[Bug 288964] Re: sudo does not work with unbinding usb interface from usbhid driver

[ALinuxUser]

I am sorry to necrobump, but I don't get it.

$ sudo echo -n '2-3' | tee -a /sys/bus/usb/drivers/usb/unbind

Produces, on my system, this: 'tee: unbind: Permission denied'.
Similarly if I have used 'su' to obtain root:

# echo -n '2-3' | tee -a /sys/bus/usb/drivers/usb/unbind
2-3tee: /sys/bus/usb/drivers/usb/unbind: No such device
# ls /sys/bus/usb/drivers/usb
1-1  1-1.2  1-1.6  2-1  bind  uevent  unbind  usb1  usb2  usb3  usb4

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Title:
  sudo does not work with unbinding usb interface from usbhid driver

Status in sudo package in Ubuntu:
  Invalid

Bug description:
  I was looking for a way to dump the HID report descriptor under Linux.
  For that purpose, I need to detach the kernel usbhid driver from the
  HID interfaces.

  More detail in libusb mailing list archive.
  http://www.nabble.com/How-to-dump-HID-report-descriptor-under-Linux-td19609562.html

  mcuee at Ubuntu804:~$ uname -a
  Linux Ubuntu804 2.6.24-21-generic #1 SMP Mon Aug 25 17:32:09 UTC 2008 i686 GNU/Linux

  mcuee at Ubuntu804:/sys/bus/usb/drivers/usbhid$ lsusb
  Bus 001 Device 007: ID 04f2:0760 Chicony Electronics Co., Ltd
  Bus 001 Device 006: ID ffff:0005
  Bus 001 Device 005: ID 046d:c054 Logitech, Inc.
  Bus 001 Device 004: ID 14c0:0008
  Bus 001 Device 003: ID 1947:0033
  Bus 001 Device 002: ID 058f:9360 Alcor Micro Corp. 8-in-1 Media Card Reader
  Bus 001 Device 001: ID 0000:0000
  Bus 002 Device 001: ID 0000:0000

  mcuee at Ubuntu804:/sys/bus/usb/drivers/usbhid$ ls
  1-3:1.0  1-5:1.0  1-7:1.0  1-7:1.1  bind  module  new_id  uevent  unbind

  So far so good. But then there is error thereafter. Maybe this is a Ubuntu
  specific problem.

  mcuee at Ubuntu804:/sys/bus/usb/drivers/usbhid$ sudo echo -n 1-7:1.0 >unbind
  bash: unbind: Permission denied
  mcuee at Ubuntu804:/sys/bus/usb/drivers/usbhid$ sudo echo -n 1-7:1.1 >unbind
  bash: unbind: Permission denied 

  It turns out that I need to enable root to be able to do the job.
  mcuee at Ubuntu804:/sys/bus/usb/drivers/usbhid$ sudo passwd root
  [sudo] password for mcuee:
  Enter new UNIX password:
  Retype new UNIX password:
  passwd: password updated successfully
  mcuee at Ubuntu804:/sys/bus/usb/drivers/usbhid$ ls
  1-3:1.0  1-5:1.0  1-7:1.0  1-7:1.1  bind  module  new_id  uevent  unbind

  mcuee at Ubuntu804:/sys/bus/usb/drivers/usbhid$ su -
  Password:
  root at Ubuntu804:~# cd /sys/bus/usb/drivers/usbhid/
  root at Ubuntu804:/sys/bus/usb/drivers/usbhid# ls
  1-3:1.0  1-5:1.0  1-7:1.0  1-7:1.1  bind  module  new_id  uevent  unbind
  root at Ubuntu804:/sys/bus/usb/drivers/usbhid# echo -n 1-7:1.0 >unbind
  root at Ubuntu804:/sys/bus/usb/drivers/usbhid# echo -n 1-7:1.1 >unbind

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