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Re: [Xen-devel] [PATCH v3 2/2] xsm: hide detailed Xen version from unprivileged guests
- To: Julien Grall <julien@xxxxxxx>
- From: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
- Date: Wed, 22 Jan 2020 11:19:47 +0000
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- Cc: "sergey.dyasli@xxxxxxxxxx >> Sergey Dyasli" <sergey.dyasli@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Doug Goldstein <cardoe@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxx, Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
- Delivery-date: Wed, 22 Jan 2020 11:19:59 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 22/01/2020 10:14, Julien Grall wrote:
>
>
> On 22/01/2020 10:01, Sergey Dyasli wrote:
>> On 20/01/2020 10:01, Jan Beulich wrote:
>>> On 17.01.2020 17:44, Sergey Dyasli wrote:
>>>> v2 --> v3:
>>>> - Remove hvmloader filtering
>>>
>>> Why? Seeing the prior discussion, how about adding XENVER_denied to
>>> return the "denied" string, allowing components which want to filter
>>> to know exactly what to look for? And then re-add the filtering you
>>> had? (The help text of the config option should then perhaps be
>>> extended to make very clear that the chosen string should not match
>>> anything that could potentially be returned by any of the XENVER_
>>> sub-ops.)
>>
>> I had the following reasoning:
>>
>> 1. Most real-world users would set CONFIG_XSM_DENIED_STRING="" anyway.
>>
>> 2. Filtering in DMI tables is not a complete solution, since denied
>> string leaks elsewhere through the hypercall (PV guests, sysfs, driver
>> logs) as Andrew has pointed out in the previous discussion.
>>
>> On the other hand, SMBios filtering slightly improves the situation for
>> HVM domains, so I can return it if maintainers find it worthy.
>
> While I am not a maintainer of this code, my concern is you impose the
> conversion from "denied" to "" to all the users (include those who wants to
> keep "denied").
This is not what's happening here: the default is still "<denied>" (as
per patch 1); but patch 2 makes XENVER_extraversion, XENVER_compile_info
and XENVER_changeset to return "<denied>" instead of the real values
which causes the UI / logs issues.
>
> If you were doing any filtering in hvmloader, then it would be best if this
> is configurable. But this is a bit pointless if you already allow the user to
> configure the string at the hypervisor level :).
--
Thanks,
Sergey
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