linux-hardening - [PATCH] net: netcp: replace deprecated strncpy with strscpy

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Message-ID: <20231012-strncpy-drivers-net-ethernet-ti-netcp_ethss-c-v1-1-93142e620864@google.com>
Date: Thu, 12 Oct 2023 21:05:40 +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>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-hardening@...r.kernel.org, Justin Stitt <justinstitt@...gle.com>
Subject: [PATCH] net: netcp: replace deprecated strncpy with strscpy

strncpy() is deprecated for use on NUL-terminated destination strings
[1] and as such we should prefer more robust and less ambiguous string
interfaces.

Considering the above, a suitable replacement is `strscpy` [2] due to
the fact that it guarantees NUL-termination on the destination buffer
without unnecessarily NUL-padding.

Other implementations of .*get_drvinfo also use strscpy so this patch
brings keystone_get_drvinfo() in line as well:

igb/igb_ethtool.c +851
static void igb_get_drvinfo(struct net_device *netdev,

igbvf/ethtool.c
167:static void igbvf_get_drvinfo(struct net_device *netdev,

i40e/i40e_ethtool.c
1999:static void i40e_get_drvinfo(struct net_device *netdev,

e1000/e1000_ethtool.c
529:static void e1000_get_drvinfo(struct net_device *netdev,

ixgbevf/ethtool.c
211:static void ixgbevf_get_drvinfo(struct net_device *netdev,

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/ti/netcp_ethss.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/ti/netcp_ethss.c b/drivers/net/ethernet/ti/netcp_ethss.c
index 2adf82a32bf6..02cb6474f6dc 100644
--- a/drivers/net/ethernet/ti/netcp_ethss.c
+++ b/drivers/net/ethernet/ti/netcp_ethss.c
@@ -1735,8 +1735,8 @@ static const struct netcp_ethtool_stat xgbe10_et_stats[] = {
 static void keystone_get_drvinfo(struct net_device *ndev,
 				 struct ethtool_drvinfo *info)
 {
-	strncpy(info->driver, NETCP_DRIVER_NAME, sizeof(info->driver));
-	strncpy(info->version, NETCP_DRIVER_VERSION, sizeof(info->version));
+	strscpy(info->driver, NETCP_DRIVER_NAME, sizeof(info->driver));
+	strscpy(info->version, NETCP_DRIVER_VERSION, sizeof(info->version));
 }
 
 static u32 keystone_get_msglevel(struct net_device *ndev)

---
base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2
change-id: 20231012-strncpy-drivers-net-ethernet-ti-netcp_ethss-c-305a53873cfc

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