apache+php-fpm and security in shared enviroment compared to apache+suexec+mod_fastcgi

I've been using apache with suexec and mod_fcgid. It starts php handlers as
selected system user and listen to request via PIPES (fastcgi protocol). It
works well but can't share opcode between many handlers.
I've been investigating php-fpm aproach. What I can see is that in only
runs as tcp fastcgi server (like 127.0.0.1:9999) (under selected system
user) and apache has to conenct to it using FastCGIExternalServer or
fastcgi proxy mod. What the hell will stop other local users from
connecting to 127.0.0.1:9999 and passing their own code to handler that is
running as other system user? That seems totaly not secure in shared
enviroment. Am I missing something or what?

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