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From: Jerry Snitselaar <jsnitsel@redhat.com>
To: Mimi Zohar <zohar@linux.ibm.com>, linux-integrity@vger.kernel.org
Subject: ima pcr question
Date: Mon, 13 Jan 2020 17:06:02 -0700	[thread overview]
Message-ID: <20200114000602.h5k5rr2k6zl3dlts@cantor> (raw)

We had a report of messages from ima saying "Error communicating with
TPM".  Looking into it a bit, it looks like with some Dell systems
(possibly others as well) in the bios they can set the hash algorithm
being used. In this case with that set to sha256 the messages
appear. Flipping the system to using sha1 makes them disappear.
Looking at the ima code, ima_calc_boot_aggregate_tfm hard codes using
sha1. Should that be changed to use whatever the default is in the
config, or possibly find out from the tpm what algorithm is being used?

Regards,
Jerry


             reply	other threads:[~2020-01-14  0:06 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-14  0:06 Jerry Snitselaar [this message]
2020-01-14  1:17 ` ima pcr question Mimi Zohar
2020-01-17 22:29   ` Jerry Snitselaar
2020-01-17 23:00     ` James Bottomley
2020-01-18 19:14       ` Jerry Snitselaar
2020-01-18 23:20         ` Jerry Snitselaar
2020-01-18 23:51           ` James Bottomley
2020-01-20  0:13             ` Mimi Zohar

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