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How does dbvm work?

 
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Euphoria133
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PostPosted: Thu Apr 14, 2022 10:46 am    Post subject: How does dbvm work? Reply with quote
I find it fascinating it works when even kernelmode fails.

Why/how can it work when other debuggers don’t work?
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Csimbi
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PostPosted: Thu Apr 14, 2022 11:14 am    Post subject: Reply with quote
Because Dark Byte is smart?
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Dark Byte
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PostPosted: Thu Apr 14, 2022 2:23 pm    Post subject: Reply with quote
it marks the memory as unreadable/unwritable, and when the cpu tries to do something it gets caught and recorded, then marked as full access for one single step just for that cpu, and then restored back to unreadable/unwritable

it doesn't use debug registers
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Euphoria133
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PostPosted: Fri Apr 15, 2022 5:43 pm    Post subject: Reply with quote
Dark Byte wrote:
it marks the memory as unreadable/unwritable, and when the cpu tries to do something it gets caught and recorded, then marked as full access for one single step just for that cpu, and then restored back to unreadable/unwritable

it doesn't use debug registers


Aha, this explanation helped me understand. I will take a look 👀 at the source code as well to understand the code behind it

Thanks
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