yum update / SELinux problem?

Stephen Smalley sds at tycho.nsa.gov
Fri Mar 2 12:05:46 UTC 2007

On Fri, 2007-03-02 at 00:06 +0000, Jonathan Rawle wrote:
> I have a problem installing updates via yum. I usually type
> sudo yum update
> and have sudoers set up to allow this. However, I've recently started to see
> messages of the form:
> error: %pre(packagename) scriptlet failed, exit status 255
> It seems to install the new package, but does not remove the old one, which
> has taken some sorting out!
> It also doesn't work if I su to root and type yum update. But it DOES work
> if I disable SELinux with setenforce 0
> I'm seeing the following AVC messages in dmesg:
> audit(1172787681.632:38): avc:  denied  { transition } for  pid=7147
> comm="yum" name="bash" dev=sda1 ino=2154415
> scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023
> tcontext=system_u:system_r:rpm_script_t:s0-s0:c0.c1023 tclass=process
> Seeing as we don't have everyone complaining that yum is broken, I assume my
> filesystem is wrongly labelled or something. I did fixfiles check and
> couldn't see anything that looked significant...
> Why is it xdm_t? Is it something to do with me using kdm as my login manager
> (most people use gdm)?
> So I wondered if anyone has any ideas of how to fix this? I don't want to
> have to switch off enforcing every time I do an update!

It shouldn't be running in xdm_t.  Update pam and logout and then back
in again.  Then check id -Z and make sure it isn't xdm_t.

Stephen Smalley
National Security Agency

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