All ports are owned by root anyway, depending on what services are started up on boot. You do become root to execute kppp (only root either by suing TO root, or root 'natural' can establish the pppd session), but the rest is still the normal user's X session. (i.e. you log in as regular user, you open a terminal and su -, you are still logged in as the regular user, and anything spawned by the user is the user. Only that specific su'ed terminal is root). Hope that makes sense.
There would have to be a buffer overflow in pppd or some such thing (beyond unlikley at this time) with a very strange TCP/IP sequence, and as soon as pppd was taken over? if it can be, your connection drops due to timeout and the 'cracker' would be hosed. I just don't think that can happen.
RO
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