Hi Jan,
On 26/08/2021 11:13, Jan Beulich wrote:
> Like done in gnttab_setup_table(), check the handle once early in the
> function and use the lighter-weight (for PV) copying function in the
> loop.
>
> Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Julien Grall <jgrall@amazon.com>
Cheers,
>
> --- a/xen/common/grant_table.c
> +++ b/xen/common/grant_table.c
> @@ -3261,6 +3261,9 @@ gnttab_get_status_frames(XEN_GUEST_HANDL
> return -EFAULT;
> }
>
> + if ( !guest_handle_okay(op.frame_list, op.nr_frames) )
> + return -EFAULT;
> +
> d = rcu_lock_domain_by_any_id(op.dom);
> if ( d == NULL )
> {
> @@ -3301,7 +3304,7 @@ gnttab_get_status_frames(XEN_GUEST_HANDL
> for ( i = 0; i < op.nr_frames; i++ )
> {
> gmfn = gfn_x(gnttab_status_gfn(d, gt, i));
> - if ( copy_to_guest_offset(op.frame_list, i, &gmfn, 1) )
> + if ( __copy_to_guest_offset(op.frame_list, i, &gmfn, 1) )
> op.status = GNTST_bad_virt_addr;
> }
>
>
--
Julien Grall