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From: Philipp
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Subject: bug#45198: 28.0.50; Sandbox mode
Date: Mon, 5 Jul 2021 21:12:39 +0200
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To: Stefan Monnier
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Archived-At:
> Am 18.04.2021 um 16:25 schrieb Stefan Monnier =
:
>=20
>>> The whole point of the sandboxing exercise is so as to be able to =
have
>>> flymake-mode in the hook without exposing yourself to
>>> these vulnerabilities.
>>=20
>> So we are going to introduce all this non-trivial machinery into =
Emacs
>> just to solve the Flymake use case? Is that reasonable from the
>> project management POV, in your eyes?
>=20
> To the extent that this machinery will only be used by those rare =
places
> that need it (e.g. flymake), yes, as long as the low-level interface
> (e.g. the code that added the support for the `--seccomp` argument) is
> simple enough.
>=20
> BTW, in the context of GNU/Linux, an alternative to `--seccomp` is to
> require the `bwrap` tool (that's what I use in the `elpa-admin.el`
> scripts to run makefile rules from ELPA packages).
>=20
I wouldn't call it an alternative, they are rather complementary =
approaches, and I think we should require both for a sandbox that we =
consider "hard enough". The --seccomp flag doesn't set up namespaces; =
that's rather subtle and best done out-of-process by a dedicated tool =
like bwrap. On the other hand, setting up a seccomp filter =
out-of-process has the disadvantage that it needs to allow execve, =
thereby increasing the attack surface quite a bit. The sandboxing I'd =
have in mind would be a combination of bwrap (with namespaces and a =
seccomp filter that allows execve) and Emacs's own seccomp filter =
(banning execve).=