This bug was fixed in the package lightdm - 1.18.3-0ubuntu1
---------------
lightdm (1.18.3-0ubuntu1) xenial; urgency=medium
* New upstream release:
- Fix error that caused stdin to be closed. This seems to have lots of bad
side effects (greeter not working correctly, multi-seat failing).
- Add support for greeters running inside sessions. This is enabled by
setting X-LightDM-Allow-Greeter inside the session .desktop file.
The session can then use liblightdm to connect one greeter to the
daemon. The communication is done using a socket
(/var/run/lightdm/<user>/greeter-socket) that is accessible to any
process run by that user. Consider controlling access to this socket
using a MAC system such as AppArmor. (LP: #1582242)
- Fix various memory management issues exposed by the use of in-session
greeters.
* debian/patches/lp1605117.patch:
- Applied upstream
-- Robert Ancell <robert.anc...@canonical.com> Fri, 12 Aug 2016
11:37:43 +1200
** Changed in: lightdm (Ubuntu Xenial)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1582242
Title:
Support a user-session mode for authenticating
Status in Light Display Manager:
Fix Released
Status in Light Display Manager 1.18 series:
Fix Released
Status in lightdm package in Ubuntu:
Fix Released
Status in lightdm source package in Xenial:
Fix Released
Status in lightdm source package in Yakkety:
Fix Released
Bug description:
[Impact]
Ubuntu phone development requires in session greeter functionality to perform
suitably. This functionality does not exist in current versions of LightDM.
[Test Case]
1. Install a session that supports in session greeter
2. Log into that session
3. Activate greeter functionality
Expected result:
It works
Observed result:
The functionality is not implemented.
[Regression Potential]
Some risk of changing existing behaviour, reduced by regression tests still
passing. Functionality is only enabled for sessions that opt-in to this
behaviour so additional security risks is limited to new sessions.
Original description:
We talked about this in person in Prague.
Ideally a greeter could run as in the user's session and act as a
lockscreen for the user as well as a way to authenticate/log-in as
other users.
This would let us avoid running a whole other session for the greeter
on the phone, which is memory intensive.
It might be easiest for unity8 if that API was still just liblightdm,
just running in a special mode. But I'm not picky on how it's done.
There may be security questions around this. I asked Jamie and Tyler
about it, I'll post any concerns from them.
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