linux-kernel - TPM: hibernate with IMA PCR 10

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Message-ID: <deafaf6f-8e79-b193-68bf-3ab01bddd5c2@linux.ibm.com>
Date:   Mon, 29 Aug 2022 17:45:18 -0400
From:   Ken Goldman <kgold@...ux.ibm.com>
To:     Evan Green <evgreen@...omium.org>, linux-kernel@...r.kernel.org
Cc:     Matthew Garrett <mgarrett@...ora.tech>, dlunev@...gle.com,
        zohar@...ux.ibm.com, jejb@...ux.ibm.com,
        linux-integrity@...r.kernel.org, corbet@....net, rjw@...ysocki.net,
        gwendal@...omium.org, jarkko@...nel.org, linux-pm@...r.kernel.org,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: TPM: hibernate with IMA PCR 10

On 5/4/2022 7:20 PM, Evan Green wrote:
> Enabling the kernel to be able to do encryption and integrity checks on
> the hibernate image prevents a malicious userspace from escalating to
> kernel execution via hibernation resume.  [snip]

I have a related question.

When a TPM powers up from hibernation, PCR 10 is reset.  When a
hibernate image is restored:

1. Is there a design for how PCR 10 is restored?

2. How are /sys/kernel/security/ima/[pseudofiles] saved and
restored?


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