linux-kernel - [PATCH] net: sparx5: replace deprecated strncpy with ethtool

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Message-ID: <20231011-strncpy-drivers-net-ethernet-microchip-sparx5-sparx5_ethtool-c-v1-1-410953d07f42@google.com>
Date:   Wed, 11 Oct 2023 21:37:18 +0000
From:   Justin Stitt <justinstitt@...gle.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Steen Hegelund <Steen.Hegelund@...rochip.com>,
        Daniel Machon <daniel.machon@...rochip.com>,
        UNGLinuxDriver@...rochip.com
Cc:     netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
        Justin Stitt <justinstitt@...gle.com>
Subject: [PATCH] net: sparx5: 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.

Found with: $ rg "strncpy\("
---
 drivers/net/ethernet/microchip/sparx5/sparx5_ethtool.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_ethtool.c b/drivers/net/ethernet/microchip/sparx5/sparx5_ethtool.c
index 01f3a3a41cdb..37d2584b48a7 100644
--- a/drivers/net/ethernet/microchip/sparx5/sparx5_ethtool.c
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_ethtool.c
@@ -1012,8 +1012,7 @@ static void sparx5_get_sset_strings(struct net_device *ndev, u32 sset, u8 *data)
 		return;
 
 	for (idx = 0; idx < sparx5->num_ethtool_stats; idx++)
-		strncpy(data + idx * ETH_GSTRING_LEN,
-			sparx5->stats_layout[idx], ETH_GSTRING_LEN);
+		ethtool_sprintf(&data, "%s", sparx5->stats_layout[idx]);
 }
 
 static void sparx5_get_sset_data(struct net_device *ndev,

---
base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2
change-id: 20231011-strncpy-drivers-net-ethernet-microchip-sparx5-sparx5_ethtool-c-793896db6cf4

Best regards,
--
Justin Stitt <justinstitt@...gle.com>