linux-kernel - [PATCH 06/12] net: feed /dev/random with the MAC address when registering a device

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Date:	Fri,  6 Jul 2012 18:44:58 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Linux Kernel Developers List <linux-kernel@...r.kernel.org>
Cc:	ewust@...ch.edu, zakir@...ch.edu, nadiah@...ucsd.edu,
	jhalderm@...ch.edu, Theodore Ts'o <tytso@....edu>,
	David Miller <davem@...emloft.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	stable@...r.kernel.org
Subject: [PATCH 06/12] net: feed /dev/random with the MAC address when registering a device

Cc: David Miller <davem@...emloft.net>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
Cc: stable@...r.kernel.org
---
 net/core/dev.c       | 3 +++
 net/core/rtnetlink.c | 1 +
 2 files changed, 4 insertions(+)

diff --git a/net/core/dev.c b/net/core/dev.c
index 6df2140..bdd1e88 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1172,6 +1172,7 @@ 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;
@@ -4763,6 +4764,7 @@ 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);
@@ -5541,6 +5543,7 @@ 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 21318d1..f058e59 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1378,6 +1378,7 @@ 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]) {
-- 
1.7.11.1.108.gb129051

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