linux-kernel - Re: [RFC] cgroups: implement device whitelist lsm (v2)

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Date:	Fri, 14 Mar 2008 09:42:09 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Paul Menage <menage@...gle.com>
Cc:	"Serge E. Hallyn" <serue@...ibm.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	James Morris <jmorris@...ei.org>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-security-module@...r.kernel.org, Greg KH <greg@...ah.com>,
	Stephen Smalley <sds@...ch.ncsc.mil>,
	Casey Schaufler <casey@...aufler-ca.com>
Subject: Re: [RFC] cgroups: implement device whitelist lsm (v2)

Quoting Paul Menage (menage@...gle.com):
> On Fri, Mar 14, 2008 at 6:58 AM, Serge E. Hallyn <serue@...ibm.com> wrote:
> >  James and Stephen agree with your LSM qualms.  I suppose we could add
> >  cgroups next to the lsm hooks.  I suspect Paul Menage would complain
> >  about that (Paul?),
> 
> Depends on what you mean by "add cgroups to the LSM hooks". Could you
> expand on that?

cgroup hooks next to the lsm hooks.  So in fs/namei.c where there are
security_inode_permission() hooks, there would also be
cgroup_inode_permission() hooks to let the devices cgroup mediate the
access.  Well, in permission(), probably not in exec_permission_lite()
since that's probalby not a device access  :)

So far it looks like everyone likes that, so as long as you don't nack I
guess that'll be the way to go.

thanks,
-serge
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