linux-kernel - Re: Use of inode for storing security info

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Message-ID: <38386.1316821625@turing-police.cc.vt.edu>
Date:	Fri, 23 Sep 2011 19:47:05 -0400
From:	Valdis.Kletnieks@...edu
To:	Parag Amritkar <paragamritkar@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Use of inode for storing security info

On Fri, 23 Sep 2011 23:48:36 +0530, Parag Amritkar said:
> Can we use any field of inode for storing information like storing
> encryption key of that file?

You probably want to look at how the various security LSMs use
the "security.*" extended attribute namespace to store labels and
similar information.

Protip: You don't want to store the encryption key of the file there.
That's basically leaving the key under the doormat - and a sign saying
"look under doormat for key".

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