bizarre packet labelings

[Stephen Smalley]

On Wed, 2009-06-17 at 10:18 -0700, brian retford wrote:
> We have a fairly customized centos 5.3 distribution, but I know of
> nothing that would cause the behavior I'm seeing. We don't use
> iptables or ipsec, secmark is enabled in the kernel. I get avc denied
> messages for packets that almost certainly do exist, but the targets
> almost never make sense (at least to me), things like ls_exec_t,
> lib_t, and other seemingly random types. Thoughts?
> 
> avc:  denied  { send } for  pid=3202 comm="sshd" saddr=172.27.13.41
> src=22 daddr=172.27.134.1 dest=40428 netif=eth0
> scontext=system_u:system_r:unconfined_t:s0-s0:c0.c1023
> tcontext=system_u:object_r:lib_t:s0 tclass=packet

If you haven't configured iptables to mark packets with those contexts,
then you shouldn't get any such denials.

So either you have a weird iptables configuration or you have a kernel
bug.

What kernel are you using?

-- 
Stephen Smalley
National Security Agency