linux-kernel - Re: [RFC] Capabilities still can't be inherited by normal programs

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Message-ID: <CAGXu5jJ0S+rJ9+LsMzoDYmAUZjGU-NuN1Y0DwHN_MatbXG02jg@mail.gmail.com>
Date:	Mon, 10 Dec 2012 12:17:17 -0800
From:	Kees Cook <keescook@...omium.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Casey Schaufler <casey@...aufler-ca.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	"Andrew G. Morgan" <morgan@...nel.org>,
	"Serge E. Hallyn" <serge@...lyn.com>, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	James Morris <james.l.morris@...cle.com>,
	Eric Paris <eparis@...hat.com>,
	"Serge E. Hallyn" <serge@...onical.com>,
	Markku Savela <msa@...h.iki.fi>
Subject: Re: [RFC] Capabilities still can't be inherited by normal programs

On Mon, Dec 10, 2012 at 11:55 AM, Andy Lutomirski <luto@...capital.net> wrote:
> Write a daemon.  Rig up wrappers for each setuid program to instead
> call into that daemon and have that daemon invoke the privileged
> program on behalf of the caller, with a sanitized environment.  Be
> annoyed by a few items on the "linux plumber's wish list" that make
> this rather difficult right now.

FWIW, this is something we'd like to do in Chrome OS. Dealing with
fs-attrs has traditionally been a pain, so this kind of simple passing
down of privilege would be much nicer. It means we'd have a
programmatic way to decide what privs a helper has, rather than having
to represent it in some way on-disk.

-Kees

-- 
Kees Cook
Chrome OS Security
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