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Re: untrusted translators


From: Neal H. Walfield
Subject: Re: untrusted translators
Date: Mon, 21 Mar 2005 09:31:36 +0000
User-agent: Wanderlust/2.10.1 (Watching The Wheels) SEMI/1.14.6 (Maruoka) FLIM/1.14.6 (Marutamachi) APEL/10.6 Emacs/21.3 (i386-pc-linux-gnu) MULE/5.0 (SAKAKI)

At 20 Mar 2005 20:15:03 -0800,
Thomas Bushnell BSG wrote:
> 
> Marcus Brinkmann <address@hidden> writes:
> 
> > Following untrusted translators in the filesystem is a real security
> > hazard.
> 
> Can you say more about a specific losing scenario?  I did my level
> best to make sure that following translators doesn't give away any
> privs.  What's the problem?

A simple example of problem is a translator with an infinite file
hierarchy.  That can be done in the file system using finite space:
the root directory contains a directory, DIR, with inode #3, which
contains a directory, DIR, with inode #4, which contains a directory,
DIR with inode #5, etc.  Any process trying to list this part of the
VFS will end up in an infinite loop.  This would affect the program
which updates the locate database, users who run `find /', etc.




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