[CentOS] C7 Kernel module compilation

Mon Aug 5 16:01:01 UTC 2019
Alessandro Baggi <alessandro.baggi at gmail.com>

Il 05/08/19 17:49, Akemi Yagi ha scritto:
> On Mon, Aug 5, 2019 at 8:42 AM Alessandro Baggi
> <alessandro.baggi at gmail.com> wrote:
>>
>> Il 05/08/19 17:30, Akemi Yagi ha scritto:
>>> On Mon, Aug 5, 2019 at 6:46 AM Alessandro Baggi
>>> <alessandro.baggi at gmail.com> wrote:
>>>>
>>>> Hey there,
>>>> I'm trying to compile a single module following this guide:
>>>>
>>>> https://wiki.centos.org/HowTos/BuildingKernelModules#head-d2e4c05886f94c701e4ae74387d41d8c40c25d01
>>>>
>>>> and
>>>>
>>>> https://wiki.centos.org/HowTos/I_need_the_Kernel_Source
>>>>
>>>> I tried to compile a module for novuton led controller supplied by
>>>> thirdparty and I got several error.
>>>>
>>>> To check if this is the wrong procedure I tried to compile cifs module
>>>> as listed in howto but when loading with modprobe I get "Exec format
>>>> error", and from dmesg "cifs: no symbol version for module_layout
>>>> ", the same errors when compiling novuton module and I don't know why I
>>>> get this error.
>>>
>>> When following the instructions in BuildingKernelModules, which kernel
>>> version did you use? Also, after the "depmod -a" step, what is the
>>> output from:
>>>
>>> $ modinfo cifs | grep filename
>>>
>>>> I noticed that modules in centos are compressed in .xz but after running
>>>> make M=fs/cifs I got only a .ko kernel module and then I run xz to
>>>> compress the new module.
>>>
>>> Compressing modules is optional. Uncompressed form is functionally the
>>> same (of course it saves some disk space).
>>>
>>>> Can someone help me please?
>>>>
>>>> Thanks in advance.
>>>
>>> Akemi
>>
>> Hi Akemi,
>> thank you for your answer.
>>
>> Kernel version used is 3.10.0-957.27.2.el7.x86_64
>>
>> [root at c7-test SPECS]# modinfo cifs | grep filename
>> filename:       /lib/modules/3.10.0-957.27.2.el7.x86_64/extra/cifs.ko
> 
> Looking good. I assume your running kernel is 3.10.0-957.27.2.el7 ?
> 
> Akemi
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Reading from dmesg seems that the module is not accepted by kernel due 
to invalid signature. I need to sign the module with a key?

Thanks in advance