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

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.
2026-03-26 17:11:57 -04:00 · 2026-03-26 17:11:57 -04:00 · 0a580b313d
commit 0a580b313d
70422 changed files with 17213626 additions and 0 deletions
--- a/test/jdk/java/io/Serializable/unnamedPackageSwitch/UnnamedPackageSwitchTest.java
+++ b/test/jdk/java/io/Serializable/unnamedPackageSwitch/UnnamedPackageSwitchTest.java
@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2000, 2019, 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 4348213
+ * @build UnnamedPackageSwitchTest pkg.A
+ * @run main UnnamedPackageSwitchTest
+ * @summary Verify that deserialization allows an incoming class descriptor
+ *          representing a class in the unnamed package to be resolved to a
+ *          local class with the same name in a named package, and vice-versa.
+ */
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.InputStream;
+import java.io.IOException;
+import java.io.ObjectOutputStream;
+import java.io.ObjectInputStream;
+import java.io.ObjectStreamClass;
+import java.io.Serializable;
+
+class A implements Serializable {
+    private static final long serialVersionUID = 0L;
+}
+
+class TestObjectInputStream extends ObjectInputStream {
+    TestObjectInputStream(InputStream in) throws IOException { super(in); }
+    protected Class<?> resolveClass(ObjectStreamClass desc)
+        throws IOException, ClassNotFoundException
+    {
+        String name = desc.getName();
+        if (name.equals("A")) {
+            return pkg.A.class;
+        } else if (name.equals("pkg.A")) {
+            return A.class;
+        } else {
+            return super.resolveClass(desc);
+        }
+    }
+}
+
+public class UnnamedPackageSwitchTest {
+    public static void main(String[] args) throws Exception {
+        ByteArrayOutputStream bout = new ByteArrayOutputStream();
+        ObjectOutputStream oout = new ObjectOutputStream(bout);
+        oout.writeObject(new A());
+        oout.writeObject(new pkg.A());
+        oout.close();
+
+        ObjectInputStream oin = new TestObjectInputStream(
+            new ByteArrayInputStream(bout.toByteArray()));
+        oin.readObject();
+        oin.readObject();
+    }
+}