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

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Message-ID: <20080325143544.GP2170@one.firstfloor.org>
Date:	Tue, 25 Mar 2008 15:35:44 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Krzysztof Halasa <khc@...waw.pl>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...sign.ru>, ebiederm@...ssion.com,
	xemul@...nvz.org, pavel@....cz, 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 03:30:29PM +0100, Krzysztof Halasa wrote:
> Andi Kleen <andi@...stfloor.org> writes:
> 
> > The problem is that you can deadlock if you are not very careful.
> 
> I can damage the system in trillion ways, one more is not a problem
> :-)

We don't actually have that many ways for hard deadlocks even
as root (short of doing really nasty things on /dev/kmem) 

> Hopefully someone will write the details down to enable root to be
> very careful.

Sure, but if the deadlocks can be avoided on the kernel level (just
making sure the children are already reaped) then it would be even
better.

-Andi
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