Am 30.10.2014 um 10:27 hat Stefan Hajnoczi geschrieben: > On Thu, Oct 30, 2014 at 10:08:46AM +0100, Max Reitz wrote: > > Also, I like Kevin's proposal/Anthony's approach a lot more because of its > > principle. If a guest can overwrite the beginning of the image so it looks > > like an image format, that's the real bug. Afterwards, anyone will recognize > > that image as non-raw and they'd be correct. > > No, it is not a guest bug.
No, but it is a host bug. When probed, this is not content that raw can reliably store. > The guest may legitimately use raw devices that contain image format > data. Imagine tools similar to libguestfs. > > It's perfectly okay for them to lay out image format data onto a raw > device. > > Probing is the problem, not putting image format data onto a raw device. Agreed, that's why any restrictions only apply when probing was used to detect a raw image. If you want to do anything exotic like storing a qcow2 image for nested virt on a disk that is a raw image in the host, then making sure to pass format=raw shouldn't be too much. Kevin
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