GNU bug report logs - #30193
crash in libotf

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Glenn Morris <rgm <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#30193: closed (crash in libotf)
Date: Fri, 02 Feb 2018 17:01:02 +0000

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Your message dated Fri, 02 Feb 2018 11:47:08 -0500
with message-id <ncshajwd83.fsf <at> fencepost.gnu.org>
and subject line Re: bug#30193: crash in libotf
has caused the debbugs.gnu.org bug report #30193,
regarding crash in libotf
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


-- 
30193: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=30193
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From: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
To: bug-gnu-emacs <at> gnu.org
Subject: The deadliest file in Emacs history
Date: Sun, 21 Jan 2018 17:54:25 +0800

Gentleman, I reveal to you the deadliest file in the history
of Emacs.

It is so deadly that it must be QP encoded, else, well,

Fatal error 11: Segmentation fault
Backtrace:
emacs[0x50a5fe]...
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11fb0)[0x7fc827b75fb0]
/usr/lib/x86_64-linux-gnu/libotf.so.0(OTF_drive_gpos_with_log+0x2a)[0x7fc828527a2a]
/usr/lib/x86_64-linux-gnu/libm17n-flt.so.0(+0x24f2)[0x7fc8280e04f2]...

It is so deadly that once restored from QP, only emacs -nw can safely open it.

If you use X-windows, even doing "! cat"
(! runs the command dired-do-shell-command)
or just plain
$ emacs DEATH
will crash your emacs.
No matter if you do
# su - nobody
or even LC_ALL=C emacs ...
for the cleanest environment.

Oh yeah, here it is.

$ cat DEATH.qp
=E0=B2=B9=E0=B3=86=E0=B2=9A=E0=B3=8D=E0=B2=9A=E0=B3=81

It is so deadly that even in M-x shell,
just doing
$ qprint -d DEATH.qp
will fry your emacs.

emacs-version "25.2.2"
Debian emacs25 25.2+1-6

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From: Glenn Morris <rgm <at> gnu.org>
To: 30193-done <at> debbugs.gnu.org
Subject: Re: bug#30193: crash in libotf
Date: Fri, 02 Feb 2018 11:47:08 -0500

To summarize:
This is an issue in the libotf library that Emacs uses.
It will be fixed in a future libotf release.
In the meantime, it can be worked around in Emacs by adding
"Noto Serif Kannada" to face-ignored-fonts.

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