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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Josh Berkus <josh@agliodbs.com>
Cc: Kohei KaiGai <kaigai@kaigai.gr.jp>
Cc: ktm@rice.edu <ktm@rice.edu>
Cc: Alexander Korotkov <aekorotkov@gmail.com>
Cc: Oleg Bartunov <obartunov@gmail.com>
Cc: Greg Smith <greg@2ndquadrant.com>
Cc: PgHacker <pgsql-hackers@postgresql.org>
Subject: Re: [v9.4] row level security
Date: Thu, 29 Aug 2013 13:18:21 -0400
Message-ID: <9407.1377796701@sss.pgh.pa.us> (raw)
In-Reply-To: <521F7DFB.8060602@agliodbs.com>
References: <51E8A8C1.2050700@2ndQuadrant.com>
	<20130719030347.GV15510@tamriel.snowman.net>
	<51E8ADD9.5020600@2ndQuadrant.com>
	<CAEZATCXdj4E8uPHxq7jiE=1gGVB0xyeHtE8wUjHoX385sHhx4Q@mail.gmail.com>
	<CADyhKSWw1RY01tyuhRzu2HAa_+B9Z5qS6Jv+HEA1w0C9Ua2QLQ@mail.gmail.com>
	<521D1C2B.8090503@2ndQuadrant.com>
	<CAF4Au4xDXzACfC_KrXXpu=4et3XhUe5NtK=6y6yq39Cs2U0XKg@mail.gmail.com>
	<CADyhKSWkHrPqbRsFK0LjPMOOTsbKGWOuN75GqYJrxCDO3CKWtA@mail.gmail.com>
	<CAPpHfdsgMrBnzu9um48O6kwY=_pRFuRrBrHqnA03fCAo8x3-Gg@mail.gmail.com>
	<CADyhKSUpcYKNm3rQRwCFqkTZfO3_ZrqYKjAqDxKeA6WeLezSbw@mail.gmail.com>
	<20130829142321.GA30496@aart.rice.edu>
	<CADyhKSUD7qdQeTndZ6mDpp05V6MnRBzQO1FmYBq1+Zp37oyRrg@mail.gmail.com>
	<WM!685df689dd4d8f8c5349d5ef7b8e285db1e99ea32d22ab5d35f3981c29eac19dbd725c9b5e0227def9d782de274d1354!@asav-3.01.com>
	<521F7DFB.8060602@agliodbs.com>
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Josh Berkus <josh@agliodbs.com> writes:
> It's one thing to day "we can't solve this covert channel issue right
> now in this patch", but saying "we don't plan to solve it at all" is
> likely to doom the patch.

> I'm not sure what the solution would be, exactly.  Deny permission for
> EXPLAIN on certain tables?

That would close only one covert channel.  Others were already pointed out
upthread, and I'll bet there are more ...

			regards, tom lane


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