[PATCH 8/8] configs/hardening: Enable CONFIG_INIT_ON_FREE_DEFAULT_ON

[Kees Cook]

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 at kernel.org>
---
Cc: "Gustavo A. R. Silva" <gustavoars at kernel.org>
Cc: <linux-hardening at vger.kernel.org>
---
 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