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Message-ID: <20231009-strncpy-drivers-net-dsa-lantiq_gswip-c-v1-1-d55a986a14cc@google.com> Date: Mon, 09 Oct 2023 18:24:20 +0000 From: Justin Stitt <justinstitt@...gle.com> To: Hauke Mehrtens <hauke@...ke-m.de>, 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> Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org, Justin Stitt <justinstitt@...gle.com> Subject: [PATCH] net: dsa: lantiq_gswip: replace deprecated strncpy with ethtool_sprintf `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> --- Note: build-tested only. --- drivers/net/dsa/lantiq_gswip.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/net/dsa/lantiq_gswip.c b/drivers/net/dsa/lantiq_gswip.c index 3c76a1a14aee..d60bc2e37701 100644 --- a/drivers/net/dsa/lantiq_gswip.c +++ b/drivers/net/dsa/lantiq_gswip.c @@ -1759,8 +1759,7 @@ static void gswip_get_strings(struct dsa_switch *ds, int port, u32 stringset, return; for (i = 0; i < ARRAY_SIZE(gswip_rmon_cnt); i++) - strncpy(data + i * ETH_GSTRING_LEN, gswip_rmon_cnt[i].name, - ETH_GSTRING_LEN); + ethtool_sprintf(&data, "%s", gswip_rmon_cnt[i].name); } static u32 gswip_bcm_ram_entry_read(struct gswip_priv *priv, u32 table, --- base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2 change-id: 20231005-strncpy-drivers-net-dsa-lantiq_gswip-c-ece909a364f7 Best regards, -- Justin Stitt <justinstitt@...gle.com>
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