Add support for ipc namespace modes "none, private, sharable"

Fixes: #13265

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

3 files changed, 16 insertions, 4 deletions

diff --git a/pkg/specgen/generate/container.go b/pkg/specgen/generate/container.go
index b38b0e695..f7ea2edfa 100644
--- a/pkg/specgen/generate/container.go
+++ b/pkg/specgen/generate/container.go
@@ -428,9 +428,12 @@ func ConfigToSpec(rt *libpod.Runtime, specg *specgen.SpecGenerator, contaierID s
 			case "cgroup":
 				specg.CgroupNS = specgen.Namespace{NSMode: specgen.Default} //default
 			case "ipc":
-				if conf.ShmDir == "/dev/shm" {
+				switch conf.ShmDir {
+				case "/dev/shm":
 					specg.IpcNS = specgen.Namespace{NSMode: specgen.Host}
-				} else {
+				case "":
+					specg.IpcNS = specgen.Namespace{NSMode: specgen.None}
+				default:
 					specg.IpcNS = specgen.Namespace{NSMode: specgen.Default} //default
 				}
 			case "uts":
diff --git a/pkg/specgen/generate/namespaces.go b/pkg/specgen/generate/namespaces.go
index 9ce45aaf0..05c2d1741 100644
--- a/pkg/specgen/generate/namespaces.go
+++ b/pkg/specgen/generate/namespaces.go
@@ -134,8 +134,17 @@ func namespaceOptions(ctx context.Context, s *specgen.SpecGenerator, rt *libpod.
 		if err != nil {
 			return nil, errors.Wrapf(err, "error looking up container to share ipc namespace with")
 		}
+		if ipcCtr.ConfigNoCopy().NoShmShare {
+			return nil, errors.Errorf("joining IPC of container %s is not allowed: non-shareable IPC (hint: use IpcMode:shareable for the donor container)", ipcCtr.ID())
+		}
 		toReturn = append(toReturn, libpod.WithIPCNSFrom(ipcCtr))
-		toReturn = append(toReturn, libpod.WithShmDir(ipcCtr.ShmDir()))
+		if !ipcCtr.ConfigNoCopy().NoShm {
+			toReturn = append(toReturn, libpod.WithShmDir(ipcCtr.ShmDir()))
+		}
+	case specgen.None:
+		toReturn = append(toReturn, libpod.WithNoShm(true))
+	case specgen.Private:
+		toReturn = append(toReturn, libpod.WithNoShmShare(true))
 	}
 
 	// UTS
diff --git a/pkg/specgen/generate/security.go b/pkg/specgen/generate/security.go
index 988c29832..ec52164ab 100644
--- a/pkg/specgen/generate/security.go
+++ b/pkg/specgen/generate/security.go
@@ -222,7 +222,7 @@ func securityConfigureGenerator(s *specgen.SpecGenerator, g *generate.Generator,
 	for sysctlKey, sysctlVal := range defaultSysctls {
 		// Ignore mqueue sysctls if --ipc=host
 		if noUseIPC && strings.HasPrefix(sysctlKey, "fs.mqueue.") {
-			logrus.Infof("Sysctl %s=%s ignored in containers.conf, since IPC Namespace set to host", sysctlKey, sysctlVal)
+			logrus.Infof("Sysctl %s=%s ignored in containers.conf, since IPC Namespace set to %q", sysctlKey, sysctlVal, s.IpcNS.NSMode)
 
 			continue
 		}