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

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Date:	Wed, 3 Aug 2011 09:50:26 +0200
From:	Manuel Lauss <manuel.lauss@...glemail.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Vasiliy Kulikov <segoon@...nwall.com>,
	linux-kernel@...r.kernel.org, Richard Weinberger <richard@....at>,
	Marc Zyngier <maz@...terjones.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	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 9:43 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Tue, Aug 2, 2011 at 2:45 AM, Vasiliy Kulikov <segoon@...nwall.com> wrote:
>>
>> From: Vasiliy Kulikov <segoon@...nwall.com>
>> Subject: [PATCH] shm: fix a race between shm_exit() and shm_init()
>
> This patch is disgusting.
>
> Doing things like this:
>
>> +       /*
>> +        * For init_ipc_ns shm_ids().rw_mutex is statically initialized
>> +        * as kernel threads should be able to use it in do_exit() before
>> +        * shm_init(), which is called on do_initcall()
>> +        */
>> +       if (ns == &init_ipc_ns)
>> +               __ipc_init_ids(&shm_ids(ns));
>> +       else
>> +               ipc_init_ids(&shm_ids(ns));
>
> should have told you that there is something totally wrong with your patch.
>
> I'd prefer to really do the initialization in the allocator (at which
> point it would be very natural to do the initialization statically for
> a static allocation, and you wouldn't have the above kind of nasty
> conditional stuff), but that whole namespace initialization and setup
> just looks pretty nasty.
>
> Looking at some of the other cases like net_ns_init(), maybe the
> proper fix is to just make 'ipc_ns_init()' be a pure_initcall().
>
> Does the attached patch work?

No, same oops still.

Manuel
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