Daan De Meyer
838528104b
Whenever delegating UID ranges to a user namespace, it can also be useful to map the foreign UID range, so that the container running in the user namespace with delegated UID ranges can download container images and unpack them to the foreign UID range. Let's add an option mapForeign to make this possible. Note that this option gives unprivileged users full access to the any foreign UID range owned directory that they can access. Hence it is recommended (and already was recommended) to store foreign UID range owned directories in a 0700 directory owned by the owner of the tree to avoid access and modifications by other users. This is already the case for the main users of the foreign UID range, namely /var/lib/machines, /var/lib/portables and /home/<user> which all use 0700 as their mode. Users will also be able to create foreign UID range owned inodes in any directories their own user can write to (on most systems this means /tmp, /var/tmp and /home/<user>).
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