Re: [HACKERS] permission issue

>
> Tables INS (x int) and SEL (y int) are owned by dbadm, for another
> user SELECT granted on SEL, INSERT - on INS.
>
> Should another user be able to do
>
> insert into ins select y from sel where x = y;

My guess is that the other user doesn't have SELECT permissions on
INS.y, so this should fail, no?

>
> or not ?
> Currently, PG allows this. Backend tries to check
> (in execMain.c:ExecCheckPerms()) is READ access to
> table being changed granted to user or not, but this check
> seems to be quite stupid:
>
>             qvars = pull_varnos(parseTree->qual);
>             tvars = pull_varnos((Node *) parseTree->targetList);
>             if (intMember(resultRelation, qvars) ||
>                 intMember(resultRelation, tvars))
>
> : pull_varnos is very simple and just skips expressions in
> qual & target list.
>
> We have to either get rid of this check or change it.
>
> What do you think ?
> How "big boys" handle this ?
>
> Vadim
>
>


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