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comparison test/runtime/memory/ReserveMemory.java @ 10157:f32b6c267d2e

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8012015: Use PROT_NONE when reserving memory Summary: Reserved memory had PROT_READ+PROT_WRITE access on Linux/bsd, now changed to PROT_NONE. Reviewed-by: dholmes, ctornqvi
author mikael
date Mon, 29 Apr 2013 11:03:49 -0700
parents
children f54c85acc043
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10156:c53e49efe6a8 10157:f32b6c267d2e
1 /*
2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /*
25 * @test
26 * @key regression
27 * @bug 8012015
28 * @summary Make sure reserved (but uncommitted) memory is not accessible
29 * @library /testlibrary /testlibrary/whitebox
30 * @build ReserveMemory
31 * @run main ClassFileInstaller sun.hotspot.WhiteBox
32 * @run main ReserveMemory
33 */
34
35 import com.oracle.java.testlibrary.*;
36
37 import java.lang.reflect.Field;
38 import sun.hotspot.WhiteBox;
39 import sun.misc.Unsafe;
40
41 public class ReserveMemory {
42 private static Unsafe getUnsafe() throws Exception {
43 Field f = Unsafe.class.getDeclaredField("theUnsafe");
44 f.setAccessible(true);
45 return (Unsafe)f.get(null);
46 }
47
48 private static boolean isWindows() {
49 return System.getProperty("os.name").toLowerCase().startsWith("win");
50 }
51
52 public static void main(String args[]) throws Exception {
53 if (args.length > 0) {
54 long address = WhiteBox.getWhiteBox().reserveMemory(4096);
55
56 System.out.println("Reserved memory at address: 0x" + Long.toHexString(address));
57 System.out.println("Will now read from the address, expecting a crash!");
58
59 int x = getUnsafe().getInt(address);
60
61 throw new Exception("Read of reserved/uncommitted memory unexpectedly succeeded, expected crash!");
62 }
63
64 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
65 "-Xbootclasspath/a:.",
66 "-XX:+UnlockDiagnosticVMOptions",
67 "-XX:+WhiteBoxAPI",
68 "ReserveMemory",
69 "test");
70
71 OutputAnalyzer output = new OutputAnalyzer(pb.start());
72 if (isWindows()) {
73 output.shouldContain("EXCEPTION_ACCESS_VIOLATION");
74 } else {
75 output.shouldContain("SIGSEGV");
76 }
77 }
78 }