Linux: Initialize zp in zfs_setattr_dir

The value of zp is used without having been initialized under some
conditions.  Initialize the pointer to NULL.

Add a regression test case using chown in acl/posix.  However, this is
not enough because the setup sets xattr=sa, which means zfs_setattr_dir
will not be called.  Create a second group of acl tests in acl/posix-sa
duplicating the acl/posix tests with symlinks, and remove xattr=sa from
the original acl/posix tests.  This provides more coverage for the
default xattr=on code.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ryan Moeller <ryan@iXsystems.com>
Closes #10043
Closes #11025

configure.ac

@@ -237,6 +237,7 @@ AC_CONFIG_FILES([
 	tests/zfs-tests/tests/functional/Makefile
 	tests/zfs-tests/tests/functional/acl/Makefile
 	tests/zfs-tests/tests/functional/acl/posix/Makefile
+	tests/zfs-tests/tests/functional/acl/posix-sa/Makefile
 	tests/zfs-tests/tests/functional/alloc_class/Makefile
 	tests/zfs-tests/tests/functional/arc/Makefile
 	tests/zfs-tests/tests/functional/atime/Makefile

man/man8/zfsprops.8

@@ -1794,7 +1794,7 @@ on platforms which do not support the
 feature.
 .Pp
 The use of system attribute based xattrs is strongly encouraged for users of
-SELinux or POSIX ACLs. Both of these features heavily rely of extended
+SELinux or POSIX ACLs. Both of these features heavily rely on extended
 attributes and benefit significantly from the reduced access time.
 .Pp
 The values

module/os/linux/zfs/zfs_vnops.c

@@ -2543,7 +2543,7 @@ zfs_setattr_dir(znode_t *dzp)
 	zap_cursor_t	zc;
 	zap_attribute_t	zap;
 	zfs_dirlock_t	*dl;
-	znode_t		*zp;
+	znode_t		*zp = NULL;
 	dmu_tx_t	*tx = NULL;
 	uint64_t	uid, gid;
 	sa_bulk_attr_t	bulk[4];

tests/runfiles/linux.run

@@ -23,9 +23,13 @@ outputdir = /var/tmp/test_results
 tags = ['functional']
 
 [tests/functional/acl/posix:Linux]
-tests = ['posix_001_pos', 'posix_002_pos', 'posix_003_pos']
+tests = ['posix_001_pos', 'posix_002_pos', 'posix_003_pos', 'posix_004_pos']
 tags = ['functional', 'acl', 'posix']
 
+[tests/functional/acl/posix-sa:Linux]
+tests = ['posix_001_pos', 'posix_002_pos', 'posix_003_pos', 'posix_004_pos']
+tags = ['functional', 'acl', 'posix-sa']
+
 [tests/functional/atime:Linux]
 tests = ['atime_003_pos', 'root_relatime_on']
 tags = ['functional', 'atime']

tests/zfs-tests/tests/functional/acl/Makefile.am

@@ -3,4 +3,4 @@ dist_pkgdata_DATA = \
 	acl.cfg \
 	acl_common.kshlib
 
-SUBDIRS = posix
+SUBDIRS = posix posix-sa

tests/zfs-tests/tests/functional/acl/posix-sa/Makefile.am

@@ -0,0 +1,8 @@
+pkgdatadir = $(datadir)/@PACKAGE@/zfs-tests/tests/functional/acl/posix-sa
+dist_pkgdata_SCRIPTS = \
+	cleanup.ksh \
+	setup.ksh \
+	posix_001_pos.ksh \
+	posix_002_pos.ksh \
+	posix_003_pos.ksh \
+	posix_004_pos.ksh

tests/zfs-tests/tests/functional/acl/posix-sa/cleanup.ksh

@@ -0,0 +1,33 @@
+#!/bin/ksh -p
+#
+# CDDL HEADER START
+#
+# The contents of this file are subject to the terms of the
+# Common Development and Distribution License (the "License").
+# You may not use this file except in compliance with the License.
+#
+# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+# or http://www.opensolaris.org/os/licensing.
+# See the License for the specific language governing permissions
+# and limitations under the License.
+#
+# When distributing Covered Code, include this CDDL HEADER in each
+# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+# If applicable, add the following below this CDDL HEADER, with the
+# fields enclosed by brackets "[]" replaced with your own identifying
+# information: Portions Copyright [yyyy] [name of copyright owner]
+#
+# CDDL HEADER END
+#
+
+#
+# Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+# Use is subject to license terms.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/acl/acl_common.kshlib
+
+cleanup_user_group
+
+default_cleanup

tests/zfs-tests/tests/functional/acl/posix-sa/posix_001_pos.ksh

@@ -0,0 +1 @@
+../posix/posix_001_pos.ksh

tests/zfs-tests/tests/functional/acl/posix-sa/posix_002_pos.ksh

@@ -0,0 +1 @@
+../posix/posix_002_pos.ksh

tests/zfs-tests/tests/functional/acl/posix-sa/posix_003_pos.ksh

@@ -0,0 +1 @@
+../posix/posix_003_pos.ksh

tests/zfs-tests/tests/functional/acl/posix-sa/posix_004_pos.ksh

@@ -0,0 +1 @@
+../posix/posix_004_pos.ksh

tests/zfs-tests/tests/functional/acl/posix-sa/setup.ksh

@@ -0,0 +1,52 @@
+#!/bin/ksh -p
+#
+# CDDL HEADER START
+#
+# The contents of this file are subject to the terms of the
+# Common Development and Distribution License (the "License").
+# You may not use this file except in compliance with the License.
+#
+# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+# or http://www.opensolaris.org/os/licensing.
+# See the License for the specific language governing permissions
+# and limitations under the License.
+#
+# When distributing Covered Code, include this CDDL HEADER in each
+# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+# If applicable, add the following below this CDDL HEADER, with the
+# fields enclosed by brackets "[]" replaced with your own identifying
+# information: Portions Copyright [yyyy] [name of copyright owner]
+#
+# CDDL HEADER END
+#
+
+#
+# Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+# Use is subject to license terms.
+#
+
+#
+# Copyright (c) 2016 by Delphix. All rights reserved.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/acl/acl_common.kshlib
+
+log_must getfacl --version
+log_must setfacl --version
+
+cleanup_user_group
+
+# Create staff group and add user to it
+log_must add_group $ZFS_ACL_STAFF_GROUP
+log_must add_user $ZFS_ACL_STAFF_GROUP $ZFS_ACL_STAFF1
+
+DISK=${DISKS%% *}
+default_setup_noexit $DISK
+log_must chmod 777 $TESTDIR
+
+# Use POSIX ACLs on filesystem
+log_must zfs set acltype=posix $TESTPOOL/$TESTFS
+log_must zfs set xattr=sa $TESTPOOL/$TESTFS
+
+log_pass

tests/zfs-tests/tests/functional/acl/posix/Makefile.am

@@ -4,4 +4,5 @@ dist_pkgdata_SCRIPTS = \
 	setup.ksh \
 	posix_001_pos.ksh \
 	posix_002_pos.ksh \
-	posix_003_pos.ksh
+	posix_003_pos.ksh \
+	posix_004_pos.ksh

tests/zfs-tests/tests/functional/acl/posix/posix_004_pos.ksh

@@ -0,0 +1,49 @@
+#!/bin/ksh -p
+#
+# CDDL HEADER START
+#
+# The contents of this file are subject to the terms of the
+# Common Development and Distribution License (the "License").
+# You may not use this file except in compliance with the License.
+#
+# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+# or http://www.opensolaris.org/os/licensing.
+# See the License for the specific language governing permissions
+# and limitations under the License.
+#
+# When distributing Covered Code, include this CDDL HEADER in each
+# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+# If applicable, add the following below this CDDL HEADER, with the
+# fields enclosed by brackets "[]" replaced with your own identifying
+# information: Portions Copyright [yyyy] [name of copyright owner]
+#
+# CDDL HEADER END
+#
+
+#
+# Portions Copyright 2020 iXsystems, Inc.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/acl/acl_common.kshlib
+
+#
+# DESCRIPTION:
+#	Verify chown works with POSIX ACLs.
+#	Regression test for https://github.com/openzfs/zfs/issues/10043
+#
+# STRATEGY:
+#	1. Prepare an appropriate ACL on the test directory
+#	2. Change the owner of the directory
+#
+
+verify_runnable "both"
+log_assert "Verify chown works with POSIX ACLs"
+
+log_must setfacl -d -m u:$ZFS_ACL_STAFF1:rwx $TESTDIR
+log_must setfacl -b $TESTDIR
+
+log_must chown $ZFS_ACL_STAFF1 $TESTDIR
+log_must chown 0 $TESTDIR
+
+log_pass "chown works with POSIX ACLs"

tests/zfs-tests/tests/functional/acl/posix/setup.ksh

@@ -47,6 +47,5 @@ log_must chmod 777 $TESTDIR
 
 # Use POSIX ACLs on filesystem
 log_must zfs set acltype=posix $TESTPOOL/$TESTFS
-log_must zfs set xattr=sa $TESTPOOL/$TESTFS
 
 log_pass