linux-kernel - Re: [PATCH 0/8] make vfork killable/restartable/traceable

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: <20110811162245.GL23842@htj.dyndns.org>
Date:	Thu, 11 Aug 2011 18:22:45 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Pavel Machek <pavel@....cz>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Roland McGrath <roland@...k.frob.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Matt Fleming <matt.fleming@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/8] make vfork killable/restartable/traceable

Hello,

On Thu, Aug 11, 2011 at 06:09:14PM +0200, Oleg Nesterov wrote:
> On 08/10, Pavel Machek wrote:
> >
> > > CLONE_VFORK sleeps in TASK_INTERRUPTIBLE until the child exits/execs.
> > > This is obviously not good, it is sooo simple to create the task which
> > > doesn't react to SIGKILL/SIGSTOP.
> > >
> > > Questions:
> > >
> > > 	- do we really need this?
> > >
> > I believe we should fix it. I was always claiming "if it does not
> > react to SIGKILL, it is a kernel bug" and well, this just proved me
> > wrong...
> 
> Agreed.
> 
> Just in case... sorry to all for delay, I am busy. I'll try to resend
> the simplified version "soon", at least the "unkillable" part. And
> we also have the pending oom issues...

I'm currently trying to handle both vfork and cgroup freezes as jobctl
stop so that all three different stop modes - group stop, vfork wait
and cgroup freeze - share the same characteristics.  I'm currently
somewhat stuck with some freezer and kthread issues I discovered in
the process and it seems like it would take some time.

Thanks.

-- 
tejun
--
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/