On Wed, Sep 28, 2005 at 01:59:48PM +0200, Blaisorblade wrote:
> That wasn't the original reason - this is fine too, but as I explained in the
> other mail, cat /dev/kmem will cause a copy_to_user() with invalid kernel
> ("from") address. I remember because I discussed this with you at length.
Oh yeah. I was thinking there was a different (and better) reason, but I
couldn't remember what it was.
Also, my reason isn't that good anyway. I had a different fix a while ago,
but it got lost somewhere. I added an arch hook to get_free_pages which
touched each allocated page under the cover of a setjmp. If a page couldn't
be allocated on the host, then it is put on a "bad pages" list, and another
page is allocated instead.
Jeff
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