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From: John Baldwin <jhb@freebsd.org>
To: freebsd-arch@freebsd.org
Subject: Re: mmap and resource limits
Date: Fri, 12 Oct 2012 13:38:28 -0400
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 (bigwig.baldwin.cx); Fri, 12 Oct 2012 13:43:23 -0400 (EDT)
Cc: Marcel Moolenaar <marcel@xcllnt.net>
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On Friday, October 12, 2012 12:04:19 pm Marcel Moolenaar wrote:
> 
> On Oct 8, 2012, at 10:40 AM, Marcel Moolenaar <marcel@xcllnt.net> wrote:
> 
> > All,
> > 
> > What's the progress of mmap(2) doing resource accounting and
> > it respecting resource limits?
> 
> *silence*
> 
> Ok, so no new progress. We're still not doing it and we don't
> have an idea of how we want to do it if or when we're going to
> want to do it. Consequently: we still need brk()/sbrk().
> 
> Correct assessment?

Well.  You can use RLIMIT_AS, but that includes anything you map, not just 
malloc().  The problem is that even if you use sbrk() and rely on RLIMIT_DATA, 
any misbehaving app can just use mmap(MAP_ANON) or shm_open() to get around 
that.

-- 
John Baldwin