From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Lameter <cl@linux.com>
Subject: Re: [PATCH] capabilities: Ambient capability set V1
Date: Mon, 23 Feb 2015 10:41:51 -0600 (CST)
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To: Andy Lutomirski <luto@amacapital.net>
Cc: Serge Hallyn <serge.hallyn@canonical.com>, Aaron Jones <aaronmdjones@gmail.com>, Ted Ts'o <tytso@mit.edu>, LSM List <linux-security-module@vger.kernel.org>, Andrew Morton <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-kernel@vger.kernel.org>, Linux API <linux-api@vger.kernel.org>, Michael Kerrisk <mtk.manpages@gmail.com>, Jonathan Corbet <corbet@lwn.net>
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On Mon, 23 Feb 2015, Andy Lutomirski wrote:

> If you set ambient caps and then run a setuid program (without
> no_new_privs), then the ambient set *must* be cleared by the kernel
> because that's what the setuid program expects.  Yes, the whole

Why would a setuid program expect that? I'd say we expect the ambient set
to remain in effect. What would break if the ambient set would stay
active?