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 generic
  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
  51 IMGOPTS="compat=1.1"
  52
  53 echo
  54 echo "=== Testing L2 reference into L1 ==="
  55 echo
  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)
  61 poke_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
  82 echo
  83 echo "=== Testing cluster data reference into refcount block ==="
  84 echo
  85 _make_test_img 64M
  86 # Allocate L2 table
  87 truncate -s "$(($l2_offset+65536))" "$TEST_IMG"
  88 poke_file "$TEST_IMG" "$l1_offset" "\x80\x00\x00\x00\x00\x04\x00\x00"
  89 # Mark cluster as used
  90 poke_file "$TEST_IMG" "$(($rb_offset+8))" "\x00\x01"
  91 # Redirect new data cluster onto refcount block
  92 poke_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
 109 echo "*** done"
 110 rm -f $seq.full
 111 status=0