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annotate test/runtime/7107135/TestMT.java @ 8710:9058789475af

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7107135: Stack guard pages are no more protected after loading a shared library with executable stack Summary: Detect the execstack attribute of the loaded library and attempt to fix the stack guard using Safepoint op. Reviewed-by: dholmes, zgu Contributed-by: ioi.lam@oracle.com
author iklam
date Tue, 05 Mar 2013 13:55:56 -0800
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1 /*
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2 * Copyright (c) 2002-2013, Oracle and/or its affiliates. All rights reserved.
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3 * Copyright (c) 2011 SAP AG. All Rights Reserved.
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 *
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6 * This code is free software; you can redistribute it and/or modify it
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7 * under the terms of the GNU General Public License version 2 only, as
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8 * published by the Free Software Foundation.
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9 *
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10 * This code is distributed in the hope that it will be useful, but WITHOUT
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 * version 2 for more details (a copy is included in the LICENSE file that
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14 * accompanied this code).
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15 *
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16 * You should have received a copy of the GNU General Public License version
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17 * 2 along with this work; if not, write to the Free Software Foundation,
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 *
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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21 * or visit www.oracle.com if you need additional information or have any
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22 * questions.
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23 */
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24
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25 class TestMT {
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26
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27 static boolean loadLib(String libName) {
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28 try {
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29 System.loadLibrary(libName);
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30 System.out.println("Loaded library "+ libName + ".");
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31 return true;
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32 } catch (SecurityException e) {
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33 System.out.println("loadLibrary(\"" + libName + "\") throws: " + e + "\n");
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34 } catch (UnsatisfiedLinkError e) {
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35 System.out.println("loadLibrary(\"" + libName + "\") throws: " + e + "\n");
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36 }
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37 return false;
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38 }
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39
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40 public static int counter = 1;
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41 static int Runner() {
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42 counter = counter * -1;
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43 int i = counter;
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44 if (counter < 2) counter += Runner();
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45 return i;
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46 }
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47
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48 public static int run(String msg) {
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49 try {
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50 Runner();
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51 } catch (StackOverflowError e) {
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52 System.out.println(msg + " caught stack overflow error.");
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53 return 0;
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54 } catch (OutOfMemoryError e) {
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55 return 0;
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56 }
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57 return 2;
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58 }
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59
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60 public static void main(String argv[]) {
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61 try {
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62 for (int i = 0; i < 20; i++) {
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63 Thread t = new DoStackOverflow("SpawnedThread " + i);
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64 t.start();
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65 }
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66 run("Main thread");
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67 loadLib("test-rwx");
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68 run("Main thread");
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69 } catch (Exception e) {
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70 System.out.println(e);
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71 }
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72 }
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73
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74 static class DoStackOverflow extends Thread {
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75 public DoStackOverflow(String name) {
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76 super(name);
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77 }
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78 public void run() {
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79 for (int i = 0; i < 10; ++i) {
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80 TestMT.run(getName());
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81 yield();
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82 }
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83 }
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84 }
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85 }