Apple keeps an ultra tight grip on iOS and is not keen on sharing its proprietary code. Even so, the company’s iBoot source code for iOS 9 was recently leaked to the web, and even though Apple’s mobile devices now run on iOS 11, it is very likely that some of the same code has been carried over. At least one security researcher called this

Source: Hot Hardware – iOS iBoot Source Code Was Leaked By Former Apple Engineering Intern