linux-kernel - ima - wait for tpm load

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Date:   Thu, 10 Jun 2021 09:16:33 +0200
From:   "Jorge Ramirez-Ortiz, Foundries" <jorge@...ndries.io>
To:     zohar@...ux.ibm.com, dmitry.kasatkin@...il.com, jmorris@...ei.org,
        serge@...lyn.com
Cc:     linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: ima - wait for tpm load

I am enabling IMA on a ZynqMP based platform using an SPI based TPM
from Infineon.

The SPI TPM driver is built-in but since the IMA is initalized from a
late_initcall, IMA never finds the TPM.

Is there a recomended way to work around this issue?

fio@...cg-dwg:~$ dmesg | grep tpm
[    3.381181] tpm_tis_spi spi1.1: 2.0 TPM (device-id 0x1B, rev-id 22)
[    3.423608] tpm tpm0: A TPM error (256) occurred attempting the self test
[    3.430406] tpm tpm0: starting up the TPM manually

fio@...cg-dwg:~$ dmesg | grep ima
[    3.525741] ima: No TPM chip found, activating TPM-bypass!
[    3.531233] ima: Allocated hash algorithm: sha1

TIA

jorge