linux-kernel - Re: [RFC/PATCH] RLIMIT_ARG

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Message-ID: <65dd6fd50802291101j3786ee60iec0f3a24f5df9945@mail.gmail.com>
Date:	Fri, 29 Feb 2008 11:01:38 -0800
From:	"Ollie Wild" <aaw@...gle.com>
To:	"Linus Torvalds" <torvalds@...ux-foundation.org>
Cc:	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	"Michael Kerrisk" <michael.kerrisk@...glemail.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	michael.kerrisk@...il.com, carlos@...esourcery.com,
	"Alan Cox" <alan@...rguk.ukuu.org.uk>,
	linux-kernel <linux-kernel@...r.kernel.org>, drepper@...hat.com,
	mtk.manpages@...il.com
Subject: Re: [RFC/PATCH] RLIMIT_ARG_MAX

On Fri, Feb 29, 2008 at 10:12 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> So it's not *going* to be exact even with RLIMIT_ARG_MAX, because it's
> going to have all those other issues to contend with - on a 64-bit
> architecture, the argument _pointers_ are often within an order of
> magnitude of the argument strings themselves, and I don't think your patch
> counted them as part of the argument/environemnt size (I was too lazy to
> check the sources, but I'm pretty sure argv/env_start/end is just the
> string space, not the pointers).

This is precisely why I picked 25% as the maximum argument size ratio.
 In practice, that 25% can easily mean 50% or more.  If people want to
increase this, it can probably be tweaked somewhat, but switching it
to, say, 50% probably isn't a good idea.

Ollie
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