The ring PMD uses and undocumented devarg of "internal=" to create network
device from ring parameters. The problem is that it passes a pointer across
devargs which leads to ruin.  There is no way to validate that pointer really
points to valid data.

Example:
dpdk-testpmd --vdev=net_ring0,internal=0xdeadbeef -- -i
EAL: Detected CPU lcores: 20
EAL: Detected NUMA nodes: 1
EAL: Detected static linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'VA'
Segmentation fault

This is a design flaw.