linux-kernel - Re: [PATCH] IMA: Handle early boot data measurement

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Date:   Tue, 25 Aug 2020 11:40:26 -0400
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>,
        stephen.smalley.work@...il.com, casey@...aufler-ca.com
Cc:     tyhicks@...ux.microsoft.com, tusharsu@...ux.microsoft.com,
        sashal@...nel.org, 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] IMA: Handle early boot data measurement

On Fri, 2020-08-21 at 16:12 -0700, Lakshmi Ramasubramanian wrote:
> The current implementation of early boot measurement in
> the IMA subsystem is very specific to asymmetric keys. It does not
> handle early boot measurement of data from other subsystems such as
> Linux Security Module (LSM), Device-Mapper, etc. As a result data,
> provided by these subsystems during system boot are not measured by IMA.
> 
> Update the early boot key measurement to handle any early boot data.
> Refactor the code from ima_queue_keys.c to a new file ima_queue_data.c.
> Rename the kernel configuration CONFIG_IMA_QUEUE_EARLY_BOOT_KEYS to
> CONFIG_IMA_QUEUE_EARLY_BOOT_DATA so it can be used for enabling any
> early boot data measurement. Since measurement of asymmetric keys is
> the first consumer of early boot measurement, this kernel configuration
> is enabled if IMA_MEASURE_ASYMMETRIC_KEYS and SYSTEM_TRUSTED_KEYRING are
> both enabled.
> 
> Update the IMA hook ima_measure_critical_data() to utilize early boot
> measurement support.

Please limit the changes in this patch to renaming the functions and/or
files.  For example, adding "measure_payload_hash" should be a separate
patch, not hidden here.

Mimi