Linux Driver: Copy memory from different user-process

Question

At the moment I try to write a memory-hacking library for Unix. But I faced so many problems using ptrace/procfs so I decided to write a driver for that.

The problem is, I am unable to find a way to retrieve memory from a different virtual memory space (I only know copy_from_user() etc) than of the caller.

Does anyone know a good solution? Thanks :)

Regards, Flo

ptrace is messy but it is the approved way to mess around with other processes. Are you sure you cannot learn how to use it? — Zan Lynx
– Zan Lynx, Commented Apr 8, 2011 at 13:55
I know how to use ptrace, my problem is that I am forced to stop the process I am operating on to be able to read from /proc/[pid]/mem or write to it. Stopping a process to copy a few 100MB just creates an unacceptable delay. I know there's are reason the process has to be stopped, but in my case I don't have any issues with race-conditions or similar. — Flo
– Flo, Commented Apr 8, 2011 at 14:12

ZelluX · Accepted Answer · 2011-04-11 17:16:22Z

2

You may map virtual memory pages from the two different memory spaces into kernel space, do a copy operation in the kernel address space, and then unmap the pages.

answered Apr 11, 2011 at 17:16

ZelluX

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