GNU bug report logs - #11442
dbus uses Emacs integer as pointer, possible core dump

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Paul Eggert <eggert <at> cs.ucla.edu>
Subject: bug#11442: closed (Re: bug#11442: dbus uses Emacs integer as
 pointer, possible core dump)
Date: Wed, 09 May 2012 21:39:01 +0000

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Your bug report

#11442: dbus uses Emacs integer as pointer, possible core dump

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 11442 <at> debbugs.gnu.org.

-- 
11442: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=11442
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: Andreas Schwab <schwab <at> linux-m68k.org>, 11442-done <at> debbugs.gnu.org
Subject: Re: bug#11442: dbus uses Emacs integer as pointer, possible core dump
Date: Wed, 09 May 2012 14:35:47 -0700

On 05/09/2012 02:19 PM, Michael Albinus wrote:
> I've converted it to be an internal Lisp object.

Thanks; that looks good.  Closing the bug.

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: bug-gnu-emacs <at> gnu.org
Cc: Michael Albinus <michael.albinus <at> gmx.de>
Subject: dbus uses Emacs integer as pointer, possible core dump
Date: Wed, 09 May 2012 08:20:57 -0700

The trunk version of Emacs src/dbusbind.c contains a function
xd_get_connection_address that does this:

    connection = (DBusConnection *) (intptr_t) XFASTINT (val);

This converts an Emacs integer to a pointer without checking
that it is actually of the proper C type.  It is possible
for Lisp code to mistakenly put an integer there that will
cause Emacs to dump core.  Shouldn't this be made safe, so
that Lisp code can't do that?  For example, a DbusConnection *
could be made a proper Lisp pseudovector or misc type or
something like that.  The idea is to avoid a bad pointer
leaking into the C code.

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