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

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Message-ID: <20080314014121.GA8320@sergelap.austin.ibm.com>
Date:	Thu, 13 Mar 2008 20:41:21 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	James Morris <jmorris@...ei.org>
Cc:	"Serge E. Hallyn" <serue@...ibm.com>,
	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>,
	Pavel Emelianov <xemul@...nvz.org>
Subject: Re: [RFC] cgroups: implement device whitelist lsm (v2)

Quoting James Morris (jmorris@...ei.org):
> On Thu, 13 Mar 2008, Serge E. Hallyn wrote:
> 
> > Quoting James Morris (jmorris@...ei.org):
> > > On Thu, 13 Mar 2008, Serge E. Hallyn wrote:
> > > 
> > > > True, but while this change simplifies the code a bit, the semantics
> > > > seem more muddled - devcg will be enforcing when CONFIG_CGROUP_DEV=y
> > > > and:
> > > > 
> > > > 	SECURITY=n or
> > > > 	rootplug is enabled
> > > > 	capabilities is enabled
> > > > 	smack is enabled
> > > > 	selinux+capabilities is enabled
> > > 
> > > Well, this is how real systems are going to be deployed.
> > 
> > Sorry, do you mean with capabilities?
> 
> Yes.
> 
> All Fedora, RHEL, CentOS etc. ship with SELinux+capabilities.  I can't 
> imagine not enabling them on other kernels.
> 
> > > It becomes confusing, IMHO, if you have to change which secondary LSM you 
> > > stack with SELinux to enable a cgroup feature.
> > 
> > So you're saying selinux without capabilities should still be able to
> > use dev_cgroup?  (Just making sure I understand right)
> 
> Nope, SELinux always stacks with capabilities, so havng the cgroup hooks 
> in capabilities makes sense (rather than having us change the secondary 
> stacking LSM just to enable a feature).

Oh, ok.

Will let the patch stand until Pavel and Greg comment then.

thanks,
-serge
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