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Date: Thu, 4 May 2017 15:07:49 +0200
From: Djalal Harouni <>
To: Andy Lutomirski <>
Cc: Kees Cook <>, Andy Lutomirski <>, 
	Linux Kernel Mailing List <>, Andrew Morton <>, 
	"Serge E. Hallyn" <>, 
	"" <>, 
	LSM List <>, 
	Linux API <>, Dongsu Park <>, 
	Casey Schaufler <>, James Morris <>, 
	Paul Moore <>, Tetsuo Handa <>, 
	Greg Kroah-Hartman <>, Jonathan Corbet <>, 
	Jessica Yu <>, Rusty Russell <>, 
	Arnaldo Carvalho de Melo <>, Mauro Carvalho Chehab <>, Ingo Molnar <>, 
	belakhdar abdeldjalil <>, Peter Zijlstra <>, 
	Linus Torvalds <>
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 <> wrote:
> On Sat, Apr 22, 2017 at 1:28 AM, Andy Lutomirski <> 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...



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