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/*
* Copyright (c) 2023, 2024, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import java.io.*;
import java.util.Arrays;
import java.util.Objects;
import java.util.Random;
/*
* @test
* @bug 8320971
* @summary Verify BufferedInputStream.buf is used directly by
* BufferedInputStream.implTransferTo() only when its OutputStream
* parameter is trusted
* @key randomness
* @run main/othervm --add-opens=java.base/java.io=ALL-UNNAMED TransferToTrusted
*/
public class TransferToTrusted {
private static final Random RND = new Random(System.nanoTime());
private static final class UntrustedOutputStream extends OutputStream {
UntrustedOutputStream() {
super();
}
@Override
public void write(byte[] b, int off, int len) {
Objects.checkFromIndexSize(off, len, b.length);
byte[] tmp = new byte[len];
RND.nextBytes(tmp);
System.arraycopy(tmp, 0, b, off, len);
}
@Override
public void write(int b) throws IOException {
write(new byte[]{(byte) b});
}
}
public static void main(String[] args) throws Exception {
final int length = 128;
byte[] buf = new byte[length];
RND.nextBytes(buf);
var outputStreams = new OutputStream[]{
new ByteArrayOutputStream(),
new FileOutputStream(File.createTempFile(TransferToTrusted.class.getName(), null)),
new PipedOutputStream(new PipedInputStream(length)),
new UntrustedOutputStream()
};
for (var out : outputStreams) {
System.err.println("out: " + out.getClass().getName());
var bis = new BufferedInputStream(new ByteArrayInputStream(buf.clone()));
try (out; bis) {
bis.read();//need this to fill the BIS.buf in
bis.transferTo(out);
var internalBuffer = bis.getClass().getDeclaredField("buf");
internalBuffer.setAccessible(true);
if (!Arrays.equals(buf, Arrays.copyOf((byte[]) internalBuffer.get(bis), length))) {
throw new RuntimeException("Internal buffer was modified");
}
}
}
}
}
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