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Mapping foreign page into process
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hugo View Drop Down
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Posts: 29 		Post Options Post Options   Quote hugo Quote  Post ReplyReply Direct Link To This Post Topic: Mapping foreign page into process
    Posted: 03 November 2009 at 10:55am
Originally posted by Vernum

That's kind of the problem. I am not the controller. :/
Hmm. But you gave me an idea.
Maybe i can somehow intercept the allocation and create a section instead.
Still, im not very happy with this solution. :/
 
Did you ever get your problem sorted out?
 
Hugo
 
 
Morantex Inc.
http://www.morantex.com
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Vernum View Drop Down
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Posts: 15 		Post Options Post Options   Quote Vernum Quote  Post ReplyReply Direct Link To This Post Posted: 15 September 2009 at 5:10pm
That's kind of the problem. I am not the controller. :/
Hmm. But you gave me an idea.
Maybe i can somehow intercept the allocation and create a section instead.
Still, im not very happy with this solution. :/
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wj32 View Drop Down
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Posts: 704 		Post Options Post Options   Quote wj32 Quote  Post ReplyReply Direct Link To This Post Posted: 14 September 2009 at 11:04pm
If you control the memory allocation, instead of using NtAllocateVirtualMemory/VirtualAlloc you should create a section using NtCreateSection/CreateFileMapping (or whatever it is) and map a view into both processes.
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Vernum View Drop Down
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Posts: 15 		Post Options Post Options   Quote Vernum Quote  Post ReplyReply Direct Link To This Post Posted: 14 September 2009 at 1:13pm
Well i just mean allocated regions of memory with VirtualAlloc().
( MEM_PRIVATE + MEM_COMMIT / MEM_RESERVE)

I want to map one of these allocated regions into another process, simultaneously.

So i can read and write to this memory-region from two process-contexts at the same time. (the processes live in the same session though)

And it doesn't matter if the address-range differs.

I am not really sure if there even is a "proper" way. Worst case scenario would be that i would have to manually manipulate the Page-Tables. Might this be the case here?


Edited by Vernum - 14 September 2009 at 1:18pm
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wj32 View Drop Down
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Posts: 704 		Post Options Post Options   Quote wj32 Quote  Post ReplyReply Direct Link To This Post Posted: 13 September 2009 at 11:14pm
What do you mean by private page? If it was mapped from a section and you have a handle to the section, you can map a view as well. I don't think you can just convert an allocated page for use in a section, though.
MCTS: Windows Internals
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Vernum View Drop Down
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Posts: 15 		Post Options Post Options   Quote Vernum Quote  Post ReplyReply Direct Link To This Post Posted: 13 September 2009 at 6:26pm
Let's say one process has mapped its own private page into his virtual memory.
In my second process i want to map this exact page into my process, too.
But i have no control on how the first process allocated the first page.

Any ideas?
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