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

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Date:   Thu, 13 Jul 2017 19:38:30 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Stefan Berger <stefanb@...ux.vnet.ibm.com>
Cc:     "Theodore Ts'o" <tytso@....edu>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        containers@...ts.linux-foundation.org, lkp@...org,
        linux-kernel@...r.kernel.org, zohar@...ux.vnet.ibm.com,
        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

Stefan Berger <stefanb@...ux.vnet.ibm.com> writes:

> On 07/13/2017 01:49 PM, Eric W. Biederman wrote:
>
> > My big question right now is can you implement Ted's suggested
> > restriction.  Only one security.foo or secuirty.foo@... attribute ?

> We need to raw-list the xattrs and do the check before writing them. I am fairly sure this can be done.
>
> So now you want to allow security.foo and one security.foo@...=<> or just a single one security.foo(@[[:print:]]*)?
>

The latter.

Eric