Re: [Xen-devel] shadow2 corrupting PV guest state

[Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>]

Hi,

At 16:18 +0900 on 24 Oct (1161706722), Doi.Tsunehisa@xxxxxxxxxxxxxx wrote:
>   In my investigation, get_page() assumes that the page frame is in
> use. But, the page_info structure of released page frame should not
> be treated as inuse. Thus the nd value might be invalid value in this
> situation, I think.

True, but we don't look at nd unless the page is allocated...

>         if ( unlikely((x & PGC_count_mask) == 0) ||  /* Not allocated? */
>              unlikely((nx & PGC_count_mask) == 0) || /* Count overflow? */
>              unlikely(d != _domain) )                /* Wrong owner? */

Cheers,

Tim.

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