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

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Message-ID: <1499257606.2707.39.camel@decadent.org.uk>
Date:   Wed, 05 Jul 2017 13:26:46 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        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, 2017-07-04 at 09:18 -0700, Linus Torvalds wrote:
> > 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?

They are separate issues.

Ben.

-- 
Ben Hutchings
Anthony's Law of Force: Don't force it, get a larger hammer.


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