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2a19be61a6
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>
63 lines
2.3 KiB
Text
63 lines
2.3 KiB
Text
# SPDX-License-Identifier: GPL-2.0-only
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config HAVE_ARCH_KMSAN
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bool
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config HAVE_KMSAN_COMPILER
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# Clang versions <14.0.0 also support -fsanitize=kernel-memory, but not
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# all the features necessary to build the kernel with KMSAN.
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depends on CC_IS_CLANG && CLANG_VERSION >= 140000
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def_bool $(cc-option,-fsanitize=kernel-memory -mllvm -msan-disable-checks=1)
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config KMSAN
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bool "KMSAN: detector of uninitialized values use"
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depends on HAVE_ARCH_KMSAN && HAVE_KMSAN_COMPILER
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depends on DEBUG_KERNEL && !KASAN && !KCSAN
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depends on !PREEMPT_RT
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select STACKDEPOT
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select STACKDEPOT_ALWAYS_INIT
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help
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KernelMemorySanitizer (KMSAN) is a dynamic detector of uses of
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uninitialized values in the kernel. It is based on compiler
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instrumentation provided by Clang and thus requires Clang to build.
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An important note is that KMSAN is not intended for production use,
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because it drastically increases kernel memory footprint and slows
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the whole system down.
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See <file:Documentation/dev-tools/kmsan.rst> for more details.
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if KMSAN
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config HAVE_KMSAN_PARAM_RETVAL
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# -fsanitize-memory-param-retval is supported only by Clang >= 14.
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depends on HAVE_KMSAN_COMPILER
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def_bool $(cc-option,-fsanitize=kernel-memory -fsanitize-memory-param-retval)
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config KMSAN_CHECK_PARAM_RETVAL
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bool "Check for uninitialized values passed to and returned from functions"
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default y
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depends on HAVE_KMSAN_PARAM_RETVAL
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help
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If the compiler supports -fsanitize-memory-param-retval, KMSAN will
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eagerly check every function parameter passed by value and every
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function return value.
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Disabling KMSAN_CHECK_PARAM_RETVAL will result in tracking shadow for
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function parameters and return values across function borders. This
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is a more relaxed mode, but it generates more instrumentation code and
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may potentially report errors in corner cases when non-instrumented
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functions call instrumented ones.
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config KMSAN_KUNIT_TEST
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tristate "KMSAN integration test suite" if !KUNIT_ALL_TESTS
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default KUNIT_ALL_TESTS
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depends on TRACEPOINTS && KUNIT
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help
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Test suite for KMSAN, testing various error detection scenarios,
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and checking that reports are correctly output to console.
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Say Y here if you want the test to be built into the kernel and run
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during boot; say M if you want the test to build as a module; say N
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if you are unsure.
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endif
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