96 lines
2.6 KiB
Go
96 lines
2.6 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package linux
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import (
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"gvisor.dev/gvisor/pkg/abi/linux"
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"gvisor.dev/gvisor/pkg/sentry/arch"
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"gvisor.dev/gvisor/pkg/sentry/kernel"
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"gvisor.dev/gvisor/pkg/syserror"
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)
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// Uname implements linux syscall uname.
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func Uname(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
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version := t.SyscallTable().Version
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uts := t.UTSNamespace()
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// Fill in structure fields.
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var u linux.UtsName
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copy(u.Sysname[:], version.Sysname)
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copy(u.Nodename[:], uts.HostName())
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copy(u.Release[:], version.Release)
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copy(u.Version[:], version.Version)
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// build tag above.
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switch t.SyscallTable().Arch {
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case arch.AMD64:
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copy(u.Machine[:], "x86_64")
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case arch.ARM64:
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copy(u.Machine[:], "aarch64")
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default:
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copy(u.Machine[:], "unknown")
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}
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copy(u.Domainname[:], uts.DomainName())
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// Copy out the result.
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va := args[0].Pointer()
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_, err := u.CopyOut(t, va)
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return 0, nil, err
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}
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// Setdomainname implements Linux syscall setdomainname.
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func Setdomainname(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
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nameAddr := args[0].Pointer()
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size := args[1].Int()
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utsns := t.UTSNamespace()
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if !t.HasCapabilityIn(linux.CAP_SYS_ADMIN, utsns.UserNamespace()) {
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return 0, nil, syserror.EPERM
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}
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if size < 0 || size > linux.UTSLen {
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return 0, nil, syserror.EINVAL
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}
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name, err := t.CopyInString(nameAddr, int(size))
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if err != nil {
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return 0, nil, err
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}
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utsns.SetDomainName(name)
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return 0, nil, nil
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}
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// Sethostname implements Linux syscall sethostname.
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func Sethostname(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
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nameAddr := args[0].Pointer()
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size := args[1].Int()
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utsns := t.UTSNamespace()
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if !t.HasCapabilityIn(linux.CAP_SYS_ADMIN, utsns.UserNamespace()) {
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return 0, nil, syserror.EPERM
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}
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if size < 0 || size > linux.UTSLen {
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return 0, nil, syserror.EINVAL
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}
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name := make([]byte, size)
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if _, err := t.CopyInBytes(nameAddr, name); err != nil {
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return 0, nil, err
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}
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utsns.SetHostName(string(name))
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return 0, nil, nil
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}
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