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Date: Wed, 4 Jan 2017 12:31:45 -0600
From: Matthew Garrett <>
To: Greg Kroah-Hartman <>
Cc: Kees Cook <>, 
	Linux Kernel Mailing List <>, "Rafael J. Wysocki" <>, 
	Len Brown <>, Pavel Machek <>, Ulf Hansson <>, 
	Mauro Carvalho Chehab <>, Tomeu Vizoso <>, 
	Lukas Wunner <>, Madalin Bucur <>, 
	Sudip Mukherjee <>, Rasmus Villemoes <>, 
	Arnd Bergmann <>, Andrew Morton <>, 
	Russell King <>, Petr Tesarik <>,,
Subject: Re: [PATCH] Allow userspace control of runtime disabling/enabling of
 driver probing

On Wed, Jan 4, 2017 at 12:10 PM, Matthew Garrett <> 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.

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