Self modifying code always segmentation faults on Linux

Question

i found an article about self modifying code and tried to do some examples, but i get always segmentation faults. As fas as i can understand, there is a violation in memory

Answer 1

Modern CPUs have a feature called DEP which prevents execution of code on the stack. Previously, this was possible; now, it is not. The binary is loaded into read-only memory by default.

With that out of the way, you can use the mprotect system call to mark your binary's location in memory as executable - SO LONG AS YOUR CODE IS NOT DEP-PROTECTED. So don't try to put code and the stack and then jump into it.