linux-kernel - Re: [RFC PATCH v3 1/3] ima: extend clone() with IMA namespace support

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Date:   Wed, 18 Apr 2018 15:57:52 -0400
From:   Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:     John Johansen <john.johansen@...onical.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Stefan Berger <stefanb@...ux.vnet.ibm.com>
Cc:     linux-integrity@...r.kernel.org,
        containers@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org, tycho@...ker.com,
        serge@...lyn.com, sunyuqiong1988@...il.com, david.safford@...com,
        mkayaalp@...binghamton.edu, James.Bottomley@...senPartnership.com,
        Yuqiong Sun <suny@...ibm.com>,
        Mehmet Kayaalp <mkayaalp@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH v3 1/3] ima: extend clone() with IMA namespace
 support

On Wed, 2018-04-18 at 09:09 -0700, John Johansen wrote:
> On 04/13/2018 09:25 AM, Mimi Zohar wrote:
> > [Cc'ing John Johansen]
> > 
> > On Tue, 2018-03-27 at 18:01 -0500, Eric W. Biederman wrote:
> > [...]
> >> As such I expect the best way to create the ima namespace is by simply
> >> writing to securityfs/imafs.  Possibly before the user namespace is
> >> even unshared.  That would allow IMA to keep track of things from
> >> before a container is created.
> > 
> 
> I do think this is generally the right approach for LSMs when looking
> forward to LSM stacking and more LSMs.
> 
> 
> > My initial thought was to stage IMA namespacing with just IMA-audit
> > first, followed by either IMA-measurement or IMA-appraisal.  This
> > would allow us to get the basic IMA namespacing framework working and
> > defer dealing with the securityfs related namespacing of the IMA
> > policy and measurement list issues to later.
> > 
> > By tying IMA namespacing to a securityfs ima/unshare file, we would
> > need to address the securityfs issues first.
> > 
> 
> well it depends on what you want to do. It would be possible to have
> a simple file (not a jump link) within securityfs that IMA could use
> without having to deal with all the securityfs issues first. However it
> does require that securityfs (not necessarily imafs) be visible within
> the mount namespace of the task doing the setup.

Eric, would you be OK with that?

Mimi