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Re: [Xen-devel] [PATCH] xsm: hide detailed Xen version from unprivileged guests
- To: Jan Beulich <jbeulich@xxxxxxxx>, Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 19 Dec 2019 23:15:16 +0000
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Wei Liu <wl@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxx, Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
- Delivery-date: Thu, 19 Dec 2019 23:15:37 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 19/12/2019 11:35, Jan Beulich wrote:
>>>> XENVER_changeset
>>>> XENVER_commandline
>>>> XENVER_build_id
>>>>
>>>> Return a more customer friendly empty string instead of "<denied>"
>>>> which would be shown in tools like dmidecode.>
>>> I think "<denied>" is quite fine for many of the original purposes.
>>> Maybe it would be better to filter for this when populating guest
>>> DMI tables?
>> I don't know how DMI tables are populated, but nothing stops a guest
>> from using these hypercalls directly.
> And this is precisely the case where I think "<denied>" is better
> than an empty string.
"<denied>" was a terrible choice back when it was introduced, and its
still a terrible choice today.
These are ASCII string fields, and the empty string is a perfectly good
string. Nothing is going to break, because it would have broken the
first time around.
The end result without denied sprayed all over this interface is much
cleaner overall.
~Andrew
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