tests/ts/mount/rlimit

   1 #!/bin/bash
   2
   3 #
   4 # Copyright (C) 2007 Karel Zak <kzak@redhat.com>
   5 #
   6 # This file is part of util-linux.
   7 #
   8 # This file is free software; you can redistribute it and/or modify
   9 # it under the terms of the GNU General Public License as published by
  10 # the Free Software Foundation; either version 2 of the License, or
  11 # (at your option) any later version.
  12 #
  13 # This file is distributed in the hope that it will be useful,
  14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 # GNU General Public License for more details.
  17 #
  18
  19 #
  20 # The /etc/mtab file should not be modified if RLIMIT_FSIZE (ulimit -f)
  21 # is too low, otherwise the file could be corrupted (incomplete write).
  22 # The [u]mount(8) has to block SIGXFSZ and check if all writes and fflush
  23 # calls are successful.
  24 #
  25
  26 TS_TOPDIR="${0%/*}/../.."
  27 TS_DESC="rlimit-fsize"
  28
  29 . $TS_TOPDIR/functions.sh
  30 ts_init "$*"
  31
  32 ts_check_test_command "$TS_CMD_MOUNT"
  33 ts_check_test_command "$TS_CMD_UMOUNT"
  34 ts_check_prog "mkfs.ext3"
  35
  36 ts_skip_nonroot
  37 ts_check_losetup
  38
  39 [ -L /etc/mtab ] && ts_skip "mtab is symlink"
  40 [ "$(stat --format '%s' /etc/mtab)" -gt "1024" ] || ts_skip "mtab is too small"
  41
  42 set -o pipefail
  43
  44 function mtab_checksum()
  45 {
  46         md5sum /etc/mtab | awk '{printf $1}'
  47 }
  48
  49 DEVICE=$(ts_device_init)
  50 [ "$?" == 0 ] || ts_die "Cannot init device"
  51
  52 mkfs.ext3 $DEVICE &> /dev/null || ts_die "Cannot make ext3 on $DEVICE" $DEVICE
  53
  54
  55 ts_init_subtest "mount"
  56 OLD_SUM=$(mtab_checksum)
  57 [ -d "$TS_MOUNTPOINT" ] || mkdir -p $TS_MOUNTPOINT
  58 (
  59         ulimit -f 1
  60         $TS_CMD_MOUNT $DEVICE $TS_MOUNTPOINT
  61 ) &> /dev/null
  62 NEW_SUM=$(mtab_checksum)
  63 [ $NEW_SUM = $OLD_SUM ] && echo "OK: mtab unmodified by mount" >> $TS_OUTPUT
  64 ts_is_mounted $DEVICE || ts_die "Cannot find $DEVICE in /proc/mounts"
  65 $TS_CMD_UMOUNT $TS_MOUNTPOINT &> /dev/null
  66 ts_is_mounted $DEVICE && ts_die "$DEVICE is still mounted"
  67 ts_finalize_subtest
  68
  69
  70 ts_init_subtest "umount"
  71 [ -d "$TS_MOUNTPOINT" ] || mkdir -p $TS_MOUNTPOINT
  72 $TS_CMD_MOUNT $DEVICE $TS_MOUNTPOINT &> /dev/null
  73 ts_is_mounted $DEVICE || ts_die "Cannot find $DEVICE in /proc/mounts"
  74 OLD_SUM=$(mtab_checksum)
  75 (
  76         ulimit -f 1
  77         $TS_CMD_UMOUNT $TS_MOUNTPOINT &> /dev/null
  78 ) &> /dev/null
  79 NEW_SUM=$(mtab_checksum)
  80 [ $NEW_SUM = $OLD_SUM ] && echo "OK: mtab unmodified by umount" >> $TS_OUTPUT
  81 if ts_is_mounted $DEVICE; then
  82         echo "FAIL: $DEVICE is still mounted" >> $TS_OUTPUT
  83         $TS_CMD_UMOUNT $TS_MOUNTPOINT &> /dev/null
  84 else
  85         # repair /etc/mtab
  86         $TS_CMD_UMOUNT --fake $TS_MOUNTPOINT &> /dev/null
  87 fi
  88 ts_finalize_subtest
  89
  90
  91 ts_device_deinit $DEVICE
  92 ts_log "Success"
  93 ts_finalize