drbd: fix setsockopt for user mode linux

We use our own copy of kernel_setsockopt, and did not mess around with
get_fs/set_fs, since we thought we knew we would always be KERNEL_DS
anyways. Apparently not so for at least user mode linux, so put the
set_fs(KERNEL_DS) in there.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 3833d56..3080192 100644 (file)
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -1484,46 +1484,53 @@ static inline void drbd_flush_workqueue(struct drbd_conf *mdev)
        conn_flush_workqueue(mdev->tconn);
 }
 
-/* yes, there is kernel_setsockopt, but only since 2.6.18. we don't need to
- * mess with get_fs/set_fs, we know we are KERNEL_DS always. */
+/* Yes, there is kernel_setsockopt, but only since 2.6.18.
+ * So we have our own copy of it here. */
 static inline int drbd_setsockopt(struct socket *sock, int level, int optname,
-                       char __user *optval, int optlen)
+                                 char *optval, int optlen)
 {
+       mm_segment_t oldfs = get_fs();
+       char __user *uoptval;
        int err;
+
+       uoptval = (char __user __force *)optval;
+
+       set_fs(KERNEL_DS);
        if (level == SOL_SOCKET)
-               err = sock_setsockopt(sock, level, optname, optval, optlen);
+               err = sock_setsockopt(sock, level, optname, uoptval, optlen);
        else
-               err = sock->ops->setsockopt(sock, level, optname, optval,
+               err = sock->ops->setsockopt(sock, level, optname, uoptval,
                                            optlen);
+       set_fs(oldfs);
        return err;
 }
 
 static inline void drbd_tcp_cork(struct socket *sock)
 {
-       int __user val = 1;
+       int val = 1;
        (void) drbd_setsockopt(sock, SOL_TCP, TCP_CORK,
-                       (char __user *)&val, sizeof(val));
+                       (char*)&val, sizeof(val));
 }
 
 static inline void drbd_tcp_uncork(struct socket *sock)
 {
-       int __user val = 0;
+       int val = 0;
        (void) drbd_setsockopt(sock, SOL_TCP, TCP_CORK,
-                       (char __user *)&val, sizeof(val));
+                       (char*)&val, sizeof(val));
 }
 
 static inline void drbd_tcp_nodelay(struct socket *sock)
 {
-       int __user val = 1;
+       int val = 1;
        (void) drbd_setsockopt(sock, SOL_TCP, TCP_NODELAY,
-                       (char __user *)&val, sizeof(val));
+                       (char*)&val, sizeof(val));
 }
 
 static inline void drbd_tcp_quickack(struct socket *sock)
 {
-       int __user val = 2;
+       int val = 2;
        (void) drbd_setsockopt(sock, SOL_TCP, TCP_QUICKACK,
-                       (char __user *)&val, sizeof(val));
+                       (char*)&val, sizeof(val));
 }
 
 void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo);