1 files changed, 0 insertions, 308 deletions
diff --git a/pkg/sentry/fs/ashmem/area.go b/pkg/sentry/fs/ashmem/area.go
deleted file mode 100644
index 3b8d6ca89..000000000
--- a/pkg/sentry/fs/ashmem/area.go
+++ /dev/null
@@ -1,308 +0,0 @@
-// 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 ashmem
-
-import (
-	"sync"
-
-	"gvisor.dev/gvisor/pkg/abi/linux"
-	"gvisor.dev/gvisor/pkg/sentry/arch"
-	"gvisor.dev/gvisor/pkg/sentry/context"
-	"gvisor.dev/gvisor/pkg/sentry/fs"
-	"gvisor.dev/gvisor/pkg/sentry/fs/fsutil"
-	"gvisor.dev/gvisor/pkg/sentry/fs/tmpfs"
-	"gvisor.dev/gvisor/pkg/sentry/memmap"
-	"gvisor.dev/gvisor/pkg/sentry/usage"
-	"gvisor.dev/gvisor/pkg/sentry/usermem"
-	"gvisor.dev/gvisor/pkg/syserror"
-	"gvisor.dev/gvisor/pkg/waiter"
-)
-
-const (
-	// namePrefix is the name prefix assumed and forced by the Linux implementation.
-	namePrefix = "dev/ashmem"
-
-	// nameLen is the maximum name length.
-	nameLen = 256
-)
-
-// Area implements fs.FileOperations.
-//
-// +stateify savable
-type Area struct {
-	fsutil.FileNoFsync              `state:"nosave"`
-	fsutil.FileNoSplice             `state:"nosave"`
-	fsutil.FileNoopFlush            `state:"nosave"`
-	fsutil.FileNotDirReaddir        `state:"nosave"`
-	fsutil.FileUseInodeUnstableAttr `state:"nosave"`
-	waiter.AlwaysReady              `state:"nosave"`
-
-	ad *Device
-
-	// mu protects fields below.
-	mu        sync.Mutex `state:"nosave"`
-	tmpfsFile *fs.File
-	name      string
-	size      uint64
-	perms     usermem.AccessType
-	pb        *PinBoard
-}
-
-// Release implements fs.FileOperations.Release.
-func (a *Area) Release() {
-	a.mu.Lock()
-	defer a.mu.Unlock()
-	if a.tmpfsFile != nil {
-		a.tmpfsFile.DecRef()
-		a.tmpfsFile = nil
-	}
-}
-
-// Seek implements fs.FileOperations.Seek.
-func (a *Area) Seek(ctx context.Context, file *fs.File, whence fs.SeekWhence, offset int64) (int64, error) {
-	a.mu.Lock()
-	defer a.mu.Unlock()
-	if a.size == 0 {
-		return 0, syserror.EINVAL
-	}
-	if a.tmpfsFile == nil {
-		return 0, syserror.EBADF
-	}
-	return a.tmpfsFile.FileOperations.Seek(ctx, file, whence, offset)
-}
-
-// Read implements fs.FileOperations.Read.
-func (a *Area) Read(ctx context.Context, file *fs.File, dst usermem.IOSequence, offset int64) (int64, error) {
-	a.mu.Lock()
-	defer a.mu.Unlock()
-	if a.size == 0 {
-		return 0, nil
-	}
-	if a.tmpfsFile == nil {
-		return 0, syserror.EBADF
-	}
-	return a.tmpfsFile.FileOperations.Read(ctx, file, dst, offset)
-}
-
-// Write implements fs.FileOperations.Write.
-func (a *Area) Write(ctx context.Context, file *fs.File, src usermem.IOSequence, offset int64) (int64, error) {
-	return 0, syserror.ENOSYS
-}
-
-// ConfigureMMap implements fs.FileOperations.ConfigureMMap.
-func (a *Area) ConfigureMMap(ctx context.Context, file *fs.File, opts *memmap.MMapOpts) error {
-	a.mu.Lock()
-	defer a.mu.Unlock()
-	if a.size == 0 {
-		return syserror.EINVAL
-	}
-
-	if !a.perms.SupersetOf(opts.Perms) {
-		return syserror.EPERM
-	}
-	opts.MaxPerms = opts.MaxPerms.Intersect(a.perms)
-
-	if a.tmpfsFile == nil {
-		tmpfsInodeOps := tmpfs.NewInMemoryFile(ctx, usage.Tmpfs, fs.UnstableAttr{})
-		tmpfsInode := fs.NewInode(ctx, tmpfsInodeOps, fs.NewPseudoMountSource(ctx), fs.StableAttr{})
-		dirent := fs.NewDirent(ctx, tmpfsInode, namePrefix+"/"+a.name)
-		tmpfsFile, err := tmpfsInode.GetFile(ctx, dirent, fs.FileFlags{Read: true, Write: true})
-		// Drop the extra reference on the Dirent.
-		dirent.DecRef()
-
-		if err != nil {
-			return err
-		}
-
-		// Truncate to the size set by ASHMEM_SET_SIZE ioctl.
-		err = tmpfsInodeOps.Truncate(ctx, tmpfsInode, int64(a.size))
-		if err != nil {
-			return err
-		}
-		a.tmpfsFile = tmpfsFile
-		a.pb = NewPinBoard()
-	}
-
-	return a.tmpfsFile.ConfigureMMap(ctx, opts)
-}
-
-// Ioctl implements fs.FileOperations.Ioctl.
-func (a *Area) Ioctl(ctx context.Context, _ *fs.File, io usermem.IO, args arch.SyscallArguments) (uintptr, error) {
-	// Switch on ioctl request.
-	switch args[1].Uint() {
-	case linux.AshmemSetNameIoctl:
-		name, err := usermem.CopyStringIn(ctx, io, args[2].Pointer(), nameLen-1, usermem.IOOpts{
-			AddressSpaceActive: true,
-		})
-		if err != nil {
-			return 0, err
-		}
-
-		a.mu.Lock()
-		defer a.mu.Unlock()
-
-		// Cannot set name for already mapped ashmem.
-		if a.tmpfsFile != nil {
-			return 0, syserror.EINVAL
-		}
-		a.name = name
-		return 0, nil
-
-	case linux.AshmemGetNameIoctl:
-		a.mu.Lock()
-		var local []byte
-		if a.name != "" {
-			nameLen := len([]byte(a.name))
-			local = make([]byte, nameLen, nameLen+1)
-			copy(local, []byte(a.name))
-			local = append(local, 0)
-		} else {
-			nameLen := len([]byte(namePrefix))
-			local = make([]byte, nameLen, nameLen+1)
-			copy(local, []byte(namePrefix))
-			local = append(local, 0)
-		}
-		a.mu.Unlock()
-
-		if _, err := io.CopyOut(ctx, args[2].Pointer(), local, usermem.IOOpts{
-			AddressSpaceActive: true,
-		}); err != nil {
-			return 0, syserror.EFAULT
-		}
-		return 0, nil
-
-	case linux.AshmemSetSizeIoctl:
-		a.mu.Lock()
-		defer a.mu.Unlock()
-
-		// Cannot set size for already mapped ashmem.
-		if a.tmpfsFile != nil {
-			return 0, syserror.EINVAL
-		}
-		a.size = uint64(args[2].SizeT())
-		return 0, nil
-
-	case linux.AshmemGetSizeIoctl:
-		return uintptr(a.size), nil
-
-	case linux.AshmemPinIoctl, linux.AshmemUnpinIoctl, linux.AshmemGetPinStatusIoctl:
-		// Locking and unlocking is ok since once tmpfsFile is set, it won't be nil again
-		// even after unmapping! Unlocking is needed in order to avoid a deadlock on
-		// usermem.CopyObjectIn.
-
-		// Cannot execute pin-related ioctls before mapping.
-		a.mu.Lock()
-		if a.tmpfsFile == nil {
-			a.mu.Unlock()
-			return 0, syserror.EINVAL
-		}
-		a.mu.Unlock()
-
-		var pin linux.AshmemPin
-		_, err := usermem.CopyObjectIn(ctx, io, args[2].Pointer(), &pin, usermem.IOOpts{
-			AddressSpaceActive: true,
-		})
-		if err != nil {
-			return 0, syserror.EFAULT
-		}
-
-		a.mu.Lock()
-		defer a.mu.Unlock()
-		return a.pinOperation(pin, args[1].Uint())
-
-	case linux.AshmemPurgeAllCachesIoctl:
-		return 0, nil
-
-	case linux.AshmemSetProtMaskIoctl:
-		prot := uint64(args[2].ModeT())
-		perms := usermem.AccessType{
-			Read:    prot&linux.PROT_READ != 0,
-			Write:   prot&linux.PROT_WRITE != 0,
-			Execute: prot&linux.PROT_EXEC != 0,
-		}
-
-		a.mu.Lock()
-		defer a.mu.Unlock()
-
-		// Can only narrow prot mask.
-		if !a.perms.SupersetOf(perms) {
-			return 0, syserror.EINVAL
-		}
-
-		// TODO(b/30946773,gvisor.dev/issue/153): If personality flag
-		// READ_IMPLIES_EXEC is set, set PROT_EXEC if PORT_READ is set.
-
-		a.perms = perms
-		return 0, nil
-
-	case linux.AshmemGetProtMaskIoctl:
-		return uintptr(a.perms.Prot()), nil
-	default:
-		// Ioctls irrelevant to Ashmem.
-		return 0, syserror.EINVAL
-	}
-}
-
-// pinOperation should only be called while holding a.mu.
-func (a *Area) pinOperation(pin linux.AshmemPin, op uint32) (uintptr, error) {
-	// Page-align a.size for checks.
-	pageAlignedSize, ok := usermem.Addr(a.size).RoundUp()
-	if !ok {
-		return 0, syserror.EINVAL
-	}
-	// Len 0 means everything onward.
-	if pin.Len == 0 {
-		pin.Len = uint32(pageAlignedSize) - pin.Offset
-	}
-	// Both Offset and Len have to be page-aligned.
-	if pin.Offset%uint32(usermem.PageSize) != 0 {
-		return 0, syserror.EINVAL
-	}
-	if pin.Len%uint32(usermem.PageSize) != 0 {
-		return 0, syserror.EINVAL
-	}
-	// Adding Offset and Len must not cause an uint32 overflow.
-	if end := pin.Offset + pin.Len; end < pin.Offset {
-		return 0, syserror.EINVAL
-	}
-	// Pin range must not exceed a's size.
-	if uint32(pageAlignedSize) < pin.Offset+pin.Len {
-		return 0, syserror.EINVAL
-	}
-	// Handle each operation.
-	r := RangeFromAshmemPin(pin)
-	switch op {
-	case linux.AshmemPinIoctl:
-		if a.pb.PinRange(r) {
-			return linux.AshmemWasPurged, nil
-		}
-		return linux.AshmemNotPurged, nil
-
-	case linux.AshmemUnpinIoctl:
-		// TODO(b/30946773): Implement purge on unpin.
-		a.pb.UnpinRange(r)
-		return 0, nil
-
-	case linux.AshmemGetPinStatusIoctl:
-		if a.pb.RangePinnedStatus(r) {
-			return linux.AshmemIsPinned, nil
-		}
-		return linux.AshmemIsUnpinned, nil
-
-	default:
-		panic("unreachable")
-	}
-
-}