netdev - Re: [PATCH net-next v1 3/3] net/mlx4_en: Set number of rx/tx channels using ethtool

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Date:	Sat, 01 Dec 2012 11:25:55 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	or.gerlitz@...il.com
Cc:	bhutchings@...arflare.com, amirv@...lanox.com,
	ogerlitz@...lanox.com, oren@...lanox.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v1 3/3] net/mlx4_en: Set number of rx/tx
 channels using ethtool

From: Or Gerlitz <or.gerlitz@...il.com>
Date: Sat, 1 Dec 2012 17:50:09 +0200

> On Sat, Dec 1, 2012 at 1:58 AM, Ben Hutchings <bhutchings@...arflare.com> wrote:
>>
>> The values of max_tx and max_rx are passed in from userland, so you
>> can't trust them.
> 
> Is this a general statement re ethtool values passed from user space
> or something specific here? can't one assume that the ethtool process
> runs under the appropriate admin permission?

He's saying that you need to carefully validate the arguments, not
that appropriate permissions haven't been checked.
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