linux-kernel - Re: [PATCH v2] coccinelle: api: add kzfree script

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Date:   Fri, 5 Jun 2020 08:43:16 +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@...6.fr>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nicolas Palix <nicolas.palix@...g.fr>
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
        Joe Perches <joe@...ches.com>
Subject: Re: [PATCH v2] coccinelle: api: add kzfree script

> Check for memset()/memset_explicit() with 0 followed by
> kfree()/vfree()/kvfree().

Another software evolution will become interesting here.


> +/// memset_explicit with 0 followed by kfree

How do you think about to extend this comment?


Would you like to take the following SmPL code variants into account?


> +virtual context
> +virtual org
> +virtual report
> +virtual patch

+virtual context, org, report, patch


> +(
> +- kfree(E);
> ++ kzfree(E);
> +|
> +- vfree(E);
> ++ kvfree_sensitive(E, size);
> +|
> +- kvfree(E);
> ++ kvfree_sensitive(E, size);
> +)

+(
+-kfree
++kzfree
+      (E);
+|
+-vfree
++kvfree_sensitive
+      (E
++      , size
+      );
+|
+-kvfree
++kvfree_sensitive
+       (E
++       , size
+       );
+)


Regards,
Markus