GNU bug report logs - #20215
25.0.50; Support compilation as PIE

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Philipp Stephani <p.stephani2 <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.0.50; Support compilation as PIE
Date: Fri, 27 Mar 2015 22:42:39 +0100

Currently when trying to compile as a position-independent executable,
e.g.

./configure CFLAGS=-fPIE LDFLAGS=-pie && make

Emacs segfaults when dumping.



In GNU Emacs 25.0.50.1 (x86_64-pc-linux-gnu, GTK+ Version 3.10.8)
 of 2014-12-01 on touchstone.was.corp.google.com, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11501000
System Description:	Ubuntu 14.04 LTS

Configured using:
 `configure --build x86_64-linux-gnu --prefix=/usr
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 --localstatedir=/var/lib --infodir=/usr/share/info
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 --enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/25.0.50/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/25.0.50/site-lisp:/usr/share/emacs/site-lisp
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Message #10 received at 20215 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: Philipp Stephani <p.stephani2 <at> gmail.com>
Cc: 20215 <at> debbugs.gnu.org
Subject: Re: bug#20215: 25.0.50; Support compilation as PIE
Date: Fri, 27 Mar 2015 18:46:00 -0400

> Currently when trying to compile as a position-independent executable,
> e.g.

> ./configure CFLAGS=-fPIE LDFLAGS=-pie && make

> Emacs segfaults when dumping.

I have no idea why it would crash during the dumping process, but
I wouldn't be surprised if after a successful dump of `temacs', the
resulting `emacs' crashes early on, since the dump will be writing
a heap which will probably contain pointers back into the code.


        Stefan

Message #17 received at 20215 <at> debbugs.gnu.org (full text, mbox):

From: Philipp Stephani <p.stephani2 <at> gmail.com>
To: 20215 <at> debbugs.gnu.org
Subject: Re: bug#20215 acknowledged by developer (control message for bug
 #18784)
Date: Fri, 03 Apr 2015 15:33:08 +0000

[Message part 1 (text/plain, inline)]

Could we please de-dupe this bug from the others? This bug is not about
adding -nopie to the Makefile, but about getting Emacs to work with -pie.

[Message part 2 (text/html, inline)]

Message #22 received at 20215 <at> debbugs.gnu.org (full text, mbox):

From: Philipp Stephani <p.stephani2 <at> gmail.com>
To: Philipp Stephani <p.stephani2 <at> gmail.com>, 20215 <at> debbugs.gnu.org
Subject: Re: bug#20215: 25.0.50; Support compilation as PIE
Date: Mon, 13 Apr 2015 23:09:02 +0200

reopen 20215
quit

Reopening this bug because I think it's not a duplicate: we should try
to get PIE compilation working (maybe by rewriting the dumper, as
discussed in the past and apparently done for XEmacs).

Message #27 received at 20215 <at> debbugs.gnu.org (full text, mbox):

From: Philipp Stephani <p.stephani2 <at> gmail.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 20215 <at> debbugs.gnu.org
Subject: Re: bug#20215: 25.0.50; Support compilation as PIE
Date: Sun, 21 Jun 2015 20:11:16 +0000

[Message part 1 (text/plain, inline)]

Stefan Monnier <monnier <at> iro.umontreal.ca> schrieb am Fr., 27. März 2015 um
23:46 Uhr:

> > Currently when trying to compile as a position-independent executable,
> > e.g.
>
> > ./configure CFLAGS=-fPIE LDFLAGS=-pie && make
>
> > Emacs segfaults when dumping.
>
> I have no idea why it would crash during the dumping process, but
> I wouldn't be surprised if after a successful dump of `temacs', the
> resulting `emacs' crashes early on, since the dump will be writing
> a heap which will probably contain pointers back into the code.
>
>
>
I haven't investigated why it crashes in detail, but since the dumper
prevents ASLR and PIE (and doesn't work on platforms such as Chromium), I
think it should be replaced by a portable dumper.

[Message part 2 (text/html, inline)]

Message #30 received at 20215 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Philipp Stephani <p.stephani2 <at> gmail.com>
Cc: 20215 <at> debbugs.gnu.org
Subject: Re: bug#20215: 25.0.50; Support compilation as PIE
Date: Mon, 22 Jun 2015 11:58:50 -0400

> ... it should be replaced by a portable dumper.

I think we all agree.


        Stefan "who also thinks that depending on the specifics of such
                a «portable» dumper, it may still break in the presence
                ASLR and friends"

Message #37 received at 20215-done <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: 20215-done <at> debbugs.gnu.org
Subject: Re: bug#20215: 25.0.50; Support compilation as PIE
Date: Thu, 05 Sep 2019 18:00:26 -0400

Version: 27.1

>> ... it should be replaced by a portable dumper.

And lo, it was.

Compiling with -fPIE seems to work with the portable dumper that will be
the default for Emacs 27.1 onwards.

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