Re: [Xen-devel] [PATCH v2] x86/xen: allow userspace access during hypercalls

[Juergen Groß <jgross@xxxxxxxx>]

On 06/26/2017 02:49 PM, Marek Marczykowski-Górecki wrote:
> Userspace application can do a hypercall through /dev/xen/privcmd, and
> some for some hypercalls argument is a pointers to user-provided
> structure. When SMAP is supported and enabled, hypervisor can't access.
> So, lets allow it.
>
> The same applies to HYPERVISOR_dm_op, where additionally privcmd driver
> carefully verify buffer addresses.
>
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>


Thanks,

Juergen

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