Skip to content

Instantly share code, notes, and snippets.

@securitytube
Created April 5, 2013 12:14
Show Gist options
  • Save securitytube/5318838 to your computer and use it in GitHub Desktop.
Save securitytube/5318838 to your computer and use it in GitHub Desktop.
C Program to test shellcode
#include<stdio.h>
#include<string.h>
unsigned char code[] = \
"\x31\xc0\x50\x68\x6e\x2f\x73\x68\x68\x2f\x2f\x62\x69\x89\xe3\x50\x89\xe2\x53\x89\xe1\xb0\x0b\xcd\x80";
main()
{
printf("Shellcode Length: %d\n", strlen(code));
int (*ret)() = (int(*)())code;
ret();
}
@zeredy879
Copy link

zeredy879 commented Aug 25, 2023

Here is another example to run x86 shellcode on x64 machine but specify the memory address where you want to load your shellcode:

# include <stdio.h>
# include <string.h>
# include <unistd.h>
# include <sys/mman.h>

# define EXEC_MEM ((void *) 0x80000000)

char shellcode[] = "{write your shellcode here}";

int main() {{
    mmap(EXEC_MEM, 0x1000, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_ANONYMOUS | MAP_FIXED | MAP_PRIVATE, -1, 0);
    memcpy(EXEC_MEM, (void *)shellcode, strlen(shellcode)+1);
    (*(int (*)())EXEC_MEM)();
    return 0;
}

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment