1 /* 2 * Copyright (c) 2001, 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 /* @test 25 * @bug 4450867 26 * @summary Although technically the behavior of ObjectInputStream following a 27 * UTFDataFormatException is unspecified, verify that 28 * ObjectInputStream consumes at most the expected number of utf 29 * bytes, even if the last byte(s) of the utf string indicate that the 30 * string overflows its expected length. 31 */ 32 33 import java.io.*; 34 import java.util.Random; 35 36 public class CorruptedUTFConsumption { 37 38 static Random rand = new Random(System.currentTimeMillis()); 39 40 public static void main(String[] args) throws Exception { 41 StringBuffer sbuf = new StringBuffer(); 42 ByteArrayOutputStream bout = new ByteArrayOutputStream(); 43 DataOutputStream dout = new DataOutputStream(bout); 44 45 for (int i = 0; i < 1200; i++) { 46 sbuf.append(i % 10); 47 bout.reset(); 48 dout.writeUTF(sbuf.toString()); 49 byte[] utf = bout.toByteArray(); 50 51 // set last byte to first byte of 2-char sequence 52 utf[utf.length - 1] = (byte) (0xC0 | rand.nextInt() & 0x1F); 53 checkConsume(utf); 54 55 // set last byte to first byte of 3-char sequence 56 utf[utf.length - 1] = (byte) (0xE0 | rand.nextInt() & 0x0F); 57 checkConsume(utf); 58 59 if (utf.length >= 4) { // don't touch utf length bytes 60 // set last 2 bytes to first, second byte of 3-char sequence 61 utf[utf.length - 2] = (byte) (0xE0 | rand.nextInt() & 0x0F); 62 utf[utf.length - 1] = (byte) (0x80 | rand.nextInt() & 0x3F); 63 checkConsume(utf); 64 } 65 } 66 } 67 68 static void checkConsume(byte[] utf) throws Exception { 69 ByteArrayOutputStream bout = new ByteArrayOutputStream(); 70 ObjectOutputStream oout = new ObjectOutputStream(bout); 71 oout.write(utf); 72 oout.writeByte(0); // leave one byte of padding 73 oout.close(); 74 ObjectInputStream oin = new ObjectInputStream( 75 new ByteArrayInputStream(bout.toByteArray())); 76 try { 77 oin.readUTF(); 78 throw new Error(); 79 } catch (UTFDataFormatException ex) { 80 } 81 // if readUTF consumed padding byte, readByte will throw EOFException 82 oin.readByte(); 83 } 84 }