linux-kernel - Re: [Cocci] [PATCH v3] coccinelle: misc: add array_size_dup script to detect missed overflow checks

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Date:   Mon, 22 Jun 2020 15:16:23 +0300
From:   Denis Efremov <efremov@...ux.com>
To:     Julia Lawall <julia.lawall@...ia.fr>
Cc:     Kees Cook <keescook@...omium.org>, cocci@...teme.lip6.fr,
        linux-kernel@...r.kernel.org
Subject: Re: [Cocci] [PATCH v3] coccinelle: misc: add array_size_dup script to
 detect missed overflow checks

What do you think about removing duplicates warning from the rule?

I mean this kind of warnings: "WARNING: same array_size (line {p1[0].line})"

As for now, I think it's better to not disturb developers with this kind
of things.

Thanks,
Denis

>> +@...dup@
>> +expression subE1 <= as.E1;
>> +expression subE2 <= as.E2;
>> +expression as.E1, as.E2, E3;
>> +assignment operator aop;
>> +position p1, p2;
>> +@@
>> +
>> +* array_size(E1, E2)@p1
>> +  ... when != \(E1\|E2\|subE1\|subE2\) aop E3
>> +      when != &\(E1\|E2\|subE1\|subE2\)
>> +* array_size(E1, E2)@p2
>> +
>> +@...ipt:python depends on report@
>> +p1 << as_dup.p1;
>> +p2 << as_dup.p2;
>> +@@
>> +
>> +coccilib.report.print_report(p2[0],
>> +f"WARNING: same array_size (line {p1[0].line})")
>> +
>> +@...ipt:python depends on org@
>> +p1 << as_dup.p1;
>> +p2 << as_dup.p2;
>> +@@
>> +
>> +coccilib.org.print_todo(p2[0],
>> +f"WARNING: same array_size (line {p1[0].line})")
>> +