linux-kernel - Re: [64/66] Phonet: disable network namespace support

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Date:	Mon, 25 Oct 2010 10:43:32 +0300
From:	"Rémi Denis-Courmont" 
	<remi.denis-courmont@...ia.com>
To:	ext Ben Hutchings <ben@...adent.org.uk>
Cc:	Greg KH <gregkh@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...nel.org" <stable@...nel.org>,
	"stable-review@...nel.org" <stable-review@...nel.org>,
	"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"alan@...rguk.ukuu.org.uk" <alan@...rguk.ukuu.org.uk>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [64/66] Phonet: disable network namespace support

On Saturday 23 October 2010 00:22:33 ext Ben Hutchings, you wrote:
> On Fri, 2010-10-22 at 11:35 -0700, Greg KH wrote:
> I've had one report today that the bug is still reproducible in the
> current Debian kernel, which includes this change.  Rémi, how have you
> tested this fix?

I don´t actually remember, but I obviously missed something :-(
With similar problem reports in Nokia/MeeGo, that´ s what I added last week:

From: Rémi Denis-Courmont <remi.denis-courmont@...ia.com>
Subject: [PATCH] Phonet: device notifier only runs on initial namespace

This should really fix the OOPS when doing:

  unshare(CLONE_NEWNET);
  exit(0);

while the phonet module is loaded.

Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@...ia.com>
---
 net/phonet/pn_dev.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/net/phonet/pn_dev.c b/net/phonet/pn_dev.c
index 5a2275c..d94ca91 100644
--- a/net/phonet/pn_dev.c
+++ b/net/phonet/pn_dev.c
@@ -225,6 +225,9 @@ static int phonet_device_notify(struct notifier_block *me, unsigned long what,
 {
 	struct net_device *dev = arg;
 
+	if (!net_eq(dev_net(dev), &init_net))
+		return 0;
+
 	switch (what) {
 	case NETDEV_REGISTER:
 		if (dev->type == ARPHRD_PHONET)
-- 
1.7.1
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