Johan Verrept wrote:
> Thomas Sailer wrote:
> > Many USB devices can be crashed by sending an inappropriate control
> > request even if it is only a read request. That's why write perms
> > are required even for read requests.
> Which is a usb spec violation ?
Yes but apparently not many vendors care
> I see what you mean though. We actually have two flags for three levels of
> access.
> o read stored descriptors
> o full read (real reads to the device)
> o full read/write
Correct.
> Which descriptors are stored ? all of them ?
In the past it was only the device descriptor, but thanks to
JE's patch the config descriptors are now stored too AFAIK.
> By reading descriptors you cannot change the configuration of the device, so
> it can be given to every user. (depending on the r flags off course).
Yes but even this may crash some devices
Tom
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