[ale] Linux: Secure and Limits?

[stevenrice at marnuke.penguinpowered.com (Steven Rice)]

Compare to other NIX's, how secure and how limiting is Linux?

limited in what it can do unless you account for Beowulf stuff.
But what about being secure?  Compare to larger UNIX'ies like 
HP-UX, AIX, Solaris, or SINIX how "secure" is Linux??  It seams
like it would be hard to setup a secure box (secure being able to
keep out the top .02% of crackers) due the amount of limits and 
nature buffer overflow in the kernel.

If you can give a example please do and send flames to /dev/null