diff options
Diffstat (limited to 'Documentation/usb')
| -rw-r--r-- | Documentation/usb/authorization.txt | 34 |
1 files changed, 0 insertions, 34 deletions
diff --git a/Documentation/usb/authorization.txt b/Documentation/usb/authorization.txt index 020cec5585ce..c069b6884c77 100644 --- a/Documentation/usb/authorization.txt +++ b/Documentation/usb/authorization.txt @@ -3,9 +3,6 @@ Authorizing (or not) your USB devices to connect to the system (C) 2007 Inaky Perez-Gonzalez <inaky@linux.intel.com> Intel Corporation -Interface authorization part: - (C) 2015 Stefan Koch <skoch@suse.de> SUSE LLC - This feature allows you to control if a USB device can be used (or not) in a system. This feature will allow you to implement a lock-down of USB devices, fully controlled by user space. @@ -93,34 +90,3 @@ etc, but you get the idea. Anybody with access to a device gadget kit can fake descriptors and device info. Don't trust that. You are welcome. - -Interface authorization ------------------------ -There is a similar approach to allow or deny specific USB interfaces. -That allows to block only a subset of an USB device. - -Authorize an interface: -$ echo 1 > /sys/bus/usb/devices/INTERFACE/authorized - -Deauthorize an interface: -$ echo 0 > /sys/bus/usb/devices/INTERFACE/authorized - -The default value for new interfaces -on a particular USB bus can be changed, too. - -Allow interfaces per default: -$ echo 1 > /sys/bus/usb/devices/usbX/interface_authorized_default - -Deny interfaces per default: -$ echo 0 > /sys/bus/usb/devices/usbX/interface_authorized_default - -Per default the interface_authorized_default bit is 1. -So all interfaces would authorized per default. - -Note: -If a deauthorized interface will be authorized so the driver probing must -be triggered manually by writing INTERFACE to /sys/bus/usb/drivers_probe - -For drivers that need multiple interfaces all needed interfaces should be -authroized first. After that the drivers should be probed. -This avoids side effects. |