linux-kernel - Re: [RFC PATCH v2 1/2] mm/userfaultfd: fix memory corruption due to writeprotect

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Message-Id: <C255B66E-C418-4B30-B363-76441266A0DC@gmail.com>
Date:   Tue, 5 Jan 2021 00:52:48 -0800
From:   Nadav Amit <nadav.amit@...il.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Andrea Arcangeli <aarcange@...hat.com>,
        linux-mm <linux-mm@...ck.org>,
        lkml <linux-kernel@...r.kernel.org>, Yu Zhao <yuzhao@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Xu <peterx@...hat.com>,
        Pavel Emelyanov <xemul@...nvz.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Minchan Kim <minchan@...nel.org>,
        Will Deacon <will@...nel.org>, Mel Gorman <mgorman@...e.de>
Subject: Re: [RFC PATCH v2 1/2] mm/userfaultfd: fix memory corruption due to
 writeprotect

> On Jan 5, 2021, at 12:13 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> 
> On Mon, Jan 04, 2021 at 02:24:38PM -0500, Andrea Arcangeli wrote:
>> The problematic one not pictured is the one of the wrprotect that has
>> to be running in another CPU which is also isn't picture above. More
>> accurate traces are posted later in the thread.
> 
> What thread? I don't seem to have discovered it yet, and the cover
> letter from Nadav doesn't seem to have a msgid linking it either.

Sorry for that:

https://lore.kernel.org/lkml/X+K7JMrTEC9SpVIB@google.com/T/