Re: Where should port rights go?

[Niklas Höglund]

> > Many ways to implement port rights come to mind. Here are some ideas:
> <snip>
> 
> 9. port-rights entirely managed by concerned parties:
> 
>    * every communicating party is uniquely identified by its
>      sender-id/receiver-id. This information is provided by
>      the kernel/libmom and is considered trusted.
>
> [...]
>
>    - slight chance of forgeability by clients that poll every random-id
>      from a server (guessing id's).

If you check (and trust) the sender ID of a message, how can an
untrusted client (whos sender ID doesn't match any trusted ones) to
find a way in?  Is it possible (in L4) to forge the sender ID in a
message?

-- 
                                           Niklas