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Re: Exploit for Linux wu.ftpd hole

daemon@ATHENA.MIT.EDU (Nathan Lawson)
Sun Jul 9 23:16:16 1995

Date:         Sun, 9 Jul 1995 15:56:35 -0700
Reply-To: Bugtraq List <BUGTRAQ@CRIMELAB.COM>
From: Nathan Lawson <nlawson@statler.csc.calpoly.edu>
X-To:         BUGTRAQ@CRIMELAB.COM
To: Multiple recipients of list BUGTRAQ <BUGTRAQ@CRIMELAB.COM>
In-Reply-To:  <Pine.LNX.3.91.950708140807.3259A-100000@phoenix.org> from "Mike
              Edulla" at Jul 8, 95 02:13:35 pm

> Yes, i've since discovered this. And the writes dont return a error. Hmm,
> how slow would fstat()ing the log file before writing be, it shouldnt be
> *too* bad.

The only problem I see here is that this should be done before writes, not
periodically.  If it was done every few minutes, it would cause a penalty
in swapping into memory, especially on machines with limited memory.  I'd like
to see more Unix daemons designed to wake up as little as possible.

-Nate

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