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-rw-r--r--libpod/oci_linux.go53
1 files changed, 53 insertions, 0 deletions
diff --git a/libpod/oci_linux.go b/libpod/oci_linux.go
index 8c0abad80..01f7c3649 100644
--- a/libpod/oci_linux.go
+++ b/libpod/oci_linux.go
@@ -3,15 +3,20 @@
package libpod
import (
+ "fmt"
"os"
"os/exec"
"path/filepath"
+ "runtime"
"strings"
"syscall"
"github.com/containerd/cgroups"
+ "github.com/containers/libpod/pkg/rootless"
"github.com/containers/libpod/utils"
+ pmount "github.com/containers/storage/pkg/mount"
spec "github.com/opencontainers/runtime-spec/specs-go"
+ "github.com/pkg/errors"
"github.com/sirupsen/logrus"
"golang.org/x/sys/unix"
)
@@ -91,6 +96,54 @@ func (r *OCIRuntime) createContainer(ctr *Container, cgroupParent string, restor
return err
}
}
+
+ // if we are running a non privileged container, be sure to umount some kernel paths so they are not
+ // bind mounted inside the container at all.
+ if !ctr.config.Privileged && !rootless.IsRootless() {
+ ch := make(chan error)
+ go func() {
+ runtime.LockOSThread()
+ err := func() error {
+ fd, err := os.Open(fmt.Sprintf("/proc/%d/task/%d/ns/mnt", os.Getpid(), unix.Gettid()))
+ if err != nil {
+ return err
+ }
+ defer fd.Close()
+
+ // create a new mountns on the current thread
+ if err = unix.Unshare(unix.CLONE_NEWNS); err != nil {
+ return err
+ }
+ defer unix.Setns(int(fd.Fd()), unix.CLONE_NEWNS)
+
+ // don't spread our mounts around. We are setting only /sys to be slave
+ // so that the cleanup process is still able to umount the storage and the
+ // changes are propagated to the host.
+ err = unix.Mount("/sys", "/sys", "none", unix.MS_REC|unix.MS_SLAVE, "")
+ if err != nil {
+ return errors.Wrapf(err, "cannot make /sys slave")
+ }
+
+ mounts, err := pmount.GetMounts()
+ if err != nil {
+ return err
+ }
+ for _, m := range mounts {
+ if !strings.HasPrefix(m.Mountpoint, "/sys/kernel") {
+ continue
+ }
+ err = unix.Unmount(m.Mountpoint, 0)
+ if err != nil {
+ return errors.Wrapf(err, "cannot unmount %s", m.Mountpoint)
+ }
+ }
+ return r.createOCIContainer(ctr, cgroupParent, restoreOptions)
+ }()
+ ch <- err
+ }()
+ err := <-ch
+ return err
+ }
}
return r.createOCIContainer(ctr, cgroupParent, restoreOptions)
}