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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/sun/security/krb5/MicroTime.java Normal file
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/*
* Copyright (c) 2010, 2025, 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 6882687 8011124
* @summary KerberosTime too imprecise
* @modules java.security.jgss/sun.security.krb5.internal
*/
import sun.security.krb5.internal.KerberosTime;
public class MicroTime {
public static void main(String[] args) throws Exception {
// We count how many different KerberosTime values
// can be acquired within one second.
KerberosTime t1 = KerberosTime.now();
KerberosTime last = t1;
int count = 0;
while (true) {
KerberosTime t2 = KerberosTime.now();
if (t2.getTime() - t1.getTime() > 1000) break;
if (!last.equals(t2)) {
last = t2;
count++;
}
}
// Before JDK-6882687, KerberosTime was measured in milliseconds.
// Now it's in microseconds. We should be able to record more than
// 1000 distinct KerberosTime values within one second.
if (count < 1001) {
throw new Exception("What? only " + (1000000/count) +
" musec precision?");
}
}
}