Re: [Xen-devel] [PATCH v1 1/6] docs: add feature document for Xen hypervisor sysfs-like support

[Jürgen Groß <jgross@xxxxxxxx>]

On 30.09.19 12:07, Ian Jackson wrote:
> Jürgen Groß writes ("Re: [PATCH v1 1/6] docs: add feature document for Xen 
> hypervisor sysfs-like support"):
> > On 30.09.19 10:57, Jan Beulich wrote:
> > > On 30.09.2019 10:17, Jürgen Groß wrote:
> > > > .config can contain user supplied strings. While not making much sense
> > > > to have unprintable characters in there I don't see how to prevent them.
> > > Does / can't kconfig reject them?
> > Right now it doesn't.
> >
> > I tested that by manually modifying my .config and then doing a make.
> > The (wrong) .config was accepted and the hypervisor built with it.
> Urgh.
>
> I think that either
>
> (A) this needs to be prevented somehow, or
Difficult, as we inherit kconfig from the Linux kernel.

> (B) your userland tools, at the very least, need souping up so that
> they (i) by default do not risk spamming the user's terminal with
> binary gibberish which someone stored in xenhypfs (ii) can be used to
> reliably extract any binary objects which have been stored.
>
> I think (B)(i) necessarily involves some kind of quoting scheme :-/.
> (B)(ii) means the quoting needs to be turn-off-able.
Yes, this seems to be a sensible thing to do.


Juergen


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