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[Xen-bugs] [Bug 1250] HVM guest can not boot with Qcow image

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Subject: [Xen-bugs] [Bug 1250] HVM guest can not boot with Qcow image
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Date: Wed, 14 May 2008 23:08:40 -0700
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------- Comment #2 from haicheng.li@xxxxxxxxx  2008-05-14 23:08 -------
Ian Jackson wrote:
> I'm afraid you are using the wrong syntax.
> file:... is for raw images.
> Prior to changeset 17606, the emulated IDE controller would, if the
> specified file looked like a qcow image, interpret it that way - but
> the PV presentation of the same device (via blktap) to the same guest
> would treat it as a raw image.  This (and other related scenarios)
> allows a malicious guest to read any file on the host (including for
> example the host's underlying disk devices), because the qcow image
> format contains the (host) pathname of the backing file.
> In changeset 17606 the behaviour was changed so that file:... always
> treats the specified file as a raw disk image.  To use a file
> containing a qcow image, you have to say tap:qcow:...
> This was discussed here on the list quite recently; feel free to
> comment further if you think the fix is the wrong one.
> Ian.

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