linux-kernel - Re: [PATCH] mm: larger stack guard gap, between vmas

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Message-ID: <CA+55aFyY_Nk8Kxm0oJy4+6DY0KnJw2eZUBonb6mEwM0sYDpUew@mail.gmail.com>
Date:   Tue, 4 Jul 2017 09:18:42 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Ben Hutchings <ben@...adent.org.uk>,
        John Haxby <john.haxby@...cle.com>
Cc:     Michal Hocko <mhocko@...nel.org>, Willy Tarreau <w@....eu>,
        Hugh Dickins <hughd@...gle.com>,
        Oleg Nesterov <oleg@...hat.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Rik van Riel <riel@...hat.com>,
        Larry Woodman <lwoodman@...hat.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Tony Luck <tony.luck@...el.com>,
        "James E.J. Bottomley" <jejb@...isc-linux.org>,
        Helge Diller <deller@....de>,
        James Hogan <james.hogan@...tec.com>,
        Laura Abbott <labbott@...hat.com>, Greg KH <greg@...ah.com>,
        "security@...nel.org" <security@...nel.org>,
        linux-distros@...openwall.org,
        Qualys Security Advisory <qsa@...lys.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Ximin Luo <infinity0@...ian.org>
Subject: Re: [PATCH] mm: larger stack guard gap, between vmas

On Tue, Jul 4, 2017 at 4:36 AM, Ben Hutchings <ben@...adent.org.uk> wrote:
>
> That's what I was thinking of.  Tried the following patch:
>
> Subject: mmap: Ignore VM_NONE mappings when checking for space to
>  expand the stack

This looks sane to me.

I'm going to ignore it in this thread, and assume that it gets sent as
a patch separately, ok?

It would be good to have more acks on it.

Also, separately, John Haxby kind of implied that the LibreOffice
regression on i386 is already fixed by commit f4cb767d76cf ("mm: fix
new crash in unmapped_area_topdown()").

Or was that a separate issue?

               Linus