Operating Systems

Server: Ubuntu 19.10

Client: Ubuntu 19.04, Ubuntu 19.04

Barrier Version

2.3.1+dfsg-1

Steps to reproduce bug

1. Launch barriers
2. Connect to barriers with a client
3. Observe for a few minutes that memory usage is not growing substantially
4. Launch a second client attempting to connect to barriers with the same name
5. Watch memory usage grow substantially (~2MB/minute)
6. Disable the second client, and observe that memory usage growth stops

Other info

• Downstream Ubuntu bug report: https://bugs.launchpad.net/ubuntu/+source/barrier/+bug/1840483
• Is there a way to work around it? Yes, restart barriers
• Does this bug prevent you from using Barrier entirely? No

This is arguably a DOS attack vector from users on my network; if they know the names of my screens (which are just hostnames in my configuration, so not hard to work out), they can exhaust memory on the host running barriers.