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Dark Byte Site Admin Reputation: 458
Joined: 09 May 2003 Posts: 25288 Location: The netherlands
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Posted: Wed Dec 12, 2018 3:09 pm Post subject: |
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The driver allocates physical memory, puts dbvm in there, and then forgets about it (basically a memory leak)
Then it saves the current state of the cpu , saves it to dbvm, and then exits windows and launches dbvm
It never returns from that, but dbvm will run a virtual machine based on the saved state of the cpu right before it exited windows.
anyhow, when the driver gets unloaded the physical memory it allocated for dbvm should not be freed by windows (it's a low level alloc and not specifically linked to the driver) and therefor will not be reused by anything else
of course, if you boot up with dbvm it will tell windows that the memory it's in belongs to the system firmware so windows won't touch it either
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predprey Master Cheater Reputation: 24
Joined: 08 Oct 2015 Posts: 486
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Posted: Wed Dec 12, 2018 3:12 pm Post subject: |
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OldCheatEngineUser wrote: | Dark Byte wrote: | DBVM does not need the driver to keep live |
so how can you turn VM mode on? i thought it requires some kernel-mode code for virtualization. (OS virtualization)
or you meant it runs the driver to set the VM mode, and then unloads it? (but if so how it could operate normally when the driver is unloaded) |
I would think the kernel routines are separate from DBVM. They are not the same thing or part thereof. E.g. CE kernel routines require the dbk64.sys driver to be loaded but it does not need DBVM, and while using DBVM we are not restricted to only using kernel routines. In software engineering terms I guess it would be more appropriate to call it an association than a composition or aggregation.
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