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

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Date:   Fri, 05 Jun 2020 17:34:27 -0400
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>,
        Paul Moore <paul@...l-moore.com>
Cc:     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 Fri, 2020-06-05 at 14:09 -0700, Lakshmi Ramasubramanian wrote:
> 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);

Yes, AUDIT_INTEGRITY_PCR is also used for failures to add to the
measurement list.

thanks,

Mimi