Re: [capabilities] Allow normal inheritance for a configurable set of capabilities

[Christoph Lameter]

On Wed, 4 Feb 2015, Serge E. Hallyn wrote:

> Ok this is all sounding too magic for my tastes.  My original suggestion
> was for an actual new capability set, pA, empty by default.  You can
> add bits to it using prctl if ns_capable(CAP_SETPCAP) and all the new bits are
> in your pE.  Once set, they stay until they are removed using prctl.  At
> exec, pA' = pA, and fI |= pA (after reading fI from disk but before
> calculating pI').

Sounds good. I think we cannot avoid the additional capability set in the
cred structure since otherwise the regular ("crippled") inheritance bits
may be modified and then not passed on correctly.

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