linux-kernel - Re: [PATCH 01/11] Security: Add hook to get full maclabel xattr name

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Message-ID: <147227.75672.qm@web36609.mail.mud.yahoo.com>
Date:	Thu, 28 Feb 2008 18:07:53 -0800 (PST)
From:	Casey Schaufler <casey@...aufler-ca.com>
To:	Dave Quigley <dpquigl@...ho.nsa.gov>,
	Christoph Hellwig <hch@...radead.org>
Cc:	Stephen Smalley <sds@...ho.nsa.gov>, casey@...aufler-ca.com,
	viro@....linux.org.uk, trond.myklebust@....uio.no,
	bfields@...ldses.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	LSM List <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH 01/11] Security: Add hook to get full maclabel xattr name


--- Dave Quigley <dpquigl@...ho.nsa.gov> wrote:

> 
> On Thu, 2008-02-28 at 20:00 -0500, Christoph Hellwig wrote:
> > On Thu, Feb 28, 2008 at 07:32:47PM -0500, Dave Quigley wrote:
> > > I can always go with the original hook name of get_security_xattr_name
> > > which turns into a security_get_security_xattr_name call which seems a
> > > bit ludicrous. The only other complaint that I saw from Casey besides
> > > the name of the function was that there could be more than one xattr. If
> > > we want to address that then I need another hook that says give me all
> > > data that the LSM deems important for this file. Which is essentially
> > > the same thing as taking each of the xattr names that the module will
> > > provide, grabbing each of them in turn, and concatenating them together.
> > > For SELinux this is no different than getsecurity with the selinux
> > > suffix. The same goes for SMACK.
> > 
> > What about Casey's suggestion of get_security_blob?  For any reasonable
> > module that just has a single xattr it's trivial and for those that
> > have multiple or a different storage model it might get complicated
> > but that's not our problem for now.
> 
> If this is the method we are going to use then we need a corresponding
> set_security_blob as well.

Not to sound stupid, but why would you need this?

> This seems like a paradigm shift for
> accessing security information in the kernel.

Well, yes, but look at David Howell's file cacheing work
before you take too firm a stand.

> I said to Casey in the
> beginning that I'd be willing to revisit it but that neither he or I
> alone could make the decision. Unless I misunderstood the original
> mandate for security information and that it only applies to how user
> space accesses it.

Sorry, I don't understand how user space and mandates go together here.


Casey Schaufler
casey@...aufler-ca.com
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