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# 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
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.
endif
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