112 lines
3.5 KiB
Plaintext
112 lines
3.5 KiB
Plaintext
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#!/bin/bash
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#
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# Test case for image corruption (overlapping data structures) in qcow2
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#
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# Copyright (C) 2013 Red Hat, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# creator
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owner=mreitz@redhat.com
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seq=`basename $0`
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echo "QA output created by $seq"
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here=`pwd`
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tmp=/tmp/$$
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status=1 # failure is the default!
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_cleanup()
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{
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_cleanup_test_img
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}
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trap "_cleanup; exit \$status" 0 1 2 3 15
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# get standard environment, filters and checks
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. ./common.rc
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. ./common.filter
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# This tests qocw2-specific low-level functionality
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_supported_fmt qcow2
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_supported_proto generic
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_supported_os Linux
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rt_offset=65536 # 0x10000 (XXX: just an assumption)
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rb_offset=131072 # 0x20000 (XXX: just an assumption)
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l1_offset=196608 # 0x30000 (XXX: just an assumption)
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l2_offset=262144 # 0x40000 (XXX: just an assumption)
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IMGOPTS="compat=1.1"
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echo
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echo "=== Testing L2 reference into L1 ==="
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echo
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_make_test_img 64M
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# Link first L1 entry (first L2 table) onto itself
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# (Note the MSb in the L1 entry is set, ensuring the refcount is one - else any
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# later write will result in a COW operation, effectively ruining this attempt
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# on image corruption)
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poke_file "$TEST_IMG" "$l1_offset" "\x80\x00\x00\x00\x00\x03\x00\x00"
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_check_test_img
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# The corrupt bit should not be set anyway
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./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
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# Try to write something, thereby forcing the corrupt bit to be set
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$QEMU_IO -c "write -P 0x2a 0 512" "$TEST_IMG" | _filter_qemu_io
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# The corrupt bit must now be set
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./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
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# Try to open the image R/W (which should fail)
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$QEMU_IO -c "read 0 512" "$TEST_IMG" 2>&1 | _filter_qemu_io | sed -e "s/can't open device .*$/can't open device/"
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# Try to open it RO (which should succeed)
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$QEMU_IO -c "read 0 512" -r "$TEST_IMG" | _filter_qemu_io
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# We could now try to fix the image, but this would probably fail (how should an
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# L2 table linked onto the L1 table be fixed?)
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echo
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echo "=== Testing cluster data reference into refcount block ==="
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echo
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_make_test_img 64M
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# Allocate L2 table
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truncate -s "$(($l2_offset+65536))" "$TEST_IMG"
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poke_file "$TEST_IMG" "$l1_offset" "\x80\x00\x00\x00\x00\x04\x00\x00"
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# Mark cluster as used
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poke_file "$TEST_IMG" "$(($rb_offset+8))" "\x00\x01"
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# Redirect new data cluster onto refcount block
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poke_file "$TEST_IMG" "$l2_offset" "\x80\x00\x00\x00\x00\x02\x00\x00"
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_check_test_img
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./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
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$QEMU_IO -c "write -P 0x2a 0 512" "$TEST_IMG" | _filter_qemu_io
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./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
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# Try to fix it
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_check_test_img -r all
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# The corrupt bit should be cleared
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./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
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# Look if it's really really fixed
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$QEMU_IO -c "write -P 0x2a 0 512" "$TEST_IMG" | _filter_qemu_io
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./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
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# success, all done
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echo "*** done"
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rm -f $seq.full
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status=0
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