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SubjectRe: [PATCH 3/3] p9auth: add p9auth driver
> This is a change which must be discussed.  The use of this
> privilege can be completely prevented by having init remove
> CAP_GRANT_ID from its capability bounding set before forking any
> processes.

Which is a minor back compat issue - but you could start without it and
allow init to add it.

It seems a very complex interface to do a simple thing. A long time ago
there was discussion around extending the AF_UNIX fd passing to permit
'pass handle and auth' so you could send someone a handle with a "become
me" token attached.


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