linux-kernel - Re: Out of tree module using LSM

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Message-ID: <20071129164746.GB9664@kroah.com>
Date:	Thu, 29 Nov 2007 08:47:46 -0800
From:	Greg KH <greg@...ah.com>
To:	Jon Masters <jonathan@...masters.org>
Cc:	Jan Engelhardt <jengelh@...putergmbh.de>, Valdis.Kletnieks@...edu,
	Christoph Hellwig <hch@...radead.org>,
	Al Viro <viro@....linux.org.uk>,
	Casey Schaufler <casey@...aufler-ca.com>,
	"Tvrtko A. Ursulin" <tvrtko.ursulin@...hos.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Out of tree module using LSM

On Thu, Nov 29, 2007 at 11:36:12AM -0500, Jon Masters wrote:
> On Wed, 2007-11-28 at 17:07 -0800, Greg KH wrote:
> 
> > The easiest way is as Al described above, just have the userspace
> > program that wrote the file to disk, check it then.
> 
> But the problem is that this isn't just Samba, this is a countless
> myriad of different applications. And if one of them doesn't support
> on-access scanning, then the whole solution isn't worth using.

Ok, which specific applications do they care about?  Last time I asked
it was still limited to a very small handful, all of which would be
trivial to add such a hook to.

> > There are some nice SAMBA plugins that do just that already out there...
> 
> That's really not the problem :-)

Yes it is.  That's all you want to catch, when a Windows machine wants
to access a file on a SAMBA server.  Do the check then, in userspace.

Believe me, I've been over and over and over and over this before...

thanks,

greg k-h
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