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Date: Wed, 4 Mar 2020 22:11:04 +0300
From: Andrey Repin <anrdaemon AT yandex DOT ru>
Reply-To: cygwin AT cygwin DOT com
Message-ID: <1751741634.20200304221104@yandex.ru>
To: John Selbie <jselbie AT gmail DOT com>, cygwin AT cygwin DOT com
Subject: Re: ASLR revisited
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Greetings, John Selbie!

> For my open source project, I publish source code for Unix written in C++.
> And as a convenience, I publish Win32 binaries compiled with Cygwin's g++
> build. I bundled the compiled EXE along with the dependent Cygwin DLLs
> (cygcrypto, cyggcc, cycstdc++, cygwin1, and cygz.dll).

> Someone rang me up today and said, "We're about to go live with your
> pre-compiled binaries for Windows, but our compliance testing detected your
> code isn't using ASLR (Address Space Layout Randomization).  Can you fix?"

> A quick internet search reveals that Cygwin has a compatibility issue with
> ASRL. Process Explorer from sysinternals.com reveals that the process runs
> without ASLR.

As far as I recall, POSIX forking semantics are incompatible with ASLR.
So, if my memory serves me well, the answer is "don't do that, your
application will break badly."

> Is there a workaround for allowing Cygwin code to have ASLR?  I don't need
> the fork() function.

Build your application for native API. That's the only right answer.


-- 
With best regards,
Andrey Repin
Wednesday, March 4, 2020 22:09:21

Sorry for my terrible english...


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