tests/qemu-iotests/138

   1 #!/usr/bin/env bash
   2 #
   3 # General test case for qcow2's image check
   4 #
   5 # Copyright (C) 2015 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 $seq"
  26
  27 status=1        # failure is the default!
  28
  29 _cleanup()
  30 {
  31         _cleanup_test_img
  32 }
  33 trap "_cleanup; exit \$status" 0 1 2 3 15
  34
  35 # get standard environment, filters and checks
  36 . ./common.rc
  37 . ./common.filter
  38
  39 # This tests qocw2-specific low-level functionality
  40 _supported_fmt qcow2
  41 _supported_proto file
  42 _supported_os Linux
  43
  44 echo
  45 echo '=== Check on an image with a multiple of 2^32 clusters ==='
  46 echo
  47
  48 IMGOPTS=$(_optstr_add "$IMGOPTS" "cluster_size=512") \
  49     _make_test_img 512
  50
  51 # Allocate L2 table
  52 $QEMU_IO -c 'write 0 512' "$TEST_IMG" | _filter_qemu_io
  53
  54 # Put the data cluster at a multiple of 2 TB, resulting in the image apparently
  55 # having a multiple of 2^32 clusters
  56 # (To be more specific: It is at 32 PB)
  57 poke_file "$TEST_IMG" 2048 "\x80\x80\x00\x00\x00\x00\x00\x00"
  58
  59 # An offset of 32 PB results in qemu-img check having to allocate an in-memory
  60 # refcount table of 128 TB (16 bit refcounts, 512 byte clusters).
  61 # This should be generally too much for any system and thus fail.
  62 # What this test is checking is that the qcow2 driver actually tries to allocate
  63 # such a large amount of memory (and is consequently aborting) instead of having
  64 # truncated the cluster count somewhere (which would result in much less memory
  65 # being allocated and then a segfault occurring).
  66 _check_test_img
  67
  68 # success, all done
  69 echo "*** done"
  70 rm -f $seq.full
  71 status=0