linux-kernel - Dumping the checksums in a module

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Message-ID: <464DC019.6010008@free.fr>
Date:	Fri, 18 May 2007 17:02:49 +0200
From:	John Sigler <linux.kernel@...e.fr>
To:	linux-kernel@...r.kernel.org
Subject: Dumping the checksums in a module

Hello everyone,

I'm getting "disagrees about version of symbol struct_module" messages, 
and I'm trying to understand why.

As far as I understand (which is not very far), if I define 
CONFIG_MODVERSIONS, then checksums for various functions (all exported 
functions?) and various structures (which ones?) will be included inside 
the kernel image, and written to Module.symvers. When an out-of-tree 
module is built, it will also include these checksums.

How do I list the checksums within a module?

$ /sbin/modinfo -V
module-init-tools version 3.2.2

$ uname -a
Linux venus 2.6.18.6 #1 PREEMPT Thu Feb 8 18:04:49 CET 2007 i686 
pentium4 i386 GNU/Linux

$ /sbin/modinfo test.ko
filename:       test.ko
vermagic:       2.6.20.7-rt8 preempt mod_unload PENTIUMIII REGPARM
depends:
parm:           pConfig_file:charp
parm:           allocator_himem:An integer (int)
parm:           EnableIdleMode:An integer (int)
parm:           Board_ID:An integer (int)
parm:           Diagnostic:An integer (int)

$ hexdump -C test.ko | grep -A2 struct_
000752e0  17 98 07 0e 73 74 72 75  63 74 5f 6d 6f 64 75 6c 
|....struct_modul|
000752f0  65 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 
|e...............|
00075300  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 
|................|

I think this means that, in this module, the checksum for symbol 
struct_module is 0x1798070e, right?

Is there a simpler way to list all the checksums?

Regards.
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