linux-kernel - [PATCH 06/10] HID: roccat: kone: constify 'struct bin

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Message-Id: <20241202-sysfs-const-bin_attr-hid-v1-6-16369423a48a@weissschuh.net>
Date: Mon, 02 Dec 2024 20:01:37 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Jiri Kosina <jikos@...nel.org>, Benjamin Tissoires <bentiss@...nel.org>, 
 Stefan Achatz <erazor_de@...rs.sourceforge.net>
Cc: linux-input@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH 06/10] HID: roccat: kone: constify 'struct bin_attribute'

The sysfs core now allows instances of 'struct bin_attribute' to be
moved into read-only memory. Make use of that to protect them against
accidental or malicious modifications.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 drivers/hid/hid-roccat-kone.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/drivers/hid/hid-roccat-kone.c b/drivers/hid/hid-roccat-kone.c
index 3f8f459edcf3c71a655c1d505f94d7e19946bf09..b3c0242e5a37848893e2ab4303f5e6f04a650208 100644
--- a/drivers/hid/hid-roccat-kone.c
+++ b/drivers/hid/hid-roccat-kone.c
@@ -261,7 +261,7 @@ static int kone_get_firmware_version(struct usb_device *usb_dev, int *result)
 }
 
 static ssize_t kone_sysfs_read_settings(struct file *fp, struct kobject *kobj,
-		struct bin_attribute *attr, char *buf,
+		const struct bin_attribute *attr, char *buf,
 		loff_t off, size_t count) {
 	struct device *dev = kobj_to_dev(kobj)->parent->parent;
 	struct kone_device *kone = hid_get_drvdata(dev_get_drvdata(dev));
@@ -285,7 +285,7 @@ static ssize_t kone_sysfs_read_settings(struct file *fp, struct kobject *kobj,
  * case of error the old data is still valid
  */
 static ssize_t kone_sysfs_write_settings(struct file *fp, struct kobject *kobj,
-		struct bin_attribute *attr, char *buf,
+		const struct bin_attribute *attr, char *buf,
 		loff_t off, size_t count) {
 	struct device *dev = kobj_to_dev(kobj)->parent->parent;
 	struct kone_device *kone = hid_get_drvdata(dev_get_drvdata(dev));
@@ -327,11 +327,11 @@ static ssize_t kone_sysfs_write_settings(struct file *fp, struct kobject *kobj,
 
 	return sizeof(struct kone_settings);
 }
-static BIN_ATTR(settings, 0660, kone_sysfs_read_settings,
-		kone_sysfs_write_settings, sizeof(struct kone_settings));
+static const BIN_ATTR(settings, 0660, kone_sysfs_read_settings,
+		      kone_sysfs_write_settings, sizeof(struct kone_settings));
 
 static ssize_t kone_sysfs_read_profilex(struct file *fp,
-		struct kobject *kobj, struct bin_attribute *attr,
+		struct kobject *kobj, const struct bin_attribute *attr,
 		char *buf, loff_t off, size_t count) {
 	struct device *dev = kobj_to_dev(kobj)->parent->parent;
 	struct kone_device *kone = hid_get_drvdata(dev_get_drvdata(dev));
@@ -351,7 +351,7 @@ static ssize_t kone_sysfs_read_profilex(struct file *fp,
 
 /* Writes data only if different to stored data */
 static ssize_t kone_sysfs_write_profilex(struct file *fp,
-		struct kobject *kobj, struct bin_attribute *attr,
+		struct kobject *kobj, const struct bin_attribute *attr,
 		char *buf, loff_t off, size_t count) {
 	struct device *dev = kobj_to_dev(kobj)->parent->parent;
 	struct kone_device *kone = hid_get_drvdata(dev_get_drvdata(dev));
@@ -382,11 +382,11 @@ static ssize_t kone_sysfs_write_profilex(struct file *fp,
 	return sizeof(struct kone_profile);
 }
 #define PROFILE_ATTR(number)					\
-static struct bin_attribute bin_attr_profile##number = {	\
+static const struct bin_attribute bin_attr_profile##number = {	\
 	.attr = { .name = "profile" #number, .mode = 0660 },	\
 	.size = sizeof(struct kone_profile),			\
-	.read = kone_sysfs_read_profilex,			\
-	.write = kone_sysfs_write_profilex,			\
+	.read_new = kone_sysfs_read_profilex,			\
+	.write_new = kone_sysfs_write_profilex,			\
 	.private = &profile_numbers[number-1],			\
 }
 PROFILE_ATTR(1);
@@ -634,7 +634,7 @@ static struct attribute *kone_attrs[] = {
 	NULL,
 };
 
-static struct bin_attribute *kone_bin_attributes[] = {
+static const struct bin_attribute *const kone_bin_attributes[] = {
 	&bin_attr_settings,
 	&bin_attr_profile1,
 	&bin_attr_profile2,
@@ -646,7 +646,7 @@ static struct bin_attribute *kone_bin_attributes[] = {
 
 static const struct attribute_group kone_group = {
 	.attrs = kone_attrs,
-	.bin_attrs = kone_bin_attributes,
+	.bin_attrs_new = kone_bin_attributes,
 };
 
 static const struct attribute_group *kone_groups[] = {

-- 
2.47.1