Virtio dmabuf improvements #256
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Shared objects lack spoofing protection. For VHOST_USER_BACKEND_SHARED_OBJECT_REMOVE messages received by the vhost-user interface, any backend was allowed to remove entries from the shared table just by knowing the UUID. Only the owner of the entry shall be allowed to removed their resources from the table. To fix that, add a check for all *SHARED_OBJECT_REMOVE messages received. A vhost device can only remove TYPE_VHOST_DEV entries that are owned by them, otherwise skip the removal, and inform the device that the entry has not been removed in the answer. Signed-off-by: Albert Esteve <aesteve@redhat.com>
Ensure that we cleanup all virtio shared resources when the vhost devices is cleaned up (after a hot unplug, or a crash). To track all owned uuids of a device, add a GSList to the vhost_dev struct. This way we can avoid traversing the full table for every cleanup, whether they actually own any shared resource or not. Signed-off-by: Albert Esteve <aesteve@redhat.com>
Functions in the virtio-dmabuf module start with 'virtio_*', which is too generic and may not correctly identify them as part of the virtio dmabuf API. Rename all functions to 'virtio_dmabuf_*' instead to avoid confusion. Signed-off-by: Albert Esteve <aesteve@redhat.com>
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Various improvements for the virtio-dmabuf module.
This patch includes:
virtio_dmabuf_*