linux-kernel - Re: NULL pointer dereference when loading the gre module (3.10.0-rc4)

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Message-ID: <20130607183438.GA23064@uio.no>
Date:	Fri, 7 Jun 2013 20:34:38 +0200
From:	"Steinar H. Gunderson" <sgunderson@...foot.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	linux-kernel@...r.kernel.org, davem@...emloft.net,
	netdev@...r.kernel.org, Rusty Russell <rusty@...tcorp.com.au>,
	Pravin B Shelar <pshelar@...ira.com>
Subject: Re: NULL pointer dereference when loading the gre module (3.10.0-rc4)

On Fri, Jun 07, 2013 at 02:26:08PM -0400, Steven Rostedt wrote:
> On Fri, 2013-06-07 at 19:52 +0200, Steinar H. Gunderson wrote:
> Ah, that's because of this: module_init(ipgre_init);  Where it makes it
> into:
> 
> 00000000 <init_module>:
>    0:   55                      push   %ebp
>    1:   89 e5                   mov    %esp,%ebp
>    3:   53                      push   %ebx
>    4:   83 ec 08                sub    $0x8,%esp
>    7:   c7 04 24 00 00 00 00    movl   $0x0,(%esp)
>                         a: R_386_32     .rodata.str1.4
> 
> We can use ipgre_tap_init_net, and the offset of 0xb032 (45106) as that
> was 0xffffffffa0e5d034 - 0xffffffffa0e52002. Do you have CONFIG_NET_NS
> set?

ipgre_tap_init_net is 000000000000001a, but there's no way I can subtract
0xb053 from that? Sorry, I'm confused. :-)

> You can also cat /proc/modules. It gives you where the modules are
> located.

I've booted back to 3.9.x already; I couldn't live with a crashing kernel like
that. Unfortunately it's not that easy for me to reboot this machine all the
time either. :-/

/* Steinar */
-- 
Homepage: http://www.sesse.net/
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