From: Kees Cook Date: Thu, 17 Jul 2025 23:25:17 +0000 (-0700) Subject: configs/hardening: Enable CONFIG_KSTACK_ERASE X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4c56d9f7e75eb2a137584f708fa262d7e8c8a2d8;p=thirdparty%2Fkernel%2Fstable.git configs/hardening: Enable CONFIG_KSTACK_ERASE Since we can wipe the stack with both Clang and GCC plugins, enable this for the "hardening.config" for wider testing. Link: https://lore.kernel.org/r/20250717232519.2984886-12-kees@kernel.org Signed-off-by: Kees Cook --- diff --git a/kernel/configs/hardening.config b/kernel/configs/hardening.config index dd7c32fb5ac1b..d24c2772d04d7 100644 --- a/kernel/configs/hardening.config +++ b/kernel/configs/hardening.config @@ -63,6 +63,9 @@ CONFIG_INIT_ON_ALLOC_DEFAULT_ON=y # Initialize all stack variables to zero on function entry. CONFIG_INIT_STACK_ALL_ZERO=y +# Wipe kernel stack after syscall completion to reduce stale data lifetime. +CONFIG_KSTACK_ERASE=y + # Wipe RAM at reboot via EFI. For more details, see: # https://trustedcomputinggroup.org/resource/pc-client-work-group-platform-reset-attack-mitigation-specification/ # https://bugzilla.redhat.com/show_bug.cgi?id=1532058