[DPDK/ethdev Bug 1687] ring PMD uses unsafe internal devarg

[DPDK/ethdev Bug 1687] ring PMD uses unsafe internal devarg

[bugzilla]

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https://bugs.dpdk.org/show_bug.cgi?id=1687

            Bug ID: 1687
           Summary: ring PMD uses unsafe internal devarg
           Product: DPDK
           Version: 25.03
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: stephen@networkplumber.org
  Target Milestone: ---

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.

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