RPM security (a newbie question)

["Stanisław T. Findeisen"]

What does the process of installing new RPM package look like? There are 
some commands that such package is allowed to execute, right?

What are RPMs allowed to do, and what is forbidden? Is there any control 
layer at all in the package manager, or is the control (e.g., during 
package install) simply transferred to RPM-package-provided script??

Also what's the difference between "Everything" and "Fedora" dirs in 
Fedora package tree?

I wonder how easy it is to create a rootkit/trojan horse/whatever and 
get it loaded on Fedora users' computers.

Thanks!

STF

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http://eisenbits.homelinux.net/~stf/
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