Re: [PATCH v7 08/12] xen: add /buildinfo/config entry to hypervisor filesystem

[Jan Beulich <jbeulich@xxxxxxxx>]

On 27.04.2020 18:25, George Dunlap wrote:
> If Jan is OK with it simply being outside CONFIG_EXPERT, then great.  But if 
> he insists on some kind of testing for it to be outside of CONFIG_EXPERT, 
> then again, the people who want it to be security supported should be the 
> ones who do the work to make it happen.

I don't understand this part, I'm afraid: Without a config option,
the code is going to be security supported as long as it doesn't
get marked otherwise (experimental or what not). With an option
depending on EXPERT, what would become security unsupported is the
non-default (i.e. disabled) setting. There's not a whole lot to
test there, it's merely a formal consequence of our general rules.
(Of course, over time dependencies of other code may develop on
the information being available e.g. to Dom0 userland. Just like
there's Linux userland code assuming the kernel config is
available in certain ways [I don't necessarily mean the equivalent
of hypfs here], to then use it in what I'd call abusive ways in at
least some cases.)

Jan