netdev - [PATCH] liquidio: replace deprecated strncpy/strcpy with strscpy

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Message-ID: <20231005-strncpy-drivers-net-ethernet-cavium-liquidio-lio_ethtool-c-v1-1-ab565ab4d197@google.com>
Date: Thu, 05 Oct 2023 21:33:19 +0000
From: Justin Stitt <justinstitt@...gle.com>
To: Derek Chickles <dchickles@...vell.com>, Satanand Burla <sburla@...vell.com>, 
	Felix Manlunas <fmanlunas@...vell.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] liquidio: replace deprecated strncpy/strcpy 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.

NUL-padding is not required as drvinfo is memset to 0:
|	memset(drvinfo, 0, sizeof(struct ethtool_drvinfo));

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

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/ethernet/cavium/liquidio/lio_ethtool.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/cavium/liquidio/lio_ethtool.c b/drivers/net/ethernet/cavium/liquidio/lio_ethtool.c
index 9d56181a301f..d3e07b6ed5e1 100644
--- a/drivers/net/ethernet/cavium/liquidio/lio_ethtool.c
+++ b/drivers/net/ethernet/cavium/liquidio/lio_ethtool.c
@@ -442,10 +442,11 @@ lio_get_drvinfo(struct net_device *netdev, struct ethtool_drvinfo *drvinfo)
 	oct = lio->oct_dev;
 
 	memset(drvinfo, 0, sizeof(struct ethtool_drvinfo));
-	strcpy(drvinfo->driver, "liquidio");
-	strncpy(drvinfo->fw_version, oct->fw_info.liquidio_firmware_version,
-		ETHTOOL_FWVERS_LEN);
-	strncpy(drvinfo->bus_info, pci_name(oct->pci_dev), 32);
+	strscpy(drvinfo->driver, "liquidio", sizeof(drvinfo->driver));
+	strscpy(drvinfo->fw_version, oct->fw_info.liquidio_firmware_version,
+		sizeof(drvinfo->fw_version));
+	strscpy(drvinfo->bus_info, pci_name(oct->pci_dev),
+		sizeof(drvinfo->bus_info));
 }
 
 static void
@@ -458,10 +459,11 @@ lio_get_vf_drvinfo(struct net_device *netdev, struct ethtool_drvinfo *drvinfo)
 	oct = lio->oct_dev;
 
 	memset(drvinfo, 0, sizeof(struct ethtool_drvinfo));
-	strcpy(drvinfo->driver, "liquidio_vf");
-	strncpy(drvinfo->fw_version, oct->fw_info.liquidio_firmware_version,
-		ETHTOOL_FWVERS_LEN);
-	strncpy(drvinfo->bus_info, pci_name(oct->pci_dev), 32);
+	strscpy(drvinfo->driver, "liquidio_vf", sizeof(drvinfo->driver));
+	strscpy(drvinfo->fw_version, oct->fw_info.liquidio_firmware_version,
+		sizeof(drvinfo->fw_version));
+	strscpy(drvinfo->bus_info, pci_name(oct->pci_dev),
+		sizeof(drvinfo->bus_info));
 }
 
 static int

---
base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2
change-id: 20231005-strncpy-drivers-net-ethernet-cavium-liquidio-lio_ethtool-c-b6932c0f80f1

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