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35a32c5
(Get the code!)
@Robert, to solve the DoS in that shell script you'd need to first securely create a tmp dir such as /tmp/lightdm-XXXXXX and then create another guest-XXXXXX tmp dir underneath it. The only downside that I can see is that the /tmp/lightdm-XXXXXX directory would not be cleaned up when the guest user ended their session.