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Date: Mon, 9 Mar 2015 09:36:53 -0500
From: "Serge E. Hallyn" <serge@hallyn.com>
To: Christoph Lameter <cl@linux.com>
Cc: "Serge E. Hallyn" <serge@hallyn.com>,
        Andy Lutomirski <luto@amacapital.net>,
        Serge Hallyn <serge.hallyn@canonical.com>,
        Jonathan Corbet <corbet@lwn.net>, Aaron Jones <aaronmdjones@gmail.com>,
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        Austin S Hemmelgarn <ahferroin7@gmail.com>,
        Markku Savela <msa@moth.iki.fi>,
        Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
        Linux API <linux-api@vger.kernel.org>,
        Michael Kerrisk <mtk.manpages@gmail.com>
Subject: Re: [PATCH] capabilities: Ambient capability set V2
Message-ID: <20150309143653.GA29594@mail.hallyn.com>
References: <alpine.DEB.2.11.1503050917380.31001@gentwo.org>
 <20150305171326.GA14998@mail.hallyn.com>
 <alpine.DEB.2.11.1503060948460.8207@gentwo.org>
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 <CALCETrVQF22rkZFD8VAW_xrVQOjwpej6W4TJS9gbN9B431TEKg@mail.gmail.com>
 <20150306200838.GA29198@mail.hallyn.com>
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On Mon, Mar 09, 2015 at 07:05:24AM -0500, Christoph Lameter wrote:
> On Sat, 7 Mar 2015, Serge E. Hallyn wrote:
> 
> > > The ancestor here is ambient_test and when it is run pI will not be set
> > > despite the cap setting.
> >
> > ambient_test is supposed to set it.
> 
> I thought the setcap +i would do it.
> 
> So the setcap and setting of the file inheritance bits has no effect on
> pI? When the process starts pI is off despite fI being set?

Correct, pI must be set through capset().  Again, x in fI is saying
that the certain trusted users may have x in pP when they run the
binary;  x in pi means that the users may have x in pP when they run
certain files.  Other users running the file won't have x in pP, and
the special user running other files won't have x in pP.