driver core: handle user namespaces properly with the uid/gid devtmpfs change

Now that devtmpfs is caring about uid/gid, we need to use the correct
internal types so users who have USER_NS enabled will have things work
properly for them.

Thanks to Eric for pointing this out, and the patch review.

Reported-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Kay Sievers <kay@vrfy.org>
Cc: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

5 files changed, 20 insertions, 20 deletions

diff --git a/block/genhd.c b/block/genhd.c
index dfcec431ceea..20625eed5511 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1112,7 +1112,7 @@ struct class block_class = {
 };
 
 static char *block_devnode(struct device *dev, umode_t *mode,
-                           uid_t *uid, gid_t *gid)
+                           kuid_t *uid, kgid_t *gid)
 {
         struct gendisk *disk = dev_to_disk(dev);
 
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 8a428b51089d..f88d9e259a32 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -283,8 +283,8 @@ static int dev_uevent(struct kset *kset, struct kobject *kobj,
                 const char *tmp;
                 const char *name;
                 umode_t mode = 0;
-                uid_t uid = 0;
-                gid_t gid = 0;
+                kuid_t uid = GLOBAL_ROOT_UID;
+                kgid_t gid = GLOBAL_ROOT_GID;
 
                 add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt));
                 add_uevent_var(env, "MINOR=%u", MINOR(dev->devt));
@@ -293,10 +293,10 @@ static int dev_uevent(struct kset *kset, struct kobject *kobj,
                         add_uevent_var(env, "DEVNAME=%s", name);
                         if (mode)
                                 add_uevent_var(env, "DEVMODE=%#o", mode & 0777);
-                        if (uid)
-                                add_uevent_var(env, "DEVUID=%u", uid);
-                        if (gid)
-                                add_uevent_var(env, "DEVGID=%u", gid);
+                        if (!uid_eq(uid, GLOBAL_ROOT_UID))
+                                add_uevent_var(env, "DEVUID=%u", from_kuid(&init_user_ns, uid));
+                        if (!gid_eq(gid, GLOBAL_ROOT_GID))
+                                add_uevent_var(env, "DEVGID=%u", from_kgid(&init_user_ns, gid));
                         kfree(tmp);
                 }
         }
@@ -1297,7 +1297,7 @@ static struct device *next_device(struct klist_iter *i)
  * freed by the caller.
  */
 const char *device_get_devnode(struct device *dev,
-                               umode_t *mode, uid_t *uid, gid_t *gid,
+                               umode_t *mode, kuid_t *uid, kgid_t *gid,
                                const char **tmp)
 {
         char *s;
diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c
index abd4eee61d27..7413d065906b 100644
--- a/drivers/base/devtmpfs.c
+++ b/drivers/base/devtmpfs.c
@@ -42,8 +42,8 @@ static struct req {
         int err;
         const char *name;
         umode_t mode;   /* 0 => delete */
-        uid_t uid;
-        gid_t gid;
+        kuid_t uid;
+        kgid_t gid;
         struct device *dev;
 } *requests;
 
@@ -88,8 +88,8 @@ int devtmpfs_create_node(struct device *dev)
                 return 0;
 
         req.mode = 0;
-        req.uid = 0;
-        req.gid = 0;
+        req.uid = GLOBAL_ROOT_UID;
+        req.gid = GLOBAL_ROOT_GID;
         req.name = device_get_devnode(dev, &req.mode, &req.uid, &req.gid, &tmp);
         if (!req.name)
                 return -ENOMEM;
@@ -192,8 +192,8 @@ static int create_path(const char *nodepath)
         return err;
 }
 
-static int handle_create(const char *nodename, umode_t mode, uid_t uid,
-                         gid_t gid, struct device *dev)
+static int handle_create(const char *nodename, umode_t mode, kuid_t uid,
+                         kgid_t gid, struct device *dev)
 {
         struct dentry *dentry;
         struct path path;
@@ -212,8 +212,8 @@ static int handle_create(const char *nodename, umode_t mode, uid_t uid,
                 struct iattr newattrs;
 
                 newattrs.ia_mode = mode;
-                newattrs.ia_uid = KUIDT_INIT(uid);
-                newattrs.ia_gid = KGIDT_INIT(gid);
+                newattrs.ia_uid = uid;
+                newattrs.ia_gid = gid;
                 newattrs.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID;
                 mutex_lock(&dentry->d_inode->i_mutex);
                 notify_change(dentry, &newattrs);
@@ -364,7 +364,7 @@ int devtmpfs_mount(const char *mntdir)
 
 static DECLARE_COMPLETION(setup_done);
 
-static int handle(const char *name, umode_t mode, uid_t uid, gid_t gid,
+static int handle(const char *name, umode_t mode, kuid_t uid, kgid_t gid,
                   struct device *dev)
 {
         if (mode)
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 17002832abd9..e092b414dc50 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -318,7 +318,7 @@ static const struct dev_pm_ops usb_device_pm_ops = {
 
 
 static char *usb_devnode(struct device *dev,
-                         umode_t *mode, uid_t *uid, gid_t *gid)
+                         umode_t *mode, kuid_t *uid, kgid_t *gid)
 {
         struct usb_device *usb_dev;
 
diff --git a/include/linux/device.h b/include/linux/device.h
index 851b85c7101e..88615ccaf23a 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -467,7 +467,7 @@ struct device_type {
         const struct attribute_group **groups;
         int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
         char *(*devnode)(struct device *dev, umode_t *mode,
-                         uid_t *uid, gid_t *gid);
+                         kuid_t *uid, kgid_t *gid);
         void (*release)(struct device *dev);
 
         const struct dev_pm_ops *pm;
@@ -845,7 +845,7 @@ extern int device_rename(struct device *dev, const char *new_name);
 extern int device_move(struct device *dev, struct device *new_parent,
                        enum dpm_order dpm_order);
 extern const char *device_get_devnode(struct device *dev,
-                                      umode_t *mode, uid_t *uid, gid_t *gid,
+                                      umode_t *mode, kuid_t *uid, kgid_t *gid,
                                       const char **tmp);
 extern void *dev_get_drvdata(const struct device *dev);
 extern int dev_set_drvdata(struct device *dev, void *data);