diff options
| -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 6c42061ca20e..acdc7fbdecac 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -669,6 +669,14 @@ 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 7712d887b696..220b7c6b5fb2 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 /* |