Vanilla Android allow direct SU/Root access

Question

I am using a custom Android ROM for an embedded board and creating an initialisation/setup app that will need root.

I have been able to run my root level program using Super SU no problem. I would like to bypass Super SU and have my app gain access to SU directly. Is this possible and if so, how?

By the way, I have the ability to customise the ROM before deployment.

Answer 1

It is not possible

See how su work:When an app calls su the su binary get active and notify supersu app for and supersu prompts for root and then that decision goes to su binary and it performs that action

When it can be possible

It is possible when you use a vulnerability like futex vulnerability to setuid() to 0 and execute you command

Answer 2

Just use the original Android su provided by Google.