netdev - Re: [PATCH v2 2/2] r8169: Avoid pointer aliasing

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Message-ID: <efc77e73-914b-3b9b-16f2-1ca5353f5210@gmail.com>
Date:   Tue, 5 Feb 2019 12:23:18 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Joe Perches <joe@...ches.com>, David Miller <davem@...emloft.net>,
        thierry.reding@...il.com
Cc:     hkallweit1@...il.com, andrew@...n.ch, nic_swsd@...ltek.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] r8169: Avoid pointer aliasing



On 02/05/2019 12:18 PM, Joe Perches wrote:

> I still think adding __align(<even#>) is unnecessary here unless
> it follows something like a bool or a u8.

This would be some historical side effect, and we do not want to rely on that.

A security feature could in fact ask a compiler to perform random
shuffling of automatic variables.

( a la __randomize_layout )