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Guidelines for writing trusted software

Using library routines

A trusted command must never use an untrusted library routine. This restriction means that a trusted command must never use a library routine that has an untrusted call anywhere in its calling sequence, nor a library routine that causes an untrusted command to be executed. The information derived from the untrusted command might influence the behavior of the trusted command, or the command might give away extraordinary access to the untrusted command; neither action is acceptable.


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