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Partial answer to #2

Posted Nov 16, 2010 23:03 UTC (Tue) by jamesmrh (guest, #31622)
Parent article: Ghosts of Unix past, part 3: Unfixable designs

Per-user /tmp has been implemented with Linux namespaces for use with SELinux kiosk mode. It's configurable via PAM (see pam_namespace(8), and not limited to any particular use.

The fs namespace ideas came from Plan 9, but weren't really useful until integrated with PAM.

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