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

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Date: Mon, 9 Oct 2023 16:12:01 -0700
From: Florian Fainelli <f.fainelli@...il.com>
To: Justin Stitt <justinstitt@...gle.com>, Wei Fang <wei.fang@....com>,
 Shenwei Wang <shenwei.wang@....com>, Clark Wang <xiaoning.wang@....com>,
 NXP Linux Team <linux-imx@....com>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Alexei Starovoitov <ast@...nel.org>,
 Daniel Borkmann <daniel@...earbox.net>,
 Jesper Dangaard Brouer <hawk@...nel.org>,
 John Fastabend <john.fastabend@...il.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 bpf@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] net: fec: replace deprecated strncpy with ethtool_sprintf

On 10/9/23 16:05, Justin Stitt wrote:
> `strncpy` is deprecated for use on NUL-terminated destination strings
> [1] and as such we should prefer more robust and less ambiguous string
> interfaces.
> 
> ethtool_sprintf() is designed specifically for get_strings() usage.
> Let's replace strncpy in favor of this more robust and easier to
> understand interface.
> 
> Also, while we're here, let's change memcpy() over to ethtool_sprintf()
> for consistency.
> 
> Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
> Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2]
> Link: https://github.com/KSPP/linux/issues/90
> Cc: linux-hardening@...r.kernel.org
> Signed-off-by: Justin Stitt <justinstitt@...gle.com>

Reviewed-by: Florian Fainelli <florian.fainelli@...adcom.com>
-- 
Florian