From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andres Freund <andres@anarazel.de>
cc: pgsql-hackers@postgresql.org
Subject: Re: OK, so culicidae is *still* broken
In-reply-to: <20170415213017.co7gkjlbcy44zlmw@alap3.anarazel.de>
References: <7036.1492231361@sss.pgh.pa.us>
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 <20170415210643.cdapwhwmbiwaqd6e@alap3.anarazel.de>
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Comments: In-reply-to Andres Freund <andres@anarazel.de>
	message dated "Sat, 15 Apr 2017 14:30:18 -0700"
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Date: Sat, 15 Apr 2017 17:34:06 -0400
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Andres Freund <andres@anarazel.de> writes:
> On 2017-04-15 17:24:54 -0400, Tom Lane wrote:
>> I wonder whether we could work around that by just destroying the created
>> process and trying again if we get a collision.  It'd be a tad
>> inefficient, but hopefully collisions wouldn't happen often enough to be a
>> big problem.

> That might work, although it's obviously not pretty.  We could also just
> default to some out-of-the-way address for MapViewOfFileEx, that might
> also work.

Could be.  Does Microsoft publish any documentation about the range of
addresses their ASLR uses?

Obviously, any such fix would be a lot more likely to be reliable in
64-bit machines.  There's probably not enough daylight to be sure of
making it work in 32-bit Windows, so I suspect we'd need some retry
logic anyway for that case.

			regards, tom lane


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