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[Frama-c-discuss] Jessie - sufficiency of proofs


thanks a lot for your clarification,
it was eye-opening for me.


> This is an interesting question, and I am not surprised
> that you found different answers for it. I will provide one
> point of view.

> > I wonder about a general question. When is a proof considered to be
> > sufficient and exhaustive?

> It all depends on the objectives you have. It is not
> our (us tool providers) place to define them.

> To use an example, avionics software is usually written
> according to the guidelines defined in the DO-178B. The
> DO-178B is a rather general document, and the way it
> is actually implemented (by the aircraft manufacturer)
> is checked by the appropriate authority (the FAA, the EASA).
> In the DO-178B, tools that are used in the process have
> to be qualified (by the manufacturer): as development tools
> for things such as compilers, and as verification tools
> for tools used in verification. The qualification of a tool
> as development tool is an extremely heavy process.
> In comparison, the qualification as a verification tool is
> lighter, but still a significant piece of work.

> The aircraft manufacturer, not the tool provider, defines
> the usage that is made of the tool during the verification
> process, and shows the steps that were taken in order to
> check that the tool could be used reliably for this purpose.
> According to ,
> *comprehensive* (emphasis mine) black-box testing is
> currently judged sufficient for qualifying a tool as a
> verification tool.

> In short, if you need to trust any part of the Frama-C platform,
> you should first define your needs and make sure yourself that
> it suits them.

> Best regards,

> Pascal

> PS: I will be immodest enough to point to
> and I also recommend the last section of
> for an overview of how software verification works
> (although the Shuttle's software was verified using
> testing techniques only, to the best of my knowledge)
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