linux-kernel - Re: [PATCH v2] selftests: prctl: Add new prctl test for PR_SET

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Date:   Fri, 21 Jul 2023 10:30:23 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Osama Muhammad <osmtendev@...il.com>
Cc:     shuah@...nel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v2] selftests: prctl: Add new prctl test for PR_SET_NAME

On 7/14/23 10:21, Shuah Khan wrote:
> On 6/26/23 12:36, Osama Muhammad wrote:
>> Hi Shuah,
>>
>> Any feedback on this patch?.
>>
>> Thanks,
>> Osama
>>
>>
> 
> Please don't top post when you are responding on kernel
> mailing lists. It gets very difficult to follow the
> comments in the email thread.
> 
>> On Sat, 17 Jun 2023 at 18:01, Osama Muhammad <osmtendev@...il.com> wrote:
>>>
>>> Hi,
>>>
>>> Yes, I did install the latest kernel headers and TASK_COMM_LEN is not
>>> accessible in userspace.
>>>
>>> I looked into the test which uses TASK_COMM_LEN but the test defines
>>> it in its own header file.
>>>
>>> Example:  https://elixir.bootlin.com/linux/latest/source/tools/testing/selftests/bpf/progs/pyperf.h#L13
> 
> bfp test does things differently because its dependencies
> on run-time environment.
> 
>>>
>>> TASK_COMM_LEN is defined in include/linux/sched.h, but this header
>>> file is not exposed to userspace.
> 
> Correct. you can include linux/sched.h like other tests do
> Take a look at tools/testing/selftests/clone3
> 

You are right about TASK_COMM_LEN not visible to user-space.
This patch has been applied to linux-kselftest next for 6.6-rc1

thanks,
-- Shuah