1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
// 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 (
"fmt"
"strconv"
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/sentry/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/syserror"
)
type selfSymlink struct {
kernfs.InodeAttrs
kernfs.InodeNoopRefCount
kernfs.InodeSymlink
pidns *kernel.PIDNamespace
}
var _ kernfs.Inode = (*selfSymlink)(nil)
func newSelfSymlink(creds *auth.Credentials, ino uint64, perm linux.FileMode, pidns *kernel.PIDNamespace) *kernfs.Dentry {
inode := &selfSymlink{pidns: pidns}
inode.Init(creds, ino, linux.ModeSymlink|perm)
d := &kernfs.Dentry{}
d.Init(inode)
return d
}
func (s *selfSymlink) Readlink(ctx context.Context) (string, error) {
t := kernel.TaskFromContext(ctx)
if t == nil {
// Who is reading this link?
return "", syserror.EINVAL
}
tgid := s.pidns.IDOfThreadGroup(t.ThreadGroup())
if tgid == 0 {
return "", syserror.ENOENT
}
return strconv.FormatUint(uint64(tgid), 10), nil
}
type threadSelfSymlink struct {
kernfs.InodeAttrs
kernfs.InodeNoopRefCount
kernfs.InodeSymlink
pidns *kernel.PIDNamespace
}
var _ kernfs.Inode = (*threadSelfSymlink)(nil)
func newThreadSelfSymlink(creds *auth.Credentials, ino uint64, perm linux.FileMode, pidns *kernel.PIDNamespace) *kernfs.Dentry {
inode := &threadSelfSymlink{pidns: pidns}
inode.Init(creds, ino, linux.ModeSymlink|perm)
d := &kernfs.Dentry{}
d.Init(inode)
return d
}
func (s *threadSelfSymlink) Readlink(ctx context.Context) (string, error) {
t := kernel.TaskFromContext(ctx)
if t == nil {
// Who is reading this link?
return "", syserror.EINVAL
}
tgid := s.pidns.IDOfThreadGroup(t.ThreadGroup())
tid := s.pidns.IDOfTask(t)
if tid == 0 || tgid == 0 {
return "", syserror.ENOENT
}
return fmt.Sprintf("%d/task/%d", tgid, tid), nil
}
|
