The way I found this was by testing the SRU in vivid - for some reason
the X server was sending Request packets with a addresses field empty.
Other Ubuntu releases are not doing this. I haven't yet investigated if
why it was doing this.
** Also affects: lightdm (Ubuntu)
Importance: Undecided
Status: New
** Also affects: lightdm (Ubuntu Wily)
Importance: Undecided
Status: New
** Changed in: lightdm (Ubuntu)
Status: New => Fix Committed
** Changed in: lightdm (Ubuntu Wily)
Status: New => Fix Committed
** Changed in: lightdm (Ubuntu)
Importance: Undecided => Critical
** Changed in: lightdm (Ubuntu Wily)
Importance: Undecided => Critical
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https://bugs.launchpad.net/bugs/1516831
Title:
XDMCP Request packet with no addresses crashes LightDM
Status in Light Display Manager:
Fix Released
Status in Light Display Manager 1.14 series:
Fix Released
Status in Light Display Manager 1.16 series:
Fix Released
Status in lightdm package in Ubuntu:
Fix Committed
Status in lightdm source package in Wily:
Fix Committed
Bug description:
[Impact]
If LightDM receives an XDMCP Request packet with no addresses then it will
attempt to access a negative index into an array and crash. This only occurs if
the XDMCP server is enabled.
[Test Case]
1. Enable XDMCP in lightdm.conf:
[XDMCPServer]
enabled=true
2. Start LightDM
3. Send an XDMCP Request without an empty addresses field (valid XDMCP
servers do not send this).
Expected result:
The request is ignored.
Observed result:
LightDM crashes.
To manage notifications about this bug go to:
https://bugs.launchpad.net/lightdm/+bug/1516831/+subscriptions
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