Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933416AbYB2SxR (ORCPT ); Fri, 29 Feb 2008 13:53:17 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1760813AbYB2Sw6 (ORCPT ); Fri, 29 Feb 2008 13:52:58 -0500 Received: from outpipe-village-512-1.bc.nu ([81.2.110.250]:35542 "EHLO lxorguk.ukuu.org.uk" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1758118AbYB2Sw5 (ORCPT ); Fri, 29 Feb 2008 13:52:57 -0500 Date: Fri, 29 Feb 2008 18:40:44 +0000 From: Alan Cox To: Peter Zijlstra Cc: Linus Torvalds , Michael Kerrisk , aaw , Andrew Morton , michael.kerrisk@gmail.com, carlos@codesourcery.com, linux-kernel , drepper@redhat.com, mtk.manpages@gmail.com Subject: Re: [RFC/PATCH] RLIMIT_ARG_MAX Message-ID: <20080229184044.6b5347eb@core> In-Reply-To: <1204307756.6243.121.camel@lappy> References: <1204119455.6242.403.camel@lappy> <1204305244.6243.111.camel@lappy> <1204307756.6243.121.camel@lappy> X-Mailer: Claws Mail 3.2.0 (GTK+ 2.12.5; x86_64-redhat-linux-gnu) Organization: Red Hat UK Cyf., Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, Y Deyrnas Gyfunol. Cofrestrwyd yng Nghymru a Lloegr o'r rhif cofrestru 3798903 Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1307 Lines: 31 On Fri, 29 Feb 2008 18:55:56 +0100 Peter Zijlstra wrote: > > On Fri, 2008-02-29 at 09:35 -0800, Linus Torvalds wrote: > > > > On Fri, 29 Feb 2008, Peter Zijlstra wrote: > > > > > > You fail to mention that <23 will still fault the first time it tries to > > > grow the stack when you set rlimit_stack to 128k and actually supply > > > 128k of env+arg. > > > > So? That's what rlimit_stack has always meant (and not just on Linux > > either, afaik). That's not a bug, it's a feature. If the system has a > > limited stack, it has a limited stack. That's what RLIMIT_STACK means. > > Well, I agree with that point. It just that apparently POSIX does not. > According to Michael POSIX does not consider the arg+env array part of > the stack proper. As far as I can see POSIX and SuS do not care. In all the ABIs some of your stack is already used by stuff. Posix doesn't seem to consider it either way. By some undefined magic main() gets argc, argv, envp. Quite frankly it could read them from a pipe before main is called. Alan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/