Re: [mwelinder@gmail.com: Emacs security bug]

[Eli Zaretskii <eliz@gnu.org>]

> From: Chong Yidong <cyd@stupidchicken.com>
> Cc: Eli Zaretskii <eliz@gnu.org>, emacs-devel@gnu.org
> Date: Sat, 10 May 2008 10:50:17 -0400
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > From: "Morten Welinder" <mwelinder@gmail.com>
> >
> > 1. Create .emacs with contents
> >     (global-font-lock-mode t)
> >     (seq font-lock-support-mode 'fast-lock-mode)
> >
> > 2. Create foo.c with contents /* Nothing to see here */
> >
> > 3. Create foo.c.flc with contents (message "Something to see here!")
> >
> > 4. Start Emacs and load foo.c
> >
> > - --> Observe that code from foo.c.flc is run.  Not good.
> > (This is with Emacs 21.3.1; XEmacs is also affected, although step 1 needs to
> > be adjusted.)
> >
> > Suggestions:
> >
> > a. Remove "." from fast-lock-cache-directories.  Littering little
> > files everywhere is not a good idea anyway.
> >
> > b. Don't use load to handle the .flc file.  Instead read it into a
> > buffer and read one s-expression at a time and verify that it is sane
> > before evaluating it.
> 
> Simon, could you take a look at this (you're listed as the author of
> fast-lock.el)?

Please keep Morten on the CC list of this thread.  I don't want to
have to forward messages back and forth forever.