Linux's security

Hi all,
 
I have been discussing Linux's security at a more profound level, and I would 
like any security expert's input on the discussion. This discussion is quite 
in-depth, as it deals more with reference monitors, SELinux's implementation, 
LIDS, permissions, privileges and ACLs, and other features, rather than 
practical security like IDSs, firewalls, etc. If you would like to take a look, 
please click on the following link - and feel free to post something if you 
have a constructive and well-based comment. I would greatly appreciate any 
positive contributions to this discussion, as it has really got me thinking! In 
fact, most of it is beyond my level of expertise. 
Here it is: http://wolphination.com/linux/2006/04/24/linux-and-security/ 
 
It is quite long, so if you would like, you can read catch's last message there 
in the main post, and then the comments below the article, which continue the 
discussion. If there are any security experts/professionals on this mailing 
list (which I am sure there are!), then any added input would be appreciated. 
If not, I hope you all enjoy the read :-) 
 
Regards,
 
-Max