tree 37e80b101da6553108bb641e147b91bcf8e0a489
parent e95ceff307f6c5c457f3e805991804ae2c7cb50c
author Daisuke Nojiri <dnojiri@chromium.org> 1506639201 -0700
committer chrome-bot <chrome-bot@chromium.org> 1507263884 -0700

Check EC_IN_RW before proceeding to recovery mode

Depthcharge currently asks EC whether recovery was requested manually
or not without verifying EC is in RO or not. If EC-RW is compromised,
recovery switch state can be spoofed.

This patch makes Depthcharge check EC_IN_RW to determine whether EC
is in RO or not. Only if it's in RO and it says recovery button was
pressed at boot, we proceed to the recovery process.

All other recovery requests including manual recovery requested by a
(compromised) host will end up with 'broken' screen.

BUG=b:66516882
BRANCH=none
TEST=Boot Fizz. make runtests.

Change-Id: I01d2df05fe22e79bbc949f5cb83db605147667b3
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/693008
Reviewed-by: Randall Spangler <rspangler@chromium.org>