93 lines
2.4 KiB
Go
93 lines
2.4 KiB
Go
// Copyright 2019 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 proc
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import (
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"fmt"
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"strconv"
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"gvisor.dev/gvisor/pkg/abi/linux"
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"gvisor.dev/gvisor/pkg/sentry/context"
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"gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs"
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"gvisor.dev/gvisor/pkg/sentry/kernel"
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"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
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"gvisor.dev/gvisor/pkg/syserror"
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)
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type selfSymlink struct {
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kernfs.InodeAttrs
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kernfs.InodeNoopRefCount
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kernfs.InodeSymlink
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pidns *kernel.PIDNamespace
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}
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var _ kernfs.Inode = (*selfSymlink)(nil)
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func newSelfSymlink(creds *auth.Credentials, ino uint64, perm linux.FileMode, pidns *kernel.PIDNamespace) *kernfs.Dentry {
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inode := &selfSymlink{pidns: pidns}
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inode.Init(creds, ino, linux.ModeSymlink|perm)
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d := &kernfs.Dentry{}
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d.Init(inode)
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return d
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}
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func (s *selfSymlink) Readlink(ctx context.Context) (string, error) {
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t := kernel.TaskFromContext(ctx)
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if t == nil {
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// Who is reading this link?
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return "", syserror.EINVAL
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}
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tgid := s.pidns.IDOfThreadGroup(t.ThreadGroup())
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if tgid == 0 {
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return "", syserror.ENOENT
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}
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return strconv.FormatUint(uint64(tgid), 10), nil
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}
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type threadSelfSymlink struct {
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kernfs.InodeAttrs
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kernfs.InodeNoopRefCount
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kernfs.InodeSymlink
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pidns *kernel.PIDNamespace
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}
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var _ kernfs.Inode = (*threadSelfSymlink)(nil)
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func newThreadSelfSymlink(creds *auth.Credentials, ino uint64, perm linux.FileMode, pidns *kernel.PIDNamespace) *kernfs.Dentry {
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inode := &threadSelfSymlink{pidns: pidns}
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inode.Init(creds, ino, linux.ModeSymlink|perm)
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d := &kernfs.Dentry{}
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d.Init(inode)
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return d
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}
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func (s *threadSelfSymlink) Readlink(ctx context.Context) (string, error) {
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t := kernel.TaskFromContext(ctx)
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if t == nil {
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// Who is reading this link?
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return "", syserror.EINVAL
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}
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tgid := s.pidns.IDOfThreadGroup(t.ThreadGroup())
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tid := s.pidns.IDOfTask(t)
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if tid == 0 || tgid == 0 {
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return "", syserror.ENOENT
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}
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return fmt.Sprintf("%d/task/%d", tgid, tid), nil
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}
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