linux-kernel - [127/143] ipv6: Silence privacy extensions initialization

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Date:	Thu, 05 May 2011 17:21:52 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Romain Francoise <romain@...bokech.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [127/143] ipv6: Silence privacy extensions initialization

2.6.32-longterm review patch.  If anyone has any objections, please let us know.

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

From: Romain Francoise <romain@...bokech.com>

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@...bokech.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 net/ipv6/addrconf.c |    3 ---
 1 file changed, 3 deletions(-)

--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -407,9 +407,6 @@ static struct inet6_dev * ipv6_add_dev(s
 	    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);

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