Date: Thu, 22 Jun 2017 15:10:34 +0200
From: Willy Tarreau <w@1wt.eu>
To: Ben Hutchings <ben@decadent.org.uk>
Cc: Hugh Dickins <hughd@google.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Oleg Nesterov <oleg@redhat.com>, Michal Hocko <mhocko@kernel.org>,
        "Jason A. Donenfeld" <Jason@zx2c4.com>, Rik van Riel <riel@redhat.com>,
        Larry Woodman <lwoodman@redhat.com>,
        "Kirill A. Shutemov" <kirill@shutemov.name>,
        Tony Luck <tony.luck@intel.com>,
        "James E.J. Bottomley" <jejb@parisc-linux.org>,
        Helge Diller <deller@gmx.de>, James Hogan <james.hogan@imgtec.com>,
        Laura Abbott <labbott@redhat.com>, Greg KH <greg@kroah.com>,
        security@kernel.org, linux-distros@vs.openwall.org, qsa@qualys.com,
        stable <stable@vger.kernel.org>, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] mm: larger stack guard gap, between vmas
Message-ID: <20170622131034.GF22510@1wt.eu>
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On Thu, Jun 22, 2017 at 01:58:11PM +0100, Ben Hutchings wrote:
> On Thu, 2017-06-22 at 14:46 +0200, Willy Tarreau wrote:
> > On Thu, Jun 22, 2017 at 01:30:45PM +0100, Ben Hutchings wrote:
> > > Here's my attempt at a backport to 3.2.??This is only tested on
> > > x86_64 and I think I should introduce local variables for
> > > vma_start_gap() in a few places.??I had to cherry-pick commit
> > > 09884964335e "mm: do not grow the stack vma just because of an overrun
> > > on preceding vma" before this one (which was a clean cherry-pick).
> > 
> > Ben, I can't apply it on top of 3.2.89 + the patch above, do you have
> > any other patch in your local branch ? For example the patch tries to
> > modify a hunk starting at line 183 of arch/arm/mm/mmap.c while the one
> > I'm having here ends at line 159.
> 
> Sorry, yes, I did this on top of the Debian 3.2 branch and that *does*
> have a patch to arch/arm/mm/mmap.c that I had forgotten about (commit
> 7dbaa466780a "ARM: 7169/1: topdown mmap support").  I think you can
> just drop the changes in ARM's arch_get_unmapped_area_topdown().

Thanks, I've just applied this one and it's building now. I'll run the
same checks I did for 3.10.

Willy