Re: should we allow users with a predefined role to access pg_backend_memory_contexts view and pg_log_backend_memory_contexts function?

On Tue, Oct 12, 2021 at 8:33 PM Stephen Frost <sfrost@snowman.net> wrote:
> Or not. I can see the argument that, because it just goes into the log, that it doesn’t make sense to grant to a predefined role, since that role wouldn’t be able to see the results even if it had access.

Yeah. I think we should really only use predefined roles where it's
not practical to have people use GRANT/REVOKE.

For instance, it makes sense to have pg_execute_server_program because
there's no particular function (or other object) to which you could
grant permissions at the SQL level to achieve the same results. And
pg_read_all_stats doesn't just allow you to run more functions: it
changes which fields those functions populate in the returned data,
and which they mask out for security reasons. So, GRANT/REVOKE
wouldn't do it in that case.

But if there's one particular function that someone may or may not
want a non-superuser to be able to execute, let's just let them do
that. It doesn't need to be tied to a predefined role, and in fact
it's more flexible if it isn't.

-- 
Robert Haas
EDB: http://www.enterprisedb.com