On Wed, Apr 23, 2014 at 05:54:31PM -0700, Andy Lutomirski wrote:
> This requires CAP_SYS_ADMIN and it requires that the caller is not
> chrooted. path must be a mountpoint and flags must be zero.
>
> It lazy-unmounts everything outside path, and it moves path to /.
> When it's done, the current process's root is '/'. If you want to
> retain temporary access to outside things, you can keep an fd open.
> If the old root is shared, it is made private. It's okay for path to
> be shared (I think).
>
> If other things are already running in the current mount namespace,
> then their root directory stays the same, so they keep working, but
> they may be a little confused.
>
> I think this could replace pivot_root for most use cases, and it could
> simplify programs like switch_root.
>
> Thoughts?
chdir(new);
pivot_root(".", old);
umount(old, MNT_DETACH);
chroot(".");
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