linux-kernel - Re: [PATCH] Allow userspace control of runtime disabling/enabling of driver probing

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Message-ID: <CAPeXnHue8hKFiMsddMTN7Hb5RWBGXWUgy2-kpXNLwBfOdf0QVA@mail.gmail.com>
Date:   Wed, 4 Jan 2017 12:31:45 -0600
From:   Matthew Garrett <mjg59@...eos.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Lukas Wunner <lukas@...ner.de>,
        Madalin Bucur <madalin.bucur@....com>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Arnd Bergmann <arnd@...db.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Russell King <rmk+kernel@....linux.org.uk>,
        Petr Tesarik <ptesarik@...e.com>, linux-pm@...r.kernel.org,
        kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH] Allow userspace control of runtime disabling/enabling of
 driver probing

On Wed, Jan 4, 2017 at 12:10 PM, Matthew Garrett <mjg59@...eos.com> wrote:
>
> The USB authentication feature was intended for handling wireless USB
> devices - it can be reused for this, but the code isn't generic enough
> to apply to other bus types. The two interact in exactly the way you'd
> expect, ie they don't. If you use both, then you need to handle both.

And as an example of why the USB authorisation feature isn't
sufficient - the interface configuration isn't picked until after
you've authorised the device, which means you can't necessarily tell
the difference between a keyboard and an ethernet adapter until after
you've authorised it. That defeats the object, but it can't be changed
without breaking the wireless USB case.