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From: Dan Carpenter <dan.carpenter@oracle.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Sasha Levin <sasha.levin@oracle.com>,
	Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Ingo Molnar <mingo@kernel.org>
Subject: Re: [RFC 1/2] compiler: use compiler to detect integer overflows
Date: Thu, 27 Nov 2014 23:42:58 +0300	[thread overview]
Message-ID: <20141127204257.GA11014@mwanda> (raw)
In-Reply-To: <CA+55aFyiCg23eL=y0nE8a-6_tBAtB097J8v_BtpUcHU8sc3hyQ@mail.gmail.com>

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


  reply	other threads:[~2014-11-27 20:43 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-11-26 14:00 [RFC 1/2] compiler: use compiler to detect integer overflows Sasha Levin
2014-11-26 14:00 ` [RFC 2/2] kvm: eventfd: detect integer overflow using check_*_overflow Sasha Levin
2014-11-26 17:50   ` Andrey Ryabinin
2014-11-26 17:55     ` Sasha Levin
2014-11-26 18:23       ` Linus Torvalds
2014-11-26 19:06         ` Sasha Levin
2014-11-26 19:12           ` Linus Torvalds
2014-11-26 19:27             ` Sasha Levin
2014-11-26 17:48 ` [RFC 1/2] compiler: use compiler to detect integer overflows Andrey Ryabinin
     [not found] ` <CA+55aFzyDC=o_Beg+8hjW8+TQXYWCgQo_yfjgHsTz0LRTiomWA@mail.gmail.com>
2014-11-26 18:50   ` Sasha Levin
2014-11-26 18:58     ` Linus Torvalds
2014-11-27 20:42       ` Dan Carpenter [this message]
2014-12-05  9:54         ` Dan Carpenter
2014-12-05 18:50           ` Linus Torvalds
2014-12-05 19:39             ` Dan Carpenter

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