linux-kernel - Re: [PATCH v3 1/2] modules:capabilities: automatic module loading restriction

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Message-ID: <CALCETrWzjCWGJ2-ghQBie1AXLgFqGe-B9DALUASm43gDO5RRcw@mail.gmail.com>
Date:   Wed, 19 Apr 2017 16:16:22 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     Djalal Harouni <tixxdz@...il.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Kees Cook <keescook@...omium.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>, zendyani@...il.com,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v3 1/2] modules:capabilities: automatic module loading restriction

On Wed, Apr 19, 2017 at 3:20 PM, Djalal Harouni <tixxdz@...il.com> wrote:
> Currently, an explicit call to load or unload kernel modules require
> CAP_SYS_MODULE capability. However unprivileged users have always been
> able to load some modules using the implicit auto-load operation. An
> automatic module loading happens when programs request a kernel feature
> from a module that is not loaded. In order to satisfy userspace, the
> kernel then automatically load all these required modules.

I like this feature.

--Andy