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

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Date:	Wed, 3 Aug 2011 11:30:33 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Vasiliy Kulikov <segoon@...nwall.com>,
	Manuel Lauss <manuel.lauss@...glemail.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Richard Weinberger <richard@....at>,
	Ingo Molnar <mingo@...e.hu>,
	"kernel-hardening@...ts.openwall.com" 
	<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, 3 Aug 2011 09:19:24 +0100
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?

Here you go:

SMP: Total of 4 processors activated (334.95 BogoMIPS).
[<c0014754>] (unwind_backtrace+0x0/0xf4) from [<c003ed78>] (call_usermodehelper_exec+0x108/0x118)
[<c003ed78>] (call_usermodehelper_exec+0x108/0x118) from [<c01760ac>] (kobject_uevent_env+0x40c/0x450)
[<c01760ac>] (kobject_uevent_env+0x40c/0x450) from [<c01754e8>] (kset_register+0x3c/0x44)
[<c01754e8>] (kset_register+0x3c/0x44) from [<c01c2ed0>] (bus_register+0xac/0x28c)
[<c01c2ed0>] (bus_register+0xac/0x28c) from [<c042227c>] (platform_bus_init+0x20/0x40)
[<c042227c>] (platform_bus_init+0x20/0x40) from [<c04222f4>] (driver_init+0x18/0x24)
[<c04222f4>] (driver_init+0x18/0x24) from [<c040e270>] (kernel_init+0x84/0x13c)
[<c040e270>] (kernel_init+0x84/0x13c) from [<c000f630>] (kernel_thread_exit+0x0/0x8)
[<c0014754>] (unwind_backtrace+0x0/0xf4) from [<c003ed78>] (call_usermodehelper_exec+0x108/0x118)
[<c003ed78>] (call_usermodehelper_exec+0x108/0x118) from [<c01760ac>] (kobject_uevent_env+0x40c/0x450)
[<c01760ac>] (kobject_uevent_env+0x40c/0x450) from [<c01754e8>] (kset_register+0x3c/0x44)
[<c01754e8>] (kset_register+0x3c/0x44) from [<c01c1f0c>] (sysdev_class_register+0x60/0x8c)
[<c01c1f0c>] (sysdev_class_register+0x60/0x8c) from [<c040e270>] (kernel_init+0x84/0x13c)
[<c040e270>] (kernel_init+0x84/0x13c) from [<c000f630>] (kernel_thread_exit+0x0/0x8)
NET: Registered protocol family 16
L2x0 series cache controller enabled

driver_init() is called from do_basic_setup(), before any initcall...

	M.
-- 
I'm the slime oozin' out from your TV set...

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