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Date: Mon, 22 May 2017 14:08:48 +0200
From: Solar Designer <solar@...nwall.com>
To: Djalal Harouni <tixxdz@...il.com>
Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	kernel-hardening@...ts.openwall.com,
	Andy Lutomirski <luto@...nel.org>,
	Kees Cook <keescook@...omium.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>, 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

Hi Djalal,

Thank you for your work on this!

On Mon, May 22, 2017 at 01:57:03PM +0200, Djalal Harouni wrote:
> *) When modules_autoload_mode is set to (2), automatic module loading is
> disabled for all. Once set, this value can not be changed.

What purpose does this securelevel-like property ("Once set, this value
can not be changed.") serve here?  I think this mode 2 is needed, but
without this extra property, which is bypassable by e.g. explicitly
loaded kernel modules anyway (and that's OK).

I'm sorry if this has been discussed before.

Alexander

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