linux-kernel - Re: [PATCH] Change task

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Message-ID: <20140324154348.GA20004@madcap2.tricolour.ca>
Date:	Mon, 24 Mar 2014 11:43:48 -0400
From:	Richard Guy Briggs <rgb@...hat.com>
To:	James Morris <jmorris@...ei.org>
Cc:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	peterz@...radead.org, paulmck@...ux.vnet.ibm.com,
	laijs@...fujitsu.com, akpm@...ux-foundation.org, joe@...ches.com,
	keescook@...omium.org, geert@...ux-m68k.org, jkosina@...e.cz,
	viro@...iv.linux.org.uk, davem@...emloft.net,
	linux-kernel@...r.kernel.org, mingo@...e.hu, rostedt@...dmis.org,
	tglx@...utronix.de, linux-security-module@...r.kernel.org
Subject: Re: [PATCH] Change task_struct->comm to use RCU.

On 14/03/12, James Morris wrote:
> On Tue, 11 Mar 2014, Tetsuo Handa wrote:
> > And the same phrase goes to James Morris...
> > 
> > If you are sure that it is safe to use get_task_comm() from
> > dump_common_audit_data() and you prefer locked version, please pick up below
> > patch via your git tree.
> > 
> > If you are unsure or prefer lockless version, I'll make a lockless version
> > using do_get_task_comm() proposed in this thread.
> 
> If you can't understand whether your patch is correct or not, don't ask me 
> to apply it to my tree.
> 
> If you're unsure, get it reviewed first.

I looked at the calling function tree back a number of steps and didn't
see any other evidence of task locks held, so I'm comfortable with this
patch and would prefer it to either memcpy() or do_get_task_comm(), but
would still like to get an opinion from others.

> - James

- RGB

--
Richard Guy Briggs <rbriggs@...hat.com>
Senior Software Engineer, Kernel Security, AMER ENG Base Operating Systems, Red Hat
Remote, Ottawa, Canada
Voice: +1.647.777.2635, Internal: (81) 32635, Alt: +1.613.693.0684x3545
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