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This prevents the EC from returning a stale hash. BUG=chrome-os-partner:16668 BRANCH=link,snow TEST=manual, with WP disabled From EC console - Boot system and wait a second - hash --> prints valid hash - flasherase 0x20000 0x1000 - hash --> invalid - hash rw - hash --> prints valid hash - flashwrite 0x20000 0x1000 - hash --> invalid - hash rw - flasherase 0x38000 0x1000 - flashwrite 0x38000 0x1000 - hash --> still valid (since 0x38000 is outside the rw section) From root shell - ectool hash --> prints valid hash - ectool flasherase 0x20000 0x1000 - ectool hash --> invalid - ectool hash recalc RW - ectool hash --> prints valid hash - echo 'Making a hash of this' > /tmp/hashofthis - ectool flashwrite 0x20000 /tmp/hashofthis - ectool hash --> invalid - ectool hash recalc RW - ectool flasherase 0x38000 0x1000 - ectool flashwrite 0x38000 /tmp/hashofthis - ectool hash --> still valid (since 0x38000 is outside the rw section) Change-Id: Id915a504a7bc70b8b8c339b5ce55dc5bad5838fe Signed-off-by: Randall Spangler <rspangler@chromium.org> Reviewed-on: https://gerrit.chromium.org/gerrit/39484 Reviewed-by: Bill Richardson <wfrichar@chromium.org>
24 lines
642 B
C
24 lines
642 B
C
/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* Verified boot hashing memory module for Chrome EC */
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#ifndef __CROS_EC_VBOOT_HASH_H
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#define __CROS_EC_VBOOT_HASH_H
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#include "common.h"
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/**
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* Invalidate the hash if the hashed data overlaps the specified region.
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*
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* @param offset Region start offset in flash
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* @param size Size of region in bytes
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*
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* @return non-zero if the region overlapped the hashed region.
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*/
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int vboot_hash_invalidate(int offset, int size);
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#endif /* __CROS_EC_VBOOT_HASH_H */
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