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From: Christoph Lameter <cl@linux.com>
To: "Serge E. Hallyn" <serge@hallyn.com>
Cc: Serge Hallyn <serge.hallyn@canonical.com>,
	Andy Lutomirski <luto@amacapital.net>,
	Jonathan Corbet <corbet@lwn.net>,
	Aaron Jones <aaronmdjones@gmail.com>,
	linux-security-module@vger.kernel.org,
	linux-kernel@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-api@vger.kernel.org,
	Michael Kerrisk <mtk.manpages@gmail.com>
Subject: Re: [PATCH] capabilities: Ambient capability set V2
Date: Thu, 5 Mar 2015 12:41:36 -0600 (CST)	[thread overview]
Message-ID: <alpine.DEB.2.11.1503051235300.32373@gentwo.org> (raw)
In-Reply-To: <20150305171326.GA14998@mail.hallyn.com>

On Thu, 5 Mar 2015, Serge E. Hallyn wrote:

> > >
> > > So I'd say drop this change ^
> >
> > Then the ambient caps get ignored for a executables that have capabilities
> > seton the file?
>
> Yes.  Those are assumed to already know what they're doing.

Do they? What if there is a LD_PRELOAD library that redirects socket calls
and that needs raw device access (there are actually a number of software
packages like that to reduce the latency of network I/O. See for example
Solarflare's software products and the current rsocket libary in OFED.
There are cap issues if the rsocket library should be made useful for
Ethernet instead of infiniband).

> Why?  Do you foresee cases where a file that has fP set needs capabilities
> that aren't in its fP?

Yes due to the library issues.

> It seems more likely that they'll risk misbehaving due to an unexpected set
> of caps.

The userspace driver code in the library wont work since it does not have
the caps to access the raw device registers.

  reply	other threads:[~2015-03-05 18:41 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-26 22:14 Christoph Lameter
2015-03-01  4:44 ` Serge E. Hallyn
2015-03-02 15:43   ` Christoph Lameter
2015-03-01 23:33 ` Serge E. Hallyn
2015-03-05 15:26   ` Christoph Lameter
2015-03-05 17:13     ` Serge E. Hallyn
2015-03-05 18:41       ` Christoph Lameter [this message]
2015-03-05 23:07         ` Andy Lutomirski
2015-03-06 15:47           ` Christoph Lameter
2015-03-06 15:50       ` Christoph Lameter
2015-03-06 16:34         ` Serge E. Hallyn
2015-03-06 18:53           ` Christoph Lameter
2015-03-06 19:02             ` Andy Lutomirski
2015-03-06 20:08               ` Serge E. Hallyn
2015-03-07 15:09                 ` Christoph Lameter
2015-03-07 21:35                   ` Serge E. Hallyn
2015-03-09 12:05                     ` Christoph Lameter
2015-03-09 14:36                       ` Serge E. Hallyn
     [not found]                         ` <CALQRfL4uG2v7SJWZhN2o=ARnSNLR9JAX6MMsCCsGaAz6JcZTsA@mail.gmail.com>
2015-03-10 15:47                           ` Christoph Lameter
2015-03-07 15:06               ` Christoph Lameter
2015-03-07 21:35                 ` Serge E. Hallyn
2015-03-14 19:04 ` Pavel Machek

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