linux-kernel - Re: [PATCH v6 0/8] IMA: support for measuring kernel integrity critical data

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Message-ID: <20201122210031.GA26756@amd>
Date:   Sun, 22 Nov 2020 22:00:31 +0100
From:   Pavel Machek <pavel@....cz>
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, jmorris@...ei.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 0/8] IMA: support for measuring kernel integrity
 critical data

Hi!

> >How is it supposed to be useful?
> >
> >I'm pretty sure there are critical data that are not measured by
> >proposed module... and that are written under normal circumstances.
> >
> The goal of this series is to introduce the IMA hook
> measure_critical_data() and the necessary policies to use it; and
> illustrate that use with one example (SELinux). It is not scalable to
> identify and update all the critical data sources to use the proposed
> module at once.
> 
> A piecemeal approach to add more critical data measurement in subsequent
> patches would be easy to implement and review.

Basically every other data structure in kernel is "critical" by your
definition, and you can't really measure them all; some of them change
rather often. Going piecemeal does not really help here.

Example of critical data structure: page table entries for process I
own.

Best regards,
								Pavel
-- 
http://www.livejournal.com/~pavelmachek

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