From: Walden H. Leverich
This is simply untrue.and
The buffer overrun exploits that allow you to raise your security level
thus take over a machine are not possible in i5/OS.
I'll say it, since Patrick is probably too nice to do so...
Joe, taking on Patrick Botz, IBM's lead security architect for i5/OS and
the IBM Virtualization Engine, about what's possible and not possible in
i5/OS security is probably a losing battle. IF, and I stress, IF, there
are possible exploits for i5/OS, he's the one to know!