linux-kernel - Re: [PATCH AUTOSEL 5.7 03/30] ima: extend boot

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Message-ID: <fccbb614-3a73-651d-b2f4-fb98ff4022f5@linux.ibm.com>
Date:   Mon, 28 Dec 2020 14:28:38 -0500
From:   Ken Goldman <kgold@...ux.ibm.com>
To:     Mimi Zohar <zohar@...ux.ibm.com>,
        James Bottomley <James.Bottomley@...senPartnership.com>,
        Tyler Hicks <tyhicks@...ux.microsoft.com>
Cc:     Sasha Levin <sashal@...nel.org>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Maurizio Drocco <maurizio.drocco@....com>,
        Bruno Meneguele <bmeneg@...hat.com>,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 5.7 03/30] ima: extend boot_aggregate with kernel
 measurements

On 12/12/2020 9:22 PM, Mimi Zohar wrote:
> Ok.   Going forward, it sounds like we need to define a new
> "boot_aggregate" record.  One that contains a version number and PCR
> mask.

Just BTW, there is a TCG standard for a TPM 2.0 PCR mask that works
well.

There is also a standard for an event log version number.  It is
the first event of a TPM 2.0 event log.  It is strange.

One useful field, though, is a mapping between the algorithm ID (e.g.,
sha256 is 0x000b) and the digest size (e.g., 32 bytes).  This permits
a parser to parse a log even when it encounters an unknown digest
algorithm.