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1 /* |
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2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 |
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24 /* |
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25 * @test |
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26 * @bug 8027445 |
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27 * @summary String.equals() may be called with a length whose upper bits are not cleared |
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28 * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation TestStringEqualsBadLength |
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29 * |
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30 */ |
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31 |
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32 import java.util.Arrays; |
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33 |
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34 public class TestStringEqualsBadLength { |
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35 |
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36 int v1; |
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37 int v2; |
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38 |
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39 boolean m(String s1) { |
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40 int l = v2 - v1; // 0 - (-1) = 1. On 64 bit: 0xffffffff00000001 |
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41 char[] arr = new char[l]; |
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42 arr[0] = 'a'; |
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43 String s2 = new String(arr); |
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44 // The string length is not reloaded but the value computed is |
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45 // reused so pointer computation must not use |
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46 // 0xffffffff00000001 |
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47 return s2.equals(s1); |
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48 } |
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49 |
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50 // Same thing with String.compareTo() |
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51 int m2(String s1) { |
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52 int l = v2 - v1; |
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53 char[] arr = new char[l+1]; |
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54 arr[0] = 'a'; |
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55 arr[1] = 'b'; |
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56 String s2 = new String(arr); |
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57 return s2.compareTo(s1); |
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58 } |
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59 |
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60 // Same thing with equals() for arrays |
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61 boolean m3(char[] arr1) { |
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62 int l = v2 - v1; // 0 - (-1) = 1. On 64 bit: 0xffffffff00000001 |
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63 char[] arr2 = new char[l]; |
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64 arr2[0] = 'a'; |
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65 return Arrays.equals(arr2, arr1); |
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66 } |
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67 |
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68 static public void main(String[] args) { |
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69 TestStringEqualsBadLength tse = new TestStringEqualsBadLength(); |
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70 tse.v1 = -1; |
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71 tse.v2 = 0; |
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72 char[] arr = new char[1]; |
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73 arr[0] = 'a'; |
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74 for (int i = 0; i < 20000; i++) { |
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75 tse.m("a"); |
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76 tse.m2("ab"); |
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77 tse.m3(arr); |
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78 } |
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79 |
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80 System.out.println("TEST PASSED"); |
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81 } |
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82 } |