netdev - Re: net: integer overflow in ip_idents

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Message-Id: <1418771356.3449499.203748285.4B1A82B8@webmail.messagingengine.com>
Date:	Wed, 17 Dec 2014 00:09:16 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Eric Dumazet <eric.dumazet@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	LKML <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
	Andrey Ryabinin <a.ryabinin@...sung.com>,
	Dave Jones <davej@...hat.com>
Subject: Re: net: integer overflow in ip_idents_reserve



On Tue, Dec 16, 2014, at 22:47, Eric Dumazet wrote:
> On Tue, 2014-12-16 at 16:19 -0500, Sasha Levin wrote:
> > Hi Eric,
> > 
> > While fuzzing with trinity on a -next kernel with the undefined behaviour
> > sanitizer path, I've observed the following warning in code which was
> > introduced in 04ca6973f7 ("ip: make IP identifiers less predictable"):
> 
> This is a false positive.

Also we compile the whole kernel with -fno-strict-overflow, so every
report of signed overflow leading to undefined behavior is probably a
false positive. I don't know if it is worth to try to get rid of them, I
doubt it.

Bye,
Hannes
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