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/*
* Copyright (c) 2023, 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.
*/
/*
* @test
* @bug 8321053
* @summary Verify ByteArrayInputStream.buf is used directly by
* ByteArrayInputStream.transferTo only when its OutputStream
* parameter is trusted
* @key randomness
*/
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.Objects;
import java.util.Random;
public class TransferToTrusted {
private static final Random RND = new Random(System.nanoTime());
private static class UntrustedOutputStream extends OutputStream {
UntrustedOutputStream() {
super();
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
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 IOException {
byte[] buf = new byte[RND.nextInt(1025)];
System.out.println("buf.length: " + buf.length);
RND.nextBytes(buf);
byte[] dup = Arrays.copyOf(buf, buf.length);
ByteArrayInputStream bais = new ByteArrayInputStream(dup);
bais.mark(dup.length);
OutputStream[] outputStreams = new OutputStream[] {
new ByteArrayOutputStream(),
new UntrustedOutputStream()
};
for (OutputStream out : outputStreams) {
System.err.println("out: " + out.getClass().getName());
bais.transferTo(out);
bais.reset();
try {
if (!Arrays.equals(buf, bais.readAllBytes()))
throw new RuntimeException("Internal buffer was modified");
} finally {
out.close();
}
bais.reset();
}
}
}
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