execve shellcode linux segmentation fault

Question

Im trying to run this shellcode but it throws me: \"Segmentation fault\" error The shellcode is the following:

shellcode.asm:

global _start
_start:

         


        

Answer 1

Your problem is that the .text section is not writable by default. The easiest thing to do is put your code into a new custom section that is marked as writable. Add this line at the top of your asm file:

section .shellcode  progbits alloc exec write align=16

You could also pass the -N switch to the linker.

Alternatively, you could rewrite the shellcode so that it uses the stack to create the arguments.