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Commit 7b43a79f authored by Al Viro's avatar Al Viro
Browse files

mnt_flags fixes in do_remount() 



* need vfsmount_lock over modifying it
* need to preserve MNT_SHARED/MNT_UNBINDABLE

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent df1a1ad2

fs/namespace.c

+5 −1
Original line number Diff line number Diff line
@@ -1536,8 +1536,12 @@ static int do_remount(struct path *path, int flags, int mnt_flags, 
		err = change_mount_flags(path->mnt, flags);

	else

		err = do_remount_sb(sb, flags, data, 0);

	if (!err)

	if (!err) {

		spin_lock(&vfsmount_lock);

		mnt_flags |= path->mnt->mnt_flags & MNT_PNODE_MASK;

		path->mnt->mnt_flags = mnt_flags;

		spin_unlock(&vfsmount_lock);

	}

	up_write(&sb->s_umount);

	if (!err) {

		security_sb_post_remount(path->mnt, flags, data);