COMMAND

    tmpfs(4)

SYSTEMS AFFECTED

    SunOS 4.1.x

PROBLEM

    Unprivileged users can panic the  SunOS 4.1.x kernel if the  TMPFS
    filesystem is in use.

    Assuming /tmp is a tmpfs filesystem:

        % cd /tmp
        % /usr/etc/mknod fifo p
        % ln fifo link
        % ls -ClFg link fifo

    The  problem  actually  occurs  with  any  'special'  file  on the
    tmpfs filesystem.  tmp_link()  incorrectly updates the link  count
    (va_nlink in  struct vattr)  in the  snode's vnode  rather than in
    the real vnode.

SOLUTION

    This  bug  can  be  fixed  by  the  patch  100507-06 (which is for
    SunOS4.1.3, but apply to SunOS4.1.4 anyway).