linux-kernel - Re: [PATCH v2 1/2] capabilities: Ambient capabilities

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Message-ID: <alpine.DEB.2.11.1505261122030.12282@gentwo.org>
Date:	Tue, 26 May 2015 11:23:10 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Serge Hallyn <serge@...lyn.com>
cc:	Andy Lutomirski <luto@...nel.org>,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	Andrew Morton <akpm@...uxfoundation.org>,
	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
	Ted Ts'o <tytso@....edu>,
	"Andrew G. Morgan" <morgan@...nel.org>,
	Linux API <linux-api@...r.kernel.org>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Austin S Hemmelgarn <ahferroin7@...il.com>,
	linux-security-module <linux-security-module@...r.kernel.org>,
	Aaron Jones <aaronmdjones@...il.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Markku Savela <msa@...h.iki.fi>,
	Kees Cook <keescook@...omium.org>,
	Jonathan Corbet <corbet@....net>,
	Andy Lutomirski <luto@...capital.net>
Subject: Re: [PATCH v2 1/2] capabilities: Ambient capabilities

On Sat, 23 May 2015, Serge Hallyn wrote:

> > You cannot use pA to try to subvert a setuid, setgid, or file-capped
> > program: if you execute any such program, pA gets cleared and the
> > resulting evolution rules are unchanged by this patch.
>
> Christoph, just to be sure, is this ^ going to suffice for you?
>
> Seems like it should since any program which is setuid-root, i.e.
> passwd, isn't likely to be designed to exec other programs.

Yes that should work.

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