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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 <>

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 <>
Signed-off-by: David S. Miller <>
Signed-off-by: Greg Kroah-Hartman <>
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 {

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