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configs/hardening: Enable CONFIG_KSTACK_ERASE

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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 <kees@kernel.org>
This commit is contained in:
Kees Cook
2025-07-17 16:25:17 -07:00
parent 76261fc7d1
commit 4c56d9f7e7
1 changed files with 3 additions and 0 deletions
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kernel/configs/hardening.config
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@@ -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