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
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
// 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 mm
import (
"gvisor.dev/gvisor/pkg/sentry/arch"
"gvisor.dev/gvisor/pkg/sentry/fsbridge"
"gvisor.dev/gvisor/pkg/usermem"
)
// Dumpability describes if and how core dumps should be created.
type Dumpability int
const (
// NotDumpable indicates that core dumps should never be created.
NotDumpable Dumpability = iota
// UserDumpable indicates that core dumps should be created, owned by
// the current user.
UserDumpable
// RootDumpable indicates that core dumps should be created, owned by
// root.
RootDumpable
)
// Dumpability returns the dumpability.
func (mm *MemoryManager) Dumpability() Dumpability {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
return mm.dumpability
}
// SetDumpability sets the dumpability.
func (mm *MemoryManager) SetDumpability(d Dumpability) {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
mm.dumpability = d
}
// ArgvStart returns the start of the application argument vector.
//
// There is no guarantee that this value is sensible w.r.t. ArgvEnd.
func (mm *MemoryManager) ArgvStart() usermem.Addr {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
return mm.argv.Start
}
// SetArgvStart sets the start of the application argument vector.
func (mm *MemoryManager) SetArgvStart(a usermem.Addr) {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
mm.argv.Start = a
}
// ArgvEnd returns the end of the application argument vector.
//
// There is no guarantee that this value is sensible w.r.t. ArgvStart.
func (mm *MemoryManager) ArgvEnd() usermem.Addr {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
return mm.argv.End
}
// SetArgvEnd sets the end of the application argument vector.
func (mm *MemoryManager) SetArgvEnd(a usermem.Addr) {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
mm.argv.End = a
}
// EnvvStart returns the start of the application environment vector.
//
// There is no guarantee that this value is sensible w.r.t. EnvvEnd.
func (mm *MemoryManager) EnvvStart() usermem.Addr {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
return mm.envv.Start
}
// SetEnvvStart sets the start of the application environment vector.
func (mm *MemoryManager) SetEnvvStart(a usermem.Addr) {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
mm.envv.Start = a
}
// EnvvEnd returns the end of the application environment vector.
//
// There is no guarantee that this value is sensible w.r.t. EnvvStart.
func (mm *MemoryManager) EnvvEnd() usermem.Addr {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
return mm.envv.End
}
// SetEnvvEnd sets the end of the application environment vector.
func (mm *MemoryManager) SetEnvvEnd(a usermem.Addr) {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
mm.envv.End = a
}
// Auxv returns the current map of auxiliary vectors.
func (mm *MemoryManager) Auxv() arch.Auxv {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
return append(arch.Auxv(nil), mm.auxv...)
}
// SetAuxv sets the entire map of auxiliary vectors.
func (mm *MemoryManager) SetAuxv(auxv arch.Auxv) {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
mm.auxv = append(arch.Auxv(nil), auxv...)
}
// Executable returns the executable, if available.
//
// An additional reference will be taken in the case of a non-nil executable,
// which must be released by the caller.
func (mm *MemoryManager) Executable() fsbridge.File {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
if mm.executable == nil {
return nil
}
mm.executable.IncRef()
return mm.executable
}
// SetExecutable sets the executable.
//
// This takes a reference on d.
func (mm *MemoryManager) SetExecutable(file fsbridge.File) {
mm.metadataMu.Lock()
// Grab a new reference.
file.IncRef()
// Set the executable.
orig := mm.executable
mm.executable = file
mm.metadataMu.Unlock()
// Release the old reference.
//
// Do this without holding the lock, since it may wind up doing some
// I/O to sync the dirent, etc.
if orig != nil {
orig.DecRef()
}
}
// VDSOSigReturn returns the address of vdso_sigreturn.
func (mm *MemoryManager) VDSOSigReturn() uint64 {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
return mm.vdsoSigReturnAddr
}
// SetVDSOSigReturn sets the address of vdso_sigreturn.
func (mm *MemoryManager) SetVDSOSigReturn(addr uint64) {
mm.metadataMu.Lock()
defer mm.metadataMu.Unlock()
mm.vdsoSigReturnAddr = addr
}
|
