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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.
This commit is contained in:
russell@unturf.com 2026-03-26 17:11:57 -04:00
commit 0a580b313d
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151
test/jdk/java/security/SecureClassLoader/DefineClassByteBuffer.java Normal file
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/*
* Copyright (c) 2003, 2011, 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 4894899 7054428
* @summary Test various cases of passing java.nio.ByteBuffers
* to defineClass().
*
* @build DefineClassByteBuffer TestClass
* @run main DefineClassByteBuffer
*/
import java.security.*;
import java.nio.*;
import java.nio.channels.*;
import java.io.*;
public class DefineClassByteBuffer {
static void test(ClassLoader cl) throws Exception {
Class c = Class.forName("TestClass", true, cl);
if (!"TestClass".equals(c.getName())) {
throw new RuntimeException("Got wrong class: " + c);
}
}
public static void main(String arg[]) throws Exception {
// Rename the compiled TestClass.class file to something else,
// otherwise it would be loaded by the parent class loader and
// DummyClassLoader will never be used, especially in /othervm mode.
File oldFile = new File(System.getProperty("test.classes", "."),
"TestClass.class");
File newFile = new File(System.getProperty("test.classes", "."),
"CLAZZ");
oldFile.renameTo(newFile);
ClassLoader[] cls = new ClassLoader[DummyClassLoader.MAX_TYPE];
for (int i = 0; i < cls.length; i++) {
cls[i] = new DummyClassLoader(i);
}
/* Create several instances of the class using different classloaders,
which are using different types of ByteBuffer. */
for (int i = 0; i < cls.length; i++) {
test(cls[i]);
}
if (DummyClassLoader.count != cls.length) {
throw new Exception("DummyClassLoader not always used");
}
}
/** Always loads the same class, using various types of ByteBuffers */
public static class DummyClassLoader extends SecureClassLoader {
public static final String CLASS_NAME = "TestClass";
public static final int MAPPED_BUFFER = 0;
public static final int DIRECT_BUFFER = 1;
public static final int ARRAY_BUFFER = 2;
public static final int WRAPPED_BUFFER = 3;
public static final int READ_ONLY_ARRAY_BUFFER = 4;
public static final int READ_ONLY_DIRECT_BUFFER = 5;
public static final int DUP_ARRAY_BUFFER = 6;
public static final int DUP_DIRECT_BUFFER = 7;
public static final int MAX_TYPE = 7;
int loaderType;
static int count = 0;
DummyClassLoader(int loaderType) {
this.loaderType = loaderType;
}
static ByteBuffer[] buffers = new ByteBuffer[MAX_TYPE + 1];
static ByteBuffer readClassFile(String name) {
try {
File f = new File(System.getProperty("test.classes", "."),
"CLAZZ");
try (FileInputStream fin = new FileInputStream(f);
FileChannel fc = fin.getChannel()) {
return fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
}
} catch (FileNotFoundException e) {
throw new RuntimeException("Can't open file: " + name, e);
} catch (IOException e) {
throw new RuntimeException("Can't open file: " + name, e);
}
}
static {
/* create a bunch of different ByteBuffers, starting with a mapped
buffer from a class file, and create various duplicate and wrapped
buffers. */
buffers[MAPPED_BUFFER] = readClassFile(CLASS_NAME + ".class");
byte[] array = new byte[buffers[MAPPED_BUFFER].limit()];
buffers[MAPPED_BUFFER].get(array);
buffers[MAPPED_BUFFER].flip();
buffers[DIRECT_BUFFER] = ByteBuffer.allocateDirect(array.length);
buffers[DIRECT_BUFFER].put(array);
buffers[DIRECT_BUFFER].flip();
buffers[ARRAY_BUFFER] = ByteBuffer.allocate(array.length);
buffers[ARRAY_BUFFER].put(array);
buffers[ARRAY_BUFFER].flip();
buffers[WRAPPED_BUFFER] = ByteBuffer.wrap(array);
buffers[READ_ONLY_ARRAY_BUFFER] = buffers[ARRAY_BUFFER].asReadOnlyBuffer();
buffers[READ_ONLY_DIRECT_BUFFER] = buffers[DIRECT_BUFFER].asReadOnlyBuffer();
buffers[DUP_ARRAY_BUFFER] = buffers[ARRAY_BUFFER].duplicate();
buffers[DUP_DIRECT_BUFFER] = buffers[DIRECT_BUFFER].duplicate();
}
public Class findClass(String name) {
CodeSource cs = null;
count++;
return defineClass(name, buffers[loaderType], cs);
}
} /* DummyClassLoader */
} /* DefineClassByteBuffer */