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_ALIGNMENT
  31         bool "Enable checking of pointers alignment"
  32         depends on UBSAN
  33         default y if !HAVE_EFFICIENT_UNALIGNED_ACCESS
  34         help
  35           This option enables detection of unaligned memory accesses.
  36           Enabling this option on architectures that support unaligned
  37           accesses may produce a lot of false positives.
  38
  39 config TEST_UBSAN
  40         tristate "Module for testing for undefined behavior detection"
  41         depends on m && UBSAN
  42         help
  43           This is a test module for UBSAN.
  44           It triggers various undefined behavior, and detect it.