[Asm] how to see if a region of memory is executable?

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hi all

i want to do an inline asm and i want to see if a given location of memory is non-writable-executable code or its writable data; if its data, skip the overwrite.
i want to do it in pure asm + win api.

i partially achieved it by checking if I'm in code section or not. but it seems even there, there are some locations that are meant to be used as data and fiddling with them will cause access violation.
i want to do it in a more advanced, flawless, way.

thanks in advance.

What I have tried:

googling
trying base-offset to detect sections of the target exe file

Posted 17-Sep-22 18:21pm

reverser69

Updated 8-Oct-22 21:04pm

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Richard MacCutchan 18-Sep-22 3:29am

It is very difficult to figure out such things without access to the source, since you cannot guarantee to find the start of any code section.

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merano99 · Answer 1 · 2022-10-08T21:04:00

Solution 1

Access to main memory is usually realized with an MMU. Since the MMU is a critical resource, the operating system takes care of it. Access to the MMU requires operating system rights and good hardware knowledge. If you had access to the MMU, you could certainly also change rights. Furthermore, an MMU manages the memory with a minimum block size.

Posted 8-Oct-22 21:04pm

merano99

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reverser69 11-Oct-22 12:20pm

could you please provide some more keywords?
googling MMU is not yielding any related information.

merano99 11-Oct-22 16:16pm

https://en.wikipedia.org/wiki/Memory_management_unit

[Asm] how to see if a region of memory is executable?

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[Asm] how to see if a region of memory is executable?

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