linux-kernel - [PATCH 0/4] mempolicy: fix show_numa_map() vs exec() + do_set

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Message-ID: <20140821190020.GA8703@redhat.com>
Date:	Thu, 21 Aug 2014 21:00:20 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 0/4] mempolicy: fix show_numa_map() vs exec() +
	do_set_mempolicy() race

On 08/20, Oleg Nesterov wrote:
>
> I belive that 9e7814404b77c3e8 "hold task->mempolicy while numa_maps scans"
> was wrong and it doesn't fix the problem.

See 2/4.

> I'll try to send the fix tomorrow, could you review the initial preparations?
> To me, these changes make sense as cleanups in any case, but I don't really
> understand this code and this was only compile tested.

Untested again because I do not know how, please review ;) On top of
"mempolicy: get_task_policy() cleanups/preparations" series.

I'll send the final cleanups later.

Oleg.

 fs/proc/task_mmu.c        |   33 ++++++-----------------
 include/linux/mempolicy.h |    5 ++-
 mm/mempolicy.c            |   64 +++++++++++++++++++-------------------------
 3 files changed, 40 insertions(+), 62 deletions(-)

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