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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
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test/jdk/java/lang/invoke/CallerSensitiveMethodHandle.java Normal file
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/*
* Copyright (c) 2021, 2025, 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
* @run junit/othervm CallerSensitiveMethodHandle
* @summary Check Lookup findVirtual, findStatic and unreflect behavior with
* caller sensitive methods with focus on AccessibleObject.setAccessible
*/
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodHandles.Lookup;
import java.lang.reflect.Field;
import static java.lang.invoke.MethodType.*;
import static org.junit.jupiter.api.Assertions.*;
import org.junit.jupiter.api.Test;
public class CallerSensitiveMethodHandle {
private static int field = 0;
@Test
public void privateField() throws Throwable {
Lookup l = MethodHandles.lookup();
Field f = CallerSensitiveMethodHandle.class.getDeclaredField("field");
MethodHandle mh = l.findVirtual(Field.class, "setInt", methodType(void.class, Object.class, int.class));
int newValue = 5;
mh.invokeExact(f, (Object) null, newValue);
assertEquals(newValue, field);
}
@Test
public void lookupItself() throws Throwable {
Lookup lookup = MethodHandles.lookup();
MethodHandle MH_lookup2 = lookup.findStatic(MethodHandles.class, "lookup", methodType(Lookup.class));
Lookup lookup2 = (Lookup) MH_lookup2.invokeExact();
System.out.println(lookup2 + " original lookup class " + lookup.lookupClass());
assertSame(lookup.lookupClass(), lookup2.lookupClass());
}
}