Quoting Seth Forshee ([email protected]): > Forbidding a bind mount due to a locked child on a permanently > empty directory provides no security benefit since the > directory cannot contain any contents which have been overmounted > for security reasons. > > Cc: [email protected] # v4.1+ > Signed-off-by: Seth Forshee <[email protected]>
Acked-by: Serge Hallyn <[email protected]> > --- > fs/namespace.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/fs/namespace.c b/fs/namespace.c > index 4fb1691b4355..930f5557b1d1 100644 > --- a/fs/namespace.c > +++ b/fs/namespace.c > @@ -2065,6 +2065,8 @@ static bool has_locked_children(struct mount *mnt, > struct dentry *dentry) > list_for_each_entry(child, &mnt->mnt_mounts, mnt_child) { > if (!is_subdir(child->mnt_mountpoint, dentry)) > continue; > + if (is_empty_dir_inode(child->mnt_mountpoint->d_inode)) > + continue; > > if (child->mnt.mnt_flags & MNT_LOCKED) > return true; > -- > 1.9.1
