linux-kernel - Re: [PATCH v3] selinux: measure state and policy capabilities

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Message-ID: <CAHC9VhT4pnsFTL3N8pZgrgpqzgCU+Odd4V=SGvTA9QcKAGwasw@mail.gmail.com>
Date:   Thu, 4 Mar 2021 20:45:41 -0500
From:   Paul Moore <paul@...l-moore.com>
To:     Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
Cc:     zohar@...ux.ibm.com,
        Stephen Smalley <stephen.smalley.work@...il.com>,
        tusharsu@...ux.microsoft.com, tyhicks@...ux.microsoft.com,
        casey@...aufler-ca.com, agk@...hat.com, snitzer@...hat.com,
        gmazyland@...il.com, sashal@...nel.org,
        James Morris <jmorris@...ei.org>,
        linux-integrity@...r.kernel.org, selinux@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] selinux: measure state and policy capabilities

On Thu, Mar 4, 2021 at 2:20 PM Lakshmi Ramasubramanian
<nramas@...ux.microsoft.com> wrote:
> On 2/12/21 8:37 AM, Lakshmi Ramasubramanian wrote:
>
> Hi Paul,
>
> > SELinux stores the configuration state and the policy capabilities
> > in kernel memory.  Changes to this data at runtime would have an impact
> > on the security guarantees provided by SELinux.  Measuring this data
> > through IMA subsystem provides a tamper-resistant way for
> > an attestation service to remotely validate it at runtime.
> >
> > Measure the configuration state and policy capabilities by calling
> > the IMA hook ima_measure_critical_data().
> >
>
> I have addressed your comments on the v2 patch for selinux measurement
> using IMA. Could you please let me know if there are any other comments
> that I need to address in this patch?

The merge window just closed earlier this week, and there were a
handful of bugs that needed to be addressed before I could look at
this patch.  If I don't get a chance to review this patch tonight, I
will try to get to it this weekend or early next week.

-- 
paul moore
www.paul-moore.com