lib/Kconfig.ubsan

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