[xfstests v4 5/8] overlay: filter out xattr starts with "trusted.overlay."

Xiong Zhou
2017-02-23T09:43:30Z

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.

CC: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Xiong Zhou <xzhou@redhat.com>
---
tests/overlay/026 | 110 ++++++++++++++++++++++++++++++++++++++++++++++++++
tests/overlay/026.out | 6 +++
tests/overlay/group | 1 +
3 files changed, 117 insertions(+)
create mode 100755 tests/overlay/026
create mode 100644 tests/overlay/026.out

diff --git a/tests/overlay/026 b/tests/overlay/026
new file mode 100755
index 0000000..55adbad
--- /dev/null
+++ b/tests/overlay/026
@@ -0,0 +1,110 @@
+#! /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
diff --git a/tests/overlay/026.out b/tests/overlay/026.out
new file mode 100644
index 0000000..c4572d6
--- /dev/null
+++ b/tests/overlay/026.out
@@ -0,0 +1,6 @@
+QA output created by 026
+# file: SCRATCH_MNT/testf0
+trusted.overlayfsrz="n"
+
+setfattr: SCRATCH_MNT/testf1: Operation not supported
+SCRATCH_MNT/testf1: trusted.overlay.fsz: Operation not supported
diff --git a/tests/overlay/group b/tests/overlay/group
index 82fe69e..92afa8d 100644
--- a/tests/overlay/group
+++ b/tests/overlay/group
@@ -28,3 +28,4 @@
023 auto quick attr
024 auto quick
025 auto quick attr
+026 auto attr quick
--
1.8.3.1