Description of problem: udev lacks a permission entry for ACM devices (typically USB Modems). /dev/ttyACM* are created with root rw permission only. Using the standard serial port as an example, they should be root:uucp owner/group rw. (crw-rw----) This can be corrected by editing /etc/udev/permissions.d/50-udev.permissions Under the section: # serial+dialup devices Using the standard serial ports as an example: ttyS*:root:uucp:0660 add the following line: ttyACM*:root:uucp:0660 Version-Release number of selected component (if applicable): udev-039-10.15.EL4
Technical note added. If any revisions are required, please edit the "Technical Notes" field accordingly. All revisions will be proofread by the Engineering Content Services team. New Contents: Cause: Consequence: Fix: Result:
Technical note updated. If any revisions are required, please edit the "Technical Notes" field accordingly. All revisions will be proofread by the Engineering Content Services team. Diffed Contents: @@ -1,7 +1,15 @@ Cause: +udev did not contain explicit permission entries for ttyACM devices. + Consequence: +ttyACM devices were assigned the default permissions, preventing the uucp group from having read/write access. + Fix: -Result:+An explicit permission entry was added to the udev permission file, to assign ttyACM devices to the uucp group. + +Result: + +The uucp group now has read/write access to ttyACM devices.
Technical note updated. If any revisions are required, please edit the "Technical Notes" field accordingly. All revisions will be proofread by the Engineering Content Services team. Diffed Contents: @@ -1,15 +1 @@ -Cause: +Previously, the udev package did not contain explicit permission entries for ttyACM devices. Due to this behavior, ttyACM devices were assigned the default permissions, preventing the uucp group from having read/write access. This update adds An explicit permission entry to the udev permission file, to assign ttyACM devices to the uucp group, and the uucp group now has read/write access to ttyACM devices.- -udev did not contain explicit permission entries for ttyACM devices. - -Consequence: - -ttyACM devices were assigned the default permissions, preventing the uucp group from having read/write access. - -Fix: - -An explicit permission entry was added to the udev permission file, to assign ttyACM devices to the uucp group. - -Result: - -The uucp group now has read/write access to ttyACM devices.
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHBA-2011-0232.html