linux-kernel - Re: [PATCH 0/5] VFS: DazukoFS, stackable-fs, file access control

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Message-ID: <20081226183019.GB1528@ucw.cz>
Date:	Fri, 26 Dec 2008 19:30:19 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	John Ogness <dazukocode@...ess.net>
Cc:	linux-kernel@...r.kernel.org, viro@...iv.linux.org.uk,
	malware-list@...ts.printk.net, eparis@...hat.com,
	hch@...radead.org, alan@...rguk.ukuu.org.uk
Subject: Re: [PATCH 0/5] VFS: DazukoFS, stackable-fs, file access control

On Wed 2008-12-24 13:11:29, John Ogness wrote:
> On 2008-12-24, Pavel Machek <pavel@...e.cz> wrote:
> >> If you are aware of a race condition in DazukoFS, please report
> >> it. Thank you.
> >
> > I'm surprised, do you claim there is none?
> 
> It depends on how you want to define "race condition". DazukoFS (in
> its current form) closes as many holes as default UNIX permissions or
> SElinux. However, changing permissions (i.e. scanning files) _after_
> two parties already have an open handle to the file is currently not
> covered. But this issue is not unique to DazukoFS (although as a
> stackable filesystem, DazukoFS could support this case as well).

Not unique to dazukofs, but regression to scanning at nfsd level,
right? So I guess it should be mentioned in changelog if you compare
yourself to solutions that do not have this problem.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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