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

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Message-ID: <20080324231859.GA193@tv-sign.ru>
Date:	Tue, 25 Mar 2008 02:18:59 +0300
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Pavel Machek <pavel@....cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	Roland McGrath <roland@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ptrace: it is fun to strace /sbin/init

On 03/25, Pavel Machek wrote:
>
> On Tue 2008-03-25 02:04:58, Oleg Nesterov wrote:
> > On 03/24, Pavel Machek wrote:
> > >
> > > > /sbin/init is important, but there are other important (and sometimes
> > > > much more important) services. Why it is so special so that we can't
> > > > debug/strace it?
> > > 
> > > Maybe. Let's kill /sbin/init protection in 2.6.26. But making it
> > > optional is wrong.
> > 
> > You are right, the boot parameter is silly. How about sysctl?
> 
> I'd prefer it to be hardcoded, really.

Yes! me too.

> "You can kill /sbin/init" sounds right.
> 
> "You can kill /sbin/init on 2.6.26+" sounds... still quite ok.
> 
> "You can kill /sbin/init on 2.6.26+ if you have /proc/sys/foo/bar ==
> 1" sounds... quite wrong.

Please look at another discussion, http://marc.info/?t=120568298600007

When I did this simple patch, I was very sure it is "obviously good".
But as Stephen pointed out, we have the systems that relies on the
current behaviour, even if this behaviour is not "optimal".

Oleg.

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