[PATCH 8/8] configs/hardening: Enable CONFIG_INIT_ON_FREE_DEFAULT_ON
From: Kees Cook <kees@kernel.org>
Date: 2025-05-07 18:16:21
Also in:
kvmarm, linux-arm-kernel, linux-doc, linux-efi, linux-hardening, linux-kbuild, linux-kselftest, linux-riscv, linux-s390, lkml, llvm, sparclinux
Subsystem:
kernel hardening (not covered by other areas), the rest · Maintainers:
Kees Cook, Linus Torvalds
To reduce stale data lifetimes, enable CONFIG_INIT_ON_FREE_DEFAULT_ON as well. This matches the addition of CONFIG_STACKLEAK=y, which is doing similar for stack memory. Signed-off-by: Kees Cook <kees@kernel.org> --- Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org> Cc: <redacted> --- kernel/configs/hardening.config | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/kernel/configs/hardening.config b/kernel/configs/hardening.config
index 3da00926b4eb..7d92a740e490 100644
--- a/kernel/configs/hardening.config
+++ b/kernel/configs/hardening.config@@ -60,6 +60,9 @@ CONFIG_LIST_HARDENED=y # Initialize all heap variables to zero on allocation. CONFIG_INIT_ON_ALLOC_DEFAULT_ON=y +# Initialize all heap variables to zero on free to reduce stale data lifetime. +CONFIG_INIT_ON_FREE_DEFAULT_ON=y + # Initialize all stack variables to zero on function entry. CONFIG_INIT_STACK_ALL_ZERO=y
--
2.34.1