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

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Message-ID: <20150223181553.GE25477@ubuntumail>
Date:	Mon, 23 Feb 2015 18:15:53 +0000
From:	Serge Hallyn <serge.hallyn@...ntu.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	"Serge E. Hallyn" <serge@...lyn.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

Quoting Christoph Lameter (cl@...ux.com):
> On Mon, 23 Feb 2015, Serge E. Hallyn wrote:
> 
> > > I do not see a problem with dropping privilege since the ambient set
> > > is supposed to be preserved across a drop of priviledge.
> >
> > Because you're tricking the program into thinking it has dropped
> > the privilege, when in fact it has not.
> 
> So the cap was dropped from the cap perm set but it is still active
> in the ambient set?

Right, and the legacy program doesn't know to check the new set.
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