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725c4d22bb
Some architectures use a hardware defined structure at address zero. Checking for a null pointer will result in many ubsan reports. Allow users to disable the null sanitizer. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
48 lines
1.5 KiB
Plaintext
48 lines
1.5 KiB
Plaintext
config ARCH_HAS_UBSAN_SANITIZE_ALL
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bool
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config ARCH_WANTS_UBSAN_NO_NULL
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def_bool n
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config UBSAN
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bool "Undefined behaviour sanity checker"
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help
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This option enables undefined behaviour sanity checker
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Compile-time instrumentation is used to detect various undefined
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behaviours in runtime. Various types of checks may be enabled
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via boot parameter ubsan_handle (see: Documentation/ubsan.txt).
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config UBSAN_SANITIZE_ALL
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bool "Enable instrumentation for the entire kernel"
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depends on UBSAN
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depends on ARCH_HAS_UBSAN_SANITIZE_ALL
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# We build with -Wno-maybe-uninitilzed, but we still want to
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# use -Wmaybe-uninitilized in allmodconfig builds.
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# So dependsy bellow used to disable this option in allmodconfig
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depends on !COMPILE_TEST
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default y
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help
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This option activates instrumentation for the entire kernel.
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If you don't enable this option, you have to explicitly specify
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UBSAN_SANITIZE := y for the files/directories you want to check for UB.
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Enabling this option will get kernel image size increased
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significantly.
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config UBSAN_ALIGNMENT
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bool "Enable checking of pointers alignment"
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depends on UBSAN
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default y if !HAVE_EFFICIENT_UNALIGNED_ACCESS
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help
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This option enables detection of unaligned memory accesses.
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Enabling this option on architectures that support unaligned
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accesses may produce a lot of false positives.
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config UBSAN_NULL
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bool "Enable checking of null pointers"
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depends on UBSAN
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default y if !ARCH_WANTS_UBSAN_NO_NULL
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help
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This option enables detection of memory accesses via a
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null pointer.
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