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

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Message-ID: <CAJuCfpHa+eydE_voX38V-jtv5J_RnyT=eY12-VmcLbVG_u2dyA@mail.gmail.com>
Date:   Wed, 7 Apr 2021 14:53:49 -0700
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Mikulas Patocka <mpatocka@...hat.com>,
        Vlastimil Babka <vbabka@...e.cz>, Peter Xu <peterx@...hat.com>,
        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"

On Wed, Apr 7, 2021 at 12:23 PM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> On Wed, Apr 7, 2021 at 11:47 AM Mikulas Patocka <mpatocka@...hat.com> wrote:
> >
> > So, we fixed it, but we don't know why.
> >
> > Peter Xu's patchset that fixed it is here:
> > https://lore.kernel.org/lkml/20200821234958.7896-1-peterx@redhat.com/
>
> Yeah, that's the part that ends up being really painful to backport
> (with all the subsequent fixes too), so the 4.14 people would prefer
> to avoid it.
>
> But I think that if it's a "requires dax pmem and ptrace on top", it
> may simply be a non-issue for those users. Although who knows - maybe
> that ends up being a real issue on Android..

A lot to digest, so I need to do some reading now. Thanks everyone!

>
>             Linus