linux-kernel - Re: [PATCH v4] coccinelle: misc: add array_size_dup script to detect missed overflow checks

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Date:   Tue, 23 Jun 2020 09:02:31 +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>,
        Julia Lawall <julia.lawall@...ia.fr>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nicolas Palix <nicolas.palix@...g.fr>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH v4] coccinelle: misc: add array_size_dup script to detect
 missed overflow checks

I don't agree with any of these comments.

julia

On Tue, 23 Jun 2020, Markus Elfring wrote:

> > Changes in v2:
> …
> > - assignment operator used
>
> I prefer the distinction for the application of corresponding metavariables.
>
>
> > Changes in v3:
> …
> >  - \(&E1\|&E2\) changed to &\(E1\|E2\)
>
> Would it be more helpful to mention the movement of the ampersand
> before SmPL disjunctions?
>
>
> …
> >+/// Three types of patterns for these functions:
>
> Will another adjustment be needed according to your information “duplicates warning removed”?
>
>
> …
> > +virtual context
> > +virtual report
> > +virtual org
>
> Can the following SmPL code variant ever become more attractive?
>
> +virtual context, report, org
>
>
> …
> > +expression subE1 <= as.E1;
> > +expression subE2 <= as.E2;
> > +expression as.E1, as.E2, E3;
>
> How do you think about the following SmPL code variant?
>
> +expression subE1 <= as.E1,
> +           subE2 <= as.E2,
> +           as.E1, as.E2, E3;
>
>
> …
> > +msg = "WARNING: array_size is used later (line %s) to compute the same size" % (p2[0].line)
> > +coccilib.report.print_report(p1[0], msg)
>
> Please omit the extra Python variable “msg” for the passing of such simple message objects.
>
> What does hinder you to take the proposed script variants better into account?
>
> Regards,
> Markus
>