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List:       xen-devel
Subject:    Re: [Xen-devel] Xen 4.0.0x allows for data corruption in Dom0
From:       Joanna Rutkowska <joanna () invisiblethingslab ! com>
Date:       2010-03-09 0:20:57
Message-ID: 4B959469.7000002 () invisiblethingslab ! com
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On 03/09/2010 01:18 AM, James Harper wrote:
>>> I can't think of a Xen failure-mode which would cause these symptoms
>>> without also being massively obvious in other cases.  (But "I can't
>>> think of..." is where all the best bugs hide.)
>>>
>>
>> But the corruptions always happen in 32-bytes chunks, which might
>> suggest it's not a page-related problem (e.g. wrongly re-used page),
> as
>> in that case we would be observing (at least sometimes) much bigger
>> chunks of corrupted data, I think.
> 
> Based on your hex dump output, it appears to be the first 32 bytes of a
> page, which does lend itself to the idea that it's a page allocated for
> something with only the first 32 bytes used.
> 
> You've stated that you are no longer set up to reproduce it, which is
> unfortunate. If you find yourself in a position to try it again there
> are bunch of things you could try to figure out on which end of the copy
> the problem lies.
> 
But everybody can try it with the kernels I provided, right? I'm not the
only one person, who can do this...

j.


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