Re: [Xen-devel] [PATCH] libxc: check in xc_get_tot_pages() that the proper domain is reported

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Tue, Dec 02, 2014 at 04:04:44PM +0000, Wei Liu wrote:
> On Tue, Dec 02, 2014 at 04:18:08PM +0100, Vitaly Kuznetsov wrote:
> > XEN_DOMCTL_getdomaininfo, which is being used by xc_domain_getinfo(), has
> > strange interface: it reports first domain which has domid >= requested 
> > domid
> > so all callers are supposed to check that the proper domain(s) was queried
> > by checking domid. xc_get_tot_pages() doesn't do that. In case the requested
> > domain was destroyed it will report first domain with domid > requested 
> > domid
> > which is apparently misleading as there is no way xc_get_tot_pages() callers
> > can figure out that they got tot_pages for some other domain.
> > 
> > Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
> 
> Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>

Lets add another Ack to this party..

Release-Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> 
> > ---
> >  tools/libxc/xc_private.c | 6 ++++--
> >  1 file changed, 4 insertions(+), 2 deletions(-)
> > 
> > diff --git a/tools/libxc/xc_private.c b/tools/libxc/xc_private.c
> > index 1c214dd..e2441ad 100644
> > --- a/tools/libxc/xc_private.c
> > +++ b/tools/libxc/xc_private.c
> > @@ -613,8 +613,10 @@ int xc_get_pfn_list(xc_interface *xch,
> >  long xc_get_tot_pages(xc_interface *xch, uint32_t domid)
> >  {
> >      xc_dominfo_t info;
> > -    return (xc_domain_getinfo(xch, domid, 1, &info) != 1) ?
> > -        -1 : info.nr_pages;
> > +    if ( (xc_domain_getinfo(xch, domid, 1, &info) != 1) ||
> > +         (info.domid != domid) )
> > +        return -1;
> > +    return info.nr_pages;
> >  }
> >  
> >  int xc_copy_to_domain_page(xc_interface *xch,
> > -- 
> > 1.9.3
> 
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