Re: address@hidden: Emacs security bug]

[Chong Yidong]

Eli Zaretskii <address@hidden> writes:

> From: "Morten Welinder" <address@hidden>
>
> 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)?