9e8a3585b0
Reserved memory had PROT_READ+PROT_WRITE access on Linux/bsd, now changed to PROT_NONE. Reviewed-by: dholmes, ctornqvi
79 lines
2.6 KiB
Java
79 lines
2.6 KiB
Java
/*
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* Copyright (c) 2013, Oracle and/or its affiliates. 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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/*
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* @test
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* @key regression
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* @bug 8012015
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* @summary Make sure reserved (but uncommitted) memory is not accessible
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* @library /testlibrary /testlibrary/whitebox
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* @build ReserveMemory
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* @run main ClassFileInstaller sun.hotspot.WhiteBox
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* @run main ReserveMemory
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*/
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import com.oracle.java.testlibrary.*;
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import java.lang.reflect.Field;
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import sun.hotspot.WhiteBox;
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import sun.misc.Unsafe;
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public class ReserveMemory {
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private static Unsafe getUnsafe() throws Exception {
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Field f = Unsafe.class.getDeclaredField("theUnsafe");
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f.setAccessible(true);
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return (Unsafe)f.get(null);
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}
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private static boolean isWindows() {
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return System.getProperty("os.name").toLowerCase().startsWith("win");
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}
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public static void main(String args[]) throws Exception {
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if (args.length > 0) {
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long address = WhiteBox.getWhiteBox().reserveMemory(4096);
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System.out.println("Reserved memory at address: 0x" + Long.toHexString(address));
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System.out.println("Will now read from the address, expecting a crash!");
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int x = getUnsafe().getInt(address);
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throw new Exception("Read of reserved/uncommitted memory unexpectedly succeeded, expected crash!");
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}
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ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
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"-Xbootclasspath/a:.",
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"-XX:+UnlockDiagnosticVMOptions",
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"-XX:+WhiteBoxAPI",
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"ReserveMemory",
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"test");
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OutputAnalyzer output = new OutputAnalyzer(pb.start());
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if (isWindows()) {
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output.shouldContain("EXCEPTION_ACCESS_VIOLATION");
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} else {
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output.shouldContain("SIGSEGV");
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}
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}
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}
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