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

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Date: Wed, 25 Oct 2023 16:41:43 -0700
From: Justin Stitt <justinstitt@...gle.com>
To: Kees Cook <keescook@...omium.org>
Cc: Andrew Lunn <andrew@...n.ch>, 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 7:36 PM Kees Cook <keescook@...omium.org> wrote:
>
> 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.

Thanks for the discussion here.

I've sent a series [1] implementing ethtool_puts() and sending out a
wave of replacements.

[1]: https://lore.kernel.org/all/20231025-ethtool_puts_impl-v1-0-6a53a93d3b72@google.com/
>
> --
> Kees Cook

Thanks
Justin