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Edit file: /usr/src/kernels/5.14.0-427.31.1.el9_4.x86_64/mm/Kconfig.debug
# SPDX-License-Identifier: GPL-2.0-only config PAGE_EXTENSION bool "Extend memmap on extra space for more information on page" help Extend memmap on extra space for more information on page. This could be used for debugging features that need to insert extra field for every page. This extension enables us to save memory by not allocating this extra memory according to boottime configuration. config DEBUG_PAGEALLOC bool "Debug page memory allocations" depends on DEBUG_KERNEL depends on !HIBERNATION || ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC select PAGE_POISONING if !ARCH_SUPPORTS_DEBUG_PAGEALLOC help Unmap pages from the kernel linear mapping after free_pages(). Depending on runtime enablement, this results in a small or large slowdown, but helps to find certain types of memory corruption. Also, the state of page tracking structures is checked more often as pages are being allocated and freed, as unexpected state changes often happen for same reasons as memory corruption (e.g. double free, use-after-free). The error reports for these checks can be augmented with stack traces of last allocation and freeing of the page, when PAGE_OWNER is also selected and enabled on boot. For architectures which don't enable ARCH_SUPPORTS_DEBUG_PAGEALLOC, fill the pages with poison patterns after free_pages() and verify the patterns before alloc_pages(). Additionally, this option cannot be enabled in combination with hibernation as that would result in incorrect warnings of memory corruption after a resume because free pages are not saved to the suspend image. By default this option will have a small overhead, e.g. by not allowing the kernel mapping to be backed by large pages on some architectures. Even bigger overhead comes when the debugging is enabled by DEBUG_PAGEALLOC_ENABLE_DEFAULT or the debug_pagealloc command line parameter. config DEBUG_PAGEALLOC_ENABLE_DEFAULT bool "Enable debug page memory allocations by default?" depends on DEBUG_PAGEALLOC help Enable debug page memory allocations by default? This value can be overridden by debug_pagealloc=off|on. config DEBUG_SLAB bool "Debug slab memory allocations" depends on DEBUG_KERNEL && SLAB help Say Y here to have the kernel do limited verification on memory allocation as well as poisoning memory on free to catch use of freed memory. This can make kmalloc/kfree-intensive workloads much slower. config SLUB_DEBUG default y bool "Enable SLUB debugging support" if EXPERT depends on SLUB && SYSFS select STACKDEPOT if STACKTRACE_SUPPORT help SLUB has extensive debug support features. Disabling these can result in significant savings in code size. This also disables SLUB sysfs support. /sys/slab will not exist and there will be no support for cache validation etc. config SLUB_DEBUG_ON bool "SLUB debugging on by default" depends on SLUB && SLUB_DEBUG select STACKDEPOT_ALWAYS_INIT if STACKTRACE_SUPPORT default n help Boot with debugging on by default. SLUB boots by default with the runtime debug capabilities switched off. Enabling this is equivalent to specifying the "slub_debug" parameter on boot. There is no support for more fine grained debug control like possible with slub_debug=xxx. SLUB debugging may be switched off in a kernel built with CONFIG_SLUB_DEBUG_ON by specifying "slub_debug=-". config PAGE_OWNER bool "Track page owner" depends on DEBUG_KERNEL && STACKTRACE_SUPPORT select DEBUG_FS select STACKTRACE select STACKDEPOT select PAGE_EXTENSION help This keeps track of what call chain is the owner of a page, may help to find bare alloc_page(s) leaks. Even if you include this feature on your build, it is disabled in default. You should pass "page_owner=on" to boot parameter in order to enable it. Eats a fair amount of memory if enabled. See tools/vm/page_owner_sort.c for user-space helper. If unsure, say N. config PAGE_TABLE_CHECK bool "Check for invalid mappings in user page tables" depends on ARCH_SUPPORTS_PAGE_TABLE_CHECK select PAGE_EXTENSION help Check that anonymous page is not being mapped twice with read write permissions. Check that anonymous and file pages are not being erroneously shared. Since the checking is performed at the time entries are added and removed to user page tables, leaking, corruption and double mapping problems are detected synchronously. If unsure say "n". config PAGE_TABLE_CHECK_ENFORCED bool "Enforce the page table checking by default" depends on PAGE_TABLE_CHECK help Always enable page table checking. By default the page table checking is disabled, and can be optionally enabled via page_table_check=on kernel parameter. This config enforces that page table check is always enabled. If unsure say "n". config PAGE_POISONING bool "Poison pages after freeing" help Fill the pages with poison patterns after free_pages() and verify the patterns before alloc_pages. The filling of the memory helps reduce the risk of information leaks from freed data. This does have a potential performance impact if enabled with the "page_poison=1" kernel boot option. Note that "poison" here is not the same thing as the "HWPoison" for CONFIG_MEMORY_FAILURE. This is software poisoning only. If you are only interested in sanitization of freed pages without checking the poison pattern on alloc, you can boot the kernel with "init_on_free=1" instead of enabling this. If unsure, say N config DEBUG_PAGE_REF bool "Enable tracepoint to track down page reference manipulation" depends on DEBUG_KERNEL depends on TRACEPOINTS help This is a feature to add tracepoint for tracking down page reference manipulation. This tracking is useful to diagnose functional failure due to migration failures caused by page reference mismatches. Be careful when enabling this feature because it adds about 30 KB to the kernel code. However the runtime performance overhead is virtually nil until the tracepoints are actually enabled. config DEBUG_RODATA_TEST bool "Testcase for the marking rodata read-only" depends on STRICT_KERNEL_RWX help This option enables a testcase for the setting rodata read-only. config ARCH_HAS_DEBUG_WX bool config DEBUG_WX bool "Warn on W+X mappings at boot" depends on ARCH_HAS_DEBUG_WX depends on MMU select PTDUMP_CORE help Generate a warning if any W+X mappings are found at boot. This is useful for discovering cases where the kernel is leaving W+X mappings after applying NX, as such mappings are a security risk. Look for a message in dmesg output like this: <arch>/mm: Checked W+X mappings: passed, no W+X pages found. or like this, if the check failed: <arch>/mm: Checked W+X mappings: failed, <N> W+X pages found. Note that even if the check fails, your kernel is possibly still fine, as W+X mappings are not a security hole in themselves, what they do is that they make the exploitation of other unfixed kernel bugs easier. There is no runtime or memory usage effect of this option once the kernel has booted up - it's a one time check. If in doubt, say "Y". config GENERIC_PTDUMP bool config PTDUMP_CORE bool config PTDUMP_DEBUGFS bool "Export kernel pagetable layout to userspace via debugfs" depends on DEBUG_KERNEL depends on DEBUG_FS depends on GENERIC_PTDUMP select PTDUMP_CORE help Say Y here if you want to show the kernel pagetable layout in a debugfs file. This information is only useful for kernel developers who are working in architecture specific areas of the kernel. It is probably not a good idea to enable this feature in a production kernel. If in doubt, say N.
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