> > It's a proper denial of service on Plan 9... I ran it while > cpu'd into another box and found that somehow it killed *both* > machines. IIRC, Plan 9 doesn't really have any kind of resource > limiting, does it? (Yeah, I know, not necessary for a terminal, > but it should be important for a cpu server) >
this is a problem for unix and plan 9. as soon as you try resource limiting, you have a new way to dos a machine. force the hostowner (or root) to use up his allotment. okay, the unix guys have thought of this and so they limit the number of ssh connections. the problem is that if you access as root to the box is via ssh, you're still done. i don't see an easy systematic solution to this type of problem. as was discussed a few months ago, any system that has unreserved stack allocation can suffer from similiar problems. the oom killer on linux is a symptom of this kind of problem. - erik
