linux-kernel - Re: Racy manipulation of task_struct->flags in cgroups code causes hard to reproduce kernel panics

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Message-ID: <20140920143012.GL2832@worktop.localdomain>
Date:	Sat, 20 Sep 2014 16:30:12 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Zefan Li <lizefan@...wei.com>
Cc:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	mingo@...hat.com, tj@...nel.org, akpm@...ux-foundation.org,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
	fernando_b1@....ntt.co.jp, keescook@...omium.org
Subject: Re: Racy manipulation of task_struct->flags in cgroups code causes
 hard to reproduce kernel panics

On Sat, Sep 20, 2014 at 01:55:54PM +0800, Zefan Li wrote:
> We should make the updating of this flag atomic.

>  /* Per-process atomic flags. */
>  #define PFA_NO_NEW_PRIVS 0x00000001	/* May not gain new privileges. */
> +#define PFA_SPREAD_PAGE  0x00000002	/* Spread page cache over cpuset */
> +#define PFA_SPREAD_SLAB  0x00000004	/* Spread some slab caches over cpuset */

Ooh, I was not ware we had those.. /me checks where that came from. Hmm
weird, while I did get that patch it had a seccomp prefix when landing
in my inbox so I ignored it. However the commit has a sched prefix
(which I would not have ignored). Dubious things happened here.


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