linux-kernel - [PATCH 09/10] HID: roccat: lua: constify 'struct bin

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Message-Id: <20241202-sysfs-const-bin_attr-hid-v1-9-16369423a48a@weissschuh.net>
Date: Mon, 02 Dec 2024 20:01:40 +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 09/10] HID: roccat: lua: 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-lua.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/hid/hid-roccat-lua.c b/drivers/hid/hid-roccat-lua.c
index d5ddf0d68346b2c147f3c888badb77c06d77f46c..023ec64b4b0ea2f8168839ef6fd2c93c02846eab 100644
--- a/drivers/hid/hid-roccat-lua.c
+++ b/drivers/hid/hid-roccat-lua.c
@@ -66,7 +66,7 @@ static ssize_t lua_sysfs_write(struct file *fp, struct kobject *kobj,
 
 #define LUA_SYSFS_W(thingy, THINGY) \
 static ssize_t lua_sysfs_write_ ## thingy(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) \
 { \
 	return lua_sysfs_write(fp, kobj, buf, off, count, \
@@ -75,7 +75,7 @@ static ssize_t lua_sysfs_write_ ## thingy(struct file *fp, \
 
 #define LUA_SYSFS_R(thingy, THINGY) \
 static ssize_t lua_sysfs_read_ ## thingy(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) \
 { \
 	return lua_sysfs_read(fp, kobj, buf, off, count, \
@@ -85,11 +85,11 @@ static ssize_t lua_sysfs_read_ ## thingy(struct file *fp, \
 #define LUA_BIN_ATTRIBUTE_RW(thingy, THINGY) \
 LUA_SYSFS_W(thingy, THINGY) \
 LUA_SYSFS_R(thingy, THINGY) \
-static struct bin_attribute lua_ ## thingy ## _attr = { \
+static const struct bin_attribute lua_ ## thingy ## _attr = { \
 	.attr = { .name = #thingy, .mode = 0660 }, \
 	.size = LUA_SIZE_ ## THINGY, \
-	.read = lua_sysfs_read_ ## thingy, \
-	.write = lua_sysfs_write_ ## thingy \
+	.read_new = lua_sysfs_read_ ## thingy, \
+	.write_new = lua_sysfs_write_ ## thingy \
 };
 
 LUA_BIN_ATTRIBUTE_RW(control, CONTROL)

-- 
2.47.1