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

commit 7bf2357524408b97fec58344caf7397f8140c3fd upstream.

Cc: David Miller <davem@davemloft.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/net/core/dev.c b/net/core/dev.c
index 5738654..4b18703 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1177,6 +1177,7 @@ 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;
@@ -4841,6 +4842,7 @@ 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);
@@ -5621,6 +5623,7 @@ 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 2ef859a..05842ab 100644 (file)
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1354,6 +1354,7 @@ 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]) {