bugtraq - Re: /proc filesystem allows bypassing directory permissions on Linux

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Message-Id: <200910271256.n9RCu1Rf009098@bari.maths.usyd.edu.au>
Date: Tue, 27 Oct 2009 23:56:01 +1100
From: psz@...hs.usyd.edu.au
To: marco@....nl
Cc: bugtraq@...urityfocus.com, Casper.Dik@....com,
	dan@...htwave.net.ru, matt.bergin@...mail.com, pavel@....cz
Subject: Re: /proc filesystem allows bypassing directory permissions on Linux

Marco Verschuur <marco@....nl> wrote:

> And due to the actual file permissions the read-only fd can easily  
> changed to read-write.

How would you do that? Cannot use fcntl() as that would not let you.

Cheers, Paul

Paul Szabo   psz@...hs.usyd.edu.au   http://www.maths.usyd.edu.au/u/psz/
School of Mathematics and Statistics   University of Sydney    Australia