linux-kernel - Re: [PATCH 0/2] exit/pid

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Message-ID: <20141124213817.GA25020@redhat.com>
Date:	Mon, 24 Nov 2014 22:38:17 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Aaron Tomlin <atomlin@...hat.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	Sterling Alexander <stalexan@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] exit/pid_ns: comments + simple fix

On 11/24, Eric W. Biederman wrote:
>
> Oleg Nesterov <oleg@...hat.com> writes:
>
> > Eric, Pavel, could you review 1/2 ? (documentation only). It is based on the
> > code inspection, I didn't bother to verify that my understanding matches the
> > reality ;)
>
> Oleg you are being subtle, introducing some gratuitous changes and
> slightly off base which makes this all very hard to review.

Eric, this doesn't depend on other changes I sent ;)

> Eric
> 
> 
> > On 11/20, Oleg Nesterov wrote:
> >>
> >>
> >> Probably this is not the last series... in particular it seems that we
> >> have some problems with sys_setns() in this area, but I need to recheck.
> >
> > So far only the documentation fix. I'll write another email (hopefully with the
> > patch), afaics at least setns() doesn't play well with PR_SET_CHILD_SUBREAPER.
> >
> > Contrary to what I thought zap_pid_ns_processes() looks fine, but it seems only
> > by accident. Unless I am totally confused, wait for "nr_hashed == init_pids"
> > could be removed after 0a01f2cc390e10633a "pidns: Make the pidns proc mount/
> > umount logic obvious". However, now that setns() + fork() can inject a task
> > into a child namespace, we need this code again for another reason.
> >
> > I _think_ we can actually remove it and simplify free_pid() as well, but lets
> > discuss this later and fix the wrong/confusing documentation first.
> >
> > 2/2 looks "obviously correct", but I'll appreciate your review anyway.
> >
> > Oleg.
> >
> >  kernel/pid.c           |    7 +++----
> >  kernel/pid_namespace.c |   23 +++++++++++++++++++----
> >  2 files changed, 22 insertions(+), 8 deletions(-)

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