General :: Rooting All Devices Programmatically

I am an android application developer and I'd like to write an application, which is rooting the phone.There was a time(Android 2.2 and older), when rooting was not really a big thing.Changing the rwx permissions of two files by running two "chmod" terminal commands was enough on nearly every device to root them.

But then it went more difficult. It is still possible programmatically. Here is an idea:

We could use Assembler and native C to generate a Puffer overflow by calling a Unix system call like here(URL....).Then we could get some code, which would be able to change the file permissions coz it's running in Kernel mode, into the Kernel this way.