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

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Date:	Thu, 29 Nov 2007 12:05:36 -0500
From:	Jon Masters <jonathan@...masters.org>
To:	Greg KH <greg@...ah.com>
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, 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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