linux-kernel - Re: [PATCH v3 12/16] treewide: Use array

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Date:   Sun, 1 Jul 2018 11:22:36 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     Julia Lawall <julia.lawall@...6.fr>,
        Kees Cook <keescook@...omium.org>, linux-mm@...ck.org,
        kernel-hardening@...ts.openwall.com
Cc:     kernel-janitors@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v3 12/16] treewide: Use array_size() for kmalloc()-family

>> * The repetition of such a constraint in subsequent SmPL rules could be avoided
>>   if inheritance will be used for this metavariable.
> 
> This is quite incorrect.

I suggest to consider additional software design options.


> Inheritance is only possible when a match of the previous rule has succeeded.

I agree with this information.


> If a rule never applies in a given file, the rules that inherit from it
> won't apply either.

I would like to point the possibility out to specify a source code search
which will find interesting function calls at least by an inital SmPL rule.


> Furthermore, what is inherited is the value, not the constraint.

This technical detail can be fine.


> If the original binding of alloc only ever matches kmalloc,
> then the inherited references will only match kmalloc too.

Can the desired search pattern be extended in significant ways?

Regards,
Markus