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1 # SPDX-License-Identifier: GPL-2.0-only
2 config ARCH_HAS_UBSAN_SANITIZE_ALL
3 bool
4
5 menuconfig UBSAN
6 bool "Undefined behaviour sanity checker"
7 help
8 This option enables the Undefined Behaviour sanity checker.
9 Compile-time instrumentation is used to detect various undefined
10 behaviours at runtime. For more details, see:
11 Documentation/dev-tools/ubsan.rst
12
13 if UBSAN
14
15 config UBSAN_TRAP
16 bool "On Sanitizer warnings, abort the running kernel code"
17 depends on $(cc-option, -fsanitize-undefined-trap-on-error)
18 help
19 Building kernels with Sanitizer features enabled tends to grow
20 the kernel size by around 5%, due to adding all the debugging
21 text on failure paths. To avoid this, Sanitizer instrumentation
22 can just issue a trap. This reduces the kernel size overhead but
23 turns all warnings (including potentially harmless conditions)
24 into full exceptions that abort the running kernel code
25 (regardless of context, locks held, etc), which may destabilize
26 the system. For some system builders this is an acceptable
27 trade-off.
28
29 config UBSAN_BOUNDS
30 bool "Perform array index bounds checking"
31 default UBSAN
32 help
33 This option enables detection of directly indexed out of bounds
34 array accesses, where the array size is known at compile time.
35 Note that this does not protect array overflows via bad calls
36 to the {str,mem}*cpy() family of functions (that is addressed
37 by CONFIG_FORTIFY_SOURCE).
38
39 config UBSAN_MISC
40 bool "Enable all other Undefined Behavior sanity checks"
41 default UBSAN
42 help
43 This option enables all sanity checks that don't have their
44 own Kconfig options. Disable this if you only want to have
45 individually selected checks.
46
47 config UBSAN_SANITIZE_ALL
48 bool "Enable instrumentation for the entire kernel"
49 depends on ARCH_HAS_UBSAN_SANITIZE_ALL
50
51 # We build with -Wno-maybe-uninitilzed, but we still want to
52 # use -Wmaybe-uninitilized in allmodconfig builds.
53 # So dependsy bellow used to disable this option in allmodconfig
54 depends on !COMPILE_TEST
55 default y
56 help
57 This option activates instrumentation for the entire kernel.
58 If you don't enable this option, you have to explicitly specify
59 UBSAN_SANITIZE := y for the files/directories you want to check for UB.
60 Enabling this option will get kernel image size increased
61 significantly.
62
63 config UBSAN_NO_ALIGNMENT
64 bool "Disable checking of pointers alignment"
65 default y if HAVE_EFFICIENT_UNALIGNED_ACCESS
66 help
67 This option disables the check of unaligned memory accesses.
68 This option should be used when building allmodconfig.
69 Disabling this option on architectures that support unaligned
70 accesses may produce a lot of false positives.
71
72 config UBSAN_ALIGNMENT
73 def_bool !UBSAN_NO_ALIGNMENT
74
75 config TEST_UBSAN
76 tristate "Module for testing for undefined behavior detection"
77 depends on m
78 help
79 This is a test module for UBSAN.
80 It triggers various undefined behavior, and detect it.
81
82 endif # if UBSAN