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Message-ID: <20240706.SieHeiMie8fa@digikod.net>
Date: Sat, 6 Jul 2024 16:56:53 +0200
From: Mickaël Salaün <mic@...ikod.net>
To: Jarkko Sakkinen <jarkko@...nel.org>
Cc: Kees Cook <kees@...nel.org>, Al Viro <viro@...iv.linux.org.uk>,
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linux-security-module@...r.kernel.org
Subject: Re: [RFC PATCH v19 2/5] security: Add new SHOULD_EXEC_CHECK and
SHOULD_EXEC_RESTRICT securebits
On Sat, Jul 06, 2024 at 01:22:06AM +0300, Jarkko Sakkinen wrote:
> On Sat Jul 6, 2024 at 12:44 AM EEST, Kees Cook wrote:
> > > As explained in the UAPI comments, all parent processes need to be
> > > trusted. This meeans that their code is trusted, their seccomp filters
> > > are trusted, and that they are patched, if needed, to check file
> > > executability.
> >
> > But we have launchers that apply arbitrary seccomp policy, e.g. minijail
> > on Chrome OS, or even systemd on regular distros. In theory, this should
> > be handled via other ACLs.
>
> Or a regular web browser? AFAIK seccomp filtering was the tool to make
> secure browser tabs in the first place.
Yes, and that't OK. Web browsers embedded their own seccomp filters and
they are then as trusted as the browser code.
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