[CentOS] SELinux : please explain ...

Daniel J Walsh dwalsh at redhat.com
Wed Aug 1 15:45:43 UTC 2012


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On 08/01/2012 04:01 AM, Philippe Naudin wrote:
> Hello,
> 
> This is somehow off-topic, since the problem appears on a modified 
> CentOS-6.2 (turned into a xen-4.1 host) : I get SELinux errors, and I'm not
> able to understand them.
> 
>> From audit2why :
> type=AVC msg=audit(1343724164.898:298772): avc:  denied  { mac_admin } for
> pid=12399 comm="restore" capability=33
> scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
> tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
> tclass=capability2
> 
> ... and from audit2allow : #============= unconfined_t ============== allow
> unconfined_t self:capability2 mac_admin;
> 
> I don't know what triggers these records in /var/log/audit (everything 
> seems to work). Running retorecon -rv / doesn't produce any error.
> 
> Can someone tell me what is the mac_admin functionnality, and if it is safe
> to allow it ? If I understand correctly what I have found by googling
> around, it is not advised.
> 
> Thanks,
> 

mac_admin means some where you have a command that is trying to set a file
context to something your current policy loaded into the kernel does not
understand.

Something like

touch /tmp/foobar
chcon -t unknownlabel /tmp/foobar

Would cause this AVC.

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