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

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Message-ID: <20080324230930.GE2426@elf.ucw.cz>
Date:	Tue, 25 Mar 2008 00:09:30 +0100
From:	Pavel Machek <pavel@....cz>
To:	Oleg Nesterov <oleg@...sign.ru>
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 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.

"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.

> Stephen, do you see any security problems if we make /sbin/init
> ptraceable by default?

								Pavel
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