linux-kernel - Re: [PATCH] shm: fix a race between shm_exit() and shm

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Message-ID: <CAOLZvyH50AzTx+E7GxwGs6HjL8cDyzVC58t1Wq-Ly4xJsG41sQ@mail.gmail.com>
Date:	Wed, 3 Aug 2011 12:04:01 +0200
From:	Manuel Lauss <manuel.lauss@...glemail.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Marc Zyngier <marc.zyngier@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Vasiliy Kulikov <segoon@...nwall.com>,
	linux-kernel@...r.kernel.org, Richard Weinberger <richard@....at>,
	Ingo Molnar <mingo@...e.hu>,
	kernel-hardening@...ts.openwall.com,
	"Paul E. McKenney" <paul.mckenney@...aro.org>
Subject: Re: [PATCH] shm: fix a race between shm_exit() and shm_init()

On Wed, Aug 3, 2011 at 10:19 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Tue, Aug 2, 2011 at 10:05 PM, Marc Zyngier <marc.zyngier@....com> wrote:
>>
>> Reordering the initcalls seems the easiest solution, but it is still very
>> fragile...
>
> So that's what I tried to do, by making it a "pure_initcall()". Even
> that didn't seem to be enough according to Manuel.
>
> Can you try my patch (that makes just that ipc ns init be a
> pure_initcall(), together with your hack on top of Andrew's? What is
> it that happens so early that even pure_initcall() hasn't been done
> yet?

I stuck a few printk's in the init path, the first "schedule()" in
init/main.c::rest_init()
starts it.  I don't know enough kernel (yet) to trace it further, sorry.

Manuel
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