linux-kernel - Re: Module init call vs symbols exporting race?

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Message-Id: <200711062341.34566.rusty@rustcorp.com.au>
Date:	Tue, 6 Nov 2007 23:41:34 +1100
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Pavel Emelyanov <xemul@...nvz.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Module init call vs symbols exporting race?

On Tuesday 06 November 2007 20:20:58 Pavel Emelyanov wrote:
> Hi.
>
> I looked at the sys_init_module() and found that the ->init callback
> for the module is called without the module_mutex held and *after*
> the module's symbols are exported. Doesn't this create the race when
> loading two modules in parallel? Like this.

Hi Pavel,

	In a word, no.  See "strong_try_module_get()".

Cheers,
Rusty.
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