fuse: 32-bit user space ioctl compat for fuse device

With a 64-bit kernel build the FUSE device cannot handle ioctl requests
coming from 32-bit user space.  This is due to the ioctl command
translation that generates different command identifiers that thus cannot
be used for direct comparisons without proper manipulation.

Explicitly extract type and number from the ioctl command to enable 32-bit
user space compatibility on 64-bit kernel builds.

Signed-off-by: Alessio Balsini <balsini@android.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index c6636b4..c0fee83 100644 (file)
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -2229,19 +2229,21 @@ static int fuse_device_clone(struct fuse_conn *fc, struct file *new)
 static long fuse_dev_ioctl(struct file *file, unsigned int cmd,
                           unsigned long arg)
 {
-       int err = -ENOTTY;
+       int res;
+       int oldfd;
+       struct fuse_dev *fud = NULL;
 
-       if (cmd == FUSE_DEV_IOC_CLONE) {
-               int oldfd;
+       if (_IOC_TYPE(cmd) != FUSE_DEV_IOC_MAGIC)
+               return -ENOTTY;
 
-               err = -EFAULT;
-               if (!get_user(oldfd, (__u32 __user *) arg)) {
+       switch (_IOC_NR(cmd)) {
+       case _IOC_NR(FUSE_DEV_IOC_CLONE):
+               res = -EFAULT;
+               if (!get_user(oldfd, (__u32 __user *)arg)) {
                        struct file *old = fget(oldfd);
 
-                       err = -EINVAL;
+                       res = -EINVAL;
                        if (old) {
-                               struct fuse_dev *fud = NULL;
-
                                /*
                                 * Check against file->f_op because CUSE
                                 * uses the same ioctl handler.
@@ -2252,14 +2254,18 @@ static long fuse_dev_ioctl(struct file *file, unsigned int cmd,
 
                                if (fud) {
                                        mutex_lock(&fuse_mutex);
-                                       err = fuse_device_clone(fud->fc, file);
+                                       res = fuse_device_clone(fud->fc, file);
                                        mutex_unlock(&fuse_mutex);
                                }
                                fput(old);
                        }
                }
+               break;
+       default:
+               res = -ENOTTY;
+               break;
        }
-       return err;
+       return res;
 }
 
 const struct file_operations fuse_dev_operations = {

diff --git a/include/uapi/linux/fuse.h b/include/uapi/linux/fuse.h
index 98ca64d..5444261 100644 (file)
--- a/include/uapi/linux/fuse.h
+++ b/include/uapi/linux/fuse.h
@@ -903,7 +903,8 @@ struct fuse_notify_retrieve_in {
 };
 
 /* Device ioctls: */
-#define FUSE_DEV_IOC_CLONE     _IOR(229, 0, uint32_t)
+#define FUSE_DEV_IOC_MAGIC             229
+#define FUSE_DEV_IOC_CLONE             _IOR(FUSE_DEV_IOC_MAGIC, 0, uint32_t)
 
 struct fuse_lseek_in {
        uint64_t        fh;