linux-kernel - Re: [PATCH] mm: mm, mmap: do not blow on PROT_NONE MAP

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Message-ID: <CA+55aFxxeCtZ-PBqrZK5K2nDjCFBWRMKE09Bz650ZiR2h=b8dg@mail.gmail.com>
Date:   Wed, 5 Jul 2017 10:43:27 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Ben Hutchings <ben@...adent.org.uk>, Willy Tarreau <w@....eu>,
        Oleg Nesterov <oleg@...hat.com>,
        Rik van Riel <riel@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>, Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH] mm: mm, mmap: do not blow on PROT_NONE MAP_FIXED holes in
 the stack

On Wed, Jul 5, 2017 at 9:56 AM, Michal Hocko <mhocko@...nel.org> wrote:
>
> "mm: enlarge stack guard gap" has introduced a regression in some rust
> and Java environments which are trying to implement their own stack
> guard page.  They are punching a new MAP_FIXED mapping inside the
> existing stack Vma.

Hmm. What version is this patch against? It doesn't seem to match my 4.12 tree.

                 Linus