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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/VirtualAllocCommitUncommitRecommit.java Normal file
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/*
* Copyright (c) 2014, 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.
*/
/*
* @test
* @summary Test reserve/commit/uncommit/release of virtual memory and that we track it correctly
* @library /test/lib
* @modules java.base/jdk.internal.misc
* java.management
* @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 VirtualAllocCommitUncommitRecommit
*
*/
import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.whitebox.WhiteBox;
public class VirtualAllocCommitUncommitRecommit {
public static WhiteBox wb = WhiteBox.getWhiteBox();
public static void main(String args[]) throws Exception {
OutputAnalyzer output;
long commitSize = 128 * 1024; // 128KB
long reserveSize = 4 * 1024 * 1024; // 4096KB
long addr;
// reserve
addr = wb.NMTReserveMemory(reserveSize);
output = NMTTestUtils.startJcmdVMNativeMemoryDetail();
checkReservedCommittedSummary(output, 4096, 0);
output.shouldMatch("\\[0x[0]*" + Long.toHexString(addr) + " - 0x[0]*"
+ Long.toHexString(addr + reserveSize)
+ "\\] reserved 4096KB for Test");
long addrA = addr;
long addrB = addr + commitSize;
long addrC = addr + (2 * commitSize);
long addrD = addr + (3 * commitSize);
long addrE = addr + (4 * commitSize);
long addrF = addr + (5 * commitSize);
// commit ABCD
wb.NMTCommitMemory(addrA, commitSize);
wb.NMTCommitMemory(addrB, commitSize);
wb.NMTCommitMemory(addrC, commitSize);
wb.NMTCommitMemory(addrD, commitSize);
output = NMTTestUtils.startJcmdVMNativeMemoryDetail();
checkReservedCommittedSummary(output, 4096, 512);
output.shouldMatch("\\[0x[0]*" + Long.toHexString(addr) + " - 0x[0]*"
+ Long.toHexString(addr + reserveSize)
+ "\\] reserved 4096KB for Test");
// uncommit BC
wb.NMTUncommitMemory(addrB, commitSize);
wb.NMTUncommitMemory(addrC, commitSize);
output = NMTTestUtils.startJcmdVMNativeMemoryDetail();
checkReservedCommittedSummary(output, 4096, 256);
output.shouldMatch("\\[0x[0]*" + Long.toHexString(addr) + " - 0x[0]*"
+ Long.toHexString(addr + reserveSize)
+ "\\] reserved 4096KB for Test");
// commit EF
wb.NMTCommitMemory(addrE, commitSize);
wb.NMTCommitMemory(addrF, commitSize);
output = NMTTestUtils.startJcmdVMNativeMemoryDetail();
checkReservedCommittedSummary(output, 4096, 512);
output.shouldMatch("\\[0x[0]*" + Long.toHexString(addr) + " - 0x[0]*"
+ Long.toHexString(addr + reserveSize)
+ "\\] reserved 4096KB for Test");
// uncommit A
wb.NMTUncommitMemory(addrA, commitSize);
output = NMTTestUtils.startJcmdVMNativeMemoryDetail();
checkReservedCommittedSummary(output, 4096, 384);
output.shouldMatch("\\[0x[0]*" + Long.toHexString(addr) + " - 0x[0]*"
+ Long.toHexString(addr + reserveSize)
+ "\\] reserved 4096KB for Test");
// commit ABC
wb.NMTCommitMemory(addrA, commitSize);
wb.NMTCommitMemory(addrB, commitSize);
wb.NMTCommitMemory(addrC, commitSize);
output = NMTTestUtils.startJcmdVMNativeMemoryDetail();
checkReservedCommittedSummary(output, 4096, 768);
output.shouldMatch("\\[0x[0]*" + Long.toHexString(addr) + " - 0x[0]*"
+ Long.toHexString(addr + reserveSize)
+ "\\] reserved 4096KB for Test");
// uncommit ABCDEF
wb.NMTUncommitMemory(addrA, commitSize);
wb.NMTUncommitMemory(addrB, commitSize);
wb.NMTUncommitMemory(addrC, commitSize);
wb.NMTUncommitMemory(addrD, commitSize);
wb.NMTUncommitMemory(addrE, commitSize);
wb.NMTUncommitMemory(addrF, commitSize);
output = NMTTestUtils.startJcmdVMNativeMemoryDetail();
checkReservedCommittedSummary(output, 4096, 0);
output.shouldMatch("\\[0x[0]*" + Long.toHexString(addr) + " - 0x[0]*"
+ Long.toHexString(addr + reserveSize)
+ "\\] reserved 4096KB for Test");
// release
wb.NMTReleaseMemory(addr, reserveSize);
output = NMTTestUtils.startJcmdVMNativeMemoryDetail();
checkReservedCommittedSummary(output, 0, 0);
output.shouldNotMatch("\\[0x[0]*" + Long.toHexString(addr) + " - 0x[0]*"
+ Long.toHexString(addr + reserveSize) + "\\] reserved 4096KB for Test");
}
// running peak counter
static long peakKB = 0;
public static void checkReservedCommittedSummary(OutputAnalyzer output, long reservedKB, long committedKB) {
if (committedKB > peakKB) {
peakKB = committedKB;
}
NMTTestUtils.checkReservedCommittedSummary(output, reservedKB, committedKB, peakKB);
}
}