netdev - Re: setrlimit(RLIMIT_NETWORK) vs. prctl(???)

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Date:	Wed, 16 Dec 2009 10:30:49 -0500
From:	Michael Stone <michael@...top.org>
To:	Ulrich Drepper <drepper@...il.com>
Cc:	Michael Stone <michael@...top.org>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, linux-security-module@...r.kernel.org,
	"Andi Kleen" <andi@...stfloor.org>, "David Lang" <david@...g.hm>,
	"Oliver Hartkopp" <socketcan@...tkopp.net>,
	"Alan Cox" <alan@...rguk.ukuu.org.uk>,
	"Herbert Xu" <herbert@...dor.apana.org.au>,
	"Valdis Kletnieks" <Valdis.Kletnieks@...edu>,
	"Bryan Donlan" <bdonlan@...il.com>,
	"Evgeniy Polyakov" <zbr@...emap.net>,
	"C. Scott Ananian" <cscott@...ott.net>,
	"James Morris" <jmorris@...ei.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Bernie Innocenti" <bernie@...ewiz.org>,
	"Mark Seaborn" <mrs@...hic-beasts.com>
Subject: Re: setrlimit(RLIMIT_NETWORK) vs. prctl(???)

Ulrich,

As promised, here's a draft based on prctl() for comparison with the
rlimit()-based approach presented in the first attempt.

It behaves as I expect in simple testing with busybox "nc" and I'll do a more
thorough test shortly. I'm sending it now because I think that it's good enough
to give a decent overview of what the end result of this implementation
strategy might look like.

Regards,

Michael

------

Michael Stone (3):
  Security: Add prctl(PR_{GET,SET}_NETWORK) interface.
  Security: Implement prctl(PR_SET_NETWORK, PR_NETWORK_OFF) semantics.
  Security: Document prctl(PR_{GET,SET}_NETWORK).

 Documentation/prctl_network.txt |   69 +++++++++++++++++++++++++++++++++++++++
 include/linux/prctl.h           |    7 ++++
 include/linux/prctl_network.h   |    7 ++++
 include/linux/sched.h           |    2 +
 kernel/Makefile                 |    2 +-
 kernel/fork.c                   |    2 +
 kernel/prctl_network.c          |   37 +++++++++++++++++++++
 kernel/ptrace.c                 |    2 +
 kernel/sys.c                    |    7 ++++
 net/socket.c                    |   51 +++++++++++++++++++++-------
 net/unix/af_unix.c              |   19 +++++++++++
 11 files changed, 191 insertions(+), 14 deletions(-)
 create mode 100644 Documentation/prctl_network.txt
 create mode 100644 include/linux/prctl_network.h
 create mode 100644 kernel/prctl_network.c

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