linux-hardening - [PATCH] drivers/iio: Remove all strcpy() uses in favor of strscpy()

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Message-Id: <20210801171157.17858-1-len.baker@gmx.com>
Date:   Sun,  1 Aug 2021 19:11:57 +0200
From:   Len Baker <len.baker@....com>
To:     Kees Cook <keescook@...omium.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>
Cc:     Len Baker <len.baker@....com>, linux-hardening@...r.kernel.org,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drivers/iio: Remove all strcpy() uses in favor of strscpy()

strcpy() performs no bounds checking on the destination buffer. This
could result in linear overflows beyond the end of the buffer, leading
to all kinds of misbehaviors. The safe replacement is strscpy().

Signed-off-by: Len Baker <len.baker@....com>
---
This is a task of the KSPP [1]

[1] https://github.com/KSPP/linux/issues/88

 drivers/iio/imu/inv_mpu6050/inv_mpu_magn.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_magn.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_magn.c
index f282e9cc34c5..3a6aa1c4bf6c 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_magn.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_magn.c
@@ -264,6 +264,7 @@ int inv_mpu_magn_set_orient(struct inv_mpu6050_state *st)
 	const char *orient;
 	char *str;
 	int i;
+	size_t n;

 	/* fill magnetometer orientation */
 	switch (st->chip_type) {
@@ -282,17 +283,18 @@ int inv_mpu_magn_set_orient(struct inv_mpu6050_state *st)
 		for (i = 0; i < 3; ++i) {
 			orient = st->orientation.rotation[6 + i];
 			/* use length + 2 for adding minus sign if needed */
-			str = devm_kzalloc(regmap_get_device(st->map),
-					   strlen(orient) + 2, GFP_KERNEL);
+			n = strlen(orient) + 2;
+			str = devm_kzalloc(regmap_get_device(st->map), n,
+					   GFP_KERNEL);
 			if (str == NULL)
 				return -ENOMEM;
 			if (strcmp(orient, "0") == 0) {
-				strcpy(str, orient);
+				strscpy(str, orient, n);
 			} else if (orient[0] == '-') {
-				strcpy(str, &orient[1]);
+				strscpy(str, &orient[1], n);
 			} else {
 				str[0] = '-';
-				strcpy(&str[1], orient);
+				strscpy(&str[1], orient, n - 1);
 			}
 			st->magn_orient.rotation[6 + i] = str;
 		}
--
2.25.1