ipv6: Silence privacy extensions initialization

commit 2fdc1c8093255f9da877d7b9ce3f46c2098377dc upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index d1f77ccea28cafd75592b190bfc7afd1940b8840..8ac3d091a5b10d16f71cf570dc5040ed1649815a 100644 (file)
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -407,9 +407,6 @@ static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
            dev->type == ARPHRD_TUNNEL6 ||
            dev->type == ARPHRD_SIT ||
            dev->type == ARPHRD_NONE) {
-               printk(KERN_INFO
-                      "%s: Disabled Privacy Extensions\n",
-                      dev->name);
                ndev->cnf.use_tempaddr = -1;
        } else {
                in6_dev_hold(ndev);