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Splitting page into multiple sub pages?

 
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dnsi0
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Joined: 04 Jan 2007
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PostPosted: Wed Mar 20, 2013 11:06 pm    Post subject: Splitting page into multiple sub pages? Reply with quote
Say I have a large page of allocated memory:

0x00401000 - 0x01000000

And it has the protection PAGE_EXECUTE_READWRITE but I want to only make part of the page PAGE_EXECUTE_READWRITE and part of the page PAGE_EXECUTE_READONLY

0x00401000-0x00700000 - PAGE_EXECUTE_READWRITE
0x00700000-0x01000000 - PAGE_EXECUTE_READONLY

is this possible? can I separate a page into two discrete pages where I can use virtualprotect on?
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Zerith
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Joined: 07 Oct 2007
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PostPosted: Thu Mar 21, 2013 4:08 am    Post subject: This post has 1 review(s) Reply with quote
The range of pages you are speaking of (0x00401000 - 0x01000000) is not a single page, but a range of pages having identical protection attributes.
The size of a single page in bytes is constant, and this size information can be retrieved using GetSystemInfo.

You can change the protection of a region of consecutive pages using VirtualProtect.
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dnsi0
I post too much
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Joined: 04 Jan 2007
Posts: 2674
PostPosted: Thu Mar 21, 2013 5:14 am    Post subject: Reply with quote
Zerith wrote:
The range of pages you are speaking of (0x00401000 - 0x01000000) is not a single page, but a range of pages having identical protection attributes.
The size of a single page in bytes is constant, and this size information can be retrieved using GetSystemInfo.

You can change the protection of a region of consecutive pages using VirtualProtect.


Ahhh I see what you mean. Each page is only 0x1000 bytes long. The reason I thought it was one page was because I viewed the pages in cheatengine and cheatengine said it was a continuous page of that many bytes. But if I call virtualprotect on a region it doesn't affect the rest.

Thanks.
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