Messages in this thread | | | Date | Sun, 10 Jun 2012 21:11:30 +0200 | From | "Hans J. Koch" <> | Subject | Re: [PATCH] uio_pci_generic does not export memory resources |
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On Sun, Jun 10, 2012 at 10:00:36PM +0300, Michael S. Tsirkin wrote: > > One thing I stand corrected on: assigning a PF that does DMA with VFIO > *might* be secure, and sometimes, maybe often, is. > There's just no way to make sure. > This is unlike uio_pci_generic where it would always be insecure.
You need to be root to access a UIO device, and if you're root, you can compromise a system in many ways. Before UIO, people used /dev/mem for similar purposes, and UIO is certainly a seccurity improvement over that.
But of course, UIO presents security risks. Like many other things below /dev, you need to know what you're doing, and who gets access to /dev/uioX.
Thanks, Hans
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