linux-kernel - Re: setrlimit(RLIMIT_NETWORK) vs. prctl(???)

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Message-ID: <a36005b50912122120n4656b97bx6a6d862a57671e6d@mail.gmail.com>
Date:	Sat, 12 Dec 2009 21:20:13 -0800
From:	Ulrich Drepper <drepper@...il.com>
To:	Michael Stone <michael@...top.org>
Cc:	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>,
	Rémi Denis-Courmont <rdenis@...phalempin.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(???)

On Sat, Dec 12, 2009 at 21:09, Michael Stone <michael@...top.org> wrote:
>> That being said, I'm not wedded to the decision. Could you give me some
>> more
>> specific examples of the kinds of changes in low-level userspace code that
>> you're worried about?

It was an accident that I sent the email privately.

As summarized in the paraphrased comment, it's a pain to deal with
rlimit extensions.  It's easy enough to do all this using prctl() with
the same semantics and without forcing any other code to be modified.
I let others more competent to judge the usefulness.  But using rlimit
as the interface is just plain wrong.
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