linux-kernel - Re: [PATCH v2 2/4] coccinelle: api: extend memdup_user rule with vmemdup

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Date:   Mon, 8 Jun 2020 21:24:44 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     Julia Lawall <julia.lawall@...ia.fr>,
        Denis Efremov <efremov@...ux.com>,
        Coccinelle <cocci@...teme.lip6.fr>
Cc:     Gilles Muller <Gilles.Muller@...6.fr>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nicolas Palix <nicolas.palix@...g.fr>,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/4] coccinelle: api: extend memdup_user rule with
 vmemdup_user()

>>> +*  to = \(kvmalloc@p\|kvzalloc@p\)(size,\(GFP_KERNEL\|GFP_USER\));
>>> +   if (to==NULL || ...) S1
>>> +   if (copy_from_user(to, from, size) != 0)
>>> +   S2
>>
>> How does the SmPL asterisk functionality fit to the operation
>> modes “org” and “report”?
>
> Make coccicheck uses --no-show-diff for org and report modes, so the * has
> no effect in those cases.

* Can it be nicer to generate only required data for each operation mode?

* Would you like to compare the usage of this command parameter with other
  design approaches?

Regards,
Markus