Backporting stacked security patch

[Lev Olshvang]

Hi All,

I week ago I asked the list about kernel 4.2 stacked security patch location , but 
Greg strongly advised me against, without going into details.
I highly appreciate Greg advice, and I know he is a very busy person.
Unfortunately I do not have a choice to upgrade kernel, and I am asking again :
- what are major challenges of a such backport ? 
Does kernel security changed so much between 3.18 and 4.2 ?

The link is https://kernelnewbies.org/Linux_4.2#Stacking_of_security_modules

Regards, Lev