sunrpc port allocation and IANA reserved list

[Chris Friesen]

By default sunrpc ports are allocated at random in the range 665-1023U.
 However, there are many ports within this range which have been
reserved by the IANA (and others like port 921 which are not formally
reserved but are "well-known").

Given that a userspace application can be stopped and restarted at any
time, and a sunrpc registration can happen at any time, what is the
expected mechanism to prevent the kernel from allocating a port for use
by sunrpc that reserved or well-known?

Apparently Redhat and Debian have distro-specific ways of dealing with
this, but is there a standard solution?  Should there be?

The current setup seems suboptimal.

Chris
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