config UBSAN_NO_ALIGNMENT
  31         bool "Disable checking of pointers alignment"
  32         depends on UBSAN
  33         default y if HAVE_EFFICIENT_UNALIGNED_ACCESS
  34         help
  35           This option disables the check of unaligned memory accesses.
  36           This option should be used when building allmodconfig.
  37           Disabling this option on architectures that support unaligned
  38           accesses may produce a lot of false positives.
  39
  40 config UBSAN_ALIGNMENT
  41         def_bool !UBSAN_NO_ALIGNMENT
  42
  43 config TEST_UBSAN
  44         tristate "Module for testing for undefined behavior detection"
  45         depends on m && UBSAN
  46         help
  47           This is a test module for UBSAN.
  48           It triggers various undefined behavior, and detect it.