linux-kernel - Re: [kernel-hardening] [PATCH v4 next 0/3] modules: automatic module loading restrictions

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Date:   Mon, 22 May 2017 16:52:15 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Djalal Harouni <tixxdz@...il.com>,
        Solar Designer <solar@...nwall.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>,
        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: [kernel-hardening] [PATCH v4 next 0/3] modules: automatic module
 loading restrictions

On Mon, May 22, 2017 at 4:38 PM, Andy Lutomirski <luto@...nel.org> wrote:
> I think that having the un-resettable mode is unnecessary.  We should
> have option that disables loading modules entirely and cannot be
> unset.  (That means no explicit loads and not implicit loads.)  Maybe
> we already have this.  Otherwise, tightening caps needed for implicit
> loads should just be a normal yes/no setting IMO.

Yup, /proc/sys/kernel/modules_disabled already does this.

-- 
Kees Cook
Pixel Security