Re: USB vulnerability

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On Fri, 29 Jul 2016, Felipe Balbi wrote:

> Hi,
> 
> Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> writes:
> > On Fri, 29 Jul 2016, Felipe Balbi wrote:
> >
> >> slightly unrelated, but...
> >
> >> > -		maxp = usb_endpoint_maxp(&endpoint->desc) & 0x07ff;
> >> 
> >> usb_endpoint_maxp() should probably be updated to return only maximum
> >> packet size. Then we would need to introduce usb_endpoint_mult() or
> >> something along those lines to take care of the other valid bits.
> >
> > Yes, I thought of that too.  I didn't want to do it right now because
> > it would mean auditing all the host controller drivers (and perhaps
> > checking the device drivers as well).  Still, it is a good idea.
> 
> I have had that in my TODO queue for a few weeks, actually. I need to
> look at it because of some requirement I found on DWC3 which we're not
> always guaranteeing.
> 
> I could do the same thing XHCI did and have its own wrappers, but it's
> best to fix this once and for all.

I'll be happy to review your work when it's ready.

Alan Stern

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