linux-kernel - Re: [PATCH] User namespaces: Only put the userns when we unhash the uid

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Message-ID: <2f11576a0902130748h313864b6sa50ad038ab011fc0@mail.gmail.com>
Date:	Sat, 14 Feb 2009 00:48:42 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	David Howells <dhowells@...hat.com>
Cc:	torvalds@...l.org, jmorris@...ei.sys, akpm@...ux-foundation.org,
	serue@...ibm.com, mingo@...e.hu, linux-kernel@...r.kernel.org,
	vegard.nossum@...il.com, containers@...ts.osdl.org,
	snakebyte@....de
Subject: Re: [PATCH] User namespaces: Only put the userns when we unhash the 
	uid

> From: Serge E. Hallyn <serue@...ibm.com>
>
> uids in namespaces other than init don't get a sysfs entry.
>
> For those in the init namespace, while we're waiting to remove
> the sysfs entry for the uid the uid is still hashed, and
> alloc_uid() may re-grab that uid without getting a new
> reference to the user_ns, which we've already put in free_user
> before scheduling remove_user_sysfs_dir().
>
> Reported-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Signed-off-by: Serge E. Hallyn <serue@...ibm.com>
> Acked-by: David Howells <dhowells@...hat.com>
> Tested-by: Ingo Molnar <mingo@...e.hu>

ok, thanks good patch.
  Tested-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
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