linux-kernel - Re: oom && coredump

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Message-ID: <20141202085949.GA27014@dhcp22.suse.cz>
Date:	Tue, 2 Dec 2014 09:59:49 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Cong Wang <xiyou.wangcong@...il.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>, Tejun Heo <tj@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: oom && coredump

On Thu 27-11-14 18:47:47, Oleg Nesterov wrote:
> On 11/27, Michal Hocko wrote:
[...]
> > Why is the ptrace check wrong?
> 
> It was added in reply to exploit I sent. But:
> 
> - It doesn't (and can't) really work, it can only detect this particular
>   case and the same exploit still blocks oom-killer with the minimal
>   modifications.
> 
> - Once again, this has nothing to do with ptrace. That exploit used
>   ptrace only to control (freeze) the coredumping process, the coredumping
>   can "hang" because of other reasons.
> 
> - It is no longer needed after this patch, the coredumping process will
>   be killed.

OK, I guess I am seeing it now. Thanks for the clarification!

[...]
-- 
Michal Hocko
SUSE Labs
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