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 file 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) 50l2_offset_after_snapshot=524288 # 0x80000 (XXX: just an assumption) 51 52IMGOPTS="compat=1.1" 53 54OPEN_RW="open -o overlap-check=all $TEST_IMG" 55# Overlap checks are done before write operations only, therefore opening an 56# image read-only makes the overlap-check option irrelevant 57OPEN_RO="open -r $TEST_IMG" 58 59echo 60echo "=== Testing L2 reference into L1 ===" 61echo 62_make_test_img 64M 63# Link first L1 entry (first L2 table) onto itself 64# (Note the MSb in the L1 entry is set, ensuring the refcount is one - else any 65# later write will result in a COW operation, effectively ruining this attempt 66# on image corruption) 67poke_file "$TEST_IMG" "$l1_offset" "\x80\x00\x00\x00\x00\x03\x00\x00" 68_check_test_img 69 70# The corrupt bit should not be set anyway 71$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features 72 73# Try to write something, thereby forcing the corrupt bit to be set 74$QEMU_IO -c "$OPEN_RW" -c "write -P 0x2a 0 512" | _filter_qemu_io 75 76# The corrupt bit must now be set 77$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features 78 79# This information should be available through qemu-img info 80$QEMU_IMG info "$TEST_IMG" | _filter_testdir 81 82# Try to open the image R/W (which should fail) 83$QEMU_IO -c "$OPEN_RW" -c "read 0 512" 2>&1 | _filter_qemu_io \ 84 | _filter_testdir \ 85 | _filter_imgfmt 86 87# Try to open it RO (which should succeed) 88$QEMU_IO -c "$OPEN_RO" -c "read 0 512" | _filter_qemu_io 89 90# We could now try to fix the image, but this would probably fail (how should an 91# L2 table linked onto the L1 table be fixed?) 92 93echo 94echo "=== Testing cluster data reference into refcount block ===" 95echo 96_make_test_img 64M 97# Allocate L2 table 98truncate -s "$(($l2_offset+65536))" "$TEST_IMG" 99poke_file "$TEST_IMG" "$l1_offset" "\x80\x00\x00\x00\x00\x04\x00\x00" 100# Mark cluster as used 101poke_file "$TEST_IMG" "$(($rb_offset+8))" "\x00\x01" 102# Redirect new data cluster onto refcount block 103poke_file "$TEST_IMG" "$l2_offset" "\x80\x00\x00\x00\x00\x02\x00\x00" 104_check_test_img 105$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features 106$QEMU_IO -c "$OPEN_RW" -c "write -P 0x2a 0 512" | _filter_qemu_io 107$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features 108 109# Try to fix it 110_check_test_img -r all 111 112# The corrupt bit should be cleared 113$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features 114 115# Look if it's really really fixed 116$QEMU_IO -c "$OPEN_RW" -c "write -P 0x2a 0 512" | _filter_qemu_io 117$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features 118 119echo 120echo "=== Testing cluster data reference into inactive L2 table ===" 121echo 122_make_test_img 64M 123$QEMU_IO -c "$OPEN_RW" -c "write -P 1 0 512" | _filter_qemu_io 124$QEMU_IMG snapshot -c foo "$TEST_IMG" 125$QEMU_IO -c "$OPEN_RW" -c "write -P 2 0 512" | _filter_qemu_io 126# The inactive L2 table remains at its old offset 127poke_file "$TEST_IMG" "$l2_offset_after_snapshot" \ 128 "\x80\x00\x00\x00\x00\x04\x00\x00" 129_check_test_img 130$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features 131$QEMU_IO -c "$OPEN_RW" -c "write -P 3 0 512" | _filter_qemu_io 132$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features 133_check_test_img -r all 134$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features 135$QEMU_IO -c "$OPEN_RW" -c "write -P 4 0 512" | _filter_qemu_io 136$PYTHON qcow2.py "$TEST_IMG" dump-header | grep incompatible_features 137 138# Check data 139$QEMU_IO -c "$OPEN_RO" -c "read -P 4 0 512" | _filter_qemu_io 140$QEMU_IMG snapshot -a foo "$TEST_IMG" 141_check_test_img 142$QEMU_IO -c "$OPEN_RO" -c "read -P 1 0 512" | _filter_qemu_io 143 144echo 145echo "=== Testing overlap while COW is in flight ===" 146echo 147# compat=0.10 is required in order to make the following discard actually 148# unallocate the sector rather than make it a zero sector - we want COW, after 149# all. 150IMGOPTS='compat=0.10' _make_test_img 1G 151# Write two clusters, the second one enforces creation of an L2 table after 152# the first data cluster. 153$QEMU_IO -c 'write 0k 64k' -c 'write 512M 64k' "$TEST_IMG" | _filter_qemu_io 154# Discard the first cluster. This cluster will soon enough be reallocated and 155# used for COW. 156$QEMU_IO -c 'discard 0k 64k' "$TEST_IMG" | _filter_qemu_io 157# Now, corrupt the image by marking the second L2 table cluster as free. 158poke_file "$TEST_IMG" '131084' "\x00\x00" # 0x2000c 159# Start a write operation requiring COW on the image stopping it right before 160# doing the read; then, trigger the corruption prevention by writing anything to 161# any unallocated cluster, leading to an attempt to overwrite the second L2 162# table. Finally, resume the COW write and see it fail (but not crash). 163echo "open -o file.driver=blkdebug $TEST_IMG 164break cow_read 0 165aio_write 0k 1k 166wait_break 0 167write 64k 64k 168resume 0" | $QEMU_IO | _filter_qemu_io 169 170echo 171echo "=== Testing unallocated image header ===" 172echo 173_make_test_img 64M 174# Create L1/L2 175$QEMU_IO -c "write 0 64k" "$TEST_IMG" | _filter_qemu_io 176poke_file "$TEST_IMG" "$rb_offset" "\x00\x00" 177$QEMU_IO -c "write 64k 64k" "$TEST_IMG" | _filter_qemu_io 178 179echo 180echo "=== Testing unaligned L1 entry ===" 181echo 182_make_test_img 64M 183$QEMU_IO -c "write 0 64k" "$TEST_IMG" | _filter_qemu_io 184# This will be masked with ~(512 - 1) = ~0x1ff, so whether the lower 9 bits are 185# aligned or not does not matter 186poke_file "$TEST_IMG" "$l1_offset" "\x80\x00\x00\x00\x00\x04\x2a\x00" 187$QEMU_IO -c "read 0 64k" "$TEST_IMG" | _filter_qemu_io 188 189echo 190echo "=== Testing unaligned L2 entry ===" 191echo 192_make_test_img 64M 193$QEMU_IO -c "write 0 64k" "$TEST_IMG" | _filter_qemu_io 194poke_file "$TEST_IMG" "$l2_offset" "\x80\x00\x00\x00\x00\x05\x2a\x00" 195$QEMU_IO -c "read 0 64k" "$TEST_IMG" | _filter_qemu_io 196 197echo 198echo "=== Testing unaligned reftable entry ===" 199echo 200_make_test_img 64M 201poke_file "$TEST_IMG" "$rt_offset" "\x00\x00\x00\x00\x00\x02\x2a\x00" 202$QEMU_IO -c "write 0 64k" "$TEST_IMG" | _filter_qemu_io 203 204echo 205echo "=== Testing non-fatal corruption on freeing ===" 206echo 207_make_test_img 64M 208$QEMU_IO -c "write 0 64k" "$TEST_IMG" | _filter_qemu_io 209poke_file "$TEST_IMG" "$l2_offset" "\x80\x00\x00\x00\x00\x05\x2a\x00" 210$QEMU_IO -c "discard 0 64k" "$TEST_IMG" | _filter_qemu_io 211 212echo 213echo "=== Testing read-only corruption report ===" 214echo 215_make_test_img 64M 216$QEMU_IO -c "write 0 64k" "$TEST_IMG" | _filter_qemu_io 217poke_file "$TEST_IMG" "$l2_offset" "\x80\x00\x00\x00\x00\x05\x2a\x00" 218# Should only emit a single error message 219$QEMU_IO -c "$OPEN_RO" -c "read 0 64k" -c "read 0 64k" | _filter_qemu_io 220 221echo 222echo "=== Testing non-fatal and then fatal corruption report ===" 223echo 224_make_test_img 64M 225$QEMU_IO -c "write 0 128k" "$TEST_IMG" | _filter_qemu_io 226poke_file "$TEST_IMG" "$l2_offset" "\x80\x00\x00\x00\x00\x05\x2a\x00" 227poke_file "$TEST_IMG" "$(($l2_offset+8))" "\x80\x00\x00\x00\x00\x06\x2a\x00" 228# Should emit two error messages 229$QEMU_IO -c "discard 0 64k" -c "read 64k 64k" "$TEST_IMG" | _filter_qemu_io 230 231# success, all done 232echo "*** done" 233rm -f $seq.full 234status=0 235