Re: [Xen-devel] Grant access to more than one dom

[Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>]

On 05/08/2014 04:03 PM, Simon Martin wrote:
> Thanks Daniel,
>
>
> > The add_grefs function strings the allocated gntalloc_gref structures onto
> > two linked lists: the list heads are local, but are only used temporarily.
> > If the operation is successful, the list_splice_tail calls wire up the
> > linked lists to permanent structures on the heap; if unsuccessful, they
> > are used to clean up.
> After sending the mail I kind of worked out the what, however the how
> still bugs me. The function list_splice_tail does pointer juggling,
> not allocation, so as far as I can see you just end up with pointers to
> stack variables...
The allocation is done ingref = kzalloc(sizeof(*gref), GFP_KERNEL).  Any
pointers to stack variables are overwritten during the splice.

--
Daniel De Graaf
National Security Agency

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