linux-hardening - Re: [PATCH] net: dsa: realtek: rtl8365mb: replace deprecated strncpy with ethtool

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Date: Tue, 10 Oct 2023 11:05:04 +0000
From: Alvin Šipraga <ALSI@...g-olufsen.dk>
To: Justin Stitt <justinstitt@...gle.com>
CC: Linus Walleij <linus.walleij@...aro.org>, Andrew Lunn <andrew@...n.ch>,
	Florian Fainelli <f.fainelli@...il.com>, Vladimir Oltean <olteanv@...il.com>,
	"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" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-hardening@...r.kernel.org" <linux-hardening@...r.kernel.org>
Subject: Re: [PATCH] net: dsa: realtek: rtl8365mb: replace deprecated strncpy
 with ethtool_sprintf

On Mon, Oct 09, 2023 at 10:43:59PM +0000, Justin Stitt wrote:
> [You don't often get email from justinstitt@...gle.com. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ]
> 
> `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.
> 
> 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: Alvin Šipraga <alsi@...g-olufsen.dk>

> ---
> Note: build-tested only.
> ---
>  drivers/net/dsa/realtek/rtl8365mb.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/net/dsa/realtek/rtl8365mb.c b/drivers/net/dsa/realtek/rtl8365mb.c
> index 41ea3b5a42b1..d171c18dd354 100644
> --- a/drivers/net/dsa/realtek/rtl8365mb.c
> +++ b/drivers/net/dsa/realtek/rtl8365mb.c
> @@ -1303,8 +1303,7 @@ static void rtl8365mb_get_strings(struct dsa_switch *ds, int port, u32 stringset
> 
>         for (i = 0; i < RTL8365MB_MIB_END; i++) {
>                 struct rtl8365mb_mib_counter *mib = &rtl8365mb_mib_counters[i];
> -
> -               strncpy(data + i * ETH_GSTRING_LEN, mib->name, ETH_GSTRING_LEN);
> +               ethtool_sprintf(&data, "%s", mib->name);
>         }
>  }
> 
> 
> ---
> base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2
> change-id: 20231009-strncpy-drivers-net-dsa-realtek-rtl8365mb-c-bb106e4c110c
> 
> Best regards,
> --
> Justin Stitt <justinstitt@...gle.com>
>