linux-kernel - Re: [PATCH] move RLIMIT_NPROC check from set_user() to do_execve

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Message-ID: <20110715053505.GA24870@1wt.eu>
Date:	Fri, 15 Jul 2011 07:35:05 +0200
From:	Willy Tarreau <w@....eu>
To:	NeilBrown <neilb@...e.de>
Cc:	Solar Designer <solar@...nwall.com>,
	James Morris <jmorris@...ei.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Vasiliy Kulikov <segoon@...nwall.com>,
	linux-kernel@...r.kernel.org, Greg Kroah-Hartman <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"David S. Miller" <davem@...emloft.net>,
	kernel-hardening@...ts.openwall.com, Jiri Slaby <jslaby@...e.cz>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Eric Paris <eparis@...hat.com>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	Sebastian Krahmer <krahmer@...e.de>
Subject: Re: [PATCH] move RLIMIT_NPROC check from set_user() to do_execve_common()

Hi Neil,

On Fri, Jul 15, 2011 at 01:30:13PM +1000, NeilBrown wrote:
(...)
> But what do you think of this.  It sure that only the process which ignored
> the return value from setuid is inconvenienced.
(...)

I think this is a smart idea. But will the flag be inherited by children
over a fork() ? If not, we might as well block fork(), because we can
expect a lot of fork+exec situations which are as dangerous as the simple
execve().

Regards,
Willy

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