The SELinux is not secret closed code.
So please don't post about "backdoors" with out proof.
The lack of logic makes us all look stupid and paranoid.
It's not stupid and paranoid to be cynical of things - some will say it's paranoid. But if one takes human history as a 'guideline' in which to measure things - you would in fact be stupid to not be wary of big government and corporations.
But yes, without proof - it's a baseless conclusion that one could jump to.
From what I gathered, it appears Ubuntu uses 'apparmor' and not 'SELinux' - but I haven't dug that far.
One thing though - to take into consideration about *any* backdoor, is that it should be well known to any IT professional that in many cases, *other* machines can and do monitor the activity of various hosts.
On other words - if Microsoft was to put in a back door that communicates with other machines, a Linux server (whatever flavor) could potentially be monitoring all network traffic and detect it.
That's what got RealNetworks into a whole heap of trouble years ago and likely has a lot to do with them never becoming the real 'video standard' in computing. Old news, but I doubt many remember it or never about it.http://news.cnet.com/2100-1001-232766.html
Steve Gibson was the one, I believe - who exposed them: http://www.grc.com/downloaders.htm