David Brownell wrote:
> In any case, it doesn't sound like the stuff you mentioned building
> on top of it could address the basic problem: "read" mode permissions
> only seems to give permission to access a cached device descriptor.
> None of the other standard read-only device operations can be done.
All actions that lead to a transaction on the USB bus require
write access, on purpose. Otherwise, given buggy devices
(which exist), any user could kill that device,
and if it was eg. a block device, bad things would happen.
> That problem is easy enough to patch, though one needs to be careful
> of course. I can start on it next week.
Please don't.
The idea is to have a user space daemon which selectively
(and configurably by the user) adjusts permissions.
This is policy and IMO belongs into userspace.
> Did you choose an approach for libusb yet? Do they really both work?
Yes, at least with usbstress, usb.in.tum.de
Tom
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