netdev - Re: Possible netlink autobind regression

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Date:	Thu, 17 Sep 2015 13:25:05 +0200
From:	Thomas Graf <tgraf@...g.ch>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Cong Wang <cwang@...pensource.com>, Tejun Heo <tj@...nel.org>,
	David Miller <davem@...emloft.net>,
	Tom Herbert <tom@...bertland.com>, kafai@...com,
	kernel-team <kernel-team@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jiri Pirko <jiri@...nulli.us>,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	Scott Feldman <sfeldma@...il.com>
Subject: Re: Possible netlink autobind regression

On 09/17/15 at 01:15pm, Herbert Xu wrote:
> On Wed, Sep 16, 2015 at 10:02:00PM -0700, Cong Wang wrote:
> >
> > This part doesn't look correct, seems it is checking if this is a kernel
> > netlink socket rather than if it is bound. But I am not sure...
> 
> Good point.  I've changed it so that bound is only set for non-kernel
> sockets.
> 
> ---8<---
> netlink: Fix autobind race condition that leads to zero port ID
> 
> The commit c0bb07df7d981e4091432754e30c9c720e2c0c78 ("netlink:
> Reset portid after netlink_insert failure") introduced a race
> condition where if two threads tried to autobind the same socket
> one of them may end up with a zero port ID.
> 
> This patch reverts that commit and instead fixes it by introducing
> a separte "bound" variable to indicate whether a user-space socket
> has been bound.
> 
> Fixes: c0bb07df7d98 ("netlink: Reset portid after netlink_insert failure")
> Reported-by: Tejun Heo <tj@...nel.org>
> Reported-by: Linus Torvalds <torvalds@...ux-foundation.org>
> Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
> Reviewed-by: Cong Wang <cwang@...pensource.com>

Acked-by: Thomas Graf <tgraf@...g.ch>
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