1 files changed, 100 insertions, 0 deletions
diff --git a/pkg/sentry/kernel/uts_namespace.go b/pkg/sentry/kernel/uts_namespace.go
new file mode 100644
index 000000000..58e9b4d1b
--- /dev/null
+++ b/pkg/sentry/kernel/uts_namespace.go
@@ -0,0 +1,100 @@
+// Copyright 2018 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package kernel
+
+import (
+	"sync"
+
+	"gvisor.googlesource.com/gvisor/pkg/sentry/kernel/auth"
+)
+
+// UTSNamespace represents a UTS namespace, a holder of two system identifiers:
+// the hostname and domain name.
+type UTSNamespace struct {
+	// mu protects all fields below.
+	mu         sync.Mutex `state:"nosave"`
+	hostName   string
+	domainName string
+
+	// userns is the user namespace associated with the UTSNamespace.
+	// Privileged operations on this UTSNamespace must have appropriate
+	// capabilities in userns.
+	//
+	// userns is immutable.
+	userns *auth.UserNamespace
+}
+
+// NewUTSNamespace creates a new UTS namespace.
+func NewUTSNamespace(hostName, domainName string, userns *auth.UserNamespace) *UTSNamespace {
+	return &UTSNamespace{
+		hostName:   hostName,
+		domainName: domainName,
+		userns:     userns,
+	}
+}
+
+// UTSNamespace returns the task's UTS namespace.
+func (t *Task) UTSNamespace() *UTSNamespace {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	return t.utsns
+}
+
+// HostName returns the host name of this UTS namespace.
+func (u *UTSNamespace) HostName() string {
+	u.mu.Lock()
+	defer u.mu.Unlock()
+	return u.hostName
+}
+
+// SetHostName sets the host name of this UTS namespace.
+func (u *UTSNamespace) SetHostName(host string) {
+	u.mu.Lock()
+	defer u.mu.Unlock()
+	u.hostName = host
+}
+
+// DomainName returns the domain name of this UTS namespace.
+func (u *UTSNamespace) DomainName() string {
+	u.mu.Lock()
+	defer u.mu.Unlock()
+	return u.domainName
+}
+
+// SetDomainName sets the domain name of this UTS namespace.
+func (u *UTSNamespace) SetDomainName(domain string) {
+	u.mu.Lock()
+	defer u.mu.Unlock()
+	u.domainName = domain
+}
+
+// UserNamespace returns the user namespace associated with this UTS namespace.
+func (u *UTSNamespace) UserNamespace() *auth.UserNamespace {
+	u.mu.Lock()
+	defer u.mu.Unlock()
+	return u.userns
+}
+
+// Clone makes a copy of this UTS namespace, associating the given user
+// namespace.
+func (u *UTSNamespace) Clone(userns *auth.UserNamespace) *UTSNamespace {
+	u.mu.Lock()
+	defer u.mu.Unlock()
+	return &UTSNamespace{
+		hostName:   u.hostName,
+		domainName: u.domainName,
+		userns:     userns,
+	}
+}