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

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Message-ID: <1498140840.2655.28.camel@decadent.org.uk>
Date:   Thu, 22 Jun 2017 15:14:00 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     Willy Tarreau <w@....eu>, Levente Polyak <anthraxx@...hlinux.org>
Cc:     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, linux-distros@...openwall.org, 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, 2017-06-22 at 15:59 +0200, Willy Tarreau wrote:
> Hi,
> 
> On Thu, Jun 22, 2017 at 03:15:51PM +0200, Levente Polyak wrote:
> > Just a side note, but i think its worth mentioning to also have
> > look at
> > these fixup patches:
> > 
> > 
> > -- mm: fix new crash in unmapped_area_topdown()
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/
> > commit/?id=f4cb767d76cf7ee72f97dd76f6cfa6c76a5edc89
> 
> As I mentionned in another mail (this thread starts to be huge), this
> one seems to have already been included in Ben's backport.

That code was completely replaced due to the lack of an rbtree for gaps
in 3.2, so the fix was not needed.

> > -- Allow stack to grow up to address space limit
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/
> > commit/?id=bd726c90b6b8ce87602208701b208a208e6d5600
> 
> This one cleanly applies after, but I think Ben is currently looking
> for feedback on the validity of his backport which was a difficult
> task.

Right.

Ben.

-- 
Ben Hutchings
Sturgeon's Law: Ninety percent of everything is crap.


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