What the heck is a dbus?

[John Abreau]

Dan Coutu wrote:
> On a new installation of Centos 4.2 (a RHEL clone from source) I'm 
> seeing the following error in the messages file:
> 
> Mar  3 15:55:06 hanka dbus: Can't send to audit system: USER_AVC 
> pid=2521 uid=81 loginuid=-1 message=avc:  denied  { send_msg } for  
> scontext=root:system_r:unconfined_t tcontext=user_u:system_r:initrc_t 
> tclass=dbus
> 
> 
> I've never heard of a dbus. So first of all, what's a dbus, and 
> secondly, what does this error mean?
> 
> Thanks for any insights that you can share!
> 

As others have mentioned already, dbus is related to the hald, and I 
believe the two were first introduced with the 2.6 kernel.

I haven't seen a reply about your error message yet. That error is 
coming from SElinux, and probably means you need to adjust an access 
list somewhere. If you can figure out what service the error is coming
from, you can try running system-config-securitylevel to adjust the
rules for that service.

For example, if the error is coming from apache, the easiest workaround 
is to allow the httpd daemon to run unrestricted.

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John Abreau / Executive Director, Boston Linux & Unix
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