linux-kernel - Re: [PATCH 09/10] ptrace: add JOBCTL_BLOCK

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Message-ID: <20110519164833.GA19053@redhat.com>
Date:	Thu, 19 May 2011 18:48:33 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	jan.kratochvil@...hat.com, vda.linux@...glemail.com,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, indan@....nu, bdonlan@...il.com
Subject: Re: [PATCH 09/10] ptrace: add JOBCTL_BLOCK_NOTIFY

On 05/19, Tejun Heo wrote:
>
> Hello,
>
> On Thu, May 19, 2011 at 06:32:33PM +0200, Oleg Nesterov wrote:
> > > +	/*
> > > +	 * Make sure @chlid is still ptraced by us and clear BLOCK_NOTIFY.
> > > +	 */
> > > +	if (likely((child->ptrace & PT_PTRACED) && child->parent == current))
> >
> > This looks a bit confusing... It is either traced or not. If it is traced,
> > nobody else can trace it. In fact even PT_PTRACED is not strictly needed
> > but I agree this check makes the code cleaner.
>
> Hmmm... I suppose we can make the error paths finer grained so that
> attach failure

Ah, you are right again, I forgot about PTRACE_ATTACH path.

Thanks,

Oleg.

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