On Thu, May 31, 2012 at 2:19 PM, Theo de Raadt <[email protected]> wrote:
>> It is a very nice feature that FreeBSD 9 loads ugen along
>> with uhid for generic USB HID device like my Microchip
>> PICKit 2. With that, I can use libusb based program on
>> generic HID device without the need to do anything.
>
> Yeah, and with that userland application which is given access to
> "share" the device, it can now race changes in the device registers,
> and thus mess up the kernel device driver, and trigger a bug in the
> kernel.
>
> Very smart.
>
> Unless kernel device drivers are written very carefully.
>
> Which they never are, anywhere.

I am not an expert in FreeBSD myself but I can relay the message
to HPS and he may give you the answer.

-- 
Xiaofan

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