linux-kernel - Re: [PATCH V5] mm: fix use-after free of page

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Date:   Mon, 29 Aug 2022 16:14:25 +0530
From:   Charan Teja Kalla <quic_charante@...cinc.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     <mhocko@...e.com>, <david@...hat.com>, <vbabka@...e.cz>,
        <pasha.tatashin@...een.com>, <shakeelb@...gle.com>,
        <sieberf@...zon.com>, <sjpark@...zon.de>,
        <william.kucharski@...cle.com>, <willy@...radead.org>,
        <quic_pkondeti@...cinc.com>, <minchan@...gle.com>,
        <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>
Subject: Re: [PATCH V5] mm: fix use-after free of page_ext after race with
 memory-offline

Hi Andrew,

On 8/27/2022 8:49 AM, Andrew Morton wrote:
> On Fri, 26 Aug 2022 12:26:33 +0530 Charan Teja Kalla <quic_charante@...cinc.com> wrote:
> 
>> The below is one path where race between page_ext and  offline of the
>> respective memory blocks will cause use-after-free on the access of
>> page_ext structure.
> 
> What are people's thoughts on a -stable backport?  It looks like the
> bug has been there for years and the means of hitting it are obscure
> and the patch isn't minor, so I'm thinking no?

Michal also said no to back port and I also agree with.

https://lore.kernel.org/all/YvNc8vuinnddc78j@dhcp22.suse.cz/#t
https://lore.kernel.org/all/3aab7518-ff57-abdb-8bab-ea581197a07e@quicinc.com/


Thanks,
Charan


>