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
184
185
186
187
188
189
190
191
192
|
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "mojo/shell/runner/host/child_process_host.h"
#include <stdint.h>
#include <utility>
#include "base/bind.h"
#include "base/command_line.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/message_loop/message_loop.h"
#include "base/process/kill.h"
#include "base/process/launch.h"
#include "base/task_runner.h"
#include "base/thread_task_runner_handle.h"
#include "mojo/edk/embedder/embedder.h"
#include "mojo/public/cpp/bindings/interface_ptr_info.h"
#include "mojo/public/cpp/system/core.h"
#include "mojo/shell/native_runner_delegate.h"
#include "mojo/shell/runner/common/client_util.h"
#include "mojo/shell/runner/common/switches.h"
#if defined(OS_LINUX) && !defined(OS_ANDROID)
#include "sandbox/linux/services/namespace_sandbox.h"
#endif
#if defined(OS_WIN)
#include "base/win/windows_version.h"
#endif
namespace mojo {
namespace shell {
ChildProcessHost::ChildProcessHost(base::TaskRunner* launch_process_runner,
NativeRunnerDelegate* delegate,
bool start_sandboxed,
const Identity& target,
const base::FilePath& app_path)
: launch_process_runner_(launch_process_runner),
delegate_(delegate),
start_sandboxed_(start_sandboxed),
target_(target),
app_path_(app_path),
start_child_process_event_(false, false),
weak_factory_(this) {
}
ChildProcessHost::~ChildProcessHost() {
if (!app_path_.empty()) {
CHECK(!mojo_ipc_channel_)
<< "Destroying ChildProcessHost before calling Join";
}
}
mojom::ShellClientPtr ChildProcessHost::Start(
const String& name,
const ProcessReadyCallback& callback,
const base::Closure& quit_closure) {
DCHECK(!child_process_.IsValid());
const base::CommandLine* parent_command_line =
base::CommandLine::ForCurrentProcess();
base::FilePath target_path = parent_command_line->GetProgram();
// |app_path_| can be empty in tests.
if (!app_path_.MatchesExtension(FILE_PATH_LITERAL(".mojo")) &&
!app_path_.empty()) {
target_path = app_path_;
}
scoped_ptr<base::CommandLine> child_command_line(
new base::CommandLine(target_path));
child_command_line->AppendArguments(*parent_command_line, false);
if (target_path != app_path_)
child_command_line->AppendSwitchPath(switches::kChildProcess, app_path_);
if (start_sandboxed_)
child_command_line->AppendSwitch(switches::kEnableSandbox);
mojo_ipc_channel_.reset(new edk::PlatformChannelPair);
mojo_ipc_channel_->PrepareToPassClientHandleToChildProcess(
child_command_line.get(), &handle_passing_info_);
mojom::ShellClientPtr client =
PassShellClientRequestOnCommandLine(child_command_line.get());
launch_process_runner_->PostTaskAndReply(
FROM_HERE,
base::Bind(&ChildProcessHost::DoLaunch, base::Unretained(this),
base::Passed(&child_command_line)),
base::Bind(&ChildProcessHost::DidStart,
weak_factory_.GetWeakPtr(), callback));
return client;
}
void ChildProcessHost::Join() {
if (mojo_ipc_channel_)
start_child_process_event_.Wait();
mojo_ipc_channel_.reset();
if (child_process_.IsValid()) {
int rv = -1;
LOG_IF(ERROR, !child_process_.WaitForExit(&rv))
<< "Failed to wait for child process";
child_process_.Close();
}
}
void ChildProcessHost::DidStart(const ProcessReadyCallback& callback) {
if (child_process_.IsValid()) {
callback.Run(child_process_.Pid());
} else {
LOG(ERROR) << "Failed to start child process";
mojo_ipc_channel_.reset();
}
}
void ChildProcessHost::DoLaunch(
scoped_ptr<base::CommandLine> child_command_line) {
if (delegate_) {
delegate_->AdjustCommandLineArgumentsForTarget(target_,
child_command_line.get());
}
base::LaunchOptions options;
#if defined(OS_WIN)
options.handles_to_inherit = &handle_passing_info_;
#if defined(OFFICIAL_BUILD)
CHECK(false) << "Launching mojo process with inherit_handles is insecure!";
#endif
options.inherit_handles = true;
options.stdin_handle = INVALID_HANDLE_VALUE;
options.stdout_handle = GetStdHandle(STD_OUTPUT_HANDLE);
options.stderr_handle = GetStdHandle(STD_ERROR_HANDLE);
// Always inherit stdout/stderr as a pair.
if (!options.stdout_handle || !options.stdin_handle)
options.stdin_handle = options.stdout_handle = nullptr;
// Pseudo handles are used when stdout and stderr redirect to the console. In
// that case, they're automatically inherited by child processes. See
// https://msdn.microsoft.com/en-us/library/windows/desktop/ms682075.aspx
// Trying to add them to the list of handles to inherit causes CreateProcess
// to fail. When this process is launched from Python
// (i.e. by apptest_runner.py) then a real handle is used. In that case, we do
// want to add it to the list of handles that is inherited.
if (options.stdout_handle &&
GetFileType(options.stdout_handle) != FILE_TYPE_CHAR) {
handle_passing_info_.push_back(options.stdout_handle);
}
if (options.stderr_handle &&
GetFileType(options.stderr_handle) != FILE_TYPE_CHAR &&
options.stdout_handle != options.stderr_handle) {
handle_passing_info_.push_back(options.stderr_handle);
}
#elif defined(OS_POSIX)
handle_passing_info_.push_back(std::make_pair(STDIN_FILENO, STDIN_FILENO));
handle_passing_info_.push_back(std::make_pair(STDOUT_FILENO, STDOUT_FILENO));
handle_passing_info_.push_back(std::make_pair(STDERR_FILENO, STDERR_FILENO));
options.fds_to_remap = &handle_passing_info_;
#endif
DVLOG(2) << "Launching child with command line: "
<< child_command_line->GetCommandLineString();
#if defined(OS_LINUX) && !defined(OS_ANDROID)
if (start_sandboxed_) {
child_process_ =
sandbox::NamespaceSandbox::LaunchProcess(*child_command_line, options);
if (!child_process_.IsValid()) {
LOG(ERROR) << "Starting the process with a sandbox failed. Missing kernel"
<< " support.";
}
} else
#endif
child_process_ = base::LaunchProcess(*child_command_line, options);
if (child_process_.IsValid()) {
if (mojo_ipc_channel_.get()) {
mojo_ipc_channel_->ChildProcessLaunched();
mojo::edk::ChildProcessLaunched(
child_process_.Handle(),
mojo::edk::ScopedPlatformHandle(mojo::edk::PlatformHandle(
mojo_ipc_channel_->PassServerHandle().release().handle)));
}
}
start_child_process_event_.Signal();
}
} // namespace shell
} // namespace mojo
|
