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

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Date:   Thu, 22 Jun 2017 21:42:58 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Willy Tarreau <w@....eu>, Ben Hutchings <ben@...adent.org.uk>,
        Levente Polyak <anthraxx@...hlinux.org>,
        Hugh Dickins <hughd@...gle.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Michal Hocko <mhocko@...nel.org>,
        "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>,
        stable <stable@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [vs-plain] Re: [PATCH] mm: larger stack guard gap, between vmas

On Thu, Jun 22, 2017 at 8:10 PM, Andy Lutomirski <luto@...nel.org> wrote:
>
> Has anyone checked how grsecurity deals with this?  I think they have
> a large stack guard gap.

Don't bother with grsecurity.

Their approach has always been "we don't care if we break anything,
we'll just claim it's because we're extra secure".

The thing is a joke, and they are clowns. When they started talking
about people taking advantage of them, I stopped trying to be polite
about their bullshit.

Their patches are pure garbage.

                  Linus