linux-kernel - Re: [PATCH v3 2/3] coccinelle: api: extend memdup_user rule with vmemdup

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Date:   Tue, 21 Jul 2020 11:30:08 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     Denis Efremov <efremov@...ux.com>,
        Coccinelle <cocci@...teme.lip6.fr>,
        Gilles Muller <Gilles.Muller@...6.fr>,
        Julia Lawall <julia.lawall@...ia.fr>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nicolas Palix <nicolas.palix@...g.fr>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH v3 2/3] coccinelle: api: extend memdup_user rule with
 vmemdup_user()

…
> +++ 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 propose 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

* Can it be helpful to omit the SmPL asterisk functionality from
  the operation modes “org” and “report”?

* Should the operation mode “context” work without an extra position metavariable?

Regards,
Markus