linux-kernel - Re: [PATCH]: exec: avoid propagating PF_NO

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Message-ID: <20131128181304.GA19628@redhat.com>
Date:	Thu, 28 Nov 2013 19:13:04 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Tejun Heo <htejun@...il.com>, zhang.yi20@....com.cn,
	lkml <linux-kernel@...r.kernel.org>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH]: exec: avoid propagating PF_NO_SETAFFINITY into
	userspace child

On 11/28, Peter Zijlstra wrote:
>
> So in specific, you say that piping a core file into a usermode helper
> is currently busted in pid-namespaces and that fixing that would indeed
> introduce such pid-namespace awareness to the usermode-helper stuff?

Perhaps yes. People want to run the core handler in the namespace of
the crashed task. And (perhaps) even dumping to the file should use
per-namespace ->root/etc.

(and of course core_pattern[] should not be global, but this is
 another story).

And there are other potential users. Say, nfsd user-mode helpers wants
to have the "right" mnt (at least) namespace.

But again, this all needs a lot of discussions. Even the API is not
actually clear. As for implementation, we could probably even force
->child_reaper (the subnamespace's init) to fork/exec the usermode
helper in this case. Or a namespace should explicitly create a thread
which should do this.

Oleg.

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