linux-kernel - Re: mm: use-after-free in zap_page

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Message-ID: <CACT4Y+ZzkZ0xQRmqZLBMHs2h169uffiXD17b-UaK_vwL6vZGtw@mail.gmail.com>
Date:   Wed, 8 Mar 2017 13:51:45 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Andrea Arcangeli <aarcange@...hat.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: mm: use-after-free in zap_page_range

On Fri, Mar 3, 2017 at 5:23 PM, Andrea Arcangeli <aarcange@...hat.com> wrote:
> Hello Dmitry,
>
> On Fri, Mar 03, 2017 at 02:54:26PM +0100, Dmitry Vyukov wrote:
>> The following program triggers use-after-free in zap_page_range:
>> https://gist.githubusercontent.com/dvyukov/b59dfbaa0cb1e5231094d228fa57c9bd/raw/95c4da18cb96f8aaa47c10012d8c4484fd5917ad/gistfile1.txt
>
> I posted the fix for this one yesterday (found while doing more code
> reviews of the upstream code searching for any other potential issue):
>
> https://www.spinics.net/lists/linux-mm/msg122905.html
> https://www.spinics.net/lists/linux-mm/msg122903.html
>
> Could you test with those two applied on top of the others updates
> that are already in -mm?

This is already in mmotm/auto-latest, so we are testing it.