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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2025-12-07 19:56:10 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2025-12-07 19:56:10 +0300 |
| commit | 67a454e6b1c604555c04501c77b7fedc5d98a779 (patch) | |
| tree | 27bdef6681e950cecb308a31a444538734cc3150 | |
| parent | bbbf7f32843b5788786cd8d91e9430823c2777c9 (diff) | |
| parent | 83c8f7b5e194eaf3fb268c513e23e23e892de8ed (diff) | |
| download | linux-67a454e6b1c604555c04501c77b7fedc5d98a779.tar.xz | |
Merge tag 'memblock-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock
Pull memblock update from Mike Rapoport:
"Introduce a 'check_pages' boot parameter to decouple simple checks for
page state on allocation and free from CONFIG_DEBUG_VM.
This allows enabling page checking without building kernel with
CONFIG_DEBUG_VM or forcing init_on_{alloc, free} or other heavier
mechanisms"
* tag 'memblock-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock:
mm/mm_init: Introduce a boot parameter for check_pages
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 8 | ||||
| -rw-r--r-- | mm/mm_init.c | 10 |
2 files changed, 17 insertions, 1 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index b86b6d946d88..a8d0afde7f85 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -767,6 +767,14 @@ Kernel parameters nokmem -- Disable kernel memory accounting. nobpf -- Disable BPF memory accounting. + check_pages= [MM,EARLY] Enable sanity checking of pages after + allocations / before freeing. This adds checks to catch + double-frees, use-after-frees, and other sources of + page corruption by inspecting page internals (flags, + mapcount/refcount, memcg_data, etc.). + Format: { "0" | "1" } + Default: 0 (1 if CONFIG_DEBUG_VM is set) + checkreqprot= [SELINUX] Set initial checkreqprot flag value. Format: { "0" | "1" } See security/selinux/Kconfig help text. diff --git a/mm/mm_init.c b/mm/mm_init.c index c6812b4dbb2e..fc2a6f1e518f 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -2525,6 +2525,14 @@ early_param("init_on_free", early_init_on_free); DEFINE_STATIC_KEY_MAYBE(CONFIG_DEBUG_VM, check_pages_enabled); +static bool check_pages_enabled_early __initdata; + +static int __init early_check_pages(char *buf) +{ + return kstrtobool(buf, &check_pages_enabled_early); +} +early_param("check_pages", early_check_pages); + /* * Enable static keys related to various memory debugging and hardening options. * Some override others, and depend on early params that are evaluated in the @@ -2534,7 +2542,7 @@ DEFINE_STATIC_KEY_MAYBE(CONFIG_DEBUG_VM, check_pages_enabled); static void __init mem_debugging_and_hardening_init(void) { bool page_poisoning_requested = false; - bool want_check_pages = false; + bool want_check_pages = check_pages_enabled_early; #ifdef CONFIG_PAGE_POISONING /* |