Restrict pg_relation_size to relation owner, pg_database_size to DB owner,

and pg_tablespace_size to superusers.  Perhaps we could weaken the first
case to just require SELECT privilege, but that doesn't work for the
other cases, so use ownership as the common concept.

src/backend/utils/adt/dbsize.c

@@ -5,7 +5,7 @@
  * Copyright (c) 2002-2007, PostgreSQL Global Development Group
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/adt/dbsize.c,v 1.12 2007/03/11 05:22:00 alvherre Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/adt/dbsize.c,v 1.13 2007/08/27 01:19:14 tgl Exp $
  *
  */
 
@@ -22,6 +22,7 @@
 #include "commands/tablespace.h"
 #include "miscadmin.h"
 #include "storage/fd.h"
+#include "utils/acl.h"
 #include "utils/builtins.h"
 #include "utils/syscache.h"
 #include "utils/relcache.h"
@@ -121,6 +122,10 @@ pg_database_size_oid(PG_FUNCTION_ARGS)
 {
 	Oid			dbOid = PG_GETARG_OID(0);
 
+	if (!pg_database_ownercheck(dbOid, GetUserId()))
+		aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_DATABASE,
+					   get_database_name(dbOid));
+
 	PG_RETURN_INT64(calculate_database_size(dbOid));
 }
 
@@ -136,6 +141,10 @@ pg_database_size_name(PG_FUNCTION_ARGS)
 				 errmsg("database \"%s\" does not exist",
 						NameStr(*dbName))));
 
+	if (!pg_database_ownercheck(dbOid, GetUserId()))
+		aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_DATABASE,
+					   NameStr(*dbName));
+
 	PG_RETURN_INT64(calculate_database_size(dbOid));
 }
 
@@ -203,6 +212,11 @@ pg_tablespace_size_oid(PG_FUNCTION_ARGS)
 {
 	Oid			tblspcOid = PG_GETARG_OID(0);
 
+	if (!superuser())
+		ereport(ERROR,
+				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
+				 (errmsg("must be superuser to use pg_tablespace_size"))));
+
 	PG_RETURN_INT64(calculate_tablespace_size(tblspcOid));
 }
 
@@ -212,6 +226,11 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 	Name		tblspcName = PG_GETARG_NAME(0);
 	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName));
 
+	if (!superuser())
+		ereport(ERROR,
+				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
+				 (errmsg("must be superuser to use pg_tablespace_size"))));
+
 	if (!OidIsValid(tblspcOid))
 		ereport(ERROR,
 				(errcode(ERRCODE_UNDEFINED_OBJECT),
@@ -270,6 +289,10 @@ pg_relation_size_oid(PG_FUNCTION_ARGS)
 
 	rel = relation_open(relOid, AccessShareLock);
 
+	if (!pg_class_ownercheck(RelationGetRelid(rel), GetUserId()))
+		aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_CLASS,
+					   RelationGetRelationName(rel));
+
 	size = calculate_relation_size(&(rel->rd_node));
 
 	relation_close(rel, AccessShareLock);
@@ -288,6 +311,10 @@ pg_relation_size_name(PG_FUNCTION_ARGS)
 	relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
 	rel = relation_openrv(relrv, AccessShareLock);
 
+	if (!pg_class_ownercheck(RelationGetRelid(rel), GetUserId()))
+		aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_CLASS,
+					   RelationGetRelationName(rel));
+
 	size = calculate_relation_size(&(rel->rd_node));
 
 	relation_close(rel, AccessShareLock);
@@ -309,6 +336,11 @@ calculate_total_relation_size(Oid Relid)
 	ListCell   *cell;
 
 	heapRel = relation_open(Relid, AccessShareLock);
+
+	if (!pg_class_ownercheck(RelationGetRelid(heapRel), GetUserId()))
+		aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_CLASS,
+					   RelationGetRelationName(heapRel));
+
 	toastOid = heapRel->rd_rel->reltoastrelid;
 
 	/* Get the heap size */
@@ -348,6 +380,8 @@ pg_total_relation_size_oid(PG_FUNCTION_ARGS)
 {
 	Oid			relid = PG_GETARG_OID(0);
 
+	/* permission check is inside calculate_total_relation_size */
+
 	PG_RETURN_INT64(calculate_total_relation_size(relid));
 }
 
@@ -361,6 +395,8 @@ pg_total_relation_size_name(PG_FUNCTION_ARGS)
 	relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
 	relid = RangeVarGetRelid(relrv, false);
 
+	/* permission check is inside calculate_total_relation_size */
+
 	PG_RETURN_INT64(calculate_total_relation_size(relid));
 }