Path: utzoo!attcan!uunet!mcvax!hp4nl!uva!betty!dik
From: dik@uva.UUCP (Casper H.S. Dik)
Newsgroups: comp.unix.questions
Subject: Re: File Write Permission Rules
Keywords: file write permission rules
Message-ID: <632@uva.UUCP>
Date: 10 Feb 89 21:36:04 GMT
References: <306@wubios.wustl.edu> <249@ibd.BRL.MIL> <1995@lindy.Stanford.EDU>
Sender: news@uva.UUCP
Reply-To: dik@uva.UUCP (Casper H.S. Dik)
Organization: Faculteit Wiskunde & Informatica, Universiteit van Amsterdam
Lines: 18

In article <1995@lindy.Stanford.EDU> eirik@lurch.Stanford.EDU (Eirik Fuller) writes:
>All this chatter about how somone else can remove my file even if I'm
>the only one who can write to it got me thinking, and the solution is
>obvious.  ....


If you have 4.3BSD, SunOS 4.x etc the solution is even more obvious:
Set the sticky bit on your directory. This prevents people other than
the owner of the file or the owner of the directory in which the link
resides to unlink or rename the link.

E.g.: 'chmod +t' /tmp prevents nasty people from doing 'chdir /tmp ; rm -f *'

--cd
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Casper H.S. Dik
University of Amsterdam     |		      dik@uva.uucp
The Netherlands             |                 ...!uunet!mcvax!uva!dik