netdev - [PATCH] smsc95xx: generate random MAC address once, not every ifup

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20101018231639.GA15955@mersenne.largestprime.net>
Date:	Tue, 19 Oct 2010 10:16:39 +1100
From:	Bernard Blackham <bernard@...gestprime.net>
To:	Steve Glendinning <steve.glendinning@...c.com>,
	netdev@...r.kernel.org
Cc:	linux-omap@...r.kernel.org
Subject: [PATCH] smsc95xx: generate random MAC address once, not every ifup

The smsc95xx driver currently generates a new random MAC address
every time the interface is brought up. This makes it impossible to
override using the standard `ifconfig hw ether` approach.

Past patches tried to make the MAC address a module parameter or
base it off the die ID, but it seems to me much simpler (and
hopefully less controversial) to stick with the current random
generation scheme, but allow the user to change the address.

This patch does exactly that - it moves the random address
generation from smsc95xx_reset() into smsc95xx_bind(), so that it is
done once on module load, not on every ifup. The user can then
override this using the standard mechanisms.

Applies against 2.6.35 and linux-2.6 head.

Signed-off-by: Bernard Blackham <b-omap@...gestprime.net>

---

--- a/drivers/net/usb/smsc95xx.c	2010-10-19 00:15:35.915612223 +1100
+++ b/drivers/net/usb/smsc95xx.c	2010-10-19 00:15:55.408550929 +1100
@@ -805,8 +805,6 @@ static int smsc95xx_reset(struct usbnet
 		return ret;
 	}

-	smsc95xx_init_mac_address(dev);
-
 	ret = smsc95xx_set_mac_address(dev);
 	if (ret < 0)
 		return ret;
@@ -1047,6 +1045,8 @@ static int smsc95xx_bind(struct usbnet *
 	pdata->use_tx_csum = DEFAULT_TX_CSUM_ENABLE;
 	pdata->use_rx_csum = DEFAULT_RX_CSUM_ENABLE;

+	smsc95xx_init_mac_address(dev);
+
 	/* Init all registers */
 	ret = smsc95xx_reset(dev);

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html