1 /*
   2  * Copyright (c) 2013, 2020, 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  * @summary Test that touching noaccess area in class ReservedHeapSpace results in SIGSEGV/ACCESS_VIOLATION
  27  * @library /test/lib
  28  * @modules java.base/jdk.internal.misc
  29  *          java.management
  30  * @build sun.hotspot.WhiteBox
  31  * @run driver ClassFileInstaller sun.hotspot.WhiteBox
  32  * @run main ReadFromNoaccessArea
  33  */
  34 
  35 import jdk.test.lib.Platform;
  36 import jdk.test.lib.process.ProcessTools;
  37 import jdk.test.lib.process.OutputAnalyzer;
  38 import sun.hotspot.WhiteBox;
  39 
  40 public class ReadFromNoaccessArea {
  41 
  42   public static void main(String args[]) throws Exception {
  43     if (!Platform.is64bit()) {
  44       System.out.println("ReadFromNoaccessArea tests is useful only on 64bit architecture. Passing silently.");
  45       return;
  46     }
  47 
  48     ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  49           "-Xbootclasspath/a:.",
  50           "-XX:+UnlockDiagnosticVMOptions",
  51           "-XX:+WhiteBoxAPI",
  52           "-XX:+UseCompressedOops",
  53           "-XX:HeapBaseMinAddress=33G",
  54           "-XX:-CreateCoredumpOnCrash",
  55           "-Xmx128m",
  56           DummyClassWithMainTryingToReadFromNoaccessArea.class.getName());
  57 
  58     OutputAnalyzer output = new OutputAnalyzer(pb.start());
  59     System.out.println("******* Printing stdout for analysis in case of failure *******");
  60     System.out.println(output.getStdout());
  61     System.out.println("******* Printing stderr for analysis in case of failure *******");
  62     System.out.println(output.getStderr());
  63     System.out.println("***************************************************************");
  64     if (output.getStdout() != null && output.getStdout().contains("WB_ReadFromNoaccessArea method is useless")) {
  65       // Test conditions broken. There is no protected page in ReservedHeapSpace in these circumstances. Silently passing test.
  66       return;
  67     }
  68     if (Platform.isWindows()) {
  69       output.shouldContain("EXCEPTION_ACCESS_VIOLATION");
  70     } else if (Platform.isOSX()) {
  71       output.shouldContain("SIGBUS");
  72     } else {
  73       output.shouldContain("SIGSEGV");
  74     }
  75   }
  76 
  77   public static class DummyClassWithMainTryingToReadFromNoaccessArea {
  78 
  79     // This method calls whitebox method reading from noaccess area
  80     public static void main(String args[]) throws Exception {
  81       WhiteBox.getWhiteBox().readFromNoaccessArea();
  82       throw new Exception("Call of readFromNoaccessArea succeeded! This is wrong. Crash expected. Test failed.");
  83     }
  84   }
  85 
  86 }