r1 - 2008-01-22 - 03:21:26 - TWikiContributorYou are here: NTP >  TWiki Web > TWikiStoreQueryAlgorithmsBruteForceDotPm
NTP users are strongly urged to take immediate action to ensure that their NTP daemons are not susceptible to being used in distributed denial-of-service (DDoS) attacks. Please also take this opportunity to defeat denial-of-service attacks by implementing Ingress and Egress filtering through BCP38.

ntp-4.2.8p13 was released on 07 March 2019. It addresses 1 medium-severity security issue in ntpd, and provides 17 non-security bugfixes and 1 other improvements over 4.2.8p12.

Please see the NTP Security Notice for vulnerability and mitigation details.

Are you using Autokey in production? If so, please contact Harlan - he's got some questions for you.

Package TWiki::Store::QueryAlgorithms::BruteForce

Default brute-force query algorithm

Has some basic optimisation: it hoists regular expressions out of the query to use with grep, so we can narrow down the set of topics that we have to evaluate the query on.

Not sure exactly where the breakpoint is between the costs of hoisting and the advantages of hoisting. Benchmarks suggest that it's around 6 topics, though this may vary depending on disk speed and memory size. It also depends on the complexity of the query.

Edit | WYSIWYG | Attach | Printable | Raw View | Backlinks: Web, All Webs | History: r1 | More topic actions
 
This site is powered by the TWiki collaboration platformCopyright © by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding NTP? Send feedback
Note: Please contribute updates to this topic on TWiki.org at TWiki:TWiki.TWikiStoreQueryAlgorithmsBruteForceDotPm