linux-kernel - Re: [PATCH 0/5] 4.14 backports of fixes for "CoW after fork() issue"

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Message-ID: <20210421210517.GA6404@xz-x1>
Date:   Wed, 21 Apr 2021 17:05:17 -0400
From:   Peter Xu <peterx@...hat.com>
To:     Suren Baghdasaryan <surenb@...gle.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Mikulas Patocka <mpatocka@...hat.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        stable <stable@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jann Horn <jannh@...gle.com>,
        Kirill Tkhai <ktkhai@...tuozzo.com>, Shaohua Li <shli@...com>,
        Nadav Amit <namit@...are.com>, Linux-MM <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Android Kernel Team <kernel-team@...roid.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        David Hildenbrand <david@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>
Subject: Re: [PATCH 0/5] 4.14 backports of fixes for "CoW after fork() issue"

Hi, Suren,

On Wed, Apr 21, 2021 at 01:01:34PM -0700, Suren Baghdasaryan wrote:
> Peter, you mentioned https://lkml.org/lkml/2020/8/10/439 patch to
> distinguish real writes vs enforced COW read requests, however I also
> see that you had a later version of this patch here:
> https://lore.kernel.org/patchwork/patch/1286506/. Which one should I
> backport? Or is it not needed in the absence of uffd-wp support in the
> earlier kernels?

Sorry I have no ability to evaluate the rest... but according to Linus's
previous reply, my understanding is that it is not needed, not to mention it's
not upstreamed too.

Thanks,

-- 
Peter Xu