netdev - Re: net: integer overflow in ip_idents

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Message-ID: <1418772147.9773.67.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 16 Dec 2014 15:22:27 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	Sasha Levin <sasha.levin@...cle.com>,
	"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 Wed, 2014-12-17 at 00:09 +0100, Hannes Frederic Sowa wrote:


> 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.

Presumably we could have uatomic_t , or atomic_u32_t, whatever...

This particular xadd() is heavily hit in some cases, we really do not
want a cmpxchg()



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