linux-kernel - Re: ptrace fixes for 3.2

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Message-ID: <20120104155927.GB27484@redhat.com>
Date:	Wed, 4 Jan 2012 16:59:27 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Denys Vlasenko <vda.linux@...glemail.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	linux-kernel@...r.kernel.org,
	Łukasz Michalik <lmi@....uni.wroc.pl>,
	"Dmitry V. Levin" <ldv@...linux.org>
Subject: Re: ptrace fixes for 3.2

Hello,

On 01/04, Tejun Heo wrote:
>
> On Wed, Jan 04, 2012 at 12:35:34PM +0100, Oleg Nesterov wrote:
> > Can't understand how did we miss this, but WARN_ON_ONCE(!ptrace)
> > in do_signal_stop() is not right. Debugger can resume the stopped
> > task, and it can clone the _untraced_ thread running in the stopped
> > group.
>
> Right, we should be setting JOBCTL_STOP_PENDING for newly cloned tasks
> if sigstop is in effect.

Yes, probably this is the natural choice.

> Looks good to me, provided proper fix is coming soon. :p

Good.

Yes, this is the temporary fix for 3.2.

Thanks!

Oleg.

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