netdev - Re: [PATCH next 02/84] ipvs: Don't use current in proc_do_defense

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Message-ID: <20150924013800.GA4495@verge.net.au>
Date:	Thu, 24 Sep 2015 10:38:03 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Pablo Neira Ayuso <pablo@...filter.org>,
	David Miller <davem@...emloft.net>,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	lvs-devel@...r.kernel.org, Julian Anastasov <ja@....bg>
Subject: Re: [PATCH next 02/84] ipvs: Don't use current in
 proc_do_defense_mode

On Tue, Sep 22, 2015 at 08:53:30PM -0500, Eric W. Biederman wrote:
> Simon Horman <horms@...ge.net.au> writes:
> 
> > On Mon, Sep 21, 2015 at 01:01:39PM -0500, Eric W. Biederman wrote:
> >> Instead store ipvs in extra2 so that proc_do_defense_mode can easily
> >> find the ipvs that it's value is associated with.
> >> 
> >> Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
> >
> > I am wondering if this fix should be included in v4.3 and stable.
> > Can the problem occur in practice?
> 
> I believe a lookup in one network namespace followed by write in another
> network namespace would do it.  So I think it would take so pretty
> deliberate and more or less peculiar actions to make it happen.
> 
> I don't know how important the update_defense_level call is or how bad
> it is if it does not run in a network namespace .

Thanks, my feeling is that this problem can be fixed via next.
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