On Tue, Dec 05, 2017 at 10:09:35PM +0000, andy_purcell@xxxxxxxxxxxx wrote: > I have implemented a USB device using functionfs. > A colleague now says our app must run as a normal user, not as root. > > I tried it and it does not work. > The problem is this - the endpoint files created by the OS are owned by root. > These ep files are created after I write the descriptors and strings to the /dev/usbffs/ep0 file. > > $ ls -l /dev/usbffs/ > total 0 > -rw-rw-rw- 1 xyzuser xyzgrp 0 Dec 5 21:36 ep0 > -rw------- 1 root root 0 Dec 5 21:39 ep1 > -rw------- 1 root root 0 Dec 5 21:39 ep2 > -rw------- 1 root root 0 Dec 5 21:39 ep3 > > A normal user-space app cannot open, write, read, these ep files. > > Is there a remedy for this? Write a udev rule to change the owners of those files :) You must have done that already for the ep0 file, right? thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
