/proc/sys/vm/mmap_min_addr missing

[Valery Reznic]

----- Original Message -----
> From: Baruch Siach <baruch at tkos.co.il>
> To: Valery Reznic <valery_reznic at yahoo.com>
> Cc: shimi <linux-il at shimi.net>; linux-il <linux-il at cs.huji.ac.il>
> Sent: Tuesday, January 15, 2013 9:33 AM
> Subject: Re: /proc/sys/vm/mmap_min_addr missing
> 
> Hi Valery,
Hi, Baruh
> 
> 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?
My host with Fedora 12 x86-64
Linux Fedora8 2.6.32.26-175.fc12.x86_64 #1 SMP Wed Dec 1 21:39:34 UTC 2010 x86_64 x86_64 x86_64 GNU/Linux

has mmap_min_addr


Fedora 12 ARM with kernel 

uname -a
Linux fedora-arm 2.6.24-rc7 #1 Wed Jan 16 02:28:08 CET 2008 armv5tel armv5tel armv5tel GNU/Linux

has not

Fedora 3 x86-64 with kernel 2.6.9-1.667 also has not mmap_min_addr

Debian ARM OABI I think, has kernel 2.4 (can't check it now)

Valery
> 
> baruch
> 
> -- 
>      http://baruch.siach.name/blog/                  ~. .~   Tk Open Systems
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>