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Bug 670938 - searching on auid = -1 results in all events
Summary: searching on auid = -1 results in all events
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: audit
Version: 6.0
Hardware: Unspecified
OS: Unspecified
high
medium
Target Milestone: rc
: ---
Assignee: Steve Grubb
QA Contact: BaseOS QE Security Team
URL:
Whiteboard:
Depends On:
Blocks: 706156
TreeView+ depends on / blocked
 
Reported: 2011-01-19 17:31 UTC by Steve Grubb
Modified: 2018-12-07 13:55 UTC (History)
0 users

Fixed In Version: audit-2.0.6-1.el6
Doc Type: Bug Fix
Doc Text:
System processes, that is processes with an audit id (auid) of -1 are logged by the audit subsystem. However, if the ausearch utility was used to locate events where the auid was -1, it would display all events. In this update, ausearch only returns events with an auid of -1.
Clone Of:
: 706156 (view as bug list)
Environment:
Last Closed: 2011-05-19 13:55:37 UTC
Target Upstream Version:
Embargoed:


Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2011:0653 0 normal SHIPPED_LIVE audit bug fix and enhancement update 2011-05-18 17:55:30 UTC

Description Steve Grubb 2011-01-19 17:31:40 UTC
Description of problem:
When an audit rules such as this is loaded on a 32 bit system:

-a exit,always -S creat -S open -S openat -S truncate -S ftruncate -F success=0 -F auid!=-1

System processes (ones with auid == -1) still get logged. This is because the auid is converted using a signed conversion and then compared in the kernel unsigned. Since 2147483647 does not equal 4294967295, the rule never triggers. Listing the rule back out with "auditctl -l" shows that auid=2147483647 (0x7fffffff) is loaded rather than 4294967295.

Comment 3 Steve Grubb 2011-02-02 13:32:09 UTC
In researching this problem, I found that it was already fixed by https://fedorahosted.org/audit/changeset/268

However during troubleshooting, I needed to get records for auid 4294967295 with ausearch. This resulted in all records rather than the one I wanted. My query was something like this:

ausearch -ul 4294967295 -if ./audit.log

Where audit.log had the following event

type=USER_AUTH msg=audit(1258740386.638:288): user pid=28360 uid=500 auid=500 ses=3 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 msg='op=PAM:authentication acct="root" exe="/usr/libexec/polkit-1/polkit-agent-helper-1" hostname=? addr=? terminal=? res=failed'

Comment 4 Steve Grubb 2011-02-02 13:33:49 UTC
Fixed by upstream commit:
https://fedorahosted.org/audit/changeset/439

Comment 5 Steve Grubb 2011-02-04 18:55:11 UTC
audit-2.0.6-1.el6 was built to fix this problem.

Comment 11 errata-xmlrpc 2011-05-19 13:55:37 UTC
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2011-0653.html


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