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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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77
test/hotspot/jtreg/runtime/HiddenClasses/NestedHidden.java Normal file
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/*
* Copyright (c) 2020, 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
* @summary Creates a hidden class inside of a hidden class.
* @library /test/lib
* @modules jdk.compiler
* @run main p.NestedHidden
*/
package p;
import java.lang.*;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodHandles.Lookup;
import static java.lang.invoke.MethodHandles.Lookup.ClassOption.*;
import jdk.test.lib.compiler.InMemoryJavaCompiler;
// Test that a hidden class can define its own hidden class by calling
// lookup.defineHiddenClass().
public class NestedHidden {
static byte klassbuf[] = InMemoryJavaCompiler.compile("p.TestClass",
"package p; " +
"public class TestClass { " +
" public static void concat(String one, String two) throws Throwable { " +
" System.out.println(one + two);" +
" } } ");
public static void main(String args[]) throws Exception {
// The hidden class calls lookup.defineHiddenClass(), creating a nested hidden class.
byte klassbuf2[] = InMemoryJavaCompiler.compile("p.TestClass2",
"package p; " +
"import java.lang.invoke.MethodHandles; " +
"import java.lang.invoke.MethodHandles.Lookup; " +
"import static java.lang.invoke.MethodHandles.Lookup.ClassOption.*; " +
"public class TestClass2 { " +
" public static void doit() throws Throwable { " +
" Lookup lookup = MethodHandles.lookup(); " +
" Class<?> klass2 = lookup.defineHiddenClass(p.NestedHidden.klassbuf, true, NESTMATE).lookupClass(); " +
" Class[] dArgs = new Class[2]; " +
" dArgs[0] = String.class; " +
" dArgs[1] = String.class; " +
" try { " +
" klass2.getMethod(\"concat\", dArgs).invoke(null, \"CC\", \"DD\"); " +
" } catch (Throwable ex) { " +
" throw new RuntimeException(\"Exception: \" + ex.toString()); " +
" } " +
"} } ");
Lookup lookup = MethodHandles.lookup();
Class<?> klass2 = lookup.defineHiddenClass(klassbuf2, true, NESTMATE).lookupClass();
klass2.getMethod("doit").invoke(null);
}
}