[ 24/44] net: feed /dev/random with the MAC address when registering a device

From: Greg Kroah-Hartman
Date: Mon Aug 13 2012 - 18:04:33 EST


From: Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>

3.0-stable review patch. If anyone has any objections, please let me know.

------------------

From: Theodore Ts'o <tytso@xxxxxxx>

commit 7bf2357524408b97fec58344caf7397f8140c3fd upstream.

Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
Cc: David Miller <davem@xxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
net/core/dev.c | 3 +++
net/core/rtnetlink.c | 1 +
2 files changed, 4 insertions(+)

--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1163,6 +1163,7 @@ static int __dev_open(struct net_device
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_devic
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_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);
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1304,6 +1304,7 @@ static int do_setlink(struct net_device
goto errout;
send_addr_notify = 1;
modified = 1;
+ add_device_randomness(dev->dev_addr, dev->addr_len);
}

if (tb[IFLA_MTU]) {


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