russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
79 lines
3 KiB
Java
79 lines
3 KiB
Java
/*
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* Copyright (c) 2025, 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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* @bug 8365203
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* @summary Tests guarding of ByteBuffers in ClassLoader::defineClass
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* @run junit TestGuardByteBuffer
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*/
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import org.junit.jupiter.api.Test;
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import java.lang.foreign.Arena;
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import java.util.HexFormat;
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import static org.junit.jupiter.api.Assertions.*;
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final class TestGuardByteBuffer {
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@Test
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void guardCrash() {
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final byte[] classBytes = getClassBytes(); // get bytes of a valid class
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final var cl = new ClassLoader() {
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void tryCrash() {
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var arena = Arena.ofConfined();
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var byteBuffer = arena.allocate(classBytes.length).asByteBuffer();
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// Close the arena underneath
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arena.close();
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// expected to always fail because the arena
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// from which the ByteBuffer was constructed
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// has been closed
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assertThrows(IllegalStateException.class,
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() -> defineClass(null, byteBuffer, null));
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}
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};
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for (int i = 0; i < 10_000; i++) {
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cl.tryCrash();
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}
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}
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private static byte[] getClassBytes() {
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// unused. this is here just for reference
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final String source = """
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public class NoOp {}
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""";
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// (externally) compiled content of the above "source", represented as hex
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final String classBytesHex = """
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cafebabe00000044000d0a000200030700040c000500060100106a6176612f
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6c616e672f4f626a6563740100063c696e69743e0100032829560700080100
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044e6f4f70010004436f646501000f4c696e654e756d6265725461626c6501
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000a536f7572636546696c650100094e6f4f702e6a61766100210007000200
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0000000001000100050006000100090000001d00010001000000052ab70001
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b100000001000a000000060001000000010001000b00000002000c
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""";
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return HexFormat.of().parseHex(classBytesHex.replaceAll("\n", ""));
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}
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}
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