From: Theodore Ts'o <tytso@mit.edu>
Date: Thu, 5 Jul 2012 01:23:25 +0000 (-0400)
Subject: net: feed /dev/random with the MAC address when registering a device
X-Git-Tag: firefly_0821_release~7541^2~815
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=118f98c7de67622c27ef9c968958b6de8483357f;p=firefly-linux-kernel-4.4.55.git

net: feed /dev/random with the MAC address when registering a device

commit 7bf2357524408b97fec58344caf7397f8140c3fd upstream.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: David Miller <davem@davemloft.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/net/core/dev.c b/net/core/dev.c
index a71eafc392e7..8235b81a7db3 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1163,6 +1163,7 @@ static int __dev_open(struct net_device *dev)
 		net_dmaengine_get();
 		dev_set_rx_mode(dev);
 		dev_activate(dev);
+		add_device_randomness(dev->dev_addr, dev->addr_len);
 	}
 
 	return ret;
@@ -4730,6 +4731,7 @@ int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
 	err = ops->ndo_set_mac_address(dev, sa);
 	if (!err)
 		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
+	add_device_randomness(dev->dev_addr, dev->addr_len);
 	return err;
 }
 EXPORT_SYMBOL(dev_set_mac_address);
@@ -5507,6 +5509,7 @@ int register_netdevice(struct net_device *dev)
 	dev_init_scheduler(dev);
 	dev_hold(dev);
 	list_netdevice(dev);
+	add_device_randomness(dev->dev_addr, dev->addr_len);
 
 	/* Notify protocols, that a new device appeared. */
 	ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 861d53f5f13b..ac49ad519ca2 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1304,6 +1304,7 @@ static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
 			goto errout;
 		send_addr_notify = 1;
 		modified = 1;
+		add_device_randomness(dev->dev_addr, dev->addr_len);
 	}
 
 	if (tb[IFLA_MTU]) {