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// 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.
package linux
import (
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/errors/linuxerr"
"gvisor.dev/gvisor/pkg/sentry/arch"
"gvisor.dev/gvisor/pkg/sentry/kernel"
)
// Uname implements linux syscall uname.
func Uname(t *kernel.Task, sysno uintptr, 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)
// build tag above.
switch t.SyscallTable().Arch {
case arch.AMD64:
copy(u.Machine[:], "x86_64")
case arch.ARM64:
copy(u.Machine[:], "aarch64")
default:
copy(u.Machine[:], "unknown")
}
copy(u.Domainname[:], uts.DomainName())
// Copy out the result.
va := args[0].Pointer()
_, err := u.CopyOut(t, va)
return 0, nil, err
}
// Setdomainname implements Linux syscall setdomainname.
func Setdomainname(t *kernel.Task, sysno uintptr, 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, linuxerr.EPERM
}
if size < 0 || size > linux.UTSLen {
return 0, nil, linuxerr.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, sysno uintptr, 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, linuxerr.EPERM
}
if size < 0 || size > linux.UTSLen {
return 0, nil, linuxerr.EINVAL
}
name := make([]byte, size)
if _, err := t.CopyInBytes(nameAddr, name); err != nil {
return 0, nil, err
}
utsns.SetHostName(string(name))
return 0, nil, nil
}
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