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Linux/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.

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