Re: [PATCH] sched, cgroup: Use exit hook to avoid use-after-free crash

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To: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Subject: Re: [PATCH] sched, cgroup: Use exit hook to avoid use-after-free crash
From: Mike Galbraith <efault@xxxxxx>
Date: Fri, 24 Dec 2010 17:48:17 +0100
Cc: Miklos Vajna <vmiklos@xxxxxxxxxxxxxx>, shenghui <crosslonelyover@xxxxxxxxx>, kernel-janitors@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, mingo@xxxxxxx, Greg KH <greg@xxxxxxxxx>, Paul Turner <pjt@xxxxxxxxxx>, Yong Zhang <yong.zhang0@xxxxxxxxx>, Li Zefan <lizf@xxxxxxxxxxxxxx>, Paul Menage <menage@xxxxxxxxxx>, Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx>, Srivatsa Vaddagiri <vatsa@xxxxxxxxxx>
In-reply-to: <1293206353.29444.205.camel@laptop>

On Fri, 2010-12-24 at 16:59 +0100, Peter Zijlstra wrote:

> So cgroup moves a task without calling cgroup_subsys::attach() which is
> odd, but it does have an ::exit method, sadly it calls that _before_
> re-assigning the task, which means we have to jump through some hoops.

Could you do the move in cgroup_exit() in the CONFIG_PREEMPT case?

	-Mike


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Follow-Ups:
- Re: [PATCH] sched, cgroup: Use exit hook to avoid use-after-free crash
  - From: Peter Zijlstra

References:
- [PATCH] avoid race condition in pick_next_task_fair in kernel/sched_fair.c
  - From: shenghui
- Re: [PATCH] avoid race condition in pick_next_task_fair in kernel/sched_fair.c
  - From: Peter Zijlstra
- Re: [PATCH] avoid race condition in pick_next_task_fair in kernel/sched_fair.c
  - From: Miklos Vajna
- Re: [PATCH] avoid race condition in pick_next_task_fair in kernel/sched_fair.c
  - From: Miklos Vajna
- Re: [PATCH] avoid race condition in pick_next_task_fair in kernel/sched_fair.c
  - From: Peter Zijlstra
- Re: [PATCH] avoid race condition in pick_next_task_fair in kernel/sched_fair.c
  - From: Mike Galbraith
- Re: [PATCH] avoid race condition in pick_next_task_fair in kernel/sched_fair.c
  - From: Peter Zijlstra
- Re: [PATCH] avoid race condition in pick_next_task_fair in kernel/sched_fair.c
  - From: Miklos Vajna
- Re: [PATCH] avoid race condition in pick_next_task_fair in kernel/sched_fair.c
  - From: Peter Zijlstra
- Re: [PATCH] avoid race condition in pick_next_task_fair in kernel/sched_fair.c
  - From: Peter Zijlstra
- Re: [PATCH] avoid race condition in pick_next_task_fair in kernel/sched_fair.c
  - From: Miklos Vajna
- Re: [PATCH] avoid race condition in pick_next_task_fair in kernel/sched_fair.c
  - From: Peter Zijlstra
- Re: [PATCH] avoid race condition in pick_next_task_fair in kernel/sched_fair.c
  - From: Peter Zijlstra
- Re: [PATCH] avoid race condition in pick_next_task_fair in kernel/sched_fair.c
  - From: Yong Zhang
- Re: [PATCH] avoid race condition in pick_next_task_fair in kernel/sched_fair.c
  - From: Peter Zijlstra
- Re: [PATCH] avoid race condition in pick_next_task_fair in kernel/sched_fair.c
  - From: Peter Zijlstra
- Re: [PATCH] avoid race condition in pick_next_task_fair in kernel/sched_fair.c
  - From: Peter Zijlstra
- [PATCH] sched, cgroup: Use exit hook to avoid use-after-free crash
  - From: Peter Zijlstra

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