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Date:   Thu, 12 Oct 2023 22:33:34 +0000
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Message-ID: <20231012-strncpy-drivers-net-usb-sr9800-c-v1-1-5540832c8ec2@google.com>
Subject: [PATCH] net: usb: replace deprecated strncpy with strscpy
From:   Justin Stitt <justinstitt@google.com>
To:     "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>
Cc:     linux-usb@vger.kernel.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.

Other implementations of .*get_drvinfo use strscpy so this patch brings
sr_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.

Found with: $ rg "strncpy\("
---
 drivers/net/usb/sr9800.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/usb/sr9800.c b/drivers/net/usb/sr9800.c
index f5e19f3ef6cd..143bd4ab160d 100644
--- a/drivers/net/usb/sr9800.c
+++ b/drivers/net/usb/sr9800.c
@@ -474,8 +474,8 @@ static void sr_get_drvinfo(struct net_device *net,
 {
 	/* Inherit standard device info */
 	usbnet_get_drvinfo(net, info);
-	strncpy(info->driver, DRIVER_NAME, sizeof(info->driver));
-	strncpy(info->version, DRIVER_VERSION, sizeof(info->version));
+	strscpy(info->driver, DRIVER_NAME, sizeof(info->driver));
+	strscpy(info->version, DRIVER_VERSION, sizeof(info->version));
 }
 
 static u32 sr_get_link(struct net_device *net)

---
base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2
change-id: 20231012-strncpy-drivers-net-usb-sr9800-c-38f712c2ff72

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