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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/String/CompactString/NegativeSize.java Normal file
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/*
* Copyright (c) 2023, 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.
*/
import java.io.IOException;
import java.nio.charset.StandardCharsets;
/*
* @test
* @bug 8077559
* @summary Tests Compact String for negative size.
* @requires vm.bits == 64 & os.maxMemory >= 4G
* @run main/othervm -XX:+CompactStrings -Xmx4g NegativeSize
* @run main/othervm -XX:-CompactStrings -Xmx4g NegativeSize
*/
// In Java8: java.lang.OutOfMemoryError: Java heap space
// In Java9+: was java.lang.NegativeArraySizeException: -1894967266
public class NegativeSize {
static byte[] generateData() {
int asciisize = 1_200_000_000;
byte[] nonAscii = "非アスキー".getBytes();
int nonAsciiSize = nonAscii.length;
// 1 GB
byte[] arr = new byte[asciisize + nonAsciiSize];
for (int i=0; i<asciisize; ++i) {
arr[i] = (byte)('0' + (i % 40));
}
for(int i=0; i<nonAsciiSize; ++i) {
arr[i + asciisize] = nonAscii[i];
}
return arr;
}
public static void main(String[] args) throws IOException {
try {
byte[] largeBytes = generateData();
String inStr = new String(largeBytes, StandardCharsets.UTF_8);
System.out.println(inStr.length());
System.out.println(inStr.substring(1_200_000_000));
} catch (OutOfMemoryError ex) {
if (ex.getMessage().startsWith("UTF16 String size is")) {
System.out.println("Succeeded with OutOfMemoryError");
} else {
throw new RuntimeException("Failed: Not the OutOfMemoryError expected", ex);
}
} catch (NegativeArraySizeException ex) {
throw new RuntimeException("Failed: Expected OutOfMemoryError", ex);
}
}
}