Date: Mon, 23 Feb 2015 10:50:39 -0600 (CST)
From: Christoph Lameter <cl@linux.com>
To: "Serge E. Hallyn" <serge@hallyn.com>
cc: Serge Hallyn <serge.hallyn@ubuntu.com>,
        Serge Hallyn <serge.hallyn@canonical.com>,
        Andy Lutomirski <luto@amacapital.net>,
        Aaron Jones <aaronmdjones@gmail.com>, "Ted Ts'o" <tytso@mit.edu>,
        linux-security-module@vger.kernel.org, akpm@linuxfoundation.org,
        "Andrew G. Morgan" <morgan@kernel.org>,
        Mimi Zohar <zohar@linux.vnet.ibm.com>,
        Austin S Hemmelgarn <ahferroin7@gmail.com>,
        Markku Savela <msa@moth.iki.fi>,
        Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
        linux-kernel@vger.kernel.org, linux-api@vger.kernel.org,
        Michael Kerrisk <mtk.manpages@gmail.com>,
        Jonathan Corbet <corbet@lwn.net>
Subject: Re: [PATCH] capabilities: Ambient capability set V1
In-Reply-To: <20150223164623.GB32181@mail.hallyn.com>
Message-ID: <alpine.DEB.2.11.1502231049110.21926@gentwo.org>
References: <alpine.DEB.2.11.1502051554500.4876@gentwo.org> <alpine.DEB.2.11.1502230856400.21238@gentwo.org> <20150223161625.GD25477@ubuntumail> <alpine.DEB.2.11.1502231041580.21784@gentwo.org> <20150223164623.GB32181@mail.hallyn.com>
Content-Type: TEXT/PLAIN; charset=US-ASCII
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 624
Lines: 15

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?
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/