#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2017 Fujitsu.  All Rights Reserved.
#
# FS QA Test ext4/025
#
# Regression test for commit:
# 3a4b77c ("ext4: validate s_first_meta_bg at mount time").
#
. ./common/preamble
_begin_fstest auto quick fuzzers dangerous

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

# real QA test starts here
_supported_fs ext4
_require_scratch_nocheck
_require_command "$DEBUGFS_PROG" debugfs
_require_scratch_ext4_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"
_try_scratch_mount >> $seqres.full 2>&1 || echo "Fail to mount ext4 fs expectedly"

# success, all done
status=0
exit