linux-kernel - Re: interaction of MADV_PAGEOUT with CoW anonymous mappings?

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Message-ID: <CAG48ez2JKTk8bs0_YcofxUA-oLYdBCWSzGRS2fzBHAQ==dCz5A@mail.gmail.com>
Date:   Fri, 13 Mar 2020 00:29:24 +0100
From:   Jann Horn <jannh@...gle.com>
To:     Minchan Kim <minchan@...nel.org>
Cc:     Michal Hocko <mhocko@...nel.org>, Linux-MM <linux-mm@...ck.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        Daniel Colascione <dancol@...gle.com>,
        Dave Hansen <dave.hansen@...el.com>,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: interaction of MADV_PAGEOUT with CoW anonymous mappings?

On Thu, Mar 12, 2020 at 9:16 PM Minchan Kim <minchan@...nel.org> wrote:
> On Thu, Mar 12, 2020 at 09:22:48AM +0100, Michal Hocko wrote:
> > [Cc akpm]
> >
> > So what about this?
>
> Thanks, Michal.
>
> I't likde to wait Jann's reply since Dave gave his opinion about the vulnerability.
> https://lore.kernel.org/linux-mm/cf95db88-968d-fee5-1c15-10d024c09d8a@intel.com/
> Jann, could you give your insigh about that practically it's possible?

Since I don't really know much about the whole LVI attack, and in
particular don't have any practical experience with it, I don't think
I can help with insight on that. So since Dave said that he doesn't
think it's practical, I'll defer to him on that.