1# SPDX-License-Identifier: GPL-2.0-only 2config HAVE_ARCH_KMSAN 3 bool 4 5config HAVE_KMSAN_COMPILER 6 def_bool CC_IS_CLANG 7 8config KMSAN 9 bool "KMSAN: detector of uninitialized values use" 10 depends on HAVE_ARCH_KMSAN && HAVE_KMSAN_COMPILER 11 depends on DEBUG_KERNEL && !KASAN && !KCSAN 12 depends on !PREEMPT_RT 13 select STACKDEPOT 14 select STACKDEPOT_ALWAYS_INIT 15 help 16 KernelMemorySanitizer (KMSAN) is a dynamic detector of uses of 17 uninitialized values in the kernel. It is based on compiler 18 instrumentation provided by Clang and thus requires Clang to build. 19 20 An important note is that KMSAN is not intended for production use, 21 because it drastically increases kernel memory footprint and slows 22 the whole system down. 23 24 See <file:Documentation/dev-tools/kmsan.rst> for more details. 25 26if KMSAN 27 28config KMSAN_CHECK_PARAM_RETVAL 29 bool "Check for uninitialized values passed to and returned from functions" 30 default y 31 help 32 If the compiler supports -fsanitize-memory-param-retval, KMSAN will 33 eagerly check every function parameter passed by value and every 34 function return value. 35 36 Disabling KMSAN_CHECK_PARAM_RETVAL will result in tracking shadow for 37 function parameters and return values across function borders. This 38 is a more relaxed mode, but it generates more instrumentation code and 39 may potentially report errors in corner cases when non-instrumented 40 functions call instrumented ones. 41 42config KMSAN_KUNIT_TEST 43 tristate "KMSAN integration test suite" if !KUNIT_ALL_TESTS 44 default KUNIT_ALL_TESTS 45 depends on TRACEPOINTS && KUNIT 46 help 47 Test suite for KMSAN, testing various error detection scenarios, 48 and checking that reports are correctly output to console. 49 50 Say Y here if you want the test to be built into the kernel and run 51 during boot; say M if you want the test to build as a module; say N 52 if you are unsure. 53 54endif 55