linux-kernel - Re: [PATCH 04/10] ptrace: implement PTRACE

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20110519162129.GC17265@redhat.com>
Date:	Thu, 19 May 2011 18:21:29 +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 04/10] ptrace: implement PTRACE_INTERRUPT

On 05/19, Tejun Heo wrote:
>
> Hello,
>
> On Wed, May 18, 2011 at 08:38:15PM +0200, Oleg Nesterov wrote:
> > On 05/16, Tejun Heo wrote:
> > >
> > > +	case PTRACE_INTERRUPT:
> > > +		/*
> > > +		 * Stop tracee without any side-effect on signal or job
> > > +		 * control.  At least one trap is guaranteed to happen
> > > +		 * after this request.  If @child is already trapped, the
> > > +		 * current trap is not disturbed and another trap will
> > > +		 * happen after the current trap is ended with PTRACE_CONT.
> > > +		 *
> > > +		 * The actual trap might not be PTRACE_EVENT_STOP trap but
> > > +		 * the pending condition is cleared regardless.
> > > +		 */
> > > +		if (likely(child->ptrace & PT_SEIZED) &&
> > > +		    lock_task_sighand(child, &flags)) {
> > > +			child->jobctl |= JOBCTL_TRAP_STOP;
> >
> > The same race with do_signal_stop() afaics.
>
> I didn't understand that one,

Yeah, I was wrong, see the previous email.

Oleg.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/