From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Wilfred Hughes <me@wilfred.me.uk>
Cc: 32495@debbugs.gnu.org
Subject: bug#32495: 26.1; Arbitrary code execution when completing inside untrusted elisp code
Date: Thu, 23 Aug 2018 14:54:31 -0400 [thread overview]
Message-ID: <jwvefeoudlu.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <CAFXAjY7CEXsZfH_RNA8QjDYm7ynJtuCbBZOeSVATcA6rNw+qpQ@mail.gmail.com> (Wilfred Hughes's message of "Wed, 22 Aug 2018 01:11:55 +0100")
> 1. pass in an environment with all untrusted macros replaced with dummies:
Sounds like a good first step.
We could even start with a blacklist rather than a whitelist
(eval-when-compile, eval-and-compile, cl-eval-when, ...), so the point
would be to protect oneself from accidental problems rather than from
malign adversaries.
> 2. bind all eval-capable functions first (INCOMPLETE, there are other
> eval-capable functions, such as load):
Trying to plug each and every hole sounds like a losing game
(e.g. you can implement `eval` by building a `(lambda () ,exp) and then
causing it to be called one way or another).
Ideally, we'd have some way to confine Elisp code to a sandbox of some
sort (e.g. no access to any I/O and all changes to global vars are ignored).
Stefan
prev parent reply other threads:[~2018-08-23 18:54 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-22 0:11 bug#32495: 26.1; Arbitrary code execution when completing inside untrusted elisp code Wilfred Hughes
2018-08-23 18:54 ` Stefan Monnier [this message]
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