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Re: Building domains as a lesser user (was Re: [Xen-devel] boot loaders for domain != 0)

Jacob Gorm Hansen wrote:

I would disagree that the trusted loader is a point of failure. It is not trusted in the sense that we need to trust its code to behave correctly, all we need is to trust it as not being malformed data that can trigger an exploit in the domain builder, and of course it is not, given that it is supplied by you the admin and not by a (potentially hostile) user.

Well, it's not the same as trusting a Domain's filesystem to be proper. But it still requires trusting that there are no exploitable bugs in the software.

Using a lesser-user to create the domain within Domain-0 requires trusting there are no exploitable bugs in the kernel syscall interfaces.

So, it's a point of failure as much as Linux is.

Anyway, this code is already written for Xen 1.3. You can find it at http://www.diku.dk/~jacobg/self-migration/

Awesome! This is pretty cool stuff. Do you have plans to update for Xen 2.0/Linux 2.6? Kernel-driven migration seems like an appealing topic.



Anthony Liguori

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