Si-Wei Liu 30c22f3816 vdpa/mlx5: should verify CTRL_VQ feature exists for MQ ... Per VIRTIO v1.1 specification, section 5.1.3.1 Feature bit requirements: "VIRTIO_NET_F_MQ Requires VIRTIO_NET_F_CTRL_VQ". There's assumption in the mlx5_vdpa multiqueue code that MQ must come together with CTRL_VQ. However, there's nowhere in the upper layer to guarantee this assumption would hold. Were there an untrusted driver sending down MQ without CTRL_VQ, it would compromise various spots for e.g. is_index_valid() and is_ctrl_vq_idx(). Although this doesn't end up with immediate panic or security loophole as of today's code, the chance for this to be taken advantage of due to future code change is not zero. Harden the crispy assumption by failing the set_driver_features() call when seeing (MQ && !CTRL_VQ). For that end, verify_min_features() is renamed to verify_driver_features() to reflect the fact that it now does more than just validate the minimum features. verify_driver_features() is now used to accommodate various checks against the driver features for set_driver_features(). Signed-off-by: Si-Wei Liu <si-wei.liu@oracle.com> Link: https://lore.kernel.org/r/1642206481-30721-3-git-send-email-si-wei.liu@oracle.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Eli Cohen <elic@nvidia.com> Acked-by: Jason Wang <jasowang@redhat.com>		2022-03-04 11:56:33 -05:00
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core	vhost,virtio,vhost: fixes,features	2021-11-03 15:00:39 -07:00
net	vdpa/mlx5: should verify CTRL_VQ feature exists for MQ	2022-03-04 11:56:33 -05:00
Makefile	vdpa/mlx5: Connect mlx5_vdpa to auxiliary bus	2020-12-06 07:32:05 +02:00