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

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Message-ID: <CALCETrWVwkKqiSCQvwn8uyakSzb7wF5Um3=+cejR3PZV1mnCag@mail.gmail.com>
Date:   Thu, 22 Jun 2017 20:10:29 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     Willy Tarreau <w@....eu>
Cc:     Ben Hutchings <ben@...adent.org.uk>,
        Levente Polyak <anthraxx@...hlinux.org>,
        Hugh Dickins <hughd@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        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 7:34 AM, Willy Tarreau <w@....eu> wrote:
> On Thu, Jun 22, 2017 at 03:14:00PM +0100, Ben Hutchings wrote:
>> On Thu, 2017-06-22 at 15:59 +0200, Willy Tarreau wrote:
>> > but I think Ben is currently looking
>> > for feedback on the validity of his backport which was a difficult
>> > task.
>>
>> Right.
>
> Ben, barring more feedback, I think your should put your patch to your
> stable queue so that Guenter can run his build+boot tests. They managed
> to spot a few issues in my patches and that will make you more confident
> regarding the whole architectures coverage.
>

Has anyone checked how grsecurity deals with this?  I think they have
a large stack guard gap.

--Andy