Attached is my proposed patch for this problem, to be put in 7.4.1.
Please someone give it a quick check.
Tom Lane wrote:
> Peter Eisentraut <peter_e@gmx.net> writes:
> > Tom Lane wrote:
> >> Uh, no, because you can say something like
> >> revoke all on language plperlu from public;
> >> and end up with non-null lanacl (because it instantiates the
> >> default assumption that the owner has all privileges).
> >
> > OK, that needs to be disallowed.
>
> Fair enough. I thought it was a bit odd to disallow GRANT but allow
> REVOKE anyway.
>
> >> We could possibly hack the backend to avoid that, but I think
> >> pg_dump will need the special-case test anyway since it has to be
> >> able to cope with existing databases, wherein lanacl may be
> >> non-null.
> >
> > So far we know of 1 such database. I'd like to see some more
> > before we bother about it.
>
> It's a one-line addition --- just put the dumpACL call inside
> "if (lanpltrusted)". I think it is a reasonable change. We'd have
> to do something anyway, because the existing pg_dump code is
> certainly broken for dumping untrusted languages from pre-7.3
> databases (it assumes a nonempty lanacl setting in that case).