Re: Xen Security Advisory 84 - integer overflow in several XSM/Flask hypercalls

["Jan Beulich" <JBeulich () suse com>]

> > > On 06.02.14 at 18:23, <cve-assign () mitre org> wrote:
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> We can provide the three CVE assignments for XSA-84 (as well as the
> one CVE assignment for XSA-85 and the one CVE assignment for XSA-86).
> However, could you please clarify:
>
> > http://xenbits.xen.org/xsa/advisory-84.html 
>
> > UPDATES IN VERSION 2
> > ====================
> >
> > Public release.
> >
> > The patch for 4.1 was extended to cover a few further similar issues.
>
> Here, was the original scope of "The patch for 4.1" (before it was
> extended) exclusively:
>
>   "a different overflow issue on FLASK_{GET,SET}BOOL and expose
>    unreasonably large memory allocation to arbitrary guests"
>
> ? Or do you mean that, originally, the "patch for 4.1" addressed
> another vulnerability, and this "different overflow issue" was one of
> the version-2 extensions to the scope of XSA-84?

The original patch was dealing with just the unbounded memory
allocation. The missing bounds checking was what the incremental
addition dealt with.

Jan