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

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Message-ID: <20080324225611.GA157@tv-sign.ru>
Date:	Tue, 25 Mar 2008 01:56:11 +0300
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	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 03/24, Andrew Morton wrote:
>
> On Sun, 23 Mar 2008 16:51:10 +0300
> Oleg Nesterov <oleg@...sign.ru> wrote:
> 
> > Ptracing of /sbin/init is not allowed. Of course, this is dangerous, but may
> > be useful. Introduce the kernel boot parameter to allow this, so that we can't
> > surprise some special/secured systems.
> 
> I dunno, is this really needed?

Well, this is the question. I think it would be very nice to have the ability
to debug/strace init. Especially if you try to make your own distribution /
your own init.

Sometimes I see init at the top of the top's output, with this patch I have a
chance to see what's going on on my system.

> If root wants to screw up his kernel then
> he is free to do so.

I think you and Pavel are very wrong here.

First, this has nothing to do with kernel, imho. Afaics, now there are no kernel
problems with ptracing init.

And. When I was admin in my previous life, I certainly was not able to patch
the kernel and then strace/debug init.

> And if we *really* want an extra foot-protector for this, it could be a
> runtime /proc/sys/kernel/root-can-shoot-inits-foot rather than a boot-time
> option?

Even better! I agree, will re-send. I choose the boot-time paramater because
it looks like the "most safe" option.

Oleg.

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