Re: Query regarding kernel modules intercepting system call.

[Lino Sanfilippo]

On 09.07.2017 12:06, Lino Sanfilippo wrote:
> Hi,
> 
> On 08.07.2017 17:38, Ajinkya Surnis wrote:
>> The purpose of assignment is to check the authenticity of the user
>> executing the system call, and prevent certain users from executing, kind
>> of like certain security programs (although I don't exactly know how they
>> work).
>>
> 
> I suggest to take a look at "fanotify", which offers you the possibility
> to intercept open() calls at VFS level and also provides you with the
> user/group id of the file accessing process.
> 

Actually you are provided the file descriptor of the accessed file and the
pid of the accessing process. But it is not too hard to derive access rights
(e.g. via stat() or fstat()) from these. 

Regards,
Lino

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Re: Query regarding kernel modules intercepting system call.

[Lino Sanfilippo]

Hi,

On 08.07.2017 17:38, Ajinkya Surnis wrote:
> The purpose of assignment is to check the authenticity of the user
> executing the system call, and prevent certain users from executing, kind
> of like certain security programs (although I don't exactly know how they
> work).
> 

I suggest to take a look at "fanotify", which offers you the possibility
to intercept open() calls at VFS level and also provides you with the
user/group id of the file accessing process.


Regards,
Lino


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Re: Patch Question

[Lino Sanfilippo]

On 19.04.2017 18:46, Perry Hooker wrote:
> 
> Understood. I'm still open to the possibility that I've made a mistake
> - I don't want to re-submit the patch if my analysis is incorrect.
> 
> Maybe I didn't make it clear (my apologies if so) - what I'm really
> looking for here is help confirming or refuting my work. If
> re-submitting the patch is the best way to do this, then I can
> certainly go that route.
> 

Before you do this you should double check that the raised objections are 
indeed not justified. 
I have not looked too deep into the code but in function WILC_WFI_p2p_rx() the 
buffer 
is conditionally passed to cfg80211_rx_mgmt() which handles the passed data as 
being little endian.
To me this is a strong indication that the data in the buffer is also little 
endian (which is what
Dan pointed out and why the change you propose is not correct).

Regards,
Lino


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Re: Patch Question

[Lino Sanfilippo]

Hi,

On 18.04.2017 01:28, Perry Hooker wrote:
> Hi everyone,
> 
> I recently submitted a patch to the kernel mailing list:
> https://lkml.org/lkml/2017/3/21/712
> 
> I received some feedback on the patch. After a bit of polite
> back-and-forth, the respondent stopped replying when I asked for more
> information, and I haven't heard anything from the maintainers.
> 
> Based on my analysis (contained in the thread), I still think the
> patch is correct & appropriate.

As far as I understood Dan Carpenters (last) post in that thread, the content 
in the buffer
is already in little endian order. In this case the code is correct as it is 
and there is no need 
for the change you propose.


Regards,
Lino


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Re: Welcome to the "Kernelnewbies" mailing list

[Lino Sanfilippo]

Hi,

On 11.04.2017 02:10, juan pedro meriño wrote:
> Hi!
> 
> I have been looking at versions 1,2,3 and 4 of the linux kernel. I would
> like to know what are the programs for the kernel development environment.
> To test them and add new features.
> 
> Thank you very much!

Please take a look at this site:

https://www.kernel.org/doc/html/latest/dev-tools/index.html

I suggest that you also take a look at the eudyptula challenge:
http://eudyptula-challenge.org/


>> You must know your password to change your options (including changing
>> the password, itself) or to unsubscribe.  It is:
>>
>>   juanpepe
>>

Did you notice that you have just made your password public to the whole world?

Regards,
Lino


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Re: Problem in First-Patch-Tutorial

[Lino Sanfilippo]

Hi,

On 12.03.2017 13:15, SIMRAN SINGHAL wrote:
> On Sun, Mar 12, 2017 at 4:04 PM, Varsha Rao  wrote:
>> Hello Simran,
>>
>>> In Reloading Modules I tried the first command it works fine for me.
>>>
>>> git/kernels/staging$ ls drivers/iio/dummy/*.ko
>>> drivers/iio/dummy/iio_dummy_evgen.ko  drivers/iio/dummy/iio_dummy.ko
>>>
>>> Then I tried to run second-command
>>>
>>> git/kernels/staging$ sudo modprobe -r iio_dummy_evgen
>>>
>>> I got the following error:-
>>> modprobe: FATAL: Module iio_dummy_evgen not found.
>>
>>   Maybe as iio_dummy_evgen is not loaded it causes this error.
>>
>>> I am not getting what is wrong with this.
>>
>> You need to execute commands in following order
>>
>> make drivers/iio/dummy/iio_dummy_evgen.ko
>> make drivers/iio/dummy/iio_dummy.ko
>>
>> sudo modprobe iio_dummy_evgen
>> sudo modprobe iio_dummy
>>
>> Check if they are loaded successfully with lsmod | grep "iio".
>>
>> Thanks,
>> Varsha
> 
> This is also not working. I am getting this error now:
> modprobe: FATAL: Module iio_dummy_evgen not found in directory
> /lib/modules/4.10.0-rc3+
> 
> I am basically trying to do the Task1 of IIO. Here is the link:-
> https://kernelnewbies.org/IIO_tasks
> 
> In this task they have asked to use this:
> $ insmod iio_dummy_evgen.ko
> 
> As this was not working, so I tried modprobe.
> 


modprobe is just a wrapper around insmod. So if insmod does not work, modprobe 
wont either.
Could it be that the kernel you build the module for is not the kernel that you 
are currently
running? 

Regards,
Lino


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Re: Which repository to clone ?

[Lino Sanfilippo]

On 02.02.2017 00:38, srishti sharma wrote:
> Thanks for replying ,
> Does the one I cloned give me 2.6 kernel version , is this not being
> developed now ?
> Also why did I need to use gcc plugin-devs ?
> Regards
>

Yes, the one you tried is the (very old) 2.6 kernel. I dont know why you 
would have to install the plugin-devs. Which distro are you running?

Regards,
Lino


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Re: Which repository to clone ?

[Lino Sanfilippo]

Hi,

On 01.02.2017 23:09, srishti sharma wrote:
> Hey,
> I am an absolute newbie , I tried to clone greg kroah-hartman's
> staging tree repository , somehow I was not able to boot in the kernel
> I built .
>
> Also, Does this command below give me the latest kernel code ?
>
> I have tried to clone another repository using the command below
>
> git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
>
>

for the recent mainline kernel use 
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

Regards,
Lino


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