help needed to do mmap

[Prabhu nath]

>From linux version 2.26.* onwards there is a filter provided by the default
kernel configuration disabling the users from accessing the ram area. There
was a lengthy discussion on the same topic in this mailing list 2 years
back-
http://www.spinics.net/lists/newbies/msg41020.html
If you still want to access the RAM you disable this option in the kernel
configuration menu. *kernel hacking -> Filter access to /dev/mem*.

*Disclaimer:* You will be responsible for the integrity of the RAM contents
:)



On Fri, Apr 19, 2013 at 12:11 PM, er krishna <erkrishna at gmail.com> wrote:

> Root user and trying to acess physical ram reason. I wanted to know is
> there any limit for mmap through use space and how to override them.
>
> Krish
>
>
> On Fri, Apr 19, 2013 at 12:09 PM, Prabhu nath <gprabhunath at gmail.com>wrote:
>
>> Is this address (0xB202E7000) a memory address or device address ?. R you
>> working as privileged user or a normal user. ?
>>
>>
>> On Fri, Apr 19, 2013 at 11:50 AM, er krishna <erkrishna at gmail.com> wrote:
>>
>>> Hi All,
>>>
>>> I am trying to do mmap from user space program to fetch physical memory
>>> base address B202E7000 and size F0. But I am getting operation not
>>> permitted error. Any suggestion by which I can increase the privilage by
>>> sysctl to acess this reason ?
>>>
>>> Krishna
>>>
>>>
>> --
>> Regards,
>> Prabhunath G
>> Linux Trainer
>> Bangalore
>>
>
>


-- 
Regards,
Prabhunath G
Linux Trainer
Bangalore
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