[PATCH v2] generic: new test to verify selinux label of whiteout inode

[Zorro Lang <zlang@kernel.org>]

A but on XFS cause renameat2() with flags=RENAME_WHITEOUT doesn't
apply an selinux label. That's quite different with other fs (e.g.
ext4, tmpfs).

Signed-off-by: Zorro Lang <zlang@kernel.org>
---

Thanks the review points from Amir, this v2 did below changes:
1) Add "whiteout" group
2) Add commit ID from xfs-linux xfs-5.20-merge-2 (will change if need)
3) Rebase to latest fstests for-next branch

Thanks,
Zorro

 tests/generic/693     | 64 +++++++++++++++++++++++++++++++++++++++++++
 tests/generic/693.out |  2 ++
 2 files changed, 66 insertions(+)
 create mode 100755 tests/generic/693
 create mode 100644 tests/generic/693.out

diff --git a/tests/generic/693 b/tests/generic/693
new file mode 100755
index 00000000..adf191c4
--- /dev/null
+++ b/tests/generic/693
@@ -0,0 +1,64 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2022 Red Hat, Copyright.  All Rights Reserved.
+#
+# FS QA Test No. 693
+#
+# Verify selinux label can be kept after RENAME_WHITEOUT. This is
+# a regression test for:
+#   70b589a37e1a ("xfs: add selinux labels to whiteout inodes")
+#
+. ./common/preamble
+_begin_fstest auto quick rename attr whiteout
+
+# Import common functions.
+. ./common/attr
+. ./common/renameat2
+
+# real QA test starts here
+_supported_fs generic
+_require_scratch
+_require_attrs
+_require_renameat2 whiteout
+
+_fixed_by_kernel_commit 70b589a37e1a \
+	xfs: add selinux labels to whiteout inodes
+
+get_selinux_label()
+{
+	local label
+
+	label=`_getfattr --absolute-names -n security.selinux $@ | sed -n 's/security.selinux=\"\(.*\)\"/\1/p'`
+	if [ ${PIPESTATUS[0]} -ne 0 -o -z "$label" ];then
+		_fail "Fail to get selinux label: $label"
+	fi
+	echo $label
+}
+
+_scratch_mkfs >> $seqres.full 2>&1
+# SELINUX_MOUNT_OPTIONS will be set in common/config if selinux is enabled
+if [ -z "$SELINUX_MOUNT_OPTIONS" ]; then
+	_notrun "Require selinux to be enabled"
+fi
+# This test need to verify selinux labels in objects, so unset this selinux
+# mount option
+export SELINUX_MOUNT_OPTIONS=""
+_scratch_mount
+
+touch $SCRATCH_MNT/f1
+echo "Before RENAME_WHITEOUT" >> $seqres.full
+ls -lZ $SCRATCH_MNT >> $seqres.full 2>&1
+# Expect f1 and f2 have same label after RENAME_WHITEOUT
+$here/src/renameat2 -w $SCRATCH_MNT/f1 $SCRATCH_MNT/f2
+echo "After RENAME_WHITEOUT" >> $seqres.full
+ls -lZ $SCRATCH_MNT >> $seqres.full 2>&1
+label1=`get_selinux_label $SCRATCH_MNT/f1`
+label2=`get_selinux_label $SCRATCH_MNT/f2`
+if [ "$label1" != "$label2" ];then
+	echo "$label1 != $label2"
+fi
+
+echo "Silence is golden"
+# success, all done
+status=0
+exit
diff --git a/tests/generic/693.out b/tests/generic/693.out
new file mode 100644
index 00000000..01884ea5
--- /dev/null
+++ b/tests/generic/693.out
@@ -0,0 +1,2 @@
+QA output created by 693
+Silence is golden
-- 
2.31.1