I would like to propose using PrivateTmp for ddclient systemd unit file This should make the use of /tmp directory more secure and avoid users from being able to potentially effect it. http://fedoraproject.org/wiki/Features/ServicesPrivateTmp
Any change on this bug. We are coming up to Feature Freeze, and would like some comment on this bug. If you do not believe this application uses /tmp than please comment on this and close the bug. If you believe this application needs to use /tmp to communicate with other applications or users then you can close this bug with that comment. If your app does not use systemd, then close this bug with that comment. If you have no idea, then please add a comment, and change the bug to assigned. I need to update the status on this feature. Thanks for your help.
As of now, ddclient does not use systemd. OTOH, the /etc/init.d startup file is broken since f16, and the service must be patched to start. See also bug #789567
This bug appears to have been reported against 'rawhide' during the Fedora 19 development cycle. Changing version to '19'. (As we did not run this process for some time, it could affect also pre-Fedora 19 development cycle bugs. We are very sorry. It will help us with cleanup during Fedora 19 End Of Life. Thank you.) More information and reason for this action is here: https://fedoraproject.org/wiki/BugZappers/HouseKeeping/Fedora19
There is no /tmp usage by default except you run "ddclient --test" - where I would treat the usage of /tmp as expected.