med.c

/**
 * Compile:
 *   32-bit:
 *      gcc -o med32 -m32 -fno-stack-protector med.c
 *   64-bit:
 *      gcc -o med64 -fno-stack-protector med.c
 *
 * Turn off ASLR:
 *      sudo systctl -w kernel.randomize_va_space=0
**/ 

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


void vulnerable() {
    char buf[1024];

    memset(buf, 0x0, 1024);

    write(1, "Enter some text: ", 17);
    read(0, buf, 2048);

    printf("Your string: %s", buf);
}

int main(int argc, char * argv[], char * envp[]) {
    vulnerable();
    return 0;
}