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

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Date:   Wed, 7 Apr 2021 12:22:41 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Mikulas Patocka <mpatocka@...hat.com>
Cc:     Suren Baghdasaryan <surenb@...gle.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 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..

            Linus