From: Pavel Emelyanov <xemul@openvz.org>
To: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Andi Kleen <andi@firstfloor.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Herbert Poetzl <herbert@13thfloor.at>,
Krzysztof Halasa <khc@pm.waw.pl>, Pavel Machek <pavel@ucw.cz>,
"Serge E. Hallyn" <serue@us.ibm.com>,
Stephen Smalley <sds@tycho.nsa.gov>,
Roland McGrath <roland@redhat.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] ptrace: allow to ptrace /sbin/init
Date: Thu, 27 Mar 2008 10:20:20 +0300 [thread overview]
Message-ID: <47EB4AB4.7070704@openvz.org> (raw)
In-Reply-To: <20080326201623.GA131@tv-sign.ru>
Oleg Nesterov wrote:
> Afaics, currently there are no kernel problems with ptracing init, it can't
> lose SIGNAL_UNKILLABLE flag and be killed/stopped by accident.
>
> The ability to strace/debug init can be very useful if you try to figure
> out why it does not work as expected.
>
> However, admin should know what he does, "gdb /sbin/init 1" stops init, it
> can't reap orphaned zombies or take care of /etc/inittab until continued.
> It is even possible to crash init (and thus the whole system) if you wish,
> ptracer has full control.
>
> See also the long discussion: http://marc.info/?t=120628018600001
>
> Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Pavel Emelyanov <xemul@openvz.org>
prev parent reply other threads:[~2008-03-27 7:24 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-26 20:16 [PATCH] ptrace: allow to ptrace /sbin/init Oleg Nesterov
2008-03-26 20:40 ` Roland McGrath
2008-03-27 7:20 ` Pavel Emelyanov [this message]
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