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Revert "usb: interface authorization: Documentation part"

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This reverts commit 6ef2bf7176 as the
signed-off-by address is invalid.

Cc: Stefan Koch <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Greg Kroah-Hartman 2015-08-18 09:57:15 -07:00
commit dba3398381
2 changed files with 0 additions and 56 deletions
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34
Documentation/usb/authorization.txt
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@ -3,9 +3,6 @@ Authorizing (or not) your USB devices to connect to the system
(C) 2007 Inaky Perez-Gonzalez <[email protected]> Intel Corporation
Interface authorization part:
(C) 2015 Stefan Koch <[email protected]> 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.