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Re: [Xen-devel] [PATCH v2 10/13] libx86: introduce a helper to deserialise msr_policy objects


  • To: Jan Beulich <JBeulich@xxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Tue, 17 Jul 2018 17:06:35 +0100
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  • Cc: Ian Jackson <Ian.Jackson@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxx>, Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
  • Delivery-date: Tue, 17 Jul 2018 16:07:19 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 17/07/18 13:01, Jan Beulich wrote:
>>>> +                goto err;
>>>> +
>>>> +            p->plaform_info.raw = data.val;
>>> No other sanity checking?
>> Correct.  This is a data marshalling function, not an auditing function.
>>
>> The auditing functions are also needed for in-place modification to an
>> existing policy.
> Right, but the primary problem with understanding whether the lack
> of checking here is a problem is the lack of a caller of this function.

The reason there is no caller is because you objected to my stub
implementation in v1.

This marshalling support is currently blocking other work, which is why
I've split it out, to allow development to continue in parallel.

> As I think I did say in the earlier reply - it matters quite a bit where p
> points.

No - it doesn't.  This is a function to convert data between two binary
representations, as is explained by its documentation.

Auditing the contents of the data would a) need to happen in combination
with a cpuid_policy object, and b) would be a layering violation.

~Andrew

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