From mboxrd@z Thu Jan  1 00:00:00 1970
From: Steve Grubb <sgrubb@redhat.com>
Subject: Re: crond
Date: Wed, 7 Jan 2009 17:52:17 -0500
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On Wednesday 07 January 2009 05:40:14 pm Eric Paris wrote:
> in man auditctl you talk about the "exclude" list.

Yes, I thought about that, too. This is what you have to work with:

type=USER_START msg=audit(1231365661.252:161): user pid=4681 uid=0 auid=0 
ses=14 subj=system_u:system_r:crond_t:s0-s0:c0.c1023 

This part is a string and cannot be matched against:
msg='op=PAM:session_open acct="root" exe="/usr/sbin/crond" (hostname=?, 
addr=?, terminal=cron res=success)'

If the type filter allows matching by selinux context, then you might be able 
to say:

-a always,exclude -F msgtype=USER_START -F auid=0 -F subj_type=crond_t

-Steve