hotspot/test/runtime/7107135/TestMT.java
author iklam
Tue, 05 Mar 2013 13:55:56 -0800
changeset 15926 8e87d545195f
child 35594 cc13089c6327
permissions -rw-r--r--
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
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/*
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 * Copyright (c) 2002-2013, Oracle and/or its affiliates. All rights reserved.
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 * Copyright (c) 2011 SAP AG.  All Rights Reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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class TestMT {
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    static boolean loadLib(String libName) {
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        try {
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            System.loadLibrary(libName);
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            System.out.println("Loaded library "+ libName + ".");
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            return true;
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        } catch (SecurityException e) {
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            System.out.println("loadLibrary(\"" + libName + "\") throws: " + e + "\n");
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        } catch (UnsatisfiedLinkError e) {
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            System.out.println("loadLibrary(\"" + libName + "\") throws: " + e + "\n");
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        }
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        return false;
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    }
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    public static int counter        = 1;
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    static int Runner() {
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        counter = counter * -1;
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        int i = counter;
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        if (counter < 2) counter += Runner();
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        return i;
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    }
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    public static int run(String msg) {
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        try {
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            Runner();
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        } catch (StackOverflowError e) {
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            System.out.println(msg + " caught stack overflow error.");
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            return 0;
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        } catch (OutOfMemoryError e) {
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            return 0;
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        }
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        return 2;
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    }
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    public static void main(String argv[]) {
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        try {
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            for (int i = 0; i < 20; i++) {
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                Thread t = new DoStackOverflow("SpawnedThread " + i);
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                t.start();
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            }
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            run("Main thread");
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            loadLib("test-rwx");
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            run("Main thread");
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        } catch (Exception e) {
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            System.out.println(e);
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        }
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    }
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    static class DoStackOverflow extends Thread {
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        public DoStackOverflow(String name) {
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            super(name);
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        }
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        public void run() {
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            for (int i = 0; i < 10; ++i) {
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                TestMT.run(getName());
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                yield();
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            }
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        }
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    }
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}