linux-kernel - Re: [RFC PATCH v19 2/5] security: Add new SHOULD_EXEC_CHECK and SHOULD_EXEC

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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>, 
	Christian Brauner <brauner@...nel.org>, Linus Torvalds <torvalds@...ux-foundation.org>, 
	Paul Moore <paul@...l-moore.com>, Theodore Ts'o <tytso@....edu>, 
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	Dmitry Vyukov <dvyukov@...gle.com>, Eric Biggers <ebiggers@...nel.org>, 
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	Thibaut Sautereau <thibaut.sautereau@....gouv.fr>, Vincent Strubel <vincent.strubel@....gouv.fr>, 
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	linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org, 
	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.