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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)
tree7b29d51cf1a26a2f243bbcaa89ac53cd6956237c /arch
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>
Diffstat (limited to 'arch')
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