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Message-ID: <CAGXu5jJ-zpqU9v44=bc0GnQP5zcKtceR_7DBQVBZ=vy3OvNx9w@mail.gmail.com>
Date: Tue, 23 May 2017 11:36:36 -0700
From: Kees Cook <keescook@...gle.com>
To: Solar Designer <solar@...nwall.com>
Cc: Djalal Harouni <tixxdz@...il.com>, linux-kernel <linux-kernel@...r.kernel.org>,
Network Development <netdev@...r.kernel.org>, LSM List <linux-security-module@...r.kernel.org>,
"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>, Andy Lutomirski <luto@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>, Rusty Russell <rusty@...tcorp.com.au>,
"Serge E. Hallyn" <serge@...lyn.com>, Jessica Yu <jeyu@...hat.com>,
"David S. Miller" <davem@...emloft.net>, James Morris <james.l.morris@...cle.com>,
Paul Moore <paul@...l-moore.com>, Stephen Smalley <sds@...ho.nsa.gov>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>, Ingo Molnar <mingo@...nel.org>,
Linux API <linux-api@...r.kernel.org>, Dongsu Park <dpark@...teo.net>,
Casey Schaufler <casey@...aufler-ca.com>, Jonathan Corbet <corbet@....net>,
Arnaldo Carvalho de Melo <acme@...hat.com>, Mauro Carvalho Chehab <mchehab@...nel.org>,
Peter Zijlstra <peterz@...radead.org>, Zendyani <zendyani@...il.com>,
"open list:DOCUMENTATION" <linux-doc@...r.kernel.org>, Al Viro <viro@...iv.linux.org.uk>,
Ben Hutchings <ben.hutchings@...ethink.co.uk>
Subject: Re: [PATCH v4 next 0/3] modules: automatic module
loading restrictions
On Tue, May 23, 2017 at 12:48 AM, Solar Designer <solar@...nwall.com> wrote:
> For modules_autoload_mode=2, we already seem to have the equivalent of
> modprobe=/bin/true (or does it differ subtly, maybe in return values?),
> which I already use at startup on a GPU box like this (preloading
> modules so that the OpenCL backends wouldn't need the autoloading):
>
> nvidia-smi
> nvidia-modprobe -u -c=0
> #modprobe nvidia_uvm
> #modprobe fglrx
>
> sysctl -w kernel.modprobe=/bin/true
> sysctl -w kernel.hotplug=/bin/true
>
> but it's good to also have this supported more explicitly and more
> consistently through modules_autoload_mode=2 while we're at it. So I
> support having this mode as well. I just question the need to have it
> non-resettable.
I agree it's useful to have the explicit =2 state just to avoid
confusion when more systems start implementing
CONFIG_STATIC_USERMODEHELPER and kernel.modprobe becomes read-only
(though the userspace implementation may allow for some way to disable
it, etc). I just like avoiding the upcall to modprobe at all.
-Kees
--
Kees Cook
Pixel Security
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