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

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

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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