linux-kernel - Re: [PATCH v2 1/2] mm/migrate: Fix read-only page got writable when recover pte

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Message-ID: <Y212k5F+/5xHksW/@x1n>
Date:   Thu, 10 Nov 2022 17:09:23 -0500
From:   Peter Xu <peterx@...hat.com>
To:     Nadav Amit <nadav.amit@...il.com>
Cc:     kernel list <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Ives van Hoorne <ives@...esandbox.io>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>, stable@...r.kernel.org
Subject: Re: [PATCH v2 1/2] mm/migrate: Fix read-only page got writable when
 recover pte

On Thu, Nov 10, 2022 at 01:28:31PM -0800, Nadav Amit wrote:
> On Nov 10, 2022, at 12:31 PM, Peter Xu <peterx@...hat.com> wrote:
> 
> > Ives van Hoorne from codesandbox.io reported an issue regarding possible
> > data loss of uffd-wp when applied to memfds on heavily loaded systems.  The
> > sympton is some read page got data mismatch from the snapshot child VMs.
> 
> symptom (if you care)

Yes, but,

> 
> Other than that LGTM

this definitely matters more. :)  Thanks for taking a look, Nadav.

-- 
Peter Xu