linux-kernel - Re: [RFC PATCH v9 05/16] ipe: add userspace interface

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Date:   Thu, 13 Apr 2023 14:45:07 -0400
From:   Paul Moore <paul@...l-moore.com>
To:     Fan Wu <wufan@...ux.microsoft.com>
Cc:     corbet@....net, zohar@...ux.ibm.com, jmorris@...ei.org,
        serge@...lyn.com, tytso@....edu, ebiggers@...nel.org,
        axboe@...nel.dk, agk@...hat.com, snitzer@...nel.org,
        eparis@...hat.com, linux-doc@...r.kernel.org,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-fscrypt@...r.kernel.org, linux-block@...r.kernel.org,
        dm-devel@...hat.com, linux-audit@...hat.com,
        roberto.sassu@...wei.com, linux-kernel@...r.kernel.org,
        Deven Bowers <deven.desai@...ux.microsoft.com>
Subject: Re: [RFC PATCH v9 05/16] ipe: add userspace interface

On Wed, Apr 12, 2023 at 7:36 PM Fan Wu <wufan@...ux.microsoft.com> wrote:
> On Tue, Apr 11, 2023 at 05:45:41PM -0400, Paul Moore wrote:
> > On Mon, Apr 10, 2023 at 3:10???PM Fan Wu <wufan@...ux.microsoft.com> wrote:
> > > On Thu, Mar 02, 2023 at 02:04:42PM -0500, Paul Moore wrote:
> > > > On Mon, Jan 30, 2023 at 5:58???PM Fan Wu <wufan@...ux.microsoft.com> wrote:

...

> > I guess this does make me wonder about keeping a non-active policy
> > loaded in the kernel, what purpose does that serve?
> >
>
> The non-active policy doesn't serve anything unless it is activated. User can
> even delete a policy if that is no longer needed. Non-active is just the default
> state when a new policy is loaded.
>
> If IPE supports namespace, there is another use case where different containers
> can select different policies as the active policy from among multiple loaded
> policies. Deven has presented a demo of this during LSS 2021. But this goes
> beyond the scope of this version.

Do you plan to add namespace support at some point in the
not-too-distant future?  If so, I'm okay with keeping support for
multiple policies, but if you think you're only going to support one
active policy at a time, it might be better to remove support for
multiple (inactive) policies.

-- 
paul-moore.com