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

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Message-ID: <alpine.DEB.2.22.394.2006182308110.2367@hadrien>
Date:   Thu, 18 Jun 2020 23:08:42 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...ia.fr>
To:     Kees Cook <keescook@...omium.org>
cc:     cocci@...teme.lip6.fr, linux-kernel@...r.kernel.org
Subject: Re: [Cocci] [PATCH] coccinelle: misc: add array_size_dup script to
 detect missed overlow checks



On Thu, 18 Jun 2020, Kees Cook wrote:

> On Thu, Jun 18, 2020 at 09:56:18PM +0200, Julia Lawall wrote:
> > @@
> > identifier i,fld;
> > expression e;
> > @@
> >
> > \(\(i\|e.fld\|e->fld\) \& E\)
> >
> > The e will match all of the variants you are concerned about.
>
> Ah, I see! Okay, that's good. And the "& E" part is to effectively
> collect it into E (as in, both the left and right of the & must match).

Yes

> So to do the matching from earlier:
>
> @@
> identifier i, fld;
> expression e, ARG1, ARG2;
> @@
>
> array_size(\(\(i\|e.fld\|e->fld\) \& ARG1\), ARG2);

Yes, that would be fine.

julia