90 lines
3.2 KiB
Java
90 lines
3.2 KiB
Java
/*
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* Copyright (c) 2023, 2024, 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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import java.io.*;
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import java.util.Arrays;
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import java.util.Objects;
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import java.util.Random;
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/*
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* @test
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* @bug 8320971
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* @summary Verify BufferedInputStream.buf is used directly by
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* BufferedInputStream.implTransferTo() only when its OutputStream
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* parameter is trusted
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* @key randomness
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* @run main/othervm --add-opens=java.base/java.io=ALL-UNNAMED TransferToTrusted
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*/
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public class TransferToTrusted {
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private static final Random RND = new Random(System.nanoTime());
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private static final class UntrustedOutputStream extends OutputStream {
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UntrustedOutputStream() {
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super();
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}
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@Override
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public void write(byte[] b, int off, int len) {
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Objects.checkFromIndexSize(off, len, b.length);
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byte[] tmp = new byte[len];
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RND.nextBytes(tmp);
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System.arraycopy(tmp, 0, b, off, len);
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}
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@Override
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public void write(int b) throws IOException {
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write(new byte[]{(byte) b});
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}
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}
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public static void main(String[] args) throws Exception {
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final int length = 128;
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byte[] buf = new byte[length];
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RND.nextBytes(buf);
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var outputStreams = new OutputStream[]{
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new ByteArrayOutputStream(),
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new FileOutputStream(File.createTempFile(TransferToTrusted.class.getName(), null)),
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new PipedOutputStream(new PipedInputStream(length)),
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new UntrustedOutputStream()
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};
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for (var out : outputStreams) {
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System.err.println("out: " + out.getClass().getName());
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var bis = new BufferedInputStream(new ByteArrayInputStream(buf.clone()));
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try (out; bis) {
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bis.read();//need this to fill the BIS.buf in
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bis.transferTo(out);
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var internalBuffer = bis.getClass().getDeclaredField("buf");
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internalBuffer.setAccessible(true);
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if (!Arrays.equals(buf, Arrays.copyOf((byte[]) internalBuffer.get(bis), length))) {
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throw new RuntimeException("Internal buffer was modified");
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}
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}
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}
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}
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}
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