1 files changed, 0 insertions, 249 deletions
diff --git a/pkg/sentry/fsimpl/proc/task.go b/pkg/sentry/fsimpl/proc/task.go
deleted file mode 100644
index eb5bc62c0..000000000
--- a/pkg/sentry/fsimpl/proc/task.go
+++ /dev/null
@@ -1,249 +0,0 @@
-// Copyright 2019 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 proc
-
-import (
-	"bytes"
-	"fmt"
-
-	"gvisor.dev/gvisor/pkg/abi/linux"
-	"gvisor.dev/gvisor/pkg/context"
-	"gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs"
-	"gvisor.dev/gvisor/pkg/sentry/kernel"
-	"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
-	"gvisor.dev/gvisor/pkg/sentry/mm"
-	"gvisor.dev/gvisor/pkg/sentry/vfs"
-	"gvisor.dev/gvisor/pkg/syserror"
-)
-
-// taskInode represents the inode for /proc/PID/ directory.
-//
-// +stateify savable
-type taskInode struct {
-	kernfs.InodeNotSymlink
-	kernfs.InodeDirectoryNoNewChildren
-	kernfs.InodeNoDynamicLookup
-	kernfs.InodeAttrs
-	kernfs.OrderedChildren
-
-	task *kernel.Task
-}
-
-var _ kernfs.Inode = (*taskInode)(nil)
-
-func newTaskInode(inoGen InoGenerator, task *kernel.Task, pidns *kernel.PIDNamespace, isThreadGroup bool, cgroupControllers map[string]string) *kernfs.Dentry {
-	contents := map[string]*kernfs.Dentry{
-		"auxv":    newTaskOwnedFile(task, inoGen.NextIno(), 0444, &auxvData{task: task}),
-		"cmdline": newTaskOwnedFile(task, inoGen.NextIno(), 0444, &cmdlineData{task: task, arg: cmdlineDataArg}),
-		"comm":    newComm(task, inoGen.NextIno(), 0444),
-		"environ": newTaskOwnedFile(task, inoGen.NextIno(), 0444, &cmdlineData{task: task, arg: environDataArg}),
-		//"exe":       newExe(t, msrc),
-		//"fd":        newFdDir(t, msrc),
-		//"fdinfo":    newFdInfoDir(t, msrc),
-		"gid_map": newTaskOwnedFile(task, inoGen.NextIno(), 0644, &idMapData{task: task, gids: true}),
-		"io":      newTaskOwnedFile(task, inoGen.NextIno(), 0400, newIO(task, isThreadGroup)),
-		"maps":    newTaskOwnedFile(task, inoGen.NextIno(), 0444, &mapsData{task: task}),
-		//"mountinfo": seqfile.NewSeqFileInode(t, &mountInfoFile{t: t}, msrc),
-		//"mounts":    seqfile.NewSeqFileInode(t, &mountsFile{t: t}, msrc),
-		"ns": newTaskOwnedDir(task, inoGen.NextIno(), 0511, map[string]*kernfs.Dentry{
-			"net":  newNamespaceSymlink(task, inoGen.NextIno(), "net"),
-			"pid":  newNamespaceSymlink(task, inoGen.NextIno(), "pid"),
-			"user": newNamespaceSymlink(task, inoGen.NextIno(), "user"),
-		}),
-		"smaps":   newTaskOwnedFile(task, inoGen.NextIno(), 0444, &smapsData{task: task}),
-		"stat":    newTaskOwnedFile(task, inoGen.NextIno(), 0444, &taskStatData{task: task, pidns: pidns, tgstats: isThreadGroup}),
-		"statm":   newTaskOwnedFile(task, inoGen.NextIno(), 0444, &statmData{task: task}),
-		"status":  newTaskOwnedFile(task, inoGen.NextIno(), 0444, &statusData{task: task, pidns: pidns}),
-		"uid_map": newTaskOwnedFile(task, inoGen.NextIno(), 0644, &idMapData{task: task, gids: false}),
-	}
-	if isThreadGroup {
-		contents["task"] = newSubtasks(task, pidns, inoGen, cgroupControllers)
-	}
-	if len(cgroupControllers) > 0 {
-		contents["cgroup"] = newTaskOwnedFile(task, inoGen.NextIno(), 0444, newCgroupData(cgroupControllers))
-	}
-
-	taskInode := &taskInode{task: task}
-	// Note: credentials are overridden by taskOwnedInode.
-	taskInode.InodeAttrs.Init(task.Credentials(), inoGen.NextIno(), linux.ModeDirectory|0555)
-
-	inode := &taskOwnedInode{Inode: taskInode, owner: task}
-	dentry := &kernfs.Dentry{}
-	dentry.Init(inode)
-
-	taskInode.OrderedChildren.Init(kernfs.OrderedChildrenOptions{})
-	links := taskInode.OrderedChildren.Populate(dentry, contents)
-	taskInode.IncLinks(links)
-
-	return dentry
-}
-
-// Valid implements kernfs.inodeDynamicLookup. This inode remains valid as long
-// as the task is still running. When it's dead, another tasks with the same
-// PID could replace it.
-func (i *taskInode) Valid(ctx context.Context) bool {
-	return i.task.ExitState() != kernel.TaskExitDead
-}
-
-// Open implements kernfs.Inode.
-func (i *taskInode) Open(rp *vfs.ResolvingPath, vfsd *vfs.Dentry, flags uint32) (*vfs.FileDescription, error) {
-	fd := &kernfs.GenericDirectoryFD{}
-	fd.Init(rp.Mount(), vfsd, &i.OrderedChildren, flags)
-	return fd.VFSFileDescription(), nil
-}
-
-// SetStat implements kernfs.Inode.
-func (i *taskInode) SetStat(_ *vfs.Filesystem, opts vfs.SetStatOptions) error {
-	stat := opts.Stat
-	if stat.Mask&linux.STATX_MODE != 0 {
-		return syserror.EPERM
-	}
-	return nil
-}
-
-// taskOwnedInode implements kernfs.Inode and overrides inode owner with task
-// effective user and group.
-type taskOwnedInode struct {
-	kernfs.Inode
-
-	// owner is the task that owns this inode.
-	owner *kernel.Task
-}
-
-var _ kernfs.Inode = (*taskOwnedInode)(nil)
-
-func newTaskOwnedFile(task *kernel.Task, ino uint64, perm linux.FileMode, inode dynamicInode) *kernfs.Dentry {
-	// Note: credentials are overridden by taskOwnedInode.
-	inode.Init(task.Credentials(), ino, inode, perm)
-
-	taskInode := &taskOwnedInode{Inode: inode, owner: task}
-	d := &kernfs.Dentry{}
-	d.Init(taskInode)
-	return d
-}
-
-func newTaskOwnedDir(task *kernel.Task, ino uint64, perm linux.FileMode, children map[string]*kernfs.Dentry) *kernfs.Dentry {
-	dir := &kernfs.StaticDirectory{}
-
-	// Note: credentials are overridden by taskOwnedInode.
-	dir.Init(task.Credentials(), ino, perm)
-
-	inode := &taskOwnedInode{Inode: dir, owner: task}
-	d := &kernfs.Dentry{}
-	d.Init(inode)
-
-	dir.OrderedChildren.Init(kernfs.OrderedChildrenOptions{})
-	links := dir.OrderedChildren.Populate(d, children)
-	dir.IncLinks(links)
-
-	return d
-}
-
-// Stat implements kernfs.Inode.
-func (i *taskOwnedInode) Stat(fs *vfs.Filesystem) linux.Statx {
-	stat := i.Inode.Stat(fs)
-	uid, gid := i.getOwner(linux.FileMode(stat.Mode))
-	stat.UID = uint32(uid)
-	stat.GID = uint32(gid)
-	return stat
-}
-
-// CheckPermissions implements kernfs.Inode.
-func (i *taskOwnedInode) CheckPermissions(_ context.Context, creds *auth.Credentials, ats vfs.AccessTypes) error {
-	mode := i.Mode()
-	uid, gid := i.getOwner(mode)
-	return vfs.GenericCheckPermissions(
-		creds,
-		ats,
-		mode.FileType() == linux.ModeDirectory,
-		uint16(mode),
-		uid,
-		gid,
-	)
-}
-
-func (i *taskOwnedInode) getOwner(mode linux.FileMode) (auth.KUID, auth.KGID) {
-	// By default, set the task owner as the file owner.
-	creds := i.owner.Credentials()
-	uid := creds.EffectiveKUID
-	gid := creds.EffectiveKGID
-
-	// Linux doesn't apply dumpability adjustments to world readable/executable
-	// directories so that applications can stat /proc/PID to determine the
-	// effective UID of a process. See fs/proc/base.c:task_dump_owner.
-	if mode.FileType() == linux.ModeDirectory && mode.Permissions() == 0555 {
-		return uid, gid
-	}
-
-	// If the task is not dumpable, then root (in the namespace preferred)
-	// owns the file.
-	m := getMM(i.owner)
-	if m == nil {
-		return auth.RootKUID, auth.RootKGID
-	}
-	if m.Dumpability() != mm.UserDumpable {
-		uid = auth.RootKUID
-		if kuid := creds.UserNamespace.MapToKUID(auth.RootUID); kuid.Ok() {
-			uid = kuid
-		}
-		gid = auth.RootKGID
-		if kgid := creds.UserNamespace.MapToKGID(auth.RootGID); kgid.Ok() {
-			gid = kgid
-		}
-	}
-	return uid, gid
-}
-
-func newIO(t *kernel.Task, isThreadGroup bool) *ioData {
-	if isThreadGroup {
-		return &ioData{ioUsage: t.ThreadGroup()}
-	}
-	return &ioData{ioUsage: t}
-}
-
-func newNamespaceSymlink(task *kernel.Task, ino uint64, ns string) *kernfs.Dentry {
-	// Namespace symlinks should contain the namespace name and the inode number
-	// for the namespace instance, so for example user:[123456]. We currently fake
-	// the inode number by sticking the symlink inode in its place.
-	target := fmt.Sprintf("%s:[%d]", ns, ino)
-
-	inode := &kernfs.StaticSymlink{}
-	// Note: credentials are overridden by taskOwnedInode.
-	inode.Init(task.Credentials(), ino, target)
-
-	taskInode := &taskOwnedInode{Inode: inode, owner: task}
-	d := &kernfs.Dentry{}
-	d.Init(taskInode)
-	return d
-}
-
-// newCgroupData creates inode that shows cgroup information.
-// From man 7 cgroups: "For each cgroup hierarchy of which the process is a
-// member, there is one entry containing three colon-separated fields:
-//   hierarchy-ID:controller-list:cgroup-path"
-func newCgroupData(controllers map[string]string) dynamicInode {
-	buf := bytes.Buffer{}
-
-	// The hierarchy ids must be positive integers (for cgroup v1), but the
-	// exact number does not matter, so long as they are unique. We can
-	// just use a counter, but since linux sorts this file in descending
-	// order, we must count down to preserve this behavior.
-	i := len(controllers)
-	for name, dir := range controllers {
-		fmt.Fprintf(&buf, "%d:%s:%s\n", i, name, dir)
-		i--
-	}
-	return newStaticFile(buf.String())
-}