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Date: Thu, 4 May 2017 15:07:49 +0200
From: Djalal Harouni <tixxdz@...il.com>
To: Andy Lutomirski <luto@...capital.net>
Cc: Kees Cook <keescook@...omium.org>, Andy Lutomirski <luto@...nel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org>,
"Serge E. Hallyn" <serge@...lyn.com>,
"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>,
LSM List <linux-security-module@...r.kernel.org>,
Linux API <linux-api@...r.kernel.org>, Dongsu Park <dpark@...teo.net>,
Casey Schaufler <casey@...aufler-ca.com>, James Morris <james.l.morris@...cle.com>,
Paul Moore <paul@...l-moore.com>, Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Jonathan Corbet <corbet@....net>,
Jessica Yu <jeyu@...hat.com>, Rusty Russell <rusty@...tcorp.com.au>,
Arnaldo Carvalho de Melo <acme@...hat.com>, Mauro Carvalho Chehab <mchehab@...nel.org>, Ingo Molnar <mingo@...nel.org>,
belakhdar abdeldjalil <zendyani@...il.com>, Peter Zijlstra <peterz@...radead.org>,
Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v3 2/2] modules:capabilities: add a per-task modules
autoload restriction
On Sat, Apr 22, 2017 at 2:17 PM, Djalal Harouni <tixxdz@...il.com> wrote:
> On Sat, Apr 22, 2017 at 1:28 AM, Andy Lutomirski <luto@...capital.net> wrote:
[...]
>>
>> My point is that all of these need some way to handle configuration
>> and inheritance, and I don't think that a bunch of per-task prctls is
>> the right way. As just an example, saying that interactive users can
>> autoload modules but other users can't, or that certain systemd
>> services can, etc, might be nice. Linus already complained that he
>> (i.e. user "torvalds" or whatever) should be able to profile the
>> kernel but that other uids should not be able to.
>
> Neat, maybe this could already be achieved with this interface and
> systemd-logind, "ModulesAutoloadUsers=andy" in logind.conf where
> "andy" is the only logged-in user able to trigger and autoload kernel
> modules. However maybe we should not restrict too much other bits or
> functionality of the other users, please let me will follow up later
> on it.
>
>> I personally like my implicit_rights idea, and it might be interesting
>> to prototype it.
>
Andy following on the idea of per user settings, I'm curious did you
manage to make some advance on how to store the user settings ? the
user database format is old and not extensible, there was cgmanager or
other libcgroup but for resources, and no simple thing for such
restrictions example: "RestrictLinuxModules=user" that will prevent
such users from making/loading extra Linux features/modules that are
not already available...
Thanks!
--
tixxdz
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