diff options
Diffstat (limited to 'pkg/sentry/devices/memdev')
| -rw-r--r-- | pkg/sentry/devices/memdev/BUILD | 28 | ||||
| -rw-r--r-- | pkg/sentry/devices/memdev/full.go | 75 | ||||
| -rw-r--r-- | pkg/sentry/devices/memdev/memdev.go | 59 | ||||
| -rw-r--r-- | pkg/sentry/devices/memdev/null.go | 76 | ||||
| -rw-r--r-- | pkg/sentry/devices/memdev/random.go | 92 | ||||
| -rw-r--r-- | pkg/sentry/devices/memdev/zero.go | 88 |
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 -} |