tests/qemu-iotests/060

   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
  22 owner=mreitz@redhat.com
  23
  24 seq="$(basename $0)"
  25 echo "QA output created by $seq"
  26
  27 here="$PWD"
  28 tmp=/tmp/$$
  29 status=1        # failure is the default!
  30
  31 _cleanup()
  32 {
  33         _cleanup_test_img
  34 }
  35 trap "_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
  46 rt_offset=65536  # 0x10000 (XXX: just an assumption)
  47 rb_offset=131072 # 0x20000 (XXX: just an assumption)
  48 l1_offset=196608 # 0x30000 (XXX: just an assumption)
  49 l2_offset=262144 # 0x40000 (XXX: just an assumption)
  50 l2_offset_after_snapshot=524288 # 0x80000 (XXX: just an assumption)
  51
  52 IMGOPTS="compat=1.1"
  53
  54 OPEN_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
  57 OPEN_RO="open -r $TEST_IMG"
  58
  59 echo
  60 echo "=== Testing L2 reference into L1 ==="
  61 echo
  62 _make_test_img 64M
  63 # Link first L1 entry (first L2 table) onto itself
  64 # (Note the MSb in the L1 entry is set, ensuring the refcount is one - else any
  65 # later write will result in a COW operation, effectively ruining this attempt
  66 # on image corruption)
  67 poke_file "$TEST_IMG" "$l1_offset" "\x80\x00\x00\x00\x00\x03\x00\x00"
  68 _check_test_img
  69
  70 # The corrupt bit should not be set anyway
  71 ./qcow2.py "$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 ./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
  78
  79 # Try to open the image R/W (which should fail)
  80 $QEMU_IO -c "$OPEN_RW" -c "read 0 512" 2>&1 | _filter_qemu_io \
  81                                             | _filter_testdir \
  82                                             | _filter_imgfmt
  83
  84 # Try to open it RO (which should succeed)
  85 $QEMU_IO -c "$OPEN_RO" -c "read 0 512" | _filter_qemu_io
  86
  87 # We could now try to fix the image, but this would probably fail (how should an
  88 # L2 table linked onto the L1 table be fixed?)
  89
  90 echo
  91 echo "=== Testing cluster data reference into refcount block ==="
  92 echo
  93 _make_test_img 64M
  94 # Allocate L2 table
  95 truncate -s "$(($l2_offset+65536))" "$TEST_IMG"
  96 poke_file "$TEST_IMG" "$l1_offset" "\x80\x00\x00\x00\x00\x04\x00\x00"
  97 # Mark cluster as used
  98 poke_file "$TEST_IMG" "$(($rb_offset+8))" "\x00\x01"
  99 # Redirect new data cluster onto refcount block
 100 poke_file "$TEST_IMG" "$l2_offset" "\x80\x00\x00\x00\x00\x02\x00\x00"
 101 _check_test_img
 102 ./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
 103 $QEMU_IO -c "$OPEN_RW" -c "write -P 0x2a 0 512" | _filter_qemu_io
 104 ./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
 105
 106 # Try to fix it
 107 _check_test_img -r all
 108
 109 # The corrupt bit should be cleared
 110 ./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
 111
 112 # Look if it's really really fixed
 113 $QEMU_IO -c "$OPEN_RW" -c "write -P 0x2a 0 512" | _filter_qemu_io
 114 ./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
 115
 116 echo
 117 echo "=== Testing cluster data reference into inactive L2 table ==="
 118 echo
 119 _make_test_img 64M
 120 $QEMU_IO -c "$OPEN_RW" -c "write -P 1 0 512" | _filter_qemu_io
 121 $QEMU_IMG snapshot -c foo "$TEST_IMG"
 122 $QEMU_IO -c "$OPEN_RW" -c "write -P 2 0 512" | _filter_qemu_io
 123 # The inactive L2 table remains at its old offset
 124 poke_file "$TEST_IMG" "$l2_offset_after_snapshot" \
 125                       "\x80\x00\x00\x00\x00\x04\x00\x00"
 126 _check_test_img
 127 ./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
 128 $QEMU_IO -c "$OPEN_RW" -c "write -P 3 0 512" | _filter_qemu_io
 129 ./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
 130 _check_test_img -r all
 131 ./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
 132 $QEMU_IO -c "$OPEN_RW" -c "write -P 4 0 512" | _filter_qemu_io
 133 ./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
 134
 135 # Check data
 136 $QEMU_IO -c "$OPEN_RO" -c "read -P 4 0 512" | _filter_qemu_io
 137 $QEMU_IMG snapshot -a foo "$TEST_IMG"
 138 _check_test_img
 139 $QEMU_IO -c "$OPEN_RO" -c "read -P 1 0 512" | _filter_qemu_io
 140
 141 # success, all done
 142 echo "*** done"
 143 rm -f $seq.full
 144 status=0