1#!/bin/bash 2# 3# Test case for image corruption (overlapping data structures) in qcow2 4# 5# Copyright (C) 2013 Red Hat, Inc. 6# 7# This program is free software; you can redistribute it and/or modify 8# it under the terms of the GNU General Public License as published by 9# the Free Software Foundation; either version 2 of the License, or 10# (at your option) any later version. 11# 12# This program is distributed in the hope that it will be useful, 13# but WITHOUT ANY WARRANTY; without even the implied warranty of 14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15# GNU General Public License for more details. 16# 17# You should have received a copy of the GNU General Public License 18# along with this program. If not, see <http://www.gnu.org/licenses/>. 19# 20 21# creator 22owner=mreitz@redhat.com 23 24seq=`basename $0` 25echo "QA output created by $seq" 26 27here=`pwd` 28tmp=/tmp/$$ 29status=1 # failure is the default! 30 31_cleanup() 32{ 33 _cleanup_test_img 34} 35trap "_cleanup; exit \$status" 0 1 2 3 15 36 37# get standard environment, filters and checks 38. ./common.rc 39. ./common.filter 40 41# This tests qocw2-specific low-level functionality 42_supported_fmt qcow2 43_supported_proto generic 44_supported_os Linux 45 46rt_offset=65536 # 0x10000 (XXX: just an assumption) 47rb_offset=131072 # 0x20000 (XXX: just an assumption) 48l1_offset=196608 # 0x30000 (XXX: just an assumption) 49l2_offset=262144 # 0x40000 (XXX: just an assumption) 50 51IMGOPTS="compat=1.1" 52 53echo 54echo "=== Testing L2 reference into L1 ===" 55echo 56_make_test_img 64M 57# Link first L1 entry (first L2 table) onto itself 58# (Note the MSb in the L1 entry is set, ensuring the refcount is one - else any 59# later write will result in a COW operation, effectively ruining this attempt 60# on image corruption) 61poke_file "$TEST_IMG" "$l1_offset" "\x80\x00\x00\x00\x00\x03\x00\x00" 62_check_test_img 63 64# The corrupt bit should not be set anyway 65./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features 66 67# Try to write something, thereby forcing the corrupt bit to be set 68$QEMU_IO -c "write -P 0x2a 0 512" "$TEST_IMG" | _filter_qemu_io 69 70# The corrupt bit must now be set 71./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features 72 73# Try to open the image R/W (which should fail) 74$QEMU_IO -c "read 0 512" "$TEST_IMG" 2>&1 | _filter_qemu_io | sed -e "s/can't open device .*$/can't open device/" 75 76# Try to open it RO (which should succeed) 77$QEMU_IO -c "read 0 512" -r "$TEST_IMG" | _filter_qemu_io 78 79# We could now try to fix the image, but this would probably fail (how should an 80# L2 table linked onto the L1 table be fixed?) 81 82echo 83echo "=== Testing cluster data reference into refcount block ===" 84echo 85_make_test_img 64M 86# Allocate L2 table 87truncate -s "$(($l2_offset+65536))" "$TEST_IMG" 88poke_file "$TEST_IMG" "$l1_offset" "\x80\x00\x00\x00\x00\x04\x00\x00" 89# Mark cluster as used 90poke_file "$TEST_IMG" "$(($rb_offset+8))" "\x00\x01" 91# Redirect new data cluster onto refcount block 92poke_file "$TEST_IMG" "$l2_offset" "\x80\x00\x00\x00\x00\x02\x00\x00" 93_check_test_img 94./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features 95$QEMU_IO -c "write -P 0x2a 0 512" "$TEST_IMG" | _filter_qemu_io 96./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features 97 98# Try to fix it 99_check_test_img -r all 100 101# The corrupt bit should be cleared 102./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features 103 104# Look if it's really really fixed 105$QEMU_IO -c "write -P 0x2a 0 512" "$TEST_IMG" | _filter_qemu_io 106./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features 107 108# success, all done 109echo "*** done" 110rm -f $seq.full 111status=0 112