linux-kernel - Re: [PATCHv2 1/5] VFS: DazukoFS, stackable-fs, file access control

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Message-ID: <20090213194812.GM28946@ZenIV.linux.org.uk>
Date:	Fri, 13 Feb 2009 19:48:12 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	John Ogness <dazukocode@...ess.net>
Cc:	Jan Engelhardt <jengelh@...ozas.de>, linux-kernel@...r.kernel.org,
	malware-list@...ts.printk.net, eparis@...hat.com,
	hch@...radead.org, alan@...rguk.ukuu.org.uk
Subject: Re: [PATCHv2 1/5] VFS: DazukoFS, stackable-fs, file access control

On Fri, Feb 13, 2009 at 08:31:03PM +0100, John Ogness wrote:

> If we want to forbid users from being able to do this, I think it
> would be simpler just to fail the mount if it is _not_ specified for
> direct stacking. This forces users to use a syntax that makes it very
> clear what they are doing.
> 
> Since mounting to a different directory could cause problems, I think
> it will be good to forbid it. I will make this change for the next
> patch series.

And just how are you going to do that?  Note that underlying directory
may be visible in many places to start with...
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