linux-kernel - Re: [PATCH next 3/3] selftests:connector: Add root check and fix arg error paths to skip

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Message-ID: <84048d13-9311-36f6-9eb4-8169952580d7@linuxfoundation.org>
Date:   Fri, 28 Jul 2023 16:25:55 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Anjali Kulkarni <anjali.k.kulkarni@...cle.com>
Cc:     Shuah Khan <shuah@...nel.org>,
        Liam Howlett <liam.howlett@...cle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH next 3/3] selftests:connector: Add root check and fix arg
 error paths to skip

On 7/28/23 15:59, Anjali Kulkarni wrote:
> 
> 
>> On Jul 28, 2023, at 2:41 PM, Shuah Khan <skhan@...uxfoundation.org> wrote:
>>
>> On 7/28/23 15:21, Anjali Kulkarni wrote:
>>>> On Jul 28, 2023, at 12:44 PM, Shuah Khan <skhan@...uxfoundation.org> wrote:
>>>>
>>>> On 7/28/23 13:06, Shuah Khan wrote:
>>>>> On 7/28/23 12:10, Anjali Kulkarni wrote:
>>>>>>
>>>>>>
>>>>>>> On Jul 28, 2023, at 10:29 AM, Shuah Khan <skhan@...uxfoundation.org> wrote:
>>>>>>>
>>>>>>> proc_filter test requires root privileges. Add root privilege check
>>>>>>> and skip the test. Also fix argument parsing paths to skip in their
>>>>>>> error legs.
>>>>>>>
>>>>>>> Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
>>>>>>> ---
>>>>>>> tools/testing/selftests/connector/proc_filter.c | 9 +++++++--
>>>>>>> 1 file changed, 7 insertions(+), 2 deletions(-)
>>>>>>>
>>>>>>> diff --git a/tools/testing/selftests/connector/proc_filter.c b/tools/testing/selftests/connector/proc_filter.c
>>>>>>> index 4fe8c6763fd8..7b2081b98e5c 100644
>>>>>>> --- a/tools/testing/selftests/connector/proc_filter.c
>>>>>>> +++ b/tools/testing/selftests/connector/proc_filter.c
>>>>>>> @@ -248,7 +248,7 @@ int main(int argc, char *argv[])
>>>>>>>
>>>>>>> if (argc > 2) {
>>>>>>> printf("Expected 0(assume no-filter) or 1 argument(-f)\n");
>>>>>>> - exit(1);
>>>>>>> + exit(KSFT_SKIP);
>>>>>>> }
>>>>>>>
>>>>>>> if (argc == 2) {
>>>>>>> @@ -256,10 +256,15 @@ int main(int argc, char *argv[])
>>>>>>> filter = 1;
>>>>>>> } else {
>>>>>>> printf("Valid option : -f (for filter feature)\n");
>>>>>>> - exit(1);
>>>>>>> + exit(KSFT_SKIP);
>>>>>>> }
>>>>>>> }
>>>>>>>
>>>>>>> + if (geteuid()) {
>>>>>>> + printf("Connector test requires root privileges.\n");
>>>>>>> + exit(KSFT_SKIP);
>>>>>>> + }
>>>>>>> +
>>>>>>
>>>>>> I am not sure why you have added this check? proc_filter does not need root privilege to run.
>>>>>>
>>>>> It failed for me when I ran it saying it requires root privileges.
>>>>> I had to run it as root.
>>>>
>>>> The following is what I see when I run the test as non-root
>>>> user:
>>>>
>>>> bind failed: Operation not permitted
>>>>
>>> Yes, that’s expected on a kernel which does not have the kernel patches submitted with this selftest installed on it.
>>> So this check for root needs to be removed.
>>
>> I will send v2 for this patch without root check. I should have
>> split the argument error paths and root check anyway.
>>
>> However, what is strange is if the test run by root, bind() doesn't fail.
>> This doesn't make sense to me based on what you said about bind() fails
>> if kernel doesn't support the new feature.
>>
> 
> I didn’t say that - part of the changes introduced by the patches is to remove the root check and add some features on top of existing code.
> 

Okay. So what should happen if a root user runs this test on a kernel
that doesn't have the kernel patches submitted with this selftest
installed on it?

thanks,
-- Shuah