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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/awt/Graphics2D/DrawString/DrawStringCrash.java Normal file
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/*
* Copyright (c) 2014, 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 8043508 8080084
* @summary Drawing a very long string crashes VM
* @run main/othervm DrawStringCrash
*/
import java.awt.*;
import java.awt.image.*;
public class DrawStringCrash {
public static void main(String[] args) {
StringBuffer sb = new StringBuffer();
String s = "abcdefghijklmnopqrstuzwxyz";
for (int x = 0; x < 100000 ; x++) {
sb.append(s);
}
// Now have a string which uses approx 5Mb memory
// Loop again drawing doubling each time until
// we reach 8 billion chars or get OOME which means we can't
// go any further.
// Often there is no crash because Java OOM happens
// long before native heap runs out.
long maxLen = 8L * 1024 * 1024 * 1024;
int len = sb.length();
BufferedImage bi =
new BufferedImage(100, 100, BufferedImage.TYPE_INT_RGB);
Graphics2D g2d = bi.createGraphics();
while (len < maxLen) {
try {
g2d.drawString(sb.toString(), 20, 20);
sb.append(sb);
len *= 2;
} catch (OutOfMemoryError e) {
return;
}
}
return;
}
}