linux-hardening - Re: [PATCH] net: phy: tja11xx: replace deprecated strncpy with ethtool

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Message-ID: <202310141935.B326C9E@keescook>
Date: Sat, 14 Oct 2023 19:36:52 -0700
From: Kees Cook <keescook@...omium.org>
To: Andrew Lunn <andrew@...n.ch>
Cc: Justin Stitt <justinstitt@...gle.com>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH] net: phy: tja11xx: replace deprecated strncpy with
 ethtool_sprintf

On Sat, Oct 14, 2023 at 03:55:41AM +0200, Andrew Lunn wrote:
> > I've been told that this whole ethtool API area is considered
> > deprecated. If that holds, then I don't think it's worth adding new
> > helpers to support it when ethtool_sprintf() is sufficient.
> 
> I think deprecated is too strong. The current API is not great, so
> maybe with time a new API will emerge. But given there are around 160
> users of the API, probably over 100 drivers, it will be 20 years or
> more before all that hardware becomes obsolete and the drivers are
> removed.
> 
> > Once you're done with the strncpy->ethtool_sprintf conversions I think
> > it would be nice to have a single patch that fixes all of these
> > "%s"-less instances to use "%s". (Doing per-driver fixes for that case
> > seems just overly painful.)
> 
> I guess it is the same amount of effort to replace them with
> ethtool_puts()?

Yup, right. If adding ethtool_puts() makes sense, then I totally agree.

-- 
Kees Cook