Reading another process memory?

[Mohamed El Dawy <msdawy@gmail.com>]

Hi,
 How are you? I hope you are fine.

I am trying to write  a function that involves reading other processes
memory.
Here is what I can do

1. traverse the linked list of running processes searching for the
required pid
2. Follow the "mm" pointer to get the mm_struct
3. Traverse the "mmap" linked list in that mm_struct to get a list of
all ranges of addresses
3b. And read the "pgd" field too in the mm_sturct which contains the
page directory

Now, I have the page directory, and some logical addresses. Now comes
the tricky part, how can I actually read the memory? I am not really
sure how to read an address given a page directory and a logical
address. Do I need to translate it myself? Are there any functions to
do the job for me?

Thanks a lot in advacne
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