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The primary role of PL validators is to be called implicitly during CREATE FUNCTION, but they are also normal functions that a user can call explicitly. Add a permissions check to each validator to ensure that a user cannot use explicit validator calls to achieve things he could not otherwise achieve. Back-patch to 8.4 (all supported versions). Non-core procedural language extensions ought to make the same two-line change to their own validators. Andres Freund, reviewed by Tom Lane and Noah Misch. Security: CVE-2014-0061