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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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176
test/jdk/java/lang/invoke/lookup/SpecialStatic.java Normal file
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/*
* Copyright (c) 2014, 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
* @bug 8032400
* @summary JSR292: invokeSpecial: InternalError attempting to lookup a method
* @compile -XDignore.symbol.file SpecialStatic.java
* @run junit test.java.lang.invoke.lookup.SpecialStatic
*/
package test.java.lang.invoke.lookup;
import java.lang.classfile.ClassFile;
import java.lang.constant.ClassDesc;
import java.lang.constant.MethodHandleDesc;
import java.lang.constant.MethodTypeDesc;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.lang.reflect.AccessFlag;
import static java.lang.classfile.ClassFile.ACC_PUBLIC;
import static java.lang.classfile.ClassFile.ACC_STATIC;
import static java.lang.constant.ConstantDescs.*;
import static java.lang.constant.DirectMethodHandleDesc.Kind.SPECIAL;
import static org.junit.jupiter.api.Assertions.*;
import org.junit.jupiter.api.Test;
/**
* Test case:
* class T1 { int m() { return 1; }}
* class T2 extends T1 { static int m() { return 2; }}
* class T3 extends T2 { int m() { return 3; }}
*
* T3::test { invokespecial T1.m() T3 } ==> T1::m
*/
public class SpecialStatic {
static class CustomClassLoader extends ClassLoader {
public Class<?> loadClass(String name) throws ClassNotFoundException {
if (findLoadedClass(name) != null) {
return findLoadedClass(name);
}
if ("T1".equals(name)) {
byte[] classFile = dumpT1();
return defineClass("T1", classFile, 0, classFile.length);
}
if ("T2".equals(name)) {
byte[] classFile = dumpT2();
return defineClass("T2", classFile, 0, classFile.length);
}
if ("T3".equals(name)) {
byte[] classFile = dumpT3();
return defineClass("T3", classFile, 0, classFile.length);
}
return super.loadClass(name);
}
}
private static ClassLoader cl = new CustomClassLoader();
private static Class t1, t3;
private static final MethodTypeDesc MTD_int = MethodTypeDesc.of(CD_int);
private static final MethodTypeDesc MTD_Lookup = MethodTypeDesc.of(CD_MethodHandles_Lookup);
private static final String METHOD_NAME = "m";
private static final ClassDesc CD_T1 = ClassDesc.of("T1");
private static final ClassDesc CD_T2 = ClassDesc.of("T2");
private static final ClassDesc CD_T3 = ClassDesc.of("T3");
static {
try {
t1 = cl.loadClass("T1");
t3 = cl.loadClass("T3");
} catch (ClassNotFoundException e) {
throw new Error(e);
}
}
public static void main(String[] args) throws Throwable {
SpecialStatic test = new SpecialStatic();
test.testConstant();
test.testFindSpecial();
}
@Test
public void testConstant() throws Throwable {
MethodHandle mh = (MethodHandle)t3.getDeclaredMethod("getMethodHandle").invoke(null);
int result = (int)mh.invoke(t3.newInstance());
assertEquals(1, result); // T1.m should be invoked.
}
@Test
public void testFindSpecial() throws Throwable {
MethodHandles.Lookup lookup = (MethodHandles.Lookup)t3.getDeclaredMethod("getLookup").invoke(null);
MethodHandle mh = lookup.findSpecial(t1, "m", MethodType.methodType(int.class), t3);
int result = (int)mh.invoke(t3.newInstance());
assertEquals(1, result); // T1.m should be invoked.
}
public static byte[] dumpT1() {
return ClassFile.of().build(CD_T1, clb -> {
clb.withSuperclass(CD_Object);
clb.withFlags(AccessFlag.PUBLIC, AccessFlag.SUPER);
clb.withMethodBody(INIT_NAME, MTD_void, ACC_PUBLIC, cob -> {
cob.aload(0);
cob.invokespecial(CD_Object, INIT_NAME, MTD_void);
cob.return_();
});
clb.withMethodBody(METHOD_NAME, MTD_int, ACC_PUBLIC, cob -> {
cob.bipush(1);
cob.ireturn();
});
});
}
public static byte[] dumpT2() {
return ClassFile.of().build(CD_T2, clb -> {
clb.withSuperclass(CD_T1);
clb.withFlags(AccessFlag.PUBLIC, AccessFlag.SUPER);
clb.withMethodBody(INIT_NAME, MTD_void, ACC_PUBLIC, cob -> {
cob.aload(0);
cob.invokespecial(CD_T1, INIT_NAME, MTD_void);
cob.return_();
});
clb.withMethodBody(METHOD_NAME, MTD_int, ACC_PUBLIC | ACC_STATIC, cob -> {
cob.bipush(2);
cob.ireturn();
});
});
}
public static byte[] dumpT3() {
return ClassFile.of().build(CD_T3, clb -> {
clb.withSuperclass(CD_T2);
clb.withFlags(AccessFlag.PUBLIC, AccessFlag.SUPER);
clb.withMethodBody(INIT_NAME, MTD_void, ACC_PUBLIC, cob -> {
cob.aload(0);
cob.invokespecial(CD_T2, INIT_NAME, MTD_void);
cob.return_();
});
clb.withMethodBody(METHOD_NAME, MTD_int, ACC_PUBLIC, cob -> {
cob.bipush(3);
cob.ireturn();
});
clb.withMethodBody("getMethodHandle", MethodTypeDesc.of(CD_MethodHandle),
ACC_PUBLIC | ACC_STATIC, cob -> {
cob.loadConstant(MethodHandleDesc.ofMethod(SPECIAL, CD_T1, METHOD_NAME, MTD_int));
cob.areturn();
});
clb.withMethodBody("getLookup", MTD_Lookup,
ACC_PUBLIC | ACC_STATIC, cob -> {
cob.invokestatic(CD_MethodHandles, "lookup", MTD_Lookup);
cob.areturn();
});
});
}
}