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

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Message-ID: <20101224164043.GA10557@genesis.frugalware.org>
Date:	Fri, 24 Dec 2010 17:40:43 +0100
From:	Miklos Vajna <vmiklos@...galware.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Mike Galbraith <efault@....de>,
	shenghui <crosslonelyover@...il.com>,
	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
	mingo@...e.hu, Greg KH <greg@...ah.com>,
	Paul Turner <pjt@...gle.com>,
	Yong Zhang <yong.zhang0@...il.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Paul Menage <menage@...gle.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>
Subject: Re: [PATCH] sched, cgroup: Use exit hook to avoid use-after-free
 crash

> Subject: sched, cgroup: Use exit hook to avoid use-after-free crash
> 
> By not notifying the controller of the on-exit move back to
> init_css_set, we fail to move the task out of the previous cgroup's
> cfs_rq. This leads to an opportunity for a cgroup-destroy to come in and
> free the cgroup (there are no active tasks left in it after all) to
> which the not-quite dead task is still enqueued.
> 
> Cc: stable@...nel.org
> Reported-by: Miklos Vajna <vmiklos@...galware.org>
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> ---
>  kernel/sched.c |   10 ++++++++++
>  1 files changed, 10 insertions(+), 0 deletions(-)

Thanks! :)

Reported-and-tested-by: Miklos Vajna <vmiklos@...galware.org>

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