driver core: Constify core device attributes

To make sure these attributes are not modified by accident or by an
attacker, move them to read-only memory.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://patch.msgid.link/20260512-sysfs-const-attr-device_attr-prep-v3-5-cb7c17b34d52@weissschuh.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 433fbb863fc07e765750fd2ec9fea799d93574aa..4d026682944f218445a232b23d8ccd607bc693fe 100644 (file)
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -495,7 +495,7 @@ void device_pm_move_to_tail(struct device *dev)
 #define to_devlink(dev)        container_of((dev), struct device_link, link_dev)
 
 static ssize_t status_show(struct device *dev,
-                          struct device_attribute *attr, char *buf)
+                          const struct device_attribute *attr, char *buf)
 {
        const char *output;
 
@@ -525,10 +525,10 @@ static ssize_t status_show(struct device *dev,
 
        return sysfs_emit(buf, "%s\n", output);
 }
-static DEVICE_ATTR_RO(status);
+static const DEVICE_ATTR_RO(status);
 
 static ssize_t auto_remove_on_show(struct device *dev,
-                                  struct device_attribute *attr, char *buf)
+                                  const struct device_attribute *attr, char *buf)
 {
        struct device_link *link = to_devlink(dev);
        const char *output;
@@ -542,27 +542,27 @@ static ssize_t auto_remove_on_show(struct device *dev,
 
        return sysfs_emit(buf, "%s\n", output);
 }
-static DEVICE_ATTR_RO(auto_remove_on);
+static const DEVICE_ATTR_RO(auto_remove_on);
 
 static ssize_t runtime_pm_show(struct device *dev,
-                              struct device_attribute *attr, char *buf)
+                              const struct device_attribute *attr, char *buf)
 {
        struct device_link *link = to_devlink(dev);
 
        return sysfs_emit(buf, "%d\n", device_link_test(link, DL_FLAG_PM_RUNTIME));
 }
-static DEVICE_ATTR_RO(runtime_pm);
+static const DEVICE_ATTR_RO(runtime_pm);
 
 static ssize_t sync_state_only_show(struct device *dev,
-                                   struct device_attribute *attr, char *buf)
+                                   const struct device_attribute *attr, char *buf)
 {
        struct device_link *link = to_devlink(dev);
 
        return sysfs_emit(buf, "%d\n", device_link_test(link, DL_FLAG_SYNC_STATE_ONLY));
 }
-static DEVICE_ATTR_RO(sync_state_only);
+static const DEVICE_ATTR_RO(sync_state_only);
 
-static struct attribute *devlink_attrs[] = {
+static const struct attribute *const devlink_attrs[] = {
        &dev_attr_status.attr,
        &dev_attr_auto_remove_on.attr,
        &dev_attr_runtime_pm.attr,
@@ -1306,7 +1306,7 @@ static void device_link_drop_managed(struct device_link *link)
 }
 
 static ssize_t waiting_for_supplier_show(struct device *dev,
-                                        struct device_attribute *attr,
+                                        const struct device_attribute *attr,
                                         char *buf)
 {
        bool val;
@@ -1317,7 +1317,7 @@ static ssize_t waiting_for_supplier_show(struct device *dev,
        device_unlock(dev);
        return sysfs_emit(buf, "%u\n", val);
 }
-static DEVICE_ATTR_RO(waiting_for_supplier);
+static const DEVICE_ATTR_RO(waiting_for_supplier);
 
 /**
  * device_links_force_bind - Prepares device to be force bound
@@ -2792,7 +2792,7 @@ static const struct kset_uevent_ops device_uevent_ops = {
        .uevent =       dev_uevent,
 };
 
-static ssize_t uevent_show(struct device *dev, struct device_attribute *attr,
+static ssize_t uevent_show(struct device *dev, const struct device_attribute *attr,
                           char *buf)
 {
        struct kobject *top_kobj;
@@ -2835,7 +2835,7 @@ out:
        return len;
 }
 
-static ssize_t uevent_store(struct device *dev, struct device_attribute *attr,
+static ssize_t uevent_store(struct device *dev, const struct device_attribute *attr,
                            const char *buf, size_t count)
 {
        int rc;
@@ -2849,9 +2849,9 @@ static ssize_t uevent_store(struct device *dev, struct device_attribute *attr,
 
        return count;
 }
-static DEVICE_ATTR_RW(uevent);
+static const DEVICE_ATTR_RW(uevent);
 
-static ssize_t online_show(struct device *dev, struct device_attribute *attr,
+static ssize_t online_show(struct device *dev, const struct device_attribute *attr,
                           char *buf)
 {
        bool val;
@@ -2862,7 +2862,7 @@ static ssize_t online_show(struct device *dev, struct device_attribute *attr,
        return sysfs_emit(buf, "%u\n", val);
 }
 
-static ssize_t online_store(struct device *dev, struct device_attribute *attr,
+static ssize_t online_store(struct device *dev, const struct device_attribute *attr,
                            const char *buf, size_t count)
 {
        bool val;
@@ -2880,9 +2880,9 @@ static ssize_t online_store(struct device *dev, struct device_attribute *attr,
        unlock_device_hotplug();
        return ret < 0 ? ret : count;
 }
-static DEVICE_ATTR_RW(online);
+static const DEVICE_ATTR_RW(online);
 
-static ssize_t removable_show(struct device *dev, struct device_attribute *attr,
+static ssize_t removable_show(struct device *dev, const struct device_attribute *attr,
                              char *buf)
 {
        const char *loc;
@@ -2899,7 +2899,7 @@ static ssize_t removable_show(struct device *dev, struct device_attribute *attr,
        }
        return sysfs_emit(buf, "%s\n", loc);
 }
-static DEVICE_ATTR_RO(removable);
+static const DEVICE_ATTR_RO(removable);
 
 int device_add_groups(struct device *dev,
                      const struct attribute_group *const *groups)
@@ -3050,12 +3050,12 @@ static void device_remove_attrs(struct device *dev)
                device_remove_groups(dev, class->dev_groups);
 }
 
-static ssize_t dev_show(struct device *dev, struct device_attribute *attr,
+static ssize_t dev_show(struct device *dev, const struct device_attribute *attr,
                        char *buf)
 {
        return print_dev_t(buf, dev->devt);
 }
-static DEVICE_ATTR_RO(dev);
+static const DEVICE_ATTR_RO(dev);
 
 /* /sys/devices/ */
 struct kset *devices_kset;