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

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Date:   Fri, 3 Mar 2017 17:23:48 +0100
From:   Andrea Arcangeli <aarcange@...hat.com>
To:     Dmitry Vyukov <dvyukov@...gle.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

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?

Thanks!
Andrea