/proc/sys/vm/mmap_min_addr missing

[Baruch Siach]

Hi Valery,

On Mon, Jan 14, 2013 at 11:24:27PM -0800, Valery Reznic wrote:
> > From: shimi <linux-il at shimi.net>
> >To: Valery Reznic <valery_reznic at yahoo.com> 
> >Cc: linux-il <linux-il at cs.huji.ac.il> 
> >Sent: Tuesday, January 15, 2013 6:21 AM
> >Subject: Re: /proc/sys/vm/mmap_min_addr missing
> > 
> >
> >On Mon, Jan 14, 2013 at 11:40 PM, Valery Reznic <valery_reznic at yahoo.com> wrote:
> >
> >Recently I stumbled upon some mystery that I can't understand.
> >>My Google search bring no results.
> >>
> >>I have 3 VM with different Linuxes that run under QEMU and now I noticed that
> >>all of them don't have /proc/sys/vm/mmap_min_addr files (/proc is mounted)
> > 
> >Are you emulating ARM on the guests by any chance?
> I am running Fedora 12 ARM, Fedora Core 3 x86-64, and debian ARM
> I don't remember debian version, but it's ARM OABI

mmap_min_addr first appeared in kernel version 2.6.23, commit ed032189 
(security: Protection for exploiting null dereference using mmap). What kernel 
versions are you running in your virtualized machines?

baruch

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