Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!

http://en.tldp.org/LDP/solrhe/Securing-Optimizing-Linux-RH-Edition-v1.3/x4733.html

https://stackoverflow.com/questions/14471564/what-does-ulimit-s-unlimited-do

https://access.redhat.com/solutions/384633