Tom Lane wrote:

> It strikes me that given the postmaster's infrastructure for listening
> on multiple sockets, it would be a pretty small matter of programming
> to teach it to listen on socket files in multiple directories not only
> one.

The problem with this idea is that if the postmaster goes away, both
sockets go away, which means the attacker can place his socket in /tmp
as he sees fit.

-- 
Alvaro Herrera                                http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.

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