[ldv-project] Queries in running the LDV.

[Puneet Gupta]

Hi Alexey,

Thanks for your mail.

I have downloaded the klever package and managed to install it also by following the instructions given in the "local deployment" section.
https://buildmedia.readthedocs.org/media/pdf/klever/latest/klever.pdf

Can you guide me how to run the klever tool on my kernel module? Is there any doc which I can follow in which step by step the instructions are given?

Currently I have my kernel module as a tar.bz2 and I want to do static analysis on it.

I tried running ,

  *   cd bridge
  *   python3 manage.py test

I got the following error:
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/group/cdc_hd/members/puneetg/kernel_static_analysis/klever/klever-inst/klever/bridge/bridge/__init__.py", line 21, in <module>
    from bridge.settings import DATABASES
ModuleNotFoundError: No module named 'bridge.settings'

I can also see "linux-3.14.79.tar.xz" tar file in "build bases" directory. Shall I need to place my external module tar file in that directory and run some tests?

Thanks,
Puneet


From: Alexey Khoroshilov <khoroshilov at ispras.ru>
Sent: Friday, June 21, 2019 9:16 PM
To: Puneet Gupta <PUNEETG at xilinx.com>; ldv-project at linuxtesting.org
Subject: Re: Queries in running the LDV.


EXTERNAL EMAIL
Dear Puneet,

It seems you use LDV Tools, but it was superseded by our newer KLEVER Framework [1,2].
So, we suggest to use the newer tool.

As for memory leak rule, we had a prototype of such rule in LDV Tools (104 [3]), but it was not maintained and it is not available in KLEVER. So, we suggest to check code against some memory safety rules ((KLEVER rule id: "linux:memory safety", please note that string operations are not supported yet) or some Linux specific rules like mutex lock [4] or clock_enable/clock_disable [5].

[1] http://linuxtesting.org/04-07-2018
[2] https://forge.ispras.ru/projects/klever
[3] https://forge.ispras.ru/issues/2735
[4] https://forge.ispras.ru/issues/1940 (KLEVER rule ids: "linux:kernel:locking:mutex")
[5] https://forge.ispras.ru/issues/8785 (KLEVER rule ids: "linux:drivers:clk1", "linux:drivers:clk2")

Best regards,
Alexey Khoroshilov
Linux Verification Center, ISPRAS


On 21.06.2019 8:30, Puneet Gupta wrote:
Hi,

I am using LDV for running static analysis for my external driver.

I have few questions :

  *   The driver has many files to be compiled, but it seems the LDV is only reporting out the errors for the file which is mentioned in 'obj-m'. How can I get result for all the files?
  *   What is meant by the error: "attempting to take field offset lock of expression priv at stop whose value is Top". I am getting only these errors for my file.
  *   To test the LDV , I did kmalloc and didn't freed the memory returned. But the output on the webpage is not showing an error for that memory leak. Have I need to pass some separate rule for detecting the memory leaks?

I am using 32_7a rule for running the driver, as given in the example in the LDV standard doc.

Thanks,
Puneet
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