64 строки
2.3 KiB
Plaintext
64 строки
2.3 KiB
Plaintext
# 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
|