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To: Kris Kennaway <kris@obsecurity.org>
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Comments: In-reply-to Kris Kennaway <kris@obsecurity.org>
	message dated "Sun, 02 Apr 2006 23:21:30 -0400"
Date: Sun, 02 Apr 2006 23:26:52 -0400
Message-ID: <27571.1144034812@sss.pgh.pa.us>
From: Tom Lane <tgl@sss.pgh.pa.us>
Cc: "Marc G. Fournier" <scrappy@postgresql.org>, freebsd-stable@freebsd.org,
	pgsql-hackers@postgresql.org
Subject: Re: [HACKERS] semaphore usage "port based"? 
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Kris Kennaway <kris@obsecurity.org> writes:
> On Sun, Apr 02, 2006 at 11:17:49PM -0400, Tom Lane wrote:
>> I have no objection to doing that, so long as you are actually doing it
>> correctly.  This example shows that each jail must have its own SysV
>> semaphore key space, else information leaks anyway.

> By default SysV shared memory is disallowed in jails.

Hm, the present problem seems to be about semaphores not shared memory
... although I'd not be surprised to find that there's a similar issue
around shared memory.  Anyway, if FBSD's position is that they are
uninterested in supporting SysV IPC in connection with jails, then I
think the Postgres project position has to be that we are uninterested
in supporting Postgres inside FBSD jails.  Sorry Marc :-(

			regards, tom lane