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Old 04-24-2007, 09:50 PM   #1
Sorab
LQ Newbie
 
Registered: Apr 2007
Location: Honolulu, Hawaii, USA
Distribution: Fedora Core 6
Posts: 3

Rep: Reputation: 0
LIBUSB - usb driver with non-root credentials


- I am trying to connect a USB device (driver for which is written using libusb) with non-root credentials...the app. runs fine with root credentials. I am running fedora core 6 ( 2.6.20-1.2933.fc6).

- The udev persmissions file /etc/security/console.perms.d/ispvme.perms has -
<ispvme>=/dev/ispvme* <console> 0600 <ispvme> 0600 root

- The /etc/udev/rules.d/76-ispvme.rules for PAM has :
SUBSYSTEM=="usb_device", ACTION=="add", SYSFS{idVendor}=="8001", SYSFS{idProduct}=="1134", SYMLINK+="ispvme-%k"

After skill of udevd and respawn, {$/sbin/lsusb} spits the following when the device is connected-
Bus 005 Device 005: ID 1134:8001.

It never lists the device with the symbolic link "ispvme-*" under /dev/ and I cannot run the app. with non-root credentials.

I am really at my wits end with this issue. You see anything wrong with any of the above settings? Any inputs will be greatly appreciated...

Thank you.

PS - This is what udev.conf file bears -

udev_root="/dev/"
udev_db="/dev/.udevdb"
udev_rules="/etc/udev/rules.d/"
udev_permissions="/etc/udev/permissions.d/"
default_mode="0660"
udev_log="err"

Last edited by Sorab; 04-24-2007 at 10:16 PM.
 
Old 04-25-2007, 05:33 PM   #2
Sorab
LQ Newbie
 
Registered: Apr 2007
Location: Honolulu, Hawaii, USA
Distribution: Fedora Core 6
Posts: 3

Original Poster
Rep: Reputation: 0
Cool Issue Resolved.

Summary of what I did to fix this issue for the forum posterity-

Step 1:
Modify /etc/udev/udev.conf and ensure that it atleast has following settings-

udev_root="/dev/"
udev_db="/dev/.udevdb"
udev_rules="/etc/udev/rules.d/"
udev_permissions="/etc/udev/permissions.d/"
default_mode="0660"
udev_log="err"

Step 2:
Create udev rules file OR append to exisiting /etc/udev/rules.d/10-local.rules:

#your_usb_device - foo
KERNEL=="*[0-9]", SUBSYSTEM=="usb_device", ACTION=="add",SYSFS{idVendor}=="xxxx", SYSFS{idProduct}=="xxxx", SYMLINK+="foo-%k"

Step 3:
Create PAM rules file /etc/security/console.perms.d/foo.perms:

<foo>=/dev/foo* <console> 0600 <foo> 0600 root

Step 4:
Respawn udev deamon and run the newly created rules.
$skill udedv
$/sbin/udevd -d
 
  


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