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authorMatthew Garrett <mjg59@google.com>2018-01-16 09:10:02 +0000
committerIngo Molnar <mingo@kernel.org>2018-01-19 09:17:41 +0100
commita5c03c31af2291f13689d11760c0b59fb70c9a5a (patch)
parent301f55b1a9177132d2b9ce8a90bf0ae4b37bb850 (diff)
x86/efi: Clarify that reset attack mitigation needs appropriate userspace
Some distributions have turned on the reset attack mitigation feature, which is designed to force the platform to clear the contents of RAM if the machine is shut down uncleanly. However, in order for the platform to be able to determine whether the shutdown was clean or not, userspace has to be configured to clear the MemoryOverwriteRequest flag on shutdown - otherwise the firmware will end up clearing RAM on every reboot, which is unnecessarily time consuming. Add some additional clarity to the kconfig text to reduce the risk of systems being configured this way. Signed-off-by: Matthew Garrett <mjg59@google.com> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-efi@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: stable@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig
index aab108e82f78..6047ed4e8a3d 100644
--- a/drivers/firmware/efi/Kconfig
+++ b/drivers/firmware/efi/Kconfig
@@ -159,7 +159,10 @@ config RESET_ATTACK_MITIGATION
using the TCG Platform Reset Attack Mitigation specification. This
protects against an attacker forcibly rebooting the system while it
still contains secrets in RAM, booting another OS and extracting the
- secrets.
+ secrets. This should only be enabled when userland is configured to
+ clear the MemoryOverwriteRequest flag on clean shutdown after secrets
+ have been evicted, since otherwise it will trigger even on clean
+ reboots.