Commit 2fdc1c80 authored Jan 17, 2011 by Romain Francoise Committed by David S. Miller Jan 18, 2011

ipv6: Silence privacy extensions initialization



When a network namespace is created (via CLONE_NEWNET), the loopback
interface is automatically added to the new namespace, triggering a
printk in ipv6_add_dev() if CONFIG_IPV6_PRIVACY is set.

This is problematic for applications which use CLONE_NEWNET as
part of a sandbox, like Chromium's suid sandbox or recent versions of
vsftpd. On a busy machine, it can lead to thousands of useless
"lo: Disabled Privacy Extensions" messages appearing in dmesg.

It's easy enough to check the status of privacy extensions via the
use_tempaddr sysctl, so just removing the printk seems like the most
sensible solution.

Signed-off-by: Romain Francoise <romain@orebokech.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 6aefc522

net/ipv6/addrconf.c

+0 −3

Original line number	Original line	Diff line number	Diff line
	@@ -420,9 +420,6 @@ static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
	dev->type == ARPHRD_TUNNEL6 \|\|		dev->type == ARPHRD_TUNNEL6 \|\|
	dev->type == ARPHRD_SIT \|\|		dev->type == ARPHRD_SIT \|\|
	dev->type == ARPHRD_NONE) {		dev->type == ARPHRD_NONE) {
	printk(KERN_INFO
	"%s: Disabled Privacy Extensions\n",
	dev->name);
	ndev->cnf.use_tempaddr = -1;		ndev->cnf.use_tempaddr = -1;
	} else {		} else {
	in6_dev_hold(ndev);		in6_dev_hold(ndev);