GNU bug report logs - #33174
27.0.50; Dump fails on GNU/Linux ppc64le

Previous Next

Full log

Message #52 received at 33174-done <at> debbugs.gnu.org (full text, mbox):

From: Thomas Fitzsimmons <fitzsim <at> fitzsim.org>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: 33174-done <at> debbugs.gnu.org
Subject: Re: bug#33174: 27.0.50; Dump fails on GNU/Linux ppc64le
Date: Mon, 12 Nov 2018 21:29:03 -0500

Paul Eggert <eggert <at> cs.ucla.edu> writes:

> Thomas Fitzsimmons wrote:
>> Actually, EMACS_HEAP_EXEC is true!
>
> OK, thanks, that explains things. I installed the first attached patch
> to the emacs-26 branch as a quick hack to work around the problem,

I confirmed this works around the problem on the emacs-26 branch with
EMACS_HEAP_EXEC set in the initial build environment, and confirmed that
the build still works without it set.

> and the second attached patch to the master branch to come up with a
> better way to address the underlying issue that doesn't involve
> fiddling with environment variables. Please let us know if this
> doesn't work for your platform, as I've tested this only on x86-64.

Likewise this fixes the failure on master on my system with
EMACS_HEAP_EXEC set, and the build still works without it set.

It looks like the second patch still disables ASLR unconditionally on
PPC64.  If you want to suggest experiments I can try on my system, maybe
I can attempt a fix so that ASLR can be disabled only during dumping on
PPC64 like on other archiectures.  Or do you know that's an
impossibility for some reason?

Thanks,
Thomas

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.