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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2017 Red Hat Inc. All Rights Reserved.
#
# FS QA Test 022
#
# Regression test for kernel commit:
# 76bc8e2 ovl: disallow overlayfs as upperdir
#
# This reproducer was originally written by
# Miklos Szeredi <mszeredi@redhat.com>
#
. ./common/preamble
_begin_fstest auto quick mount nested
# Override the default cleanup function.
_cleanup()
{
cd /
$UMOUNT_PROG $tmp/mnt > /dev/null 2>&1
rm -rf $tmp
rm -f $tmp.*
}
# Import common functions.
. ./common/filter
# real QA test starts here
# Modify as appropriate.
_supported_fs overlay
_fixed_by_kernel_commit 76bc8e2843b6 "ovl: disallow overlayfs as upperdir"
_require_scratch
# Remove all files from previous tests
_scratch_mkfs
upperdir=$OVL_BASE_SCRATCH_MNT/$OVL_UPPER
mkdir -p $upperdir/upper
mkdir -p $upperdir/work
# mount overlay with dirs in upper
_scratch_mount
mkdir -p $tmp/{lower,mnt}
# mount overlay using upper from another overlay upper
# should fail
_overlay_mount_dirs $tmp/lower $SCRATCH_MNT/upper \
$SCRATCH_MNT/work overlay $tmp/mnt > /dev/null 2>&1
if [ $? -ne 0 ] ; then
echo "Silence is golden"
else
echo "Test Fail"
echo "Overlay upperdir can't be another overlay upperdir"
fi
# success, all done
status=0
exit
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