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

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Date:   Wed, 5 Jul 2017 12:21:32 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Willy Tarreau <w@....eu>
Cc:     Ben Hutchings <ben@...adent.org.uk>,
        Michal Hocko <mhocko@...nel.org>,
        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 12:18 PM, Willy Tarreau <w@....eu> wrote:
>
> But only if the sysctl is set. It can simply be recommended to set it
> if any program fails. We've done this for many years with other ones
> like min_mmap_addr or tcp_ecn.

Ok, fair enough. I don't hate the approach, and maybe it's simpler
overall, and would help find other potential problem spots.

*Hopefully* it was just that Rust thing and the nasty Java exec-shield
workaround, but yeah, those might just be the first ones that have
been found so far.

                  Linus