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Date: Wed, 4 Jan 2017 10:13:12 +0100
From: Greg Kroah-Hartman <>
To: Kees Cook <>
Cc:, Matthew Garrett <>,
Subject: Re: [PATCH] Allow userspace to request device probing even if
 defer_all_probes is true

On Tue, Jan 03, 2017 at 03:07:20PM -0800, Kees Cook wrote:
> From: Matthew Garrett <>
> Userspace may wish to make a policy decision to allow certain devices
> to be attached, such as keyboards.

I don't understand what that sentance means.  Why wouldn't keyboards be

> Add a force_probe sysfs node to each device, which if written will
> trigger a probe even if defer_all_probes is currently true.

Why not just manually trigger the bind of the device?  I don't
understand the problem here that is being addressed, nor do I understand
how this would be used.  More explaination please.


greg k-h

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