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Windows Forum / Virtual PC / May 2008Really safe testing in Virtual Machine ?
I am using Window vista ultimate editon to be a host computer, i want to setup a virtual pc 2007 sp1 and create a vhd image (also vista ultimate editon) to be a Virtual Machine . I am working with C# and developing a tweak tool for vista, it would change the registry, Local variable (System temp folder, Page file size etc...) ,but i will to ensure 1 thing. When do some harmful job on Virtual Machine , is it possible affect my Host computer (real computer) ? And what i need to beware to prevent virtual machine affect my host computer (real computer)? > When do some harmful job on Virtual Machine , is it possible affect my > Host > computer (real computer) ? And what i need to beware to prevent virtual > machine affect my host computer (real computer)? There are two fundamental issues here. Firstly, a virtual machine is a *REAL* machine. Just as real as a physical machine. The fact that it's made of software instead of hardware is completely irrelevant. Secondly, as far as the software running on a virtual machine is concerned, it is a totally separate machine. It doesn't even know that it's running on a virtual machine, because it has no need to know that. That's why e.g. if a virtual machine has Internet access it's absolutely vital to install anti-malware software on it - they host won't protect it. Think of the host and guest as two entirely different machines. Can two entirely different machines talk to each other? Of course they can, if you allow them to do so via networking. If you don't, then they can't. You say that you're writing a C# utility which will tweak a machine's registry. If you've got this far, then I'm sure you know that it's easy enough to write a C# utility which can tweak another machine's registry - but you as the programmer will have to allow it to do so. If you design your utility so that the only registry to which it has access is the registry of the machine on which it is currently running, then you have nothing to worry about...  SignatureMark Rae ASP.NET MVP http://www.markrae.net This post is interest for me. "The Virtual Machine don't know it's running on a virtual machine" So, is it impossible transfer file or some read/write access between "Virtual PC" and Host PC's File System? Signature"Mark Rae [MVP]" <mark@markNOSPAMrae.net> 撰寫於郵件新聞:uC4g6HBvIHA.4952@TK2MSFTNGP05.phx.gbl... > When do some harmful job on Virtual Machine , is it possible affect my > Host > computer (real computer) ? And what i need to beware to prevent virtual > machine affect my host computer (real computer)? There are two fundamental issues here. Firstly, a virtual machine is a *REAL* machine. Just as real as a physical machine. The fact that it's made of software instead of hardware is completely irrelevant. Secondly, as far as the software running on a virtual machine is concerned, it is a totally separate machine. It doesn't even know that it's running on a virtual machine, because it has no need to know that. That's why e.g. if a virtual machine has Internet access it's absolutely vital to install anti-malware software on it - they host won't protect it. Think of the host and guest as two entirely different machines. Can two entirely different machines talk to each other? Of course they can, if you allow them to do so via networking. If you don't, then they can't. You say that you're writing a C# utility which will tweak a machine's registry. If you've got this far, then I'm sure you know that it's easy enough to write a C# utility which can tweak another machine's registry - but you as the programmer will have to allow it to do so. If you design your utility so that the only registry to which it has access is the registry of the machine on which it is currently running, then you have nothing to worry about... SignatureMark Rae ASP.NET MVP http://www.markrae.net > This post is interest for me. > > "The Virtual Machine don't know it's running on a virtual machine" I didn't actually say that. I said that the *software* (operating system and applications) running on a virtual machine doesn't know that it's running on a virtual machine as opposed to a physical machine because it has no need to know that... > So, is it impossible transfer file or some read/write access between > "Virtual PC" and Host PC's File System? I didn't say that either... SignatureMark Rae ASP.NET MVP http://www.markrae.net |
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