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

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Date:   Wed, 4 Jan 2017 20:47:07 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Matthew Garrett <mjg59@...eos.com>
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 04, 2017 at 12:31:45PM -0600, Matthew Garrett wrote:
> 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.

You know the device type and vendor/product id before you authorize it,
you should be able to do this type of detection otherwise it seems
pretty pointless :)

> That defeats the object, but it can't be changed without breaking the
> wireless USB case.

No one has wireless USB devices, this all works the same for any USB
device :)

thanks,

greg k-h