doc: warn of SECURITY DEFINER schemas for non-sql_body functions

bmomjian · bmomjian · commit a3471ab93ac2 · 2022-08-31T21:10:37.000-04:00
Non-sql_body functions are evaluated at runtime. Reported-by: Erki Eessaar Discussion: https://postgr.es/m/AM9PR01MB8268BF5E74E119828251FD34FE409@AM9PR01MB8268.eurprd01.prod.exchangelabs.com Backpatch-through: 10
diff --git a/doc/src/sgml/ref/create_function.sgml b/doc/src/sgml/ref/create_function.sgml
@@ -715,7 +715,10 @@ SELECT * FROM dup(42);
    <para>
     Because a <literal>SECURITY DEFINER</literal> function is executed
     with the privileges of the user that owns it, care is needed to
-    ensure that the function cannot be misused.  For security,
+    ensure that the function cannot be misused.  This is particularly
+    important for non-<replaceable>sql_body</replaceable> functions because
+    their function bodies are evaluated at run-time, not creation time.
+    For security,
     <xref linkend="guc-search-path"/> should be set to exclude any schemas
     writable by untrusted users.  This prevents
     malicious users from creating objects (e.g., tables, functions, and
