Force PL and range-type support functions to be owned by a superuser.

We allow non-superusers to create procedural languages (with restrictions)
and range datatypes.  Previously, the automatically-created support
functions for these objects ended up owned by the creating user.  This
represents a rather considerable security hazard, because the owning user
might be able to alter a support function's definition in such a way as to
crash the server, inject trojan-horse SQL code, or even execute arbitrary
C code directly.  It appears that right now the only actually exploitable
problem is the infinite-recursion bug fixed in the previous patch for
CVE-2012-2655.  However, it's not hard to imagine that future additions of
more ALTER FUNCTION capability might unintentionally open up new hazards.
To forestall future problems, cause these support functions to be owned by
the bootstrap superuser, not the user creating the parent object.

src/backend/catalog/pg_aggregate.c

@@ -233,6 +233,7 @@ AggregateCreate(const char *aggName,
 							  false,	/* no replacement */
 							  false,	/* doesn't return a set */
 							  finaltype,		/* returnType */
+							  GetUserId(),		/* proowner */
 							  INTERNALlanguageId,		/* languageObjectId */
 							  InvalidOid,		/* no validator */
 							  "aggregate_dummy",		/* placeholder proc */

src/backend/catalog/pg_proc.c

@@ -69,6 +69,7 @@ ProcedureCreate(const char *procedureName,
 				bool replace,
 				bool returnsSet,
 				Oid returnType,
+				Oid proowner,
 				Oid languageObjectId,
 				Oid languageValidator,
 				const char *prosrc,
@@ -100,7 +101,6 @@ ProcedureCreate(const char *procedureName,
 	bool		internalInParam = false;
 	bool		internalOutParam = false;
 	Oid			variadicType = InvalidOid;
-	Oid			proowner = GetUserId();
 	Acl		   *proacl = NULL;
 	Relation	rel;
 	HeapTuple	tup;

src/backend/commands/functioncmds.c

@@ -978,6 +978,7 @@ CreateFunction(CreateFunctionStmt *stmt, const char *queryString)
 					stmt->replace,
 					returnsSet,
 					prorettype,
+					GetUserId(),
 					languageOid,
 					languageValidator,
 					prosrc_str, /* converted to text later */

src/backend/commands/proclang.c

@@ -18,6 +18,7 @@
 #include "catalog/dependency.h"
 #include "catalog/indexing.h"
 #include "catalog/objectaccess.h"
+#include "catalog/pg_authid.h"
 #include "catalog/pg_language.h"
 #include "catalog/pg_namespace.h"
 #include "catalog/pg_pltemplate.h"
@@ -124,6 +125,7 @@ CreateProceduralLanguage(CreatePLangStmt *stmt)
 										 false, /* replace */
 										 false, /* returnsSet */
 										 LANGUAGE_HANDLEROID,
+										 BOOTSTRAP_SUPERUSERID,
 										 ClanguageId,
 										 F_FMGR_C_VALIDATOR,
 										 pltemplate->tmplhandler,
@@ -160,6 +162,7 @@ CreateProceduralLanguage(CreatePLangStmt *stmt)
 											false,		/* replace */
 											false,		/* returnsSet */
 											VOIDOID,
+											BOOTSTRAP_SUPERUSERID,
 											ClanguageId,
 											F_FMGR_C_VALIDATOR,
 											pltemplate->tmplinline,
@@ -199,6 +202,7 @@ CreateProceduralLanguage(CreatePLangStmt *stmt)
 										 false, /* replace */
 										 false, /* returnsSet */
 										 VOIDOID,
+										 BOOTSTRAP_SUPERUSERID,
 										 ClanguageId,
 										 F_FMGR_C_VALIDATOR,
 										 pltemplate->tmplvalidator,

src/backend/commands/typecmds.c

@@ -38,6 +38,7 @@
 #include "catalog/dependency.h"
 #include "catalog/heap.h"
 #include "catalog/indexing.h"
+#include "catalog/pg_authid.h"
 #include "catalog/pg_collation.h"
 #include "catalog/pg_constraint.h"
 #include "catalog/pg_depend.h"
@@ -1513,6 +1514,7 @@ makeRangeConstructors(const char *name, Oid namespace,
 								  false,		/* replace */
 								  false,		/* returns set */
 								  rangeOid,		/* return type */
+								  BOOTSTRAP_SUPERUSERID,		/* proowner */
 								  INTERNALlanguageId,	/* language */
 								  F_FMGR_INTERNAL_VALIDATOR,	/* language validator */
 								  prosrc[i],	/* prosrc */

src/include/catalog/pg_proc_fn.h

@@ -21,6 +21,7 @@ extern Oid ProcedureCreate(const char *procedureName,
 				bool replace,
 				bool returnsSet,
 				Oid returnType,
+				Oid proowner,
 				Oid languageObjectId,
 				Oid languageValidator,
 				const char *prosrc,