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Diffstat (limited to '')
| -rw-r--r-- | lib/Kconfig.kmsan | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/lib/Kconfig.kmsan b/lib/Kconfig.kmsan new file mode 100644 index 000000000..ef2c8f256 --- /dev/null +++ b/lib/Kconfig.kmsan @@ -0,0 +1,63 @@ +# SPDX-License-Identifier: GPL-2.0-only +config HAVE_ARCH_KMSAN + bool + +config HAVE_KMSAN_COMPILER + # Clang versions <14.0.0 also support -fsanitize=kernel-memory, but not + # all the features necessary to build the kernel with KMSAN. + depends on CC_IS_CLANG && CLANG_VERSION >= 140000 + def_bool $(cc-option,-fsanitize=kernel-memory -mllvm -msan-disable-checks=1) + +config KMSAN + bool "KMSAN: detector of uninitialized values use" + depends on HAVE_ARCH_KMSAN && HAVE_KMSAN_COMPILER + depends on SLUB && DEBUG_KERNEL && !KASAN && !KCSAN + depends on !PREEMPT_RT + select STACKDEPOT + select STACKDEPOT_ALWAYS_INIT + help + KernelMemorySanitizer (KMSAN) is a dynamic detector of uses of + uninitialized values in the kernel. It is based on compiler + instrumentation provided by Clang and thus requires Clang to build. + + An important note is that KMSAN is not intended for production use, + because it drastically increases kernel memory footprint and slows + the whole system down. + + See <file:Documentation/dev-tools/kmsan.rst> for more details. + +if KMSAN + +config HAVE_KMSAN_PARAM_RETVAL + # -fsanitize-memory-param-retval is supported only by Clang >= 14. + depends on HAVE_KMSAN_COMPILER + def_bool $(cc-option,-fsanitize=kernel-memory -fsanitize-memory-param-retval) + +config KMSAN_CHECK_PARAM_RETVAL + bool "Check for uninitialized values passed to and returned from functions" + default y + depends on HAVE_KMSAN_PARAM_RETVAL + help + If the compiler supports -fsanitize-memory-param-retval, KMSAN will + eagerly check every function parameter passed by value and every + function return value. + + Disabling KMSAN_CHECK_PARAM_RETVAL will result in tracking shadow for + function parameters and return values across function borders. This + is a more relaxed mode, but it generates more instrumentation code and + may potentially report errors in corner cases when non-instrumented + functions call instrumented ones. + +config KMSAN_KUNIT_TEST + tristate "KMSAN integration test suite" if !KUNIT_ALL_TESTS + default KUNIT_ALL_TESTS + depends on TRACEPOINTS && KUNIT + help + Test suite for KMSAN, testing various error detection scenarios, + and checking that reports are correctly output to console. + + Say Y here if you want the test to be built into the kernel and run + during boot; say M if you want the test to build as a module; say N + if you are unsure. + +endif |