Permission to Select

Hi all
the serious problem with permissions is encountered

NOTE: the following example is really useful but there is no room to
describe it's use.

db=# CREATE USER u;
db=# CREATE TABLE t (i int, a text);
db=# REVOKE all ON t FROM u;
db=# GRANT update,insert,delete ON t TO u;
db=# \c - u

db=> INSERT INTO t VALUES (1,'x');
INSERT
db=> UPDATE t SET a='y' WHERE i=1;
ERROR: Permission denied for relation t;
db=> UPDATE t SET a='y';
UPDATE

1) The user "u" is permitted but unable to perfom the operation !
2) A user is able to update WHOLE table but unable to update ANY part of
it !

Please examine the following patch and make your judgment:

--- src/backend/executor/execMain.c.orig 2005-11-22 1:23:08.000000000 +0300
+++ src/backend/executor/execMain.c 2006-02-17 13:19:29.000000000 +0300
@@ -460,6 +460,16 @@
bool do_select_into;
TupleDesc tupType;

+ if ( operation == CMD_UPDATE || operation == CMD_DELETE )
+ {
+ ListCell *l;
+ foreach(l, parseTree->rtable)
+ {
+ RangeTblEntry *rte = lfirst(l);
+ rte->requiredPerms ^= ACL_SELECT;
+ }
+ }
+
/*
* Do permissions checks. It's sufficient to examine the query's top
* rangetable here --- subplan RTEs will be checked during