From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Serge E. Hallyn" <serge-A9i7LUbDfNHQT0dZR+AlfA@public.gmane.org>
Subject: Re: [PATCH] capabilities: Ambient capability set V1
Date: Thu, 26 Feb 2015 15:13:24 -0600
Message-ID: <20150226211324.GB19273@mail.hallyn.com>
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To: Christoph Lameter <cl-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>
Cc: "Serge E. Hallyn" <serge-A9i7LUbDfNHQT0dZR+AlfA@public.gmane.org>, Serge Hallyn <serge.hallyn-GeWIH/nMZzLQT0dZR+AlfA@public.gmane.org>, Serge Hallyn <serge.hallyn-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org>, Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>, Aaron Jones <aaronmdjones-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Ted Ts'o <tytso-3s7WtUTddSA@public.gmane.org>, linux-security-module-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, akpm-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org, "Andrew G. Morgan" <morgan-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, Mimi Zohar <zohar-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>, Austin S Hemmelgarn <ahferroin7-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Markku Savela <msa-kXoF896ld44xHbG02/KK1g@public.gmane.org>, Jarkko Sakkinen <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Jonathan Corbet <corbet-T1hC0tSOHrs@public.gmane.org>
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On Thu, Feb 26, 2015 at 03:09:48PM -0600, Christoph Lameter wrote:
> On Thu, 26 Feb 2015, Serge E. Hallyn wrote:
> 
> > > Same problem as before. The ambient bits will not be set in pE'.
> >
> > And what if I weren't scatterbrained and we did
> >
> >  	if (pA)
> >  		pE' = pP'
> >  	else
> >  		pE' = pP' & fE
> >
> > All pP' bits would be set in pE'.
> 
> Ok and the non ambient case would break because fE is not available?
> Doesnt this reduce to
> 
> pE' = pP'
> 
> in either case?

No.  fE is not "not available".  If you set it with setcap, you *should*
(if i'm tinking right) find fE full when calculating the new capability
sets, because of magic_etc.