Luca Boccassi
ea63a260d4
The only piece missing was to somehow make /proc appear in the new user+mount namespace. It is not possible to mount a new /proc instance, not even with hidepid=invisible,subset=pid, in a user namespace unless a PID namespace is created too (and also at the same time as the other namespaces, it is not possible to mount a new /proc in a child process that creates a PID namespace forked from a parent that created a user+mount namespace, it has to happen at the same time). Use the host's /proc with a bind-mount as a fallback for this case. User session services would already run with it, so nothing is lost.
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