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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/hotspot/jtreg/runtime/NMT/MallocSiteHashOverflow.java Normal file
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/*
* Copyright (c) 2014, 2022, 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
* @summary Test corner case that overflows malloc site hashtable bucket
* @requires sun.arch.data.model == "32"
* @key stress
* @modules java.base/jdk.internal.misc
* @library /test/lib
* @build jdk.test.whitebox.WhiteBox
* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:NativeMemoryTracking=detail MallocSiteHashOverflow
*/
import jdk.test.lib.JDKToolFinder;
import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.whitebox.WhiteBox;
public class MallocSiteHashOverflow {
public static void main(String args[]) throws Exception {
// Size of entries based on malloc tracking header defined in mallocTracker.hpp
// For 32-bit systems, create 257 malloc sites with the same hash bucket to overflow a hash bucket
long entries = 257;
OutputAnalyzer output;
WhiteBox wb = WhiteBox.getWhiteBox();
int MAX_HASH_SIZE = wb.NMTGetHashSize();
// Grab my own PID
String pid = Long.toString(ProcessTools.getProcessId());
ProcessBuilder pb = new ProcessBuilder();
// Verify that current tracking level is "detail"
pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "statistics"});
output = new OutputAnalyzer(pb.start());
output.shouldContain("Native Memory Tracking Statistics");
// Attempt to cause NMT to downgrade tracking level by allocating small amounts
// of memory with random pseudo call stack
int pc = 1;
for (int i = 0; i < entries; i++) {
long addr = wb.NMTMallocWithPseudoStack(1, pc);
if (addr == 0) {
throw new RuntimeException("NMTMallocWithPseudoStack: out of memory");
}
// We free memory here since it doesn't affect pseudo malloc alloc site hash table entries
wb.NMTFree(addr);
pc += MAX_HASH_SIZE;
if (i == entries) {
// Verify that tracking has been downgraded
pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "statistics"});
output = new OutputAnalyzer(pb.start());
output.shouldContain("Tracking level has been downgraded due to lack of resources");
}
}
}
}