Doing that at the Perl level is impossible, you may defeat some simple attacks but nothing else. Perl is too flexible and in this case, TIMTOWTDI plays against you!
Besides that, there are too many ways to gain complete control of the Perl interpreter: exploiting known bugs, forgering XS objects, unpack "p",..., etc.
A better approach would be do it at the OS level, using some MAC framework as AppArmor or running the code inside a virtual machine or a container.
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