linux-kernel - Re: [PATCH v6 8/8] selinux: measure state and hash of the policy using IMA

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Message-ID: <alpine.LRH.2.21.2011211301340.18334@namei.org>
Date:   Sat, 21 Nov 2020 13:05:23 +1100 (AEDT)
From:   James Morris <jmorris@...ei.org>
To:     Tushar Sugandhi <tusharsu@...ux.microsoft.com>
cc:     zohar@...ux.ibm.com, stephen.smalley.work@...il.com,
        casey@...aufler-ca.com, agk@...hat.com, snitzer@...hat.com,
        gmazyland@...il.com, paul@...l-moore.com,
        tyhicks@...ux.microsoft.com, sashal@...nel.org,
        nramas@...ux.microsoft.com, linux-integrity@...r.kernel.org,
        selinux@...r.kernel.org, linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, dm-devel@...hat.com
Subject: Re: [PATCH v6 8/8] selinux: measure state and hash of the policy
 using IMA

On Thu, 19 Nov 2020, Tushar Sugandhi wrote:

> an impact on the security guarantees provided by SELinux. Measuring
> such in-memory data structures through IMA subsystem provides a secure
> way for a remote attestation service to know the state of the system
> and also the runtime changes in the state of the system.

I think we need better clarity on the security model here than just "a 
secure way...".  Secure how and against what threats?

This looks to me like configuration assurance, i.e. you just want to know 
that systems have been configured correctly, not to detect a competent 
attack. Is that correct?



-- 
James Morris
<jmorris@...ei.org>