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comparison 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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8709:255c0a4cb4eb 8710:9058789475af
1 /*
2 * Copyright (c) 2002-2013, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2011 SAP AG. All Rights Reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 */
24
25 class TestMT {
26
27 static boolean loadLib(String libName) {
28 try {
29 System.loadLibrary(libName);
30 System.out.println("Loaded library "+ libName + ".");
31 return true;
32 } catch (SecurityException e) {
33 System.out.println("loadLibrary(\"" + libName + "\") throws: " + e + "\n");
34 } catch (UnsatisfiedLinkError e) {
35 System.out.println("loadLibrary(\"" + libName + "\") throws: " + e + "\n");
36 }
37 return false;
38 }
39
40 public static int counter = 1;
41 static int Runner() {
42 counter = counter * -1;
43 int i = counter;
44 if (counter < 2) counter += Runner();
45 return i;
46 }
47
48 public static int run(String msg) {
49 try {
50 Runner();
51 } catch (StackOverflowError e) {
52 System.out.println(msg + " caught stack overflow error.");
53 return 0;
54 } catch (OutOfMemoryError e) {
55 return 0;
56 }
57 return 2;
58 }
59
60 public static void main(String argv[]) {
61 try {
62 for (int i = 0; i < 20; i++) {
63 Thread t = new DoStackOverflow("SpawnedThread " + i);
64 t.start();
65 }
66 run("Main thread");
67 loadLib("test-rwx");
68 run("Main thread");
69 } catch (Exception e) {
70 System.out.println(e);
71 }
72 }
73
74 static class DoStackOverflow extends Thread {
75 public DoStackOverflow(String name) {
76 super(name);
77 }
78 public void run() {
79 for (int i = 0; i < 10; ++i) {
80 TestMT.run(getName());
81 yield();
82 }
83 }
84 }
85 }