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-rw-r--r--kernel/configs/hardening.config3
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/configs/hardening.config b/kernel/configs/hardening.config
index d24c2772d04d..64caaf997fc0 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