[ntp:security] memory leak

Danny Mayer mayer at ntp.isc.org
Mon Dec 17 17:24:38 UTC 2007

kevin.mcgrath at no.abb.com wrote:
> Hi
> We are running NTP on Windows XP Pro SP2.
> When flooding the NTP service the ntpd process' private bytes usage
> grows continuously. At some point the service will reach its allocated
> buffer limit and probably crash. Prior to starting flooding the ntpd
> process' private bytes usage is at 921k but once flooding commences
> after a short time interval of 100 seconds the private bytes performance
> counter is 50 MB. These results apply to both the stable and development
> codebase. The tested stable version is 4.2.4p4 at 1.1520-modena-o
> (Meinberg) and the development version is 4.2.5p106.
> The flooding test tool used is the "IP Stack Integrity Checker" (ISIC)
> suite at full speed. The purpose of these tests is to understand the
> impact on the NTP stack to flooding. The ISIC suite is an open source
> tool, which runs on Linux and is available from
> http://isic.sourceforge.net. The ISIC version in use is v0.07. The
> following ISIC syntax can be used to reproduce the above scenario:
> *udpsic -i ethX -r 1 -s rand -d <ip_addr>,123 -F0 -V0 -I0 -p10000000, *
> where X is the Ethernet interface number and /123/ is the NTP port number.

Can you send us details of the error that you are seeing? I will try and
reproduce this one some of our systems.


> Kind Regards
> Geir & Kevin
> ------------------------------------------------------------------------
> _______________________________________________
> security mailing list
> security at lists.ntp.org
> https://lists.ntp.org/mailman/listinfo/security

More information about the security mailing list