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Date:   Tue, 10 Oct 2023 19:53:32 +0000
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Message-ID: <20231010-strncpy-drivers-net-ethernet-intel-fm10k-fm10k_ethtool-c-v1-1-dbdc4570c5a6@google.com>
Subject: [PATCH] fm10k: replace deprecated strncpy with strscpy
From:   Justin Stitt <justinstitt@google.com>
To:     Jesse Brandeburg <jesse.brandeburg@intel.com>,
        Tony Nguyen <anthony.l.nguyen@intel.com>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>
Cc:     intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org,
        Justin Stitt <justinstitt@google.com>
Content-Type: text/plain; charset="utf-8"
Precedence: bulk

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

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 fm10k_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@vger.kernel.org
Signed-off-by: Justin Stitt <justinstitt@google.com>
---
Note: build-tested only.
---
 drivers/net/ethernet/intel/fm10k/fm10k_ethtool.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_ethtool.c b/drivers/net/ethernet/intel/fm10k/fm10k_ethtool.c
index d53369e30040..13a05604dcc0 100644
--- a/drivers/net/ethernet/intel/fm10k/fm10k_ethtool.c
+++ b/drivers/net/ethernet/intel/fm10k/fm10k_ethtool.c
@@ -448,10 +448,10 @@ static void fm10k_get_drvinfo(struct net_device *dev,
 {
 	struct fm10k_intfc *interface = netdev_priv(dev);
 
-	strncpy(info->driver, fm10k_driver_name,
-		sizeof(info->driver) - 1);
-	strncpy(info->bus_info, pci_name(interface->pdev),
-		sizeof(info->bus_info) - 1);
+	strscpy(info->driver, fm10k_driver_name,
+		sizeof(info->driver));
+	strscpy(info->bus_info, pci_name(interface->pdev),
+		sizeof(info->bus_info));
 }
 
 static void fm10k_get_pauseparam(struct net_device *dev,

---
base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2
change-id: 20231010-strncpy-drivers-net-ethernet-intel-fm10k-fm10k_ethtool-c-8184ea77861f

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