linux-hardening - [PATCH net-next 05/37] can: peak_pci: replace deprecated strncpy with strscpy

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Message-Id: <20231005195812.549776-6-mkl@pengutronix.de>
Date: Thu,  5 Oct 2023 21:57:40 +0200
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
	kuba@...nel.org,
	linux-can@...r.kernel.org,
	kernel@...gutronix.de,
	Justin Stitt <justinstitt@...gle.com>,
	linux-hardening@...r.kernel.org,
	Kees Cook <keescook@...omium.org>,
	Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH net-next 05/37] can: peak_pci: replace deprecated strncpy with strscpy

From: Justin Stitt <justinstitt@...gle.com>

`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 since card is already zero-initialized:
|       card = kzalloc(sizeof(*card), GFP_KERNEL);

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>
Reviewed-by: Kees Cook <keescook@...omium.org>
Link: https://lore.kernel.org/all/20231005-strncpy-drivers-net-can-sja1000-peak_pci-c-v1-1-c36e1702cd56@google.com
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/sja1000/peak_pci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/can/sja1000/peak_pci.c b/drivers/net/can/sja1000/peak_pci.c
index 84f34020aafb..da396d641e24 100644
--- a/drivers/net/can/sja1000/peak_pci.c
+++ b/drivers/net/can/sja1000/peak_pci.c
@@ -462,7 +462,7 @@ static int peak_pciec_probe(struct pci_dev *pdev, struct net_device *dev)
 		card->led_chip.owner = THIS_MODULE;
 		card->led_chip.dev.parent = &pdev->dev;
 		card->led_chip.algo_data = &card->i2c_bit;
-		strncpy(card->led_chip.name, "peak_i2c",
+		strscpy(card->led_chip.name, "peak_i2c",
 			sizeof(card->led_chip.name));
 
 		card->i2c_bit = peak_pciec_i2c_bit_ops;
-- 
2.40.1