linux-kernel - Re: [PATCH V4] cgroup/cpuset: Prevent UAF in proc_cpuset

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Message-ID: <ZoGP6uV2oD4AdYWP@slm.duckdns.org>
Date: Sun, 30 Jun 2024 07:03:38 -1000
From: Tejun Heo <tj@...nel.org>
To: Markus Elfring <Markus.Elfring@....de>
Cc: Chen Ridong <chenridong@...wei.com>, cgroups@...r.kernel.org,
	Aditya Kali <adityakali@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Koutný <mkoutny@...e.com>,
	Serge Hallyn <sergeh@...nel.org>, Waiman Long <longman@...hat.com>,
	Zefan Li <lizefan.x@...edance.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V4] cgroup/cpuset: Prevent UAF in proc_cpuset_show()

Hello,

On Sun, Jun 30, 2024 at 11:20:58AM +0200, Markus Elfring wrote:
> Under which circumstances would you become interested to apply statements
> like the following?
> 
> * guard(rcu)();
>   https://elixir.bootlin.com/linux/v6.10-rc5/source/include/linux/rcupdate.h#L1093
> 
> * guard(spinlock_irq)(&css_set_lock);
>   https://elixir.bootlin.com/linux/v6.10-rc5/source/include/linux/spinlock.h#L567

I don't really care either way. Neither makes meaningful difference here.

Thanks.

-- 
tejun