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-rw-r--r--pkg/sentry/devices/memdev/BUILD28
-rw-r--r--pkg/sentry/devices/memdev/full.go75
-rw-r--r--pkg/sentry/devices/memdev/memdev.go59
-rw-r--r--pkg/sentry/devices/memdev/null.go76
-rw-r--r--pkg/sentry/devices/memdev/random.go92
-rw-r--r--pkg/sentry/devices/memdev/zero.go88
6 files changed, 0 insertions, 418 deletions
diff --git a/pkg/sentry/devices/memdev/BUILD b/pkg/sentry/devices/memdev/BUILD
deleted file mode 100644
index abe58f818..000000000
--- a/pkg/sentry/devices/memdev/BUILD
+++ /dev/null
@@ -1,28 +0,0 @@
-load("//tools:defs.bzl", "go_library")
-
-licenses(["notice"])
-
-go_library(
- name = "memdev",
- srcs = [
- "full.go",
- "memdev.go",
- "null.go",
- "random.go",
- "zero.go",
- ],
- visibility = ["//pkg/sentry:internal"],
- deps = [
- "//pkg/abi/linux",
- "//pkg/context",
- "//pkg/rand",
- "//pkg/safemem",
- "//pkg/sentry/fsimpl/devtmpfs",
- "//pkg/sentry/memmap",
- "//pkg/sentry/mm",
- "//pkg/sentry/pgalloc",
- "//pkg/sentry/vfs",
- "//pkg/syserror",
- "//pkg/usermem",
- ],
-)
diff --git a/pkg/sentry/devices/memdev/full.go b/pkg/sentry/devices/memdev/full.go
deleted file mode 100644
index c7e197691..000000000
--- a/pkg/sentry/devices/memdev/full.go
+++ /dev/null
@@ -1,75 +0,0 @@
-// Copyright 2020 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 memdev
-
-import (
- "gvisor.dev/gvisor/pkg/context"
- "gvisor.dev/gvisor/pkg/sentry/vfs"
- "gvisor.dev/gvisor/pkg/syserror"
- "gvisor.dev/gvisor/pkg/usermem"
-)
-
-const fullDevMinor = 7
-
-// fullDevice implements vfs.Device for /dev/full.
-type fullDevice struct{}
-
-// Open implements vfs.Device.Open.
-func (fullDevice) Open(ctx context.Context, mnt *vfs.Mount, vfsd *vfs.Dentry, opts vfs.OpenOptions) (*vfs.FileDescription, error) {
- fd := &fullFD{}
- if err := fd.vfsfd.Init(fd, opts.Flags, mnt, vfsd, &vfs.FileDescriptionOptions{
- UseDentryMetadata: true,
- }); err != nil {
- return nil, err
- }
- return &fd.vfsfd, nil
-}
-
-// fullFD implements vfs.FileDescriptionImpl for /dev/full.
-type fullFD struct {
- vfsfd vfs.FileDescription
- vfs.FileDescriptionDefaultImpl
- vfs.DentryMetadataFileDescriptionImpl
-}
-
-// Release implements vfs.FileDescriptionImpl.Release.
-func (fd *fullFD) Release() {
- // noop
-}
-
-// PRead implements vfs.FileDescriptionImpl.PRead.
-func (fd *fullFD) PRead(ctx context.Context, dst usermem.IOSequence, offset int64, opts vfs.ReadOptions) (int64, error) {
- return dst.ZeroOut(ctx, dst.NumBytes())
-}
-
-// Read implements vfs.FileDescriptionImpl.Read.
-func (fd *fullFD) Read(ctx context.Context, dst usermem.IOSequence, opts vfs.ReadOptions) (int64, error) {
- return dst.ZeroOut(ctx, dst.NumBytes())
-}
-
-// PWrite implements vfs.FileDescriptionImpl.PWrite.
-func (fd *fullFD) PWrite(ctx context.Context, src usermem.IOSequence, offset int64, opts vfs.WriteOptions) (int64, error) {
- return 0, syserror.ENOSPC
-}
-
-// Write implements vfs.FileDescriptionImpl.Write.
-func (fd *fullFD) Write(ctx context.Context, src usermem.IOSequence, opts vfs.WriteOptions) (int64, error) {
- return 0, syserror.ENOSPC
-}
-
-// Seek implements vfs.FileDescriptionImpl.Seek.
-func (fd *fullFD) Seek(ctx context.Context, offset int64, whence int32) (int64, error) {
- return 0, nil
-}
diff --git a/pkg/sentry/devices/memdev/memdev.go b/pkg/sentry/devices/memdev/memdev.go
deleted file mode 100644
index 5759900c4..000000000
--- a/pkg/sentry/devices/memdev/memdev.go
+++ /dev/null
@@ -1,59 +0,0 @@
-// Copyright 2020 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 memdev implements "mem" character devices, as implemented in Linux
-// by drivers/char/mem.c and drivers/char/random.c.
-package memdev
-
-import (
- "gvisor.dev/gvisor/pkg/abi/linux"
- "gvisor.dev/gvisor/pkg/context"
- "gvisor.dev/gvisor/pkg/sentry/fsimpl/devtmpfs"
- "gvisor.dev/gvisor/pkg/sentry/vfs"
-)
-
-// Register registers all devices implemented by this package in vfsObj.
-func Register(vfsObj *vfs.VirtualFilesystem) error {
- for minor, dev := range map[uint32]vfs.Device{
- nullDevMinor: nullDevice{},
- zeroDevMinor: zeroDevice{},
- fullDevMinor: fullDevice{},
- randomDevMinor: randomDevice{},
- urandomDevMinor: randomDevice{},
- } {
- if err := vfsObj.RegisterDevice(vfs.CharDevice, linux.MEM_MAJOR, minor, dev, &vfs.RegisterDeviceOptions{
- GroupName: "mem",
- }); err != nil {
- return err
- }
- }
- return nil
-}
-
-// CreateDevtmpfsFiles creates device special files in dev representing all
-// devices implemented by this package.
-func CreateDevtmpfsFiles(ctx context.Context, dev *devtmpfs.Accessor) error {
- for minor, name := range map[uint32]string{
- nullDevMinor: "null",
- zeroDevMinor: "zero",
- fullDevMinor: "full",
- randomDevMinor: "random",
- urandomDevMinor: "urandom",
- } {
- if err := dev.CreateDeviceFile(ctx, name, vfs.CharDevice, linux.MEM_MAJOR, minor, 0666 /* mode */); err != nil {
- return err
- }
- }
- return nil
-}
diff --git a/pkg/sentry/devices/memdev/null.go b/pkg/sentry/devices/memdev/null.go
deleted file mode 100644
index 33d060d02..000000000
--- a/pkg/sentry/devices/memdev/null.go
+++ /dev/null
@@ -1,76 +0,0 @@
-// Copyright 2020 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 memdev
-
-import (
- "io"
-
- "gvisor.dev/gvisor/pkg/context"
- "gvisor.dev/gvisor/pkg/sentry/vfs"
- "gvisor.dev/gvisor/pkg/usermem"
-)
-
-const nullDevMinor = 3
-
-// nullDevice implements vfs.Device for /dev/null.
-type nullDevice struct{}
-
-// Open implements vfs.Device.Open.
-func (nullDevice) Open(ctx context.Context, mnt *vfs.Mount, vfsd *vfs.Dentry, opts vfs.OpenOptions) (*vfs.FileDescription, error) {
- fd := &nullFD{}
- if err := fd.vfsfd.Init(fd, opts.Flags, mnt, vfsd, &vfs.FileDescriptionOptions{
- UseDentryMetadata: true,
- }); err != nil {
- return nil, err
- }
- return &fd.vfsfd, nil
-}
-
-// nullFD implements vfs.FileDescriptionImpl for /dev/null.
-type nullFD struct {
- vfsfd vfs.FileDescription
- vfs.FileDescriptionDefaultImpl
- vfs.DentryMetadataFileDescriptionImpl
-}
-
-// Release implements vfs.FileDescriptionImpl.Release.
-func (fd *nullFD) Release() {
- // noop
-}
-
-// PRead implements vfs.FileDescriptionImpl.PRead.
-func (fd *nullFD) PRead(ctx context.Context, dst usermem.IOSequence, offset int64, opts vfs.ReadOptions) (int64, error) {
- return 0, io.EOF
-}
-
-// Read implements vfs.FileDescriptionImpl.Read.
-func (fd *nullFD) Read(ctx context.Context, dst usermem.IOSequence, opts vfs.ReadOptions) (int64, error) {
- return 0, io.EOF
-}
-
-// PWrite implements vfs.FileDescriptionImpl.PWrite.
-func (fd *nullFD) PWrite(ctx context.Context, src usermem.IOSequence, offset int64, opts vfs.WriteOptions) (int64, error) {
- return src.NumBytes(), nil
-}
-
-// Write implements vfs.FileDescriptionImpl.Write.
-func (fd *nullFD) Write(ctx context.Context, src usermem.IOSequence, opts vfs.WriteOptions) (int64, error) {
- return src.NumBytes(), nil
-}
-
-// Seek implements vfs.FileDescriptionImpl.Seek.
-func (fd *nullFD) Seek(ctx context.Context, offset int64, whence int32) (int64, error) {
- return 0, nil
-}
diff --git a/pkg/sentry/devices/memdev/random.go b/pkg/sentry/devices/memdev/random.go
deleted file mode 100644
index acfa23149..000000000
--- a/pkg/sentry/devices/memdev/random.go
+++ /dev/null
@@ -1,92 +0,0 @@
-// Copyright 2020 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 memdev
-
-import (
- "sync/atomic"
-
- "gvisor.dev/gvisor/pkg/context"
- "gvisor.dev/gvisor/pkg/rand"
- "gvisor.dev/gvisor/pkg/safemem"
- "gvisor.dev/gvisor/pkg/sentry/vfs"
- "gvisor.dev/gvisor/pkg/usermem"
-)
-
-const (
- randomDevMinor = 8
- urandomDevMinor = 9
-)
-
-// randomDevice implements vfs.Device for /dev/random and /dev/urandom.
-type randomDevice struct{}
-
-// Open implements vfs.Device.Open.
-func (randomDevice) Open(ctx context.Context, mnt *vfs.Mount, vfsd *vfs.Dentry, opts vfs.OpenOptions) (*vfs.FileDescription, error) {
- fd := &randomFD{}
- if err := fd.vfsfd.Init(fd, opts.Flags, mnt, vfsd, &vfs.FileDescriptionOptions{
- UseDentryMetadata: true,
- }); err != nil {
- return nil, err
- }
- return &fd.vfsfd, nil
-}
-
-// randomFD implements vfs.FileDescriptionImpl for /dev/random.
-type randomFD struct {
- vfsfd vfs.FileDescription
- vfs.FileDescriptionDefaultImpl
- vfs.DentryMetadataFileDescriptionImpl
-
- // off is the "file offset". off is accessed using atomic memory
- // operations.
- off int64
-}
-
-// Release implements vfs.FileDescriptionImpl.Release.
-func (fd *randomFD) Release() {
- // noop
-}
-
-// PRead implements vfs.FileDescriptionImpl.PRead.
-func (fd *randomFD) PRead(ctx context.Context, dst usermem.IOSequence, offset int64, opts vfs.ReadOptions) (int64, error) {
- return dst.CopyOutFrom(ctx, safemem.FromIOReader{rand.Reader})
-}
-
-// Read implements vfs.FileDescriptionImpl.Read.
-func (fd *randomFD) Read(ctx context.Context, dst usermem.IOSequence, opts vfs.ReadOptions) (int64, error) {
- n, err := dst.CopyOutFrom(ctx, safemem.FromIOReader{rand.Reader})
- atomic.AddInt64(&fd.off, n)
- return n, err
-}
-
-// PWrite implements vfs.FileDescriptionImpl.PWrite.
-func (fd *randomFD) PWrite(ctx context.Context, src usermem.IOSequence, offset int64, opts vfs.WriteOptions) (int64, error) {
- // In Linux, this mixes the written bytes into the entropy pool; we just
- // throw them away.
- return src.NumBytes(), nil
-}
-
-// Write implements vfs.FileDescriptionImpl.Write.
-func (fd *randomFD) Write(ctx context.Context, src usermem.IOSequence, opts vfs.WriteOptions) (int64, error) {
- atomic.AddInt64(&fd.off, src.NumBytes())
- return src.NumBytes(), nil
-}
-
-// Seek implements vfs.FileDescriptionImpl.Seek.
-func (fd *randomFD) Seek(ctx context.Context, offset int64, whence int32) (int64, error) {
- // Linux: drivers/char/random.c:random_fops.llseek == urandom_fops.llseek
- // == noop_llseek
- return atomic.LoadInt64(&fd.off), nil
-}
diff --git a/pkg/sentry/devices/memdev/zero.go b/pkg/sentry/devices/memdev/zero.go
deleted file mode 100644
index 3b1372b9e..000000000
--- a/pkg/sentry/devices/memdev/zero.go
+++ /dev/null
@@ -1,88 +0,0 @@
-// Copyright 2020 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 memdev
-
-import (
- "gvisor.dev/gvisor/pkg/context"
- "gvisor.dev/gvisor/pkg/sentry/memmap"
- "gvisor.dev/gvisor/pkg/sentry/mm"
- "gvisor.dev/gvisor/pkg/sentry/pgalloc"
- "gvisor.dev/gvisor/pkg/sentry/vfs"
- "gvisor.dev/gvisor/pkg/usermem"
-)
-
-const zeroDevMinor = 5
-
-// zeroDevice implements vfs.Device for /dev/zero.
-type zeroDevice struct{}
-
-// Open implements vfs.Device.Open.
-func (zeroDevice) Open(ctx context.Context, mnt *vfs.Mount, vfsd *vfs.Dentry, opts vfs.OpenOptions) (*vfs.FileDescription, error) {
- fd := &zeroFD{}
- if err := fd.vfsfd.Init(fd, opts.Flags, mnt, vfsd, &vfs.FileDescriptionOptions{
- UseDentryMetadata: true,
- }); err != nil {
- return nil, err
- }
- return &fd.vfsfd, nil
-}
-
-// zeroFD implements vfs.FileDescriptionImpl for /dev/zero.
-type zeroFD struct {
- vfsfd vfs.FileDescription
- vfs.FileDescriptionDefaultImpl
- vfs.DentryMetadataFileDescriptionImpl
-}
-
-// Release implements vfs.FileDescriptionImpl.Release.
-func (fd *zeroFD) Release() {
- // noop
-}
-
-// PRead implements vfs.FileDescriptionImpl.PRead.
-func (fd *zeroFD) PRead(ctx context.Context, dst usermem.IOSequence, offset int64, opts vfs.ReadOptions) (int64, error) {
- return dst.ZeroOut(ctx, dst.NumBytes())
-}
-
-// Read implements vfs.FileDescriptionImpl.Read.
-func (fd *zeroFD) Read(ctx context.Context, dst usermem.IOSequence, opts vfs.ReadOptions) (int64, error) {
- return dst.ZeroOut(ctx, dst.NumBytes())
-}
-
-// PWrite implements vfs.FileDescriptionImpl.PWrite.
-func (fd *zeroFD) PWrite(ctx context.Context, src usermem.IOSequence, offset int64, opts vfs.WriteOptions) (int64, error) {
- return src.NumBytes(), nil
-}
-
-// Write implements vfs.FileDescriptionImpl.Write.
-func (fd *zeroFD) Write(ctx context.Context, src usermem.IOSequence, opts vfs.WriteOptions) (int64, error) {
- return src.NumBytes(), nil
-}
-
-// Seek implements vfs.FileDescriptionImpl.Seek.
-func (fd *zeroFD) Seek(ctx context.Context, offset int64, whence int32) (int64, error) {
- return 0, nil
-}
-
-// ConfigureMMap implements vfs.FileDescriptionImpl.ConfigureMMap.
-func (fd *zeroFD) ConfigureMMap(ctx context.Context, opts *memmap.MMapOpts) error {
- m, err := mm.NewSharedAnonMappable(opts.Length, pgalloc.MemoryFileProviderFromContext(ctx))
- if err != nil {
- return err
- }
- opts.MappingIdentity = m
- opts.Mappable = m
- return nil
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 13:30:53 +0000