netdev - Re: [PATCH v2] netlink: Replace rhash

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Date:	Thu, 24 Sep 2015 12:11:42 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	tj@...nel.org, cwang@...pensource.com, tom@...bertland.com,
	kafai@...com, kernel-team@...com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, torvalds@...ux-foundation.org,
	jiri@...nulli.us, nicolas.dichtel@...nd.com, tgraf@...g.ch,
	sfeldma@...il.com
Subject: Re: [PATCH v2] netlink: Replace rhash_portid with bound

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Tue, 22 Sep 2015 11:38:56 +0800

> The commit 1f770c0a09da855a2b51af6d19de97fb955eca85 ("netlink:
> Fix autobind race condition that leads to zero port ID") created
> some new races that can occur due to inconcsistencies between the
> two port IDs.
> 
> Tejun is right that a barrier is unavoidable.  Therefore I am
> reverting to the original patch that used a boolean to indicate
> that a user netlink socket has been bound.
> 
> Barriers have been added where necessary to ensure that a valid
> portid and the hashed socket is visible.
> 
> I have also changed netlink_insert to only return EBUSY if the
> socket is bound to a portid different to the requested one.  This
> combined with only reading nlk->bound once in netlink_bind fixes
> a race where two threads that bind the socket at the same time
> with different port IDs may both succeed.
> 
> Fixes: 1f770c0a09da ("netlink: Fix autobind race condition that leads to zero port ID")
> 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>

I've decided to apply this and queue it up for -stable.

Thanks everyone.
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