linux-kernel - Re: [PATCH] af_key: fix netns ops ordering on module load/unload

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Message-ID: <1265032590.2848.40.camel@edumazet-laptop>
Date:	Mon, 01 Feb 2010 14:56:30 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Luca Tettamanti <kronos.it@...il.com>
Cc:	Alexey Dobriyan <adobriyan@...il.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH] af_key: fix netns ops ordering on module load/unload

Le lundi 01 février 2010 à 14:50 +0100, Luca Tettamanti a écrit :
> On Sat, Jan 30, 2010 at 1:53 PM, Alexey Dobriyan <adobriyan@...il.com> wrote:

> > [PATCH] af_key: fix netns ops ordering on module load/unload
> >
> > 1. After sock_register() returns, it's possible to create sockets,
> >   even if module still not initialized fully (blame generic module code
> >   for that!)
> > 2. Consequently, pfkey_create() can be called with pfkey_net_id still not
> >   initialized which will BUG_ON in net_generic():
> >        kernel BUG at include/net/netns/generic.h:43!
> > 3. During netns shutdown, netns ops should be unregistered after
> >   key manager unregistered because key manager calls can be triggered
> >   from xfrm_user module:
> >
> >        general protection fault: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
> >        pfkey_broadcast+0x111/0x210 [af_key]
> >        pfkey_send_notify+0x16a/0x300 [af_key]
> >        km_state_notify+0x41/0x70
> >        xfrm_flush_sa+0x75/0x90 [xfrm_user]
> > 4. Unregister netns ops after socket ops just in case and for symmetry.
> >
> > Reported by Luca Tettamanti.
> >
> > Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
> 
> Tested-by: Luca Tettamanti <kronos.it@...il.com>

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>



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