Horton

Re: OK, so culicidae is *still* broken

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andres Freund <andres@anarazel.de>
Cc: pgsql-hackers@postgresql.org
Date: 2017-04-15T21:34:06Z
Lists: pgsql-hackers 
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

Commits

  1. Provide a way to control SysV shmem attach address in EXEC_BACKEND builds.

  2. Disable RandomizedBaseAddress on MSVC builds