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Re: [Libguestfs] [PATCH nbdkit 0/4] Reflection plugin, peer name.

On 9/15/19 9:55 AM, Richard W.M. Jones wrote:

The fun plugin is a reflection plugin which "reflects" client
information back to the client.  We have a few fun plugins like this
(hello there, nbdkit-full-plugin) and normally I would push these
without review, but in this particular case there's a specific danger
that sending back data under control of the client might lead to a
security problem.  I _believe_ I have avoided that pitfall, but my
belief isn't as good as having experts review it :-)

A thought for another potentially fun mode: what if the reflection plugin reports back connection uptime? The disk would be a fixed-width size (maybe 8 bytes: uint32_t for seconds, uint32_t for nanoseconds), where the contents are always changing to record the delta in time between any given request and when the connection was first created (in this mode, multi-conn and caching contents is actually quite wrong). Back-to-back commands can in turn be used to measure connection latencies.

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org

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