#! /bin/bash
# FS QA Test ext4/025
#
# Regression test for commit:
# 3a4b77c ("ext4: validate s_first_meta_bg at mount time").
#
#-----------------------------------------------------------------------
# Copyright (c) 2017 Fujitsu.  All Rights Reserved.
# Author: Xiao Yang <yangx.jy@cn.fujitsu.com>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it would be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write the Free Software Foundation,
# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#-----------------------------------------------------------------------


seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"

tmp=/tmp/$$
status=1	# failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15

_cleanup()
{
	rm -f $tmp.*
}

# get standard environment and checks
. ./common/rc
. ./common/filter

# remove previous $seqres.full before test
rm -f $seqres.full

# real QA test starts here
_supported_fs ext4
_supported_os Linux
_require_scratch_nocheck
_require_command "$DEBUGFS_PROG" debugfs
_require_ext4_mkfs_feature "bigalloc,meta_bg,^resize_inode"

echo "Create ext4 fs and modify first_meta_bg's value"
_scratch_mkfs "-O bigalloc,meta_bg,^resize_inode" >> $seqres.full 2>&1

# set a big enough first_meta_bg to trigger buffer overrun
# 842150400 is from original fuzzed ext4 image in bug report
$DEBUGFS_PROG -w -R "ssv first_meta_bg 842150400" $SCRATCH_DEV >> $seqres.full 2>&1

echo "Try to mount a modified ext4 fs"
_scratch_mount >> $seqres.full 2>&1 || echo "Fail to mount ext4 fs expectedly"

# success, all done
status=0
exit