If you're very clever (unlike me) and you break into a modern running system, you'll find that there are a lot of protections to stop you just inserting your ow

If you're very clever (unlike me) and you break into a modern running system, you'll find that there are a lot of protections to stop you just inserting your own code and running it. Smart people will look at the current executable code in the system, and work out how to manipulate the existing executable code to build the attacker's programs (return oriented programming); the identified chunks are called gadgets.