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undefect. CWE-407 — 63 sites patched across 27 ecosystems

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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.
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russell@unturf.com 2026-03-26 17:11:57 -04:00
commit 0a580b313d
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test/jdk/java/nio/MappedByteBuffer/ForceException.java Normal file
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/*
* Copyright (c) 2021, 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.
*/
/* @test
* @bug 6539707
* @summary Test behavior of force() with respect to throwing exceptions
* @run main ForceException
*/
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.io.UncheckedIOException;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
public class ForceException {
public static void main(String[] args) throws IOException {
int blockSize = 2048 * 1024;
int numberOfBlocks = 200;
int fileLength = numberOfBlocks * blockSize;
File file = new File(".", "test.dat");
file.deleteOnExit();
try (RandomAccessFile raf = new RandomAccessFile(file, "rw")) {
raf.setLength(fileLength);
int pos = (numberOfBlocks - 1) * blockSize;
int size = (int)Math.min(blockSize, fileLength - pos);
MappedByteBuffer mbb =
raf.getChannel().map(FileChannel.MapMode.READ_WRITE, pos, size);
System.out.printf("Write region 0x%s..0x%s%n",
Long.toHexString(pos), Long.toHexString(size));
for (int k = 0; k < mbb.limit(); k++) {
mbb.put(k, (byte)65);
}
// Catch and process UncheckedIOException; other Throwables fail
try {
System.out.println("Force");
mbb.force();
} catch (UncheckedIOException legal) {
System.out.printf("Caught legal exception %s%n", legal);
IOException cause = legal.getCause(); // can't be null
// Throw the cause if flush failed (should be only on Windows)
if (cause.getMessage().startsWith("Flush failed")) {
throw cause;
}
}
System.out.println("OK");
}
}
}