Page Mapping

Kuas (gmane)
2004-04-05T04:01:04Z

Hello,

This might be very trivial question for people in this mailing list. I
need to know if my understanding is correct.

We are doing some experiment with Linux kernel for security. Right now,
we are trying to see some behavior in the Linux memory management. I am
trying to track and possibly scan (for now) all the pages that's just
brought into the memory. I am doing this in i386 arch and Linux kernel
2.4.22.

I think it would be good to do it in: mm/memory.c in do_no_page(). At
the end of the function, I have references to pte_t and page struct of
the fresh new page that's just brought in from disk (not swapped).

This is diagram the diagram I'm going to refer:
http://www.skynet.ie/~mel/projects/vm/guide/html/understand/node24.html

From my understanding from the diagram of Linear Address to Page
conversion (please let me know if I'm correct or misunderstood). The
struct "pte_t->pte_low" an entry if PTE table, is the base 'physical'
address of the page. In this case I can just use it to reference the
page. I can't find any other conversion method to get another address.

Assuming I have that address, can I just direct reference that address
(assuming the address is physical and from kernel mode) or do I have to
use some methods to access the page content?

How do I know the size of the page that's filled though? I can't see
that information from the page struct.

Thanks in Advance for comments and information.

Kuas