linux-kernel - Re: [PATCH v6] Added PR_SET_PROCTITLE

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Message-ID: <20091208053851.GA12383@elte.hu>
Date:	Tue, 8 Dec 2009 06:38:51 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Bryan Donlan <bdonlan@...il.com>,
	Ulrich Drepper <drepper@...hat.com>,
	Timo Sirainen <tss@....fi>,
	WANG Cong <xiyou.wangcong@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v6] Added PR_SET_PROCTITLE_AREA option for prctl()


* KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:

> > The feature looks useful, but the choice of a prctl as an API is strange 
> > - it limits us to the current task only - while the ability to set 
> > arguments for another task looks a more generic (and potentially more 
> > useful) solution.
> 
> No. It's impossible.
> /proc/{pid}/cmdline read user process's memory. iow, this prctl() don't
> receive string, it receive virtual address itself. [...]

it's not 'impossible' at all, you yourself mention ptrace:

> [...] I don't want any task allow to change another task's memory 
> except ptrace.

And i did not mean to allow 'any' task to be allowed to do this - 
security checks apply, obviously.

	Ingo
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