linux-kernel - Re: [PATCH] IMA: Add log statements for failure conditions

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Date:   Fri, 5 Jun 2020 14:09:09 -0700
From:   Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
To:     Paul Moore <paul@...l-moore.com>
Cc:     Mimi Zohar <zohar@...ux.ibm.com>, linux-integrity@...r.kernel.org,
        tusharsu@...ux.microsoft.com, linux-kernel@...r.kernel.org,
        linux-audit@...hat.com
Subject: Re: [PATCH] IMA: Add log statements for failure conditions

On 6/5/20 1:49 PM, Paul Moore wrote:

> 
>> Since a pr_xyz() call was already present, I just wanted to change the
>> log level to keep the code change to the minimum. But if audit log is
>> the right approach for this case, I'll update.
> 
> Generally we reserve audit for things that are required for various
> security certifications and/or "security relevant".  From what you
> mentioned above, it seems like this would fall into the second
> category if not the first.
> 
> Looking at your patch it doesn't look like you are trying to record
> anything special so you may be able to use the existing
> integrity_audit_msg(...) helper.  Of course then the question comes
> down to the audit record type (the audit_msgno argument), the
> operation (op), and the comm/cause (cause).
> 
> Do you feel that any of the existing audit record types are a good fit for this?
> 

Maybe I can use the audit_msgno "AUDIT_INTEGRITY_PCR" with appropriate 
strings for "op" and "cause".

Mimi - please let me know if you think this audit_msgno would be ok to 
use. I see this code used, for instance, for boot aggregate measurement.

integrity_audit_msg(AUDIT_INTEGRITY_PCR, NULL, boot_aggregate_name, op,
		    audit_cause, result, 0);

thanks,
  -lakshmi