COMMAND

    /dev/tcx0

SYSTEMS AFFECTED

    SunOS 4.1.4

PROBLEM

    Dixon Ly  found following.   If you  try to  read /dev/tcx0  on  a
    SunOS 4.1.4 Sparc  20 or Sparc  5 you will  cause a system  panic.
    How  do  you  read  it,  you  ask?   Simply "cat /dev/tcx0" or "ls
    /dev/tcx0/*".  You don't need special privileges to use it.

SOLUTION

    These sorts of things are easily taken care of with /etc/fbtab  on
    SunOS4  and  /etc/logindevperm  on  Solaris2.   Any   framebuffer,
    keyboard, mouse, audio  device, etc should  have an entry  here to
    prevent these sorts of pranks.

    Workaround:

        1. Install tcx frame buffer.
        2. Edit GENERIC file as below and create new kernel.
        < device-driver tcx             # 24-bit accelerated color frame buffer
        ---
        > #device-driver        tcx             # 24-bit accelerated color frame buffer