Merge tag 'nfsd-4.7-3' of git://linux-nfs.org/~bfields/linux

[cascardo/linux.git] / fs / namespace.c

diff --git a/fs/namespace.c b/fs/namespace.c
index a7ec92c..783004a 100644 (file)
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -3247,6 +3247,10 @@ static bool fs_fully_visible(struct file_system_type *type, int *new_mnt_flags)
                if (mnt->mnt.mnt_sb->s_iflags & SB_I_NOEXEC)
                        mnt_flags &= ~(MNT_LOCK_NOSUID | MNT_LOCK_NOEXEC);
 
+               /* Don't miss readonly hidden in the superblock flags */
+               if (mnt->mnt.mnt_sb->s_flags & MS_RDONLY)
+                       mnt_flags |= MNT_LOCK_READONLY;
+
                /* Verify the mount flags are equal to or more permissive
                 * than the proposed new mount.
                 */