linux-kernel - Re: [PATCH V3] mm: fix use-after free of page

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Message-Id: <20220809185714.5af7057c1270b11079cb196a@linux-foundation.org>
Date:   Tue, 9 Aug 2022 18:57:14 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Charan Teja Kalla <quic_charante@...cinc.com>
Cc:     <mhocko@...e.com>, <david@...hat.com>, <pasha.tatashin@...een.com>,
        <sieberf@...zon.com>, <shakeelb@...gle.com>, <sjpark@...zon.de>,
        <dhowells@...hat.com>, <willy@...radead.org>,
        <quic_pkondeti@...cinc.com>, <linux-kernel@...r.kernel.org>,
        <linux-mm@...ck.org>
Subject: Re: [PATCH V3] mm: fix use-after free of page_ext after race with
 memory-offline

On Tue, 9 Aug 2022 20:16:43 +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.

Has this race ever been observed at runtime?

Given the size of the fix, I'm looking for excuses to not backport it
into -stable kernels!