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From: ASSI <Stromeko@nexgo.de>
To: cygwin@cygwin.com
Subject: Re: cygwin + binutils 2.36 + ASLR/dynamicbase defaults
References: <CAE6_+UewLqP2Tf5FphSqzG21_P-AnXdBjZ+-5-LwJy5n4fXMqg@mail.gmail.com>
 <87zgzo9zpa.fsf@Otto.invalid>
 <CAE6_+UeJNP_iDG+gSDzNHxDFcnC0mBh2Gj4usU=GGzV1=JtEHg@mail.gmail.com>
Date: Sun, 28 Feb 2021 15:03:50 +0100
In-Reply-To: <CAE6_+UeJNP_iDG+gSDzNHxDFcnC0mBh2Gj4usU=GGzV1=JtEHg@mail.gmail.com>
 (Christoph Reiter via Cygwin's message of "Sun, 28 Feb 2021 13:28:08
 +0100")
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Christoph Reiter via Cygwin writes:
> MSYS2 builds all packages with ASLR since 6 months, so things look
> good.

That doesn't tell you all that much since you will have to wait for some
unfavorable address space layout constellation to appear for the problem
to announce itself and then you need someone to recognize the reason and
report it back to you.  I tend to see this only on 32bit on my
development machine where I have a large amount of dependencies
installed.  After a reboot the problem will move somewhere else, which
means that you will need to find another reproducer.

> We've added a patch that allows reverting the base address if needed:
> https://github.com/msys2/MINGW-packages/blob/master/mingw-w64-binutils/2001-ld-option-to-move-default-bases-under-4GB.patch

In other words, that should be the default then since you can't know if
it works otherwise.  Also, I really don't think we should need to change
all toolchains to use these options just in order to produce working
executables.  If "safer" means "it doesn't work", then there are clearly
easier ways to get there.


Regards,
Achim.
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