1/* 2 * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24/* 25 * @test 26 * @bug 4893489 27 * @summary Subject.doAs not thread-safe against changes to principals 28 */ 29 30import java.security.Principal; 31import java.security.PrivilegedAction; 32import java.util.Collections; 33import java.util.Set; 34import javax.security.auth.Subject; 35import javax.security.auth.x500.X500Principal; 36 37public class Synch { 38 static volatile boolean finished = false; 39 public static void main(String[] args) { 40 Subject subject = new Subject(); 41 final Set principals = subject.getPrincipals(); 42 principals.add(new X500Principal("CN=Alice")); 43 new Thread() { 44 public void run() { 45 Principal last = new X500Principal("CN=Bob"); 46 for (int i = 0; !finished; i++) { 47 Principal next = new X500Principal("CN=Bob" + i); 48 principals.add(next); 49 principals.remove(last); 50 last = next; 51 } 52 } 53 }.start(); 54 for (int i = 0; i < 1000; i++) { 55 Subject.doAs( 56 subject, 57 new PrivilegedAction() { 58 public Object run() { 59 return Subject.doAs( 60 new Subject(true, 61 Collections.singleton( 62 new X500Principal("CN=Claire")), 63 Collections.EMPTY_SET, 64 Collections.EMPTY_SET), 65 new PrivilegedAction() { 66 public Object run() { 67 return null; 68 } 69 }); 70 } 71 }); 72 } 73 finished = true; 74 } 75} 76