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Date: Thu, 31 Dec 2015 19:18:31 -0600
From: "Serge E. Hallyn" <serge.hallyn@...ntu.com>
To: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc: "Serge E. Hallyn" <serge.hallyn@...ntu.com>,
Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
Oleg Nesterov <oleg@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Richard Guy Briggs <rgb@...hat.com>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
"Serge E. Hallyn" <serge@...lyn.com>, linux-kernel@...r.kernel.org
Subject: Re: [RFC] is_global_init() called on global init sub-thread
On Fri, Jan 01, 2016 at 10:10:35AM +0900, Sergey Senozhatsky wrote:
> On (12/31/15 19:08), Serge E. Hallyn wrote:
> > > re-upping https://www.redhat.com/archives/linux-audit/2013-December/msg00086.html
> > >
> > > Oleg Nesterov wrote:
> > >
> > > :Because is_global_init() is only true for the main thread of /sbin/init.
> > > :
> > > :Just look at oom_unkillable_task(). It tries to not kill init. But, say,
> > > :select_bad_process() can happily find a sub-thread of is_global_init()
> > > :and still kill it.
> > >
> > > this is still the case, isn't it? at least in some -stable kernels.
> > > is there (or was there) any reason this change has never been committed?
> > > (I'm particularly interested in is_global_init()).
> >
> > ... seems like it makes sense. Can you remind us which init you're having
> > to deal with?
> >
>
> systemd
>
> -ss
Well it makes sense to me. The question is whether we are protecting the
thing running as init, or the 'physical' thread with pid 1. I think it's
the former, so let's push on this. Please resend the patch with a proper
signed-off-by, and feel free to add
Acked-by: Serge Hallyn <serge.hallyn@...onical.com>
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