net: prevent of emerging cross-namespace symlinks
Code manipulating sysfs symlinks on adjacent net_devices(s) currently doesn't take into account that devices potentially belong to different namespaces. This patch trying to fix an issue as follows: - check for net_ns before creating / deleting symlink. for now only netdev_adjacent_rename_links and __netdev_adjacent_dev_remove are affected, afaics __netdev_adjacent_dev_insert implies both net_devs belong to the same namespace. - Drop all existing symlinks to / from all adj_devs before switching namespace and recreate them just after. Signed-off-by: NAlexander Y. Fomichev <git.user@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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