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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/condy/CondyWithGarbageTest.java Normal file
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/*
* Copyright (c) 2017, 2026, 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 8186046
* @summary Stress test ldc to ensure HotSpot correctly manages oop maps
* @library /java/lang/invoke/common
* @build test.java.lang.invoke.lib.InstructionHelper
* @run junit CondyWithGarbageTest
* @run junit/othervm -XX:+UnlockDiagnosticVMOptions -XX:UseBootstrapCallInfo=3 CondyWithGarbageTest
*/
import java.lang.classfile.ClassFile;
import java.lang.classfile.CodeBuilder;
import java.lang.constant.*;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import static java.lang.invoke.MethodType.methodType;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static test.java.lang.invoke.lib.InstructionHelper.classDesc;
public class CondyWithGarbageTest {
static final MethodHandles.Lookup L = MethodHandles.lookup();
@Test
public void testString() throws Throwable {
MethodHandle mh = lcdStringBasher();
int l = 0;
for (int i = 0; i < 100000; i++) {
l += +((String) mh.invoke()).length();
}
assertTrue(l > 0);
}
public static Object bsmString(MethodHandles.Lookup l,
String constantName,
Class<?> constantType) {
return new StringBuilder(constantName).toString();
}
static MethodHandle lcdStringBasher() throws Exception {
ClassDesc cd = classDesc(L.lookupClass(), "$Code$String");
byte[] bytes = ClassFile.of().build(cd, classBuilder -> classBuilder
.withVersion(55, 0)
.withSuperclass(ConstantDescs.CD_Object)
.withMethod(ConstantDescs.INIT_NAME, ConstantDescs.MTD_void, ClassFile.ACC_PUBLIC,
methodBuilder -> methodBuilder
.withCode(codeBuilder -> codeBuilder
.aload(0)
.invokespecial(ConstantDescs.CD_Object, ConstantDescs.INIT_NAME,
ConstantDescs.MTD_void, false)
.return_()))
.withMethod("m", MethodTypeDesc.of(ConstantDescs.CD_String),
ClassFile.ACC_PUBLIC + ClassFile.ACC_STATIC, methodBuilder -> methodBuilder
.withCode(codeBuilder -> {
codeBuilder
.new_(classDesc(StringBuilder.class))
.dup()
.invokespecial(classDesc(StringBuilder.class), ConstantDescs.INIT_NAME,
ConstantDescs.MTD_void, false)
.astore(0);
for (int i = 10; i < 100; i++) {
ldcString(codeBuilder, Integer.toString(i));
codeBuilder
.astore(1)
.aload(0)
.aload(1)
.invokevirtual(
classDesc(StringBuilder.class),
"append",
MethodTypeDesc.of(
classDesc(StringBuilder.class),
classDesc(String.class)))
.pop();
}
codeBuilder
.aload(0)
.invokevirtual(
classDesc(StringBuilder.class),
"toString",
MethodTypeDesc.of(classDesc(String.class)))
.areturn();
}
)));
Class<?> gc = L.defineClass(bytes);
return L.findStatic(gc, "m", methodType(String.class));
}
private static void ldcString(CodeBuilder codeBuilder, String name) {
codeBuilder.ldc(DynamicConstantDesc.ofNamed(
MethodHandleDesc.of(
DirectMethodHandleDesc.Kind.STATIC,
classDesc(L.lookupClass()),
"bsmString",
methodType(Object.class, MethodHandles.Lookup.class, String.class, Class.class).toMethodDescriptorString()),
name,
classDesc(String.class)
));
}
@Test
public void testStringArray() throws Throwable {
MethodHandle mh = lcdStringArrayBasher();
int l = 0;
for (int i = 0; i < 100000; i++) {
l += +((String) mh.invoke()).length();
}
assertTrue(l > 0);
}
public static Object bsmStringArray(MethodHandles.Lookup l,
String constantName,
Class<?> constantType) {
return new String[]{new StringBuilder(constantName).toString()};
}
static MethodHandle lcdStringArrayBasher() throws Exception {
ClassDesc cd = classDesc(L.lookupClass(), "$Code$StringArray");
byte[] bytes = ClassFile.of().build(cd, classBuilder -> classBuilder
.withVersion(55, 0)
.withSuperclass(ConstantDescs.CD_Object)
.withMethod(ConstantDescs.INIT_NAME, ConstantDescs.MTD_void, ClassFile.ACC_PUBLIC,
methodBuilder -> methodBuilder
.withCode(codeBuilder -> codeBuilder
.aload(0)
.invokespecial(ConstantDescs.CD_Object, ConstantDescs.INIT_NAME,
ConstantDescs.MTD_void, false)
.return_()))
.withMethod("m", MethodTypeDesc.of(classDesc(String.class)),
ClassFile.ACC_PUBLIC + ClassFile.ACC_STATIC, methodBuilder -> methodBuilder
.withCode(codeBuilder -> {
codeBuilder
.new_(classDesc(StringBuilder.class))
.dup()
.invokespecial(classDesc(StringBuilder.class),
ConstantDescs.INIT_NAME, ConstantDescs.MTD_void, false)
.astore(0);
for (int i = 10; i < 100; i++) {
ldcStringArray(codeBuilder, Integer.toString(i));
codeBuilder
.bipush(0)
.aaload()
.astore(1)
.aload(0)
.aload(1)
.invokevirtual(
classDesc(StringBuilder.class),
"append",
MethodTypeDesc.of(
classDesc(StringBuilder.class),
classDesc(String.class)))
.pop();
}
codeBuilder
.aload(0)
.invokevirtual(
classDesc(StringBuilder.class),
"toString",
MethodTypeDesc.of(classDesc(String.class)))
.areturn();
}
)));
Class<?> gc = L.defineClass(bytes);
return L.findStatic(gc, "m", methodType(String.class));
}
static void ldcStringArray(CodeBuilder codeBuilder, String name) {
codeBuilder.ldc(DynamicConstantDesc.ofNamed(
MethodHandleDesc.of(
DirectMethodHandleDesc.Kind.STATIC,
classDesc(L.lookupClass()),
"bsmStringArray",
methodType(Object.class, MethodHandles.Lookup.class, String.class, Class.class).toMethodDescriptorString()
),
name,
classDesc(String[].class)
));
}
}