Re: [PATCH 07/11] unpaged: COW on VM_UNPAGED

From: Hugh Dickins
Date: Fri Nov 18 2005 - 04:37:25 EST

On Fri, 18 Nov 2005, David S. Miller wrote:
> If we use MAP_SHARED and let vbetool modify the real BIOS data
> area, resume fails. That's convincing enough for me :)

Yes, I agree with your analysis: I was expecting Dominik's resume
failure to have a more conventional cause, but yes, it's from that
new vbetool actually corrupting the memory instead of using it as
a template.

Right, no warning message then. (Some other time we might want to
withdraw the feature - as you said, they could just read /dev/mem -
and put in a research warning in preparation; but right now I've
had enough of such noise.)

Dominik's Bad page states I'll be thinking about later in the day.

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