This config option enables CONFIG_SLUB_DEBUG and CONFIG_PAGE_POISONING without the need to pass any boot parameters. No performance optimizations are done at the moment to reduce double initialization of memory regions. Signed-off-by: Alexander Potapenko <glider@xxxxxxxxxx> Cc: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx> Cc: James Morris <jmorris@xxxxxxxxx> Cc: "Serge E. Hallyn" <serge@xxxxxxxxxx> Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> Cc: Kostya Serebryany <kcc@xxxxxxxxxx> Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx> Cc: Kees Cook <keescook@xxxxxxxxxxxx> Cc: Sandeep Patil <sspatil@xxxxxxxxxxx> Cc: linux-security-module@xxxxxxxxxxxxxxx Cc: linux-kbuild@xxxxxxxxxxxxxxx Cc: kernel-hardening@xxxxxxxxxxxxxxxxxx --- mm/page_poison.c | 5 +++++ mm/slub.c | 2 ++ security/Kconfig.initmem | 11 +++++++++++ 3 files changed, 18 insertions(+) diff --git a/mm/page_poison.c b/mm/page_poison.c index 21d4f97cb49b..a1985f33f635 100644 --- a/mm/page_poison.c +++ b/mm/page_poison.c @@ -12,9 +12,14 @@ static bool want_page_poisoning __read_mostly; static int __init early_page_poison_param(char *buf) { +#ifdef CONFIG_INIT_ALL_HEAP + want_page_poisoning = true; + return 0; +#else if (!buf) return -EINVAL; return strtobool(buf, &want_page_poisoning); +#endif } early_param("page_poison", early_page_poison_param); diff --git a/mm/slub.c b/mm/slub.c index 1b08fbcb7e61..00e0197d3f35 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -1287,6 +1287,8 @@ static int __init setup_slub_debug(char *str) if (*str == ',') slub_debug_slabs = str + 1; out: + if (IS_ENABLED(CONFIG_INIT_ALL_HEAP)) + slub_debug |= SLAB_POISON; return 1; } diff --git a/security/Kconfig.initmem b/security/Kconfig.initmem index 27aec394365e..5ce49663777a 100644 --- a/security/Kconfig.initmem +++ b/security/Kconfig.initmem @@ -13,6 +13,17 @@ config INIT_ALL_MEMORY if INIT_ALL_MEMORY +config INIT_ALL_HEAP + bool "Initialize all heap" + depends on INIT_ALL_MEMORY + select CONFIG_PAGE_POISONING + select CONFIG_PAGE_POISONING_NO_SANITY + select CONFIG_PAGE_POISONING_ZERO + select CONFIG_SLUB_DEBUG + default y + help + Enable page poisoning and slub poisoning by default. + config INIT_ALL_STACK bool "Initialize all stack" depends on INIT_ALL_MEMORY -- 2.21.0.360.g471c308f928-goog