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

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Message-ID: <CA+55aFw9=uJUw1L918OU=+sH1vzK0U3Y52V=9k10xsGKjFLvSQ@mail.gmail.com>
Date:   Wed, 5 Jul 2017 17:47:44 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Michal Hocko <mhocko@...nel.org>,
        Ben Hutchings <ben@...adent.org.uk>, 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>,
        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 Wed, Jul 5, 2017 at 5:31 PM, Andy Lutomirski <luto@...nel.org> wrote:
>
> I wonder if we could pull some "sane" values out of our arses and have
> it work just fine.

That approach may work, but it's pretty nasty.

But together with at least some way for the distro to set the values
we pick, it would probably be fairly reasonable.

You're right that most of the rlimits are just not very useful.

           Linus