linux-kernel - [PATCH] hwmon: (ibmpowernv) refactor deprecated strncpy

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Message-ID: <20230914-strncpy-drivers-hwmon-ibmpowernv-c-v1-1-ba6b7f42c98c@google.com>
Date:   Thu, 14 Sep 2023 23:21:06 +0000
From:   Justin Stitt <justinstitt@...gle.com>
To:     Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     linux-hwmon@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
        Justin Stitt <justinstitt@...gle.com>
Subject: [PATCH] hwmon: (ibmpowernv) refactor deprecated strncpy

`strncpy` is deprecated for use on NUL-terminated destination strings [1].

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 since `buf` is already zero-initialized.

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>
---
 drivers/hwmon/ibmpowernv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwmon/ibmpowernv.c b/drivers/hwmon/ibmpowernv.c
index 594254d6a72d..57d829dbcda6 100644
--- a/drivers/hwmon/ibmpowernv.c
+++ b/drivers/hwmon/ibmpowernv.c
@@ -234,7 +234,7 @@ static int get_sensor_index_attr(const char *name, u32 *index, char *attr)
 	if (copy_len >= sizeof(buf))
 		return -EINVAL;
 
-	strncpy(buf, hash_pos + 1, copy_len);
+	strscpy(buf, hash_pos + 1, copy_len);
 
 	err = kstrtou32(buf, 10, index);
 	if (err)

---
base-commit: 3669558bdf354cd352be955ef2764cde6a9bf5ec
change-id: 20230914-strncpy-drivers-hwmon-ibmpowernv-c-80a03f16d93a

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