mmap to fixed adr
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
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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Volker Poplawski