package daemon import ( "strings" "github.com/docker/docker/api/types/mount" "github.com/docker/docker/errdefs" "github.com/pkg/errors" ) // validateBindDaemonRoot ensures that if a given mountpoint's source is within // the daemon root path, that the propagation is setup to prevent a container // from holding private refereneces to a mount within the daemon root, which // can cause issues when the daemon attempts to remove the mountpoint. func (daemon *Daemon) validateBindDaemonRoot(m mount.Mount) (bool, error) { if m.Type != mount.TypeBind { return false, nil } // check if the source is within the daemon root, or if the daemon root is within the source if !strings.HasPrefix(m.Source, daemon.root) && !strings.HasPrefix(daemon.root, m.Source) { return false, nil } if m.BindOptions == nil { return true, nil } switch m.BindOptions.Propagation { case mount.PropagationRSlave, mount.PropagationRShared, "": return m.BindOptions.Propagation == "", nil default: } return false, errdefs.InvalidParameter(errors.Errorf(`invalid mount config: must use either propagation mode "rslave" or "rshared" when mount source is within the daemon root, daemon root: %q, bind mount source: %q, propagation: %q`, daemon.root, m.Source, m.BindOptions.Propagation)) }