1 files changed, 89 insertions, 0 deletions
diff --git a/pkg/sentry/syscalls/linux/sys_utsname.go b/pkg/sentry/syscalls/linux/sys_utsname.go
new file mode 100644
index 000000000..fa81fe10e
--- /dev/null
+++ b/pkg/sentry/syscalls/linux/sys_utsname.go
@@ -0,0 +1,89 @@
+// Copyright 2018 The gVisor Authors.
+//
+// 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.
+
+// +build amd64
+
+package linux
+
+import (
+	"gvisor.googlesource.com/gvisor/pkg/abi/linux"
+	"gvisor.googlesource.com/gvisor/pkg/sentry/arch"
+	"gvisor.googlesource.com/gvisor/pkg/sentry/kernel"
+	"gvisor.googlesource.com/gvisor/pkg/syserror"
+)
+
+// Uname implements linux syscall uname.
+func Uname(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
+	version := t.SyscallTable().Version
+
+	uts := t.UTSNamespace()
+
+	// Fill in structure fields.
+	var u linux.UtsName
+	copy(u.Sysname[:], version.Sysname)
+	copy(u.Nodename[:], uts.HostName())
+	copy(u.Release[:], version.Release)
+	copy(u.Version[:], version.Version)
+	copy(u.Machine[:], "x86_64") // build tag above.
+	copy(u.Domainname[:], uts.DomainName())
+
+	// Copy out the result.
+	va := args[0].Pointer()
+	_, err := t.CopyOut(va, u)
+	return 0, nil, err
+}
+
+// Setdomainname implements Linux syscall setdomainname.
+func Setdomainname(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
+	nameAddr := args[0].Pointer()
+	size := args[1].Int()
+
+	utsns := t.UTSNamespace()
+	if !t.HasCapabilityIn(linux.CAP_SYS_ADMIN, utsns.UserNamespace()) {
+		return 0, nil, syserror.EPERM
+	}
+	if size < 0 || size > linux.UTSLen {
+		return 0, nil, syserror.EINVAL
+	}
+
+	name, err := t.CopyInString(nameAddr, int(size))
+	if err != nil {
+		return 0, nil, err
+	}
+
+	utsns.SetDomainName(name)
+	return 0, nil, nil
+}
+
+// Sethostname implements Linux syscall sethostname.
+func Sethostname(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
+	nameAddr := args[0].Pointer()
+	size := args[1].Int()
+
+	utsns := t.UTSNamespace()
+	if !t.HasCapabilityIn(linux.CAP_SYS_ADMIN, utsns.UserNamespace()) {
+		return 0, nil, syserror.EPERM
+	}
+	if size < 0 || size > linux.UTSLen {
+		return 0, nil, syserror.EINVAL
+	}
+
+	name, err := t.CopyInString(nameAddr, int(size))
+	if err != nil {
+		return 0, nil, err
+	}
+
+	utsns.SetHostName(name)
+	return 0, nil, nil
+}