Re: Multivariate MCV stats can leak data to unprivileged users

On Sat, 18 May 2019 at 16:13, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>
> Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> writes:
> > On the other hand, pg_dump relies on pg_statistic_ext to work out
> > which extended statistics objects to dump. If we were to change that
> > to use pg_stats_ext, then a user dumping a table with RLS using the
> > --enable-row-security flag wouldn't get any extended statistics
> > objects, which would be a somewhat surprising result.
>
> It seems like what we need here is to have a separation between the
> *definition* of a stats object (which is what pg_dump needs access
> to) and the current actual *data* in it. I'd have expected that
> keeping those in separate catalogs would be the thing to do, though
> perhaps it's too late for that.
>

Yeah, with the benefit of hindsight, that would have made sense, but
that seems like a pretty big change to be attempting at this stage.

Regards,
Dean