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Date: Fri, 8 Aug 2014 07:00:13 -0700
From: Greg KH <>
Subject: Re: BadUSB discussion

On Fri, Aug 08, 2014 at 09:56:34AM -0400, Daniel Kahn Gillmor wrote:
> For example, you could register keyboards by serial number with the
> system,

Most USB keyboards in the system do not have a unique serial number.
Heck, most USB devices in the system do not have a unique serial number,
the only USB device that is required to do so is a USB printer,
everything else is free to not have one at all, or have the same serial
number for all devices made of that type.

Never treat a USB serial number as "unique", except for a USB printer,

greg k-h

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