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10157
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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 * @key regression
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27 * @bug 8012015
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28 * @summary Make sure reserved (but uncommitted) memory is not accessible
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29 * @library /testlibrary /testlibrary/whitebox
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30 * @build ReserveMemory
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31 * @run main ClassFileInstaller sun.hotspot.WhiteBox
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32 * @run main ReserveMemory
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33 */
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34
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35 import com.oracle.java.testlibrary.*;
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36
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37 import java.lang.reflect.Field;
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38 import sun.hotspot.WhiteBox;
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39 import sun.misc.Unsafe;
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40
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41 public class ReserveMemory {
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42 private static Unsafe getUnsafe() throws Exception {
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43 Field f = Unsafe.class.getDeclaredField("theUnsafe");
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44 f.setAccessible(true);
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45 return (Unsafe)f.get(null);
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46 }
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47
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48 private static boolean isWindows() {
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49 return System.getProperty("os.name").toLowerCase().startsWith("win");
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50 }
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51
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52 public static void main(String args[]) throws Exception {
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53 if (args.length > 0) {
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54 long address = WhiteBox.getWhiteBox().reserveMemory(4096);
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55
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56 System.out.println("Reserved memory at address: 0x" + Long.toHexString(address));
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57 System.out.println("Will now read from the address, expecting a crash!");
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58
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59 int x = getUnsafe().getInt(address);
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60
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61 throw new Exception("Read of reserved/uncommitted memory unexpectedly succeeded, expected crash!");
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62 }
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63
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64 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
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65 "-Xbootclasspath/a:.",
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66 "-XX:+UnlockDiagnosticVMOptions",
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67 "-XX:+WhiteBoxAPI",
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68 "ReserveMemory",
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69 "test");
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70
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71 OutputAnalyzer output = new OutputAnalyzer(pb.start());
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72 if (isWindows()) {
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73 output.shouldContain("EXCEPTION_ACCESS_VIOLATION");
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74 } else {
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75 output.shouldContain("SIGSEGV");
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76 }
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77 }
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78 }
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