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

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Message-ID: <CAHk-=wiQCrpxGL4o5piCSqJF0jahUUYW=9R=oGATiiPnkaGY0g@mail.gmail.com>
Date:   Wed, 7 Apr 2021 09:07:17 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     Suren Baghdasaryan <surenb@...gle.com>,
        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 6:22 AM Vlastimil Babka <vbabka@...e.cz> wrote:
>
> 1) Ignore the issue (outside of Android at least). The security model of zygote
> is unusual. Where else a parent of fork() doesn't trust the child, which is the
> same binary?

Agreed. I think this is basically an android-only issue (with
_possibly_ some impact on crazy "pin-and-fork" loads), and doesn't
necessarily merit a backport at all.

If Android people insist on using very old kernels, knowing that they
do things that are questionable with those old kernels, at some point
it's just _their_ problem.

                 Linus