tests/overlay/026

#! /bin/bash
# FS QA Test 026
#
# Overlayfs should only filter out xattr starting with
# "trusted.overlay.", not "trusted.overlay".
#
# Setting xattrs like "trusted.overlay.xxx" is not allowed.
# Setting xattrs like "trusted.overlayxxx" is allowed.
#
# v4.8-rc1 introduced a regression that we can't set xattrs
# like "trusted.overlayxxx".  Kernel commit below fixed it
# in v4.8:
#   fe2b75952347 ovl: Fix OVL_XATTR_PREFIX
#
# This case tests both get/set of these 2 kinds of xattrs.
#
# Pattern "trusted.overlay.xxx" should fail, however the
# errno returned by set/get varies among kernel versions.
# Pattern "trusted.overlayxxx" shold always work.
#
# This reproducer was originally written by
#     Miklos Szeredi <mszeredi@redhat.com>
#
#-----------------------------------------------------------------------
# Copyright (c) 2017 Red Hat Inc.  All Rights Reserved.
#
# 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"

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

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

# get standard environment, filters and checks
. ./common/rc
. ./common/attr
. ./common/filter

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

# real QA test starts here

# Modify as appropriate.
_supported_fs overlay
_supported_os Linux
_require_scratch
_require_attrs

# Remove all files from previous tests
_scratch_mkfs

# Mounting overlay
_scratch_mount
touch $SCRATCH_MNT/testf0
touch $SCRATCH_MNT/testf1

# {s,g}etfattr of "trusted.overlayxxx" should work.
#            v4.3/6/7    v4.8-rc1   v4.8  v4.10
# setfattr    ok         not perm    ok    ok
# getfattr    ok         no attr     ok    ok
#
$SETFATTR_PROG -n "trusted.overlayfsrz" -v "n" \
  $SCRATCH_MNT/testf0 2>&1 | _filter_scratch

$GETFATTR_PROG --absolute-names -n "trusted.overlayfsrz" \
  $SCRATCH_MNT/testf0 2>&1 | _filter_scratch

# {s,g}etfattr of "trusted.overlay.xxx" should fail.
# The errno returned varies among kernel versions,
#            v4.3/7   v4.8-rc1    v4.8       v4.10
# setfattr  not perm  not perm   not perm   not supp
# getfattr  no attr   no attr    not perm   not supp
#
# Consider "Operation not {supported,permitted}" pass.
#
$SETFATTR_PROG -n "trusted.overlay.fsz" -v "n" \
  $SCRATCH_MNT/testf1 2>&1 | _filter_scratch | \
  sed -e 's/permitted/supported/g'

$GETFATTR_PROG --absolute-names -n "trusted.overlay.fsz" \
  $SCRATCH_MNT/testf1 2>&1 | _filter_scratch | \
  sed -e 's/permitted/supported/g'

# success, all done
status=0
exit