blob: c0080a98d00e023e9265a3e8b997d5181c62a448 [file] [log] [blame]
# Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import logging
import os
from autotest_lib.client.common_lib import error, utils
from autotest_lib.client.cros import verity_utils
class platform_DMVerityCorruption(verity_utils.VerityImageTest):
version = 1
def mod_zerofill_block(self, run_count, backing_path, block_size,
block_count):'mod_zerofill_block(%d, %s, %d, %d)' % (
run_count, backing_path, block_size, block_count))
dd_cmd = 'dd if=/dev/zero of=%s bs=%d seek=%d count=1'
run_count = run_count % block_count
verity_utils.system(dd_cmd % (backing_path, block_size, run_count))
def mod_Afill_hash_block(self, run_count, backing_path, block_size,
block_count):'mod_Afill_hash_block(%d, %s, %d, %d)' % (
run_count, backing_path, block_size, block_count))
with open(backing_path, 'wb') as dev: * block_size, os.SEEK_SET) * block_size, os.SEEK_CUR)
dev.write('A' * block_size)
def run_once(self):
# Ensure that basic verification is working.
# This should NOT fail.
self.mod_and_test(self.mod_nothing, 1, True)
# Corrupt the image once per block (on a per-block basis).
self.mod_and_test(self.mod_zerofill_block, self.image_blocks, False)
# Repeat except each block in the hash tree data
hash_blocks = (os.path.getsize(self.verity.hash_file) /
self.mod_and_test(self.mod_Afill_hash_block, hash_blocks, False)