From: Alexander Y. Fomichev <git.user@gmail.com>
Date: Mon, 25 Aug 2014 12:26:45 +0000 (+0400)
Subject: net: prevent of emerging cross-namespace symlinks
X-Git-Tag: fixes-for-v3.18-merge-window~162^2~52
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4c75431ac3520631f1d9e74aa88407e6374dbbc4;p=pandora-kernel.git

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: Alexander Y. Fomichev <git.user@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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