linux-kernel - Re: [PATCH RESEND 2/2] Fix some kallsyms

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Date:	Fri, 16 Mar 2007 12:51:54 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Alexey Dobriyan <adobriyan@...ru>
Cc:	akpm@...l.org, linux-kernel@...r.kernel.org, devel@...nvz.org,
	tglx@...utronix.de, viro@...iv.linux.org.uk, rusty@...tcorp.com.au,
	pmarques@...popie.com
Subject: Re: [PATCH RESEND 2/2] Fix some kallsyms_lookup() vs rmmod races


* Alexey Dobriyan <adobriyan@...ru> wrote:

> [cc'ing folks whose proc files are affected]
> 
> kallsyms_lookup() can call module_address_lookup() which iterates over 
> modules list without module_mutex taken. Comment at the top of 
> module_address_lookup() says it's for oops resolution so races are 
> irrelevant, but in some cases it's reachable from regular code:

looking at the problem from another angle: wouldnt this be something 
that would benefit from freeze_processes()/unfreeze_processes(), and 
hence no locking would be required?

	Ingo
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