linux-kernel - Re: [PATCH v2] xattr: Enable security.capability in user namespaces

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Date:   Tue, 25 Jul 2017 22:00:07 -0500
From:   "Serge E. Hallyn" <serge@...lyn.com>
To:     Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Stefan Berger <stefanb@...ux.vnet.ibm.com>,
        Mimi Zohar <zohar@...ibm.com>, Theodore Ts'o <tytso@....edu>,
        containers@...ts.linux-foundation.org, lkp@...org,
        linux-kernel@...r.kernel.org, tycho@...ker.com,
        James.Bottomley@...senPartnership.com, vgoyal@...hat.com,
        christian.brauner@...lbox.org, amir73il@...il.com,
        linux-security-module@...r.kernel.org, casey@...aufler-ca.com
Subject: Re: [PATCH v2] xattr: Enable security.capability in user namespaces

On Fri, Jul 14, 2017 at 03:26:14PM -0400, Mimi Zohar wrote:
> On Fri, 2017-07-14 at 13:17 -0500, Eric W. Biederman wrote:
> > Which brings us to the semantic question of would it be nice to have
> > stacked IMA/EVM on the same file.
> > 
> > I really don't think we do.  I think allowing multiple keys for
> > different part of trusting files is easy enough that we should have no
> > need to fight over which keys do which.
> 
> We definitely want to support different policies on the native and in
> the namespace with different keys and keyrings.

Ok, so Stefan's code to support userspace in a container reading
security.ima and getting back the value for security.ima@...=1000
(if 1000 is the kuid of the container's root user) is in fact
useful to IMA?