Local root exploit topic

Hi,found one exploit from 2013 year, but its in exploit database as exploit from Feb.2014 ! Need some help for understanding something. Exploit is http://www.exploit-db.com/exploits/31574/

I understand principe, completed all steps expect 2 things which I not understand!

1. thing 1 - How to get thing which is explined in comment on line 34
2. thing - what is on line 39 !! How to get that || what is that || what is usage of that ??? Is that a phys address of the kernel func adress near sys_ni_syscall || sys_ni_syscall ???

Anyone explain, please?