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]> --- 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
