linux-stable/lib/Kconfig.kmsan
Vlastimil Babka 2a19be61a6 mm/slab: remove CONFIG_SLAB from all Kconfig and Makefile
Remove CONFIG_SLAB, CONFIG_DEBUG_SLAB, CONFIG_SLAB_DEPRECATED and
everything in Kconfig files and mm/Makefile that depends on those. Since
SLUB is the only remaining allocator, remove the allocator choice, make
CONFIG_SLUB a "def_bool y" for now and remove all explicit dependencies
on SLUB or SLAB as it's now always enabled. Make every option's verbose
name and description refer to "the slab allocator" without refering to
the specific implementation. Do not rename the CONFIG_ option names yet.

Everything under #ifdef CONFIG_SLAB, and mm/slab.c is now dead code, all
code under #ifdef CONFIG_SLUB is now always compiled.

Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Christoph Lameter <cl@linux.com>
Acked-by: David Rientjes <rientjes@google.com>
Tested-by: David Rientjes <rientjes@google.com>
Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Tested-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
2023-12-05 11:14:40 +01:00

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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 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