Re: [Xen-devel] Xen fixes for 3.10.y

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

On Fri, Feb 21, 2014 at 10:28:49AM +0000, David Vrabel wrote:
> On 20/02/14 20:13, Greg Kroah-Hartman wrote:
> > On Thu, Feb 20, 2014 at 10:51:24AM +0000, David Vrabel wrote:
> >> These two changes fix important bugs with 32-bit Xen PV guests.
> >>
> >> 0160676bba69523e8b0ac83f306cce7d342ed7c8 (xen/p2m: check MFN is in range
> >> before using the m2p table)
> > 
> > Now applied.
> > 
> >> 7cde9b27e7b3a2e09d647bb4f6d94e842698d2d5 (xen: Fix possible user space
> >> selector corruption)
> > 
> > I had to edit this by-hand to get it to apply, can you verify I got it 
> > right?
> 
> I can't find where you put it.  But if it looks like this, it's ok.

You should have gotten an email about it.

> --- a/arch/x86/xen/smp.c
> +++ b/arch/x86/xen/smp.c
> @@ -245,6 +245,15 @@ static void __init xen_smp_prepare_boot_cpu(void)
>          old memory can be recycled */
>       make_lowmem_page_readwrite(xen_initial_gdt);
> 
> +#ifdef CONFIG_X86_32
> +     /*
> +      * Xen starts us with XEN_FLAT_RING1_DS, but linux code
> +      * expects __USER_DS
> +      */
> +     loadsegment(ds, __USER_DS);
> +     loadsegment(es, __USER_DS);
> +#endif
> +
>       xen_filter_cpu_maps();
>       xen_setup_vcpu_info_placement();
>  }

Yes, that was correct.

greg k-h

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