linux-kernel - Re: [PATCH] capabilities: Ambient capability set V1

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Message-ID: <20150226211324.GB19273@mail.hallyn.com>
Date:	Thu, 26 Feb 2015 15:13:24 -0600
From:	"Serge E. Hallyn" <serge@...lyn.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	"Serge E. Hallyn" <serge@...lyn.com>,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Andy Lutomirski <luto@...capital.net>,
	Aaron Jones <aaronmdjones@...il.com>, Ted Ts'o <tytso@....edu>,
	linux-security-module@...r.kernel.org, akpm@...uxfoundation.org,
	"Andrew G. Morgan" <morgan@...nel.org>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Austin S Hemmelgarn <ahferroin7@...il.com>,
	Markku Savela <msa@...h.iki.fi>,
	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH] capabilities: Ambient capability set V1

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.
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