GNU bug report logs - #42694
26.3; Emacs crashes when linked against newer libx11

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Package: emacs;

Reported by: Leo Prikler <leo.prikler <at> student.tugraz.at>

Date: Mon, 3 Aug 2020 09:33:01 UTC

Severity: normal

Found in version 26.3

Fixed in version 27.1

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

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Report forwarded to bug-gnu-emacs <at> gnu.org:
bug#42694; Package emacs. (Mon, 03 Aug 2020 09:33:01 GMT) Full text and rfc822 format available.
Acknowledgement sent to Leo Prikler <leo.prikler <at> student.tugraz.at>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs <at> gnu.org. (Mon, 03 Aug 2020 09:33:01 GMT) Full text and rfc822 format available.

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

From: Leo Prikler <leo.prikler <at> student.tugraz.at>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.3; Emacs crashes when linked against newer libx11
Date: Mon, 03 Aug 2020 11:31:49 +0200

[Message part 1 (text/plain, inline)]
Two days ago, a patch was sent to Guix updating libx11 to a newer
version in order to fix CVE-2020-14344.  This causes a segmentation
fault in Emacs when trying to start an X window.  After invoking GDB, I
found the offending line to be:

  /* Determine XIC style */
  xic_style = best_xim_style (FRAME_X_XIM_STYLES (f));

For some reason, FRAME_X_XIM_STYLES (f) returns NULL here and
best_xim_style fails when ARRAYELTS is called on it.  I've attached a
patch, that checks for this case.

Regards, 
Leo

[emacs-ignore-empty-xim-styles.patch (text/x-patch, attachment)]
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#42694; Package emacs. (Mon, 03 Aug 2020 14:42:02 GMT) Full text and rfc822 format available.

Message #8 received at 42694 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Leo Prikler <leo.prikler <at> student.tugraz.at>
Cc: 42694 <at> debbugs.gnu.org
Subject: Re: bug#42694: 26.3; Emacs crashes when linked against newer libx11
Date: Mon, 03 Aug 2020 17:40:41 +0300

> From: Leo Prikler <leo.prikler <at> student.tugraz.at>
> Date: Mon, 03 Aug 2020 11:31:49 +0200
> 
> Two days ago, a patch was sent to Guix updating libx11 to a newer
> version in order to fix CVE-2020-14344.  This causes a segmentation
> fault in Emacs when trying to start an X window.  After invoking GDB, I
> found the offending line to be:
> 
>   /* Determine XIC style */
>   xic_style = best_xim_style (FRAME_X_XIM_STYLES (f));
> 
> For some reason, FRAME_X_XIM_STYLES (f) returns NULL here and
> best_xim_style fails when ARRAYELTS is called on it.  I've attached a
> patch, that checks for this case.

Thanks, this is bug#42676, which was solved yesterday.
bug marked as fixed in version 27.1, send any further explanations to 42694 <at> debbugs.gnu.org and Leo Prikler <leo.prikler <at> student.tugraz.at> Request was from Lars Ingebrigtsen <larsi <at> gnus.org> to control <at> debbugs.gnu.org. (Tue, 04 Aug 2020 10:14:02 GMT) Full text and rfc822 format available.
bug archived. Request was from Debbugs Internal Request <help-debbugs <at> gnu.org> to internal_control <at> debbugs.gnu.org. (Tue, 01 Sep 2020 11:24:08 GMT) Full text and rfc822 format available.
This bug report was last modified 3 years and 238 days ago.

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