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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2017 Red Hat Inc. All Rights Reserved.
#
# FS QA Test 027
#
# If underlying upper file is immutable, it should stays
# untouchable in the overlayfs mount.
#
# Kernel commit below fixed it.
# f2b20f6ee842 vfs: move permission checking into ...
#
# This reproducer was originally written by
# Miklos Szeredi <mszeredi@redhat.com>
#
. ./common/preamble
_begin_fstest auto quick perms
# Override the default cleanup function.
_cleanup()
{
cd /
$CHATTR_PROG -i $upperdir/foo
rm -f $tmp.*
}
# Import common functions.
. ./common/filter
# real QA test starts here
# Modify as appropriate.
_supported_fs overlay
_require_scratch
_require_chattr i
# Remove all files from previous tests
_scratch_mkfs
# Preparing immutable file
upperdir=$OVL_BASE_SCRATCH_MNT/$OVL_UPPER
mkdir -p $upperdir
touch $upperdir/foo
$CHATTR_PROG +i $upperdir/foo
# Mounting overlay
_scratch_mount
# Touching immutable file in overlay, should fail.
# Not filtering output here because of errno returned
# varies among kernel versions:
# touch: setting times of 'foo': Operation not permitted
# touch: cannot touch 'foo': Permission denied
if touch $SCRATCH_MNT/foo > /dev/null 2>&1 ; then
echo "Test Fail, you can't change an immutable file"
else
echo "Silence is golden"
fi
# success, all done
status=0
exit
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