netdev - Re: Please add 2dce224f469f ("netns: protect netns ID lookups with RCU") to LTS

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Date:   Tue, 14 Sep 2021 08:58:00 +0000
From:   Haakon Bugge <haakon.bugge@...cle.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     Sasha Levin <sashal@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Linux-Net <netdev@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        OFED mailing list <linux-rdma@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Guillaume Nault <gnault@...hat.com>
Subject: Re: Please add 2dce224f469f ("netns: protect netns ID lookups with
 RCU") to LTS



> On 13 Sep 2021, at 10:42, Greg KH <gregkh@...uxfoundation.org> wrote:
> 
> On Fri, Sep 10, 2021 at 02:22:32PM +0000, Haakon Bugge wrote:
>> 
>> 
>>> On 9 Sep 2021, at 15:30, Greg KH <gregkh@...uxfoundation.org> wrote:
>>> 
>>> On Thu, Sep 09, 2021 at 01:10:05PM +0000, Haakon Bugge wrote:
>>>> Hi Greg & Sasha,
>>>> 
>>>> 
>>>> tl;dr: Please add 2dce224f469f ("netns: protect netns ID lookups with
>>>> RCU") to the stable releases from v5.4 and older. It fixes a
>>>> spin_unlock_bh() in peernet2id() called with IRQs off. I think this
>>>> neat side-effect of commit 2dce224f469f was quite un-intentional,
>>>> hence no Fixes: tag or CC: stable.
>>> 
>>> Please provide a working backport for all of the relevant kernel
>>> verisons, as it does not apply cleanly on it's own.
>> 
>> I've done the backports. 4.9 is actually not needed, because it uses spin_{lock,unlock}_irqsave() in peernet2id(). Hence, we have an "offending" commit which this one fixes:
>> 
>> fba143c66abb ("netns: avoid disabling irq for netns id")
>> 
>> Will get'm out during the weekend.
> 
> All now queued up, thanks.

Thanks for helping me out here, Greg!


Appreciated, Håkon

> 
> greg k-h