Hello tor-dev,
Not much has happened since the last status report. I have been fixing small issues [1] with the seccomp2 filter and have been working on the change requests from nickm's code review for merging stage 2 of tor sandboxing [2].
I am currently waiting for feedback, which is very likely to be final, and a merge of my work in tor's master branch.
After stage 2 is completed, I will move on with stage 3 by dropping privileges in different sections of the tor program, as they no longer become required, in order to create a more restrictive sandbox.