netdev - Re: [PATCH v2 net-next] ethtool: ignore unused/unreliable fields in set

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Message-ID: <6ca4202e-831f-4d9a-8f32-78dee21ac578@lunn.ch>
Date: Sat, 2 Mar 2024 16:59:25 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Heiner Kallweit <hkallweit1@...il.com>
Cc: Russell King - ARM Linux <linux@...linux.org.uk>,
	Paolo Abeni <pabeni@...hat.com>, Jakub Kicinski <kuba@...nel.org>,
	David Miller <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH v2 net-next] ethtool: ignore unused/unreliable fields in
 set_eee op

On Sat, Mar 02, 2024 at 03:18:27PM +0100, Heiner Kallweit wrote:
> This function is used with the set_eee() ethtool operation. Certain
> fields of struct ethtool_keee() are relevant only for the get_eee()
> operation. In addition, in case of the ioctl interface, we have no
> guarantee that userspace sends sane values in struct ethtool_eee.
> Therefore explicitly ignore all fields not needed for set_eee().
> This protects from drivers trying to use unchecked and unreliable
> data, relying on specific userspace behavior.
> 
> Note: Such unsafe driver behavior has been found and fixed in the
> tg3 driver.
> 
> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew