Subject: Re: Out of tree module using LSM
From: Jon Masters <jonathan@jonmasters.org>
To: Greg KH <greg@kroah.com>
Cc: Jan Engelhardt <jengelh@computergmbh.de>, Valdis.Kletnieks@vt.edu,
       Christoph Hellwig <hch@infradead.org>, Al Viro <viro@ftp.linux.org.uk>,
       Casey Schaufler <casey@schaufler-ca.com>,
       "Tvrtko A. Ursulin" <tvrtko.ursulin@sophos.com>,
       linux-kernel@vger.kernel.org
In-Reply-To: <20071129164746.GB9664@kroah.com>
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	 <20071128183040.GW8181@ftp.linux.org.uk> <20071129003840.GA22530@kroah.com>
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Organization: World Organi[sz]ation Of Broken Dreams
Date: Thu, 29 Nov 2007 12:05:36 -0500
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On Thu, 2007-11-29 at 08:47 -0800, Greg KH wrote:
> 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.

Like I said, I'm trying to put together a set of "feature requirements"
that we can publish to LKML and get feedback. I am lead to believe that
they basically want to trap every file operation, of every potential
userspace program, so I don't think it's a handful at this point.

> > > 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.

Oh, I meant that if it was just Samba we'd all be home and dry by now.

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

Yeah. I know, I'm trying not to flog a dead horse here, but I think
there's real genuine interest here this time around. So, maybe I'm just
trying because everyone else already did, but it's worth a shot :-)

Jon.


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