linux-kernel - Re: [PATCH] ptrace: it is fun to strace /sbin/init

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Message-ID: <20080325145607.GQ2170@one.firstfloor.org>
Date:	Tue, 25 Mar 2008 15:56:07 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Pavel Machek <pavel@....cz>
Cc:	Andi Kleen <andi@...stfloor.org>, Krzysztof Halasa <khc@...waw.pl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...sign.ru>, ebiederm@...ssion.com,
	xemul@...nvz.org, sds@...ho.nsa.gov, roland@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ptrace: it is fun to strace /sbin/init

On Tue, Mar 25, 2008 at 03:47:54PM +0100, Pavel Machek wrote:
> Hi!
> 
> > > > I like the general idea -- i used to patch kernels to allow this too,
> > > > but it is dangerous.
> > > 
> > > Though root-only. Root doesn't want to be limited and knows better
> > > anyway. 
> > 
> > The problem is that you can deadlock if you are not very careful.
> 
> How is that different from ptracing any other process with _lot_ of
> children -- like X? You'll get same zombies in both cases, leading to
> same issues, no?

There is no unresolvable deadlock no.

-Andi
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