* mmap to fixed adr
@ 2011-06-19 12:02 Volker Poplawski
2011-06-19 15:14 ` Mulyadi Santosa
0 siblings, 1 reply; 2+ messages in thread
From: Volker Poplawski @ 2011-06-19 12:02 UTC (permalink / raw)
To: kernelnewbies
Hi,
is there a VA range in userspace which is always safe for mmap() with
fixed adr? (x86_64 mostly)
I.e. a VA range where mmap() or ld will never map memory.
I know I can try particular fixed adr with mmap() and check if the
mapping succeeds. However this is not what I want. I want mmap() to stay
clear of certain ranges and map memory there myself.
Regards
.....Volker
^ permalink raw reply [flat|nested] 2+ messages in thread
* mmap to fixed adr
2011-06-19 12:02 mmap to fixed adr Volker Poplawski
@ 2011-06-19 15:14 ` Mulyadi Santosa
0 siblings, 0 replies; 2+ messages in thread
From: Mulyadi Santosa @ 2011-06-19 15:14 UTC (permalink / raw)
To: kernelnewbies
On Sun, Jun 19, 2011 at 19:02, Volker Poplawski <volker@openbios.org> wrote:
> Hi,
>
> is there a VA range in userspace which is always safe for mmap() with
> fixed adr? (x86_64 mostly)
>
> I.e. a VA range where mmap() or ld will never map memory.
likely, you can find it out by yourself using:
cat /proc/self/maps | head
there you can find where kernel maps the very first object. Then, IMO,
all you need to do is preceed that address. Beware, IMHO, don't start
with address 0 as you might screw NULL handler.
--
regards,
Mulyadi Santosa
Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com
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