nfs: reject changes to resvport and sharecache during remount

Commit c8e47028 made it possible to change resvport/noresvport and
sharecache/nosharecache via a remount operation, neither of which should be
allowed.

Signed-off-by: Scott Mayhew <smayhew@redhat.com>
Fixes: c8e47028 (nfs: Apply NFS_MOUNT_CMP_FLAGMASK to nfs_compare_remount_data)
Cc: stable@vger.kernel.org # 3.16+
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

1 files changed, 5 insertions, 4 deletions

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index c08e837c29e5..e4499d5b51e8 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -2179,7 +2179,7 @@ out_no_address:
         return -EINVAL;
 }
 
-#define NFS_MOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
+#define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
                 | NFS_MOUNT_SECURE \
                 | NFS_MOUNT_TCP \
                 | NFS_MOUNT_VER3 \
@@ -2187,15 +2187,16 @@ out_no_address:
                 | NFS_MOUNT_NONLM \
                 | NFS_MOUNT_BROKEN_SUID \
                 | NFS_MOUNT_STRICTLOCK \
-                | NFS_MOUNT_UNSHARED \
-                | NFS_MOUNT_NORESVPORT \
                 | NFS_MOUNT_LEGACY_INTERFACE)
 
+#define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \
+                ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT))
+
 static int
 nfs_compare_remount_data(struct nfs_server *nfss,
                          struct nfs_parsed_mount_data *data)
 {
-        if ((data->flags ^ nfss->flags) & NFS_MOUNT_CMP_FLAGMASK ||
+        if ((data->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK ||
             data->rsize != nfss->rsize ||
             data->wsize != nfss->wsize ||
             data->version != nfss->nfs_client->rpc_ops->version ||