linux-kernel - Re: [PATCH] mm/userfaultfd: fix memory corruption due to writeprotect

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Message-ID: <X+OSk8Ri8my5uXtZ@redhat.com>
Date:   Wed, 23 Dec 2020 13:55:15 -0500
From:   Andrea Arcangeli <aarcange@...hat.com>
To:     Peter Xu <peterx@...hat.com>
Cc:     Yu Zhao <yuzhao@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Nadav Amit <nadav.amit@...il.com>,
        linux-mm <linux-mm@...ck.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Pavel Emelyanov <xemul@...nvz.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        stable <stable@...r.kernel.org>,
        Minchan Kim <minchan@...nel.org>,
        Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] mm/userfaultfd: fix memory corruption due to writeprotect

On Wed, Dec 23, 2020 at 01:51:59PM -0500, Andrea Arcangeli wrote:
> NOTE: about the above comment, that mprotect takes
> mmap_read_lock. Your above code change in the commit above, still has
       ^^^^ write

Correction to avoid any confusion.