| 2016-04-26 14:06:07 |
Patrick Monnerat |
bug |
|
|
added bug |
| 2016-04-26 14:06:07 |
Patrick Monnerat |
attachment added |
|
Patch for 1.10.6 as described in text https://bugs.launchpad.net/bugs/1575200/+attachment/4647960/+files/lightdm-1.10.6-linklocal.patch |
|
| 2016-04-26 14:11:46 |
Robert Ancell |
lightdm: importance |
Undecided |
Medium |
|
| 2016-04-26 14:11:48 |
Robert Ancell |
lightdm: status |
New |
Triaged |
|
| 2016-04-26 15:50:59 |
Launchpad Janitor |
branch linked |
|
lp:~pm-datasphere/lightdm/lp1575200 |
|
| 2016-04-28 07:04:14 |
Robert Ancell |
lightdm: status |
Triaged |
Fix Committed |
|
| 2016-04-28 07:04:17 |
Robert Ancell |
lightdm: milestone |
|
1.19.0 |
|
| 2016-04-28 07:04:25 |
Robert Ancell |
nominated for series |
|
lightdm/1.18 |
|
| 2016-04-28 07:04:25 |
Robert Ancell |
bug task added |
|
lightdm/1.18 |
|
| 2016-04-28 07:04:47 |
Robert Ancell |
lightdm/1.18: milestone |
|
1.18.2 |
|
| 2016-04-28 07:04:49 |
Robert Ancell |
lightdm/1.18: importance |
Undecided |
Medium |
|
| 2016-04-28 07:04:52 |
Robert Ancell |
lightdm/1.18: status |
New |
Fix Committed |
|
| 2016-04-28 07:04:59 |
Robert Ancell |
bug task added |
|
lightdm (Ubuntu) |
|
| 2016-04-28 07:05:08 |
Robert Ancell |
nominated for series |
|
Ubuntu Xenial |
|
| 2016-04-28 07:05:08 |
Robert Ancell |
bug task added |
|
lightdm (Ubuntu Xenial) |
|
| 2016-04-28 07:05:17 |
Robert Ancell |
lightdm (Ubuntu Xenial): status |
New |
Fix Committed |
|
| 2016-04-28 07:05:19 |
Robert Ancell |
lightdm (Ubuntu): status |
New |
Fix Committed |
|
| 2016-04-28 07:05:20 |
Robert Ancell |
lightdm (Ubuntu): importance |
Undecided |
Medium |
|
| 2016-04-28 07:05:22 |
Robert Ancell |
lightdm (Ubuntu Xenial): importance |
Undecided |
Medium |
|
| 2016-04-28 07:07:12 |
Robert Ancell |
nominated for series |
|
lightdm/1.10 |
|
| 2016-04-28 07:07:12 |
Robert Ancell |
bug task added |
|
lightdm/1.10 |
|
| 2016-04-28 07:07:12 |
Robert Ancell |
nominated for series |
|
lightdm/1.16 |
|
| 2016-04-28 07:07:12 |
Robert Ancell |
bug task added |
|
lightdm/1.16 |
|
| 2016-04-28 07:08:06 |
Robert Ancell |
lightdm/1.10: status |
New |
Fix Committed |
|
| 2016-04-28 07:08:08 |
Robert Ancell |
lightdm/1.16: status |
New |
Fix Committed |
|
| 2016-04-28 07:08:13 |
Robert Ancell |
lightdm/1.16: milestone |
|
1.16.8 |
|
| 2016-04-28 07:08:24 |
Robert Ancell |
lightdm/1.10: milestone |
|
1.10.7 |
|
| 2016-04-28 07:09:31 |
Robert Ancell |
lightdm/1.16: importance |
Undecided |
Medium |
|
| 2016-04-28 07:09:33 |
Robert Ancell |
lightdm/1.10: importance |
Undecided |
Medium |
|
| 2016-04-28 07:09:49 |
Robert Ancell |
nominated for series |
|
Ubuntu Trusty |
|
| 2016-04-28 07:09:49 |
Robert Ancell |
bug task added |
|
lightdm (Ubuntu Trusty) |
|
| 2016-04-28 07:09:49 |
Robert Ancell |
nominated for series |
|
Ubuntu Wily |
|
| 2016-04-28 07:09:49 |
Robert Ancell |
bug task added |
|
lightdm (Ubuntu Wily) |
|
| 2016-04-28 07:09:56 |
Robert Ancell |
lightdm (Ubuntu Trusty): status |
New |
Fix Committed |
|
| 2016-04-28 07:09:58 |
Robert Ancell |
lightdm (Ubuntu Wily): status |
New |
Fix Committed |
|
| 2016-04-28 07:10:03 |
Robert Ancell |
lightdm (Ubuntu Trusty): importance |
Undecided |
Medium |
|
| 2016-04-28 07:10:05 |
Robert Ancell |
lightdm (Ubuntu Wily): importance |
Undecided |
Medium |
|
| 2016-04-28 08:30:49 |
Ubuntu Foundations Team Bug Bot |
tags |
|
patch |
|
| 2016-04-28 08:30:58 |
Ubuntu Foundations Team Bug Bot |
bug |
|
|
added subscriber Ubuntu Review Team |
| 2016-05-02 17:57:10 |
Rex Dieter |
bug |
|
|
added subscriber Rex Dieter |
| 2016-05-05 00:40:49 |
Robert Ancell |
lightdm: status |
Fix Committed |
Fix Released |
|
| 2016-05-05 02:23:56 |
Launchpad Janitor |
lightdm (Ubuntu): status |
Fix Committed |
Fix Released |
|
| 2016-06-21 04:26:48 |
Robert Ancell |
lightdm/1.18: status |
Fix Committed |
Fix Released |
|
| 2016-06-21 04:40:39 |
Robert Ancell |
description |
I've discovered a problem in lightdm XDMCP using link-local IPv6 addresses without interface index to connect to X server.
It has been originally reported at https://bugzilla.redhat.com/show_bug.cgi?id=1322775.
The problem can be fixed by having the XDMCP client not transmitting link-local addresses in the request, but if it does, lightdm XDMCP server can be a lot smarter if the attached patch is applied.
It changes the X server address selection order to set the lowest preference to link-local addresses, even if matching the source address or family.
This is not 100% full-proof: if only link-local addresses have been received, one of them is used anyway. In this case, a complete solution would be to determine and set the address interface index if not ambiguous.
However, this patch fixes the problem for most of the non-pathological
cases. |
[Impact]
LightDM doesn't pick the best IPv6 address on offer from clients (picks link-local addresses over non link-local).
[Test Case]
1. Start LightDM with XDMCP server enabled
2. Connect XDMCP client that sends IPv6 link-local addresses to LightDM
Expected result:
LightDM picks a non link-local address and is able to connect to the client
Observed result:
LightDM picks the link-local address address if it is first
[Regression Potential]
Small risk of behaviour change due to new IP selection method.
Original report:
I've discovered a problem in lightdm XDMCP using link-local IPv6 addresses without interface index to connect to X server.
It has been originally reported at https://bugzilla.redhat.com/show_bug.cgi?id=1322775.
The problem can be fixed by having the XDMCP client not transmitting link-local addresses in the request, but if it does, lightdm XDMCP server can be a lot smarter if the attached patch is applied.
It changes the X server address selection order to set the lowest preference to link-local addresses, even if matching the source address or family.
This is not 100% full-proof: if only link-local addresses have been received, one of them is used anyway. In this case, a complete solution would be to determine and set the address interface index if not ambiguous.
However, this patch fixes the problem for most of the non-pathological
cases. |
|
| 2016-06-23 21:03:10 |
Brian Murray |
bug |
|
|
added subscriber Ubuntu Stable Release Updates Team |
| 2016-06-23 21:03:12 |
Brian Murray |
bug |
|
|
added subscriber SRU Verification |
| 2016-06-23 21:03:24 |
Brian Murray |
tags |
patch |
patch verification-needed |
|
| 2016-07-13 06:19:16 |
Launchpad Janitor |
lightdm (Ubuntu Xenial): status |
Fix Committed |
Fix Released |
|
