linux-kernel - Re: [RFC 1/2] compiler: use compiler to detect integer overflows

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Message-ID: <20141127204257.GA11014@mwanda>
Date:	Thu, 27 Nov 2014 23:42:58 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Sasha Levin <sasha.levin@...cle.com>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [RFC 1/2] compiler: use compiler to detect integer overflows

On Wed, Nov 26, 2014 at 10:58:43AM -0800, Linus Torvalds wrote:
> I don't think coccinelle can do signedness checks, though, especially
> of the kind that are hidden deep behind some typedef like "loff_t".
> Maybe I'm wrong. Maybe smatch can? Adding Dan Carpenter to the cc..
> 

Smatch knows about datatypes and signedness.

I've written a bunch of integer overflow checks and found some bugs but
the tests have always had too many false positives to publish.  I'll
take a closer look at this next week.

regards,
dan carpenter

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