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

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Date:   Mon, 8 Jun 2020 20:36:31 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...ia.fr>
To:     Markus Elfring <Markus.Elfring@....de>
cc:     Denis Efremov <efremov@...ux.com>,
        Coccinelle <cocci@...teme.lip6.fr>,
        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()



On Mon, 8 Jun 2020, Markus Elfring wrote:

> …
> +++ b/scripts/coccinelle/api/memdup_user.cocci
> @@ -39,6 +39,28 @@ …
> …
> > +@...ends on patch@
> > +expression from,to,size;
> > +identifier l1,l2;
> > +@@
> > +
> > +-  to = \(kvmalloc\|kvzalloc\)(size,\(GFP_KERNEL\|GFP_USER\));
> > ++  to = vmemdup_user(from,size);
>
> I suggest to combine the desired adjustment with the previous SmPL rule
> by using another disjunction.
>
>
> > +@rv depends on !patch@
> > +expression from,to,size;
> > +position p;
> > +statement S1,S2;
> > +@@
> > +
> > +*  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.

julia