linux-kernel - Re: s390/pkey: Use memdup_user() rather than duplicating its implementation

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Message-ID: <298c5ecf-2fc7-b604-b97a-85c0717cafc9@web.de>
Date:   Wed, 6 Nov 2019 20:18:05 +0100
From:   Markus Elfring <Markus.Elfring@....de>
To:     Joe Perches <joe@...ches.com>, linux-s390@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Cc:     Christian Bornträger <borntraeger@...ibm.com>,
        Harald Freudenberger <freude@...ux.ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Ingo Franzki <ifranzki@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: s390/pkey: Use memdup_user() rather than duplicating its
 implementation

>>> There is no bug here.
>>
>> Do you find duplicated source code questionable?
>
> No.

Do you disagree to the following information which can be provided by
a coccicheck run?

./drivers/s390/crypto/pkey_api.c:722:8-15: WARNING opportunity for memdup_user


> It is something that can be improved through
> code consolidation though.
>
>> Is this also an error item?
>
> Definitely not.

Your view seems to be very limited at the moment.


> It is _only_ an error if there is some logic defect.
> There is no logic defect here.

I suggest to consider additional software weaknesses besides logic errors.
Do we occasionally care any more for the development principle
“Don't repeat yourself”?

Regards,
Markus