[PATCH 3/4] userns/inotify: Initial implementation of inotify per-userns

[Eric W. Biederman]

Nikolay Borisov <kernel at kyup.com> writes:

> Having started writing the code I just realized it's possible that 2
> uids in different namespaces map to the same KUID, depending on how the
> UID map is setup, right? If that's the case then I guess it will make
> sense to actually hold kuid + userns pointer in nsuser_state to be able
> to distinguish between the state of kuid 1500 in userns1 and kuid1500 in
> userns2. Does that make sense?

Yes, very much so.

Especially in nested user namespaces this is not only possible but
required.

Eric