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

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Message-ID: <3e8340490912072228m70368001v2487bd745ff208b3@mail.gmail.com>
Date:	Tue, 8 Dec 2009 01:28:45 -0500
From:	Bryan Donlan <bdonlan@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.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()

On Tue, Dec 8, 2009 at 12:38 AM, Ingo Molnar <mingo@...e.hu> wrote:
>
> * 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:

If another process is going to use ptrace to inject the cmdline string
into the victim's address space, it can also temporarily hijack a
thread to run prctl() on its behalf...
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