forked from chromium/chromium
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathcontent_main_runner_impl.cc
1185 lines (1014 loc) · 43.6 KB
/
content_main_runner_impl.cc
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
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
// Copyright (c) 2012 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 "content/app/content_main_runner_impl.h"
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "base/allocator/allocator_check.h"
#include "base/at_exit.h"
#include "base/base_switches.h"
#include "base/bind.h"
#include "base/callback_helpers.h"
#include "base/command_line.h"
#include "base/compiler_specific.h"
#include "base/debug/debugger.h"
#include "base/debug/leak_annotations.h"
#include "base/debug/stack_trace.h"
#include "base/files/file_path.h"
#include "base/i18n/icu_util.h"
#include "base/lazy_instance.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/metrics/field_trial.h"
#include "base/metrics/histogram_base.h"
#include "base/path_service.h"
#include "base/power_monitor/power_monitor.h"
#include "base/power_monitor/power_monitor_device_source.h"
#include "base/process/launch.h"
#include "base/process/memory.h"
#include "base/process/process.h"
#include "base/process/process_handle.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/task/post_task.h"
#include "base/task/single_thread_task_runner_forward.h"
#include "base/task/thread_pool/thread_pool_instance.h"
#include "base/threading/hang_watcher.h"
#include "base/threading/platform_thread.h"
#include "base/time/time.h"
#include "base/trace_event/trace_event.h"
#include "build/build_config.h"
#include "build/chromeos_buildflags.h"
#include "components/discardable_memory/service/discardable_shared_memory_manager.h"
#include "components/download/public/common/download_task_runner.h"
#include "components/power_scheduler/power_mode_arbiter.h"
#include "components/variations/variations_ids_provider.h"
#include "content/app/mojo/mojo_init.h"
#include "content/app/mojo_ipc_support.h"
#include "content/browser/browser_main.h"
#include "content/browser/browser_process_io_thread.h"
#include "content/browser/browser_thread_impl.h"
#include "content/browser/gpu/gpu_main_thread_factory.h"
#include "content/browser/renderer_host/render_process_host_impl.h"
#include "content/browser/scheduler/browser_task_executor.h"
#include "content/browser/startup_data_impl.h"
#include "content/browser/startup_helper.h"
#include "content/browser/tracing/memory_instrumentation_util.h"
#include "content/browser/utility_process_host.h"
#include "content/child/field_trial.h"
#include "content/common/android/cpu_time_metrics.h"
#include "content/common/content_constants_internal.h"
#include "content/common/mojo_core_library_support.h"
#include "content/common/partition_alloc_support.h"
#include "content/common/url_schemes.h"
#include "content/gpu/in_process_gpu_thread.h"
#include "content/public/app/content_main_delegate.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/browser/tracing_delegate.h"
#include "content/public/common/content_client.h"
#include "content/public/common/content_constants.h"
#include "content/public/common/content_descriptor_keys.h"
#include "content/public/common/content_features.h"
#include "content/public/common/content_paths.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/main_function_params.h"
#include "content/public/common/network_service_util.h"
#include "content/public/common/sandbox_init.h"
#include "content/public/common/zygote/zygote_buildflags.h"
#include "content/public/gpu/content_gpu_client.h"
#include "content/public/renderer/content_renderer_client.h"
#include "content/public/utility/content_utility_client.h"
#include "content/renderer/in_process_renderer_thread.h"
#include "content/utility/in_process_utility_thread.h"
#include "gin/v8_initializer.h"
#include "media/base/media.h"
#include "media/media_buildflags.h"
#include "mojo/core/embedder/embedder.h"
#include "mojo/public/cpp/bindings/self_owned_receiver.h"
#include "mojo/public/cpp/platform/platform_channel.h"
#include "mojo/public/cpp/system/dynamic_library_support.h"
#include "mojo/public/cpp/system/invitation.h"
#include "mojo/public/cpp/system/message_pipe.h"
#include "ppapi/buildflags/buildflags.h"
#include "sandbox/policy/sandbox_type.h"
#include "sandbox/policy/switches.h"
#include "services/network/public/cpp/features.h"
#include "services/tracing/public/cpp/perfetto/perfetto_traced_process.h"
#include "services/tracing/public/cpp/trace_startup.h"
#include "services/tracing/public/cpp/tracing_features.h"
#include "third_party/blink/public/common/origin_trials/trial_token_validator.h"
#include "ui/base/ui_base_paths.h"
#include "ui/base/ui_base_switches.h"
#include "ui/display/display_switches.h"
#include "ui/gfx/switches.h"
#if defined(OS_WIN)
#include <malloc.h>
#include <cstring>
#include "base/trace_event/trace_event_etw_export_win.h"
#include "ui/base/l10n/l10n_util_win.h"
#include "ui/display/win/dpi.h"
#elif defined(OS_MAC)
#include "sandbox/mac/seatbelt.h"
#include "sandbox/mac/seatbelt_exec.h"
#endif // OS_WIN
#if defined(OS_POSIX) || defined(OS_FUCHSIA)
#include <signal.h>
#include "base/file_descriptor_store.h"
#include "base/posix/global_descriptors.h"
#include "content/public/common/content_descriptors.h"
#if !defined(OS_MAC)
#include "content/public/common/zygote/zygote_fork_delegate_linux.h"
#endif
#endif // OS_POSIX || OS_FUCHSIA
#if defined(OS_LINUX) || defined(OS_CHROMEOS)
#include "base/native_library.h"
#include "base/rand_util.h"
#include "content/public/common/zygote/sandbox_support_linux.h"
#include "third_party/blink/public/platform/web_font_render_style.h"
#include "third_party/boringssl/src/include/openssl/crypto.h"
#include "third_party/skia/include/core/SkFontMgr.h"
#include "third_party/skia/include/ports/SkFontMgr_android.h"
#include "third_party/webrtc_overrides/init_webrtc.h" // nogncheck
#if BUILDFLAG(ENABLE_PLUGINS)
#include "content/common/pepper_plugin_list.h"
#include "content/public/common/pepper_plugin_info.h"
#endif
#if BUILDFLAG(ENABLE_LIBRARY_CDMS)
#include "content/public/common/cdm_info.h"
#include "content/public/common/content_client.h"
#endif
#endif // defined(OS_LINUX) || defined(OS_CHROMEOS)
#if BUILDFLAG(USE_ZYGOTE_HANDLE)
#include "base/stack_canary_linux.h"
#include "content/browser/sandbox_host_linux.h"
#include "content/browser/zygote_host/zygote_host_impl_linux.h"
#include "content/common/zygote/zygote_communication_linux.h"
#include "content/common/zygote/zygote_handle_impl_linux.h"
#include "content/public/common/zygote/sandbox_support_linux.h"
#include "content/public/common/zygote/zygote_handle.h"
#include "content/zygote/zygote_main.h"
#include "media/base/media_switches.h"
#endif
#if defined(OS_ANDROID)
#include "base/system/sys_info.h"
#include "components/power_scheduler/power_scheduler.h"
#include "content/browser/android/battery_metrics.h"
#include "content/browser/android/browser_startup_controller.h"
#endif
namespace content {
extern int GpuMain(const content::MainFunctionParams&);
#if BUILDFLAG(ENABLE_PLUGINS)
extern int PpapiPluginMain(const MainFunctionParams&);
#endif
extern int RendererMain(const content::MainFunctionParams&);
extern int UtilityMain(const MainFunctionParams&);
} // namespace content
namespace content {
namespace {
#if defined(V8_USE_EXTERNAL_STARTUP_DATA) && defined(OS_ANDROID)
#if defined __LP64__
#define kV8SnapshotDataDescriptor kV8Snapshot64DataDescriptor
#else
#define kV8SnapshotDataDescriptor kV8Snapshot32DataDescriptor
#endif
#endif
#if defined(V8_USE_EXTERNAL_STARTUP_DATA)
gin::V8SnapshotFileType GetSnapshotType(const base::CommandLine& command_line) {
#if defined(OS_ANDROID) && defined(INCLUDE_BOTH_V8_SNAPSHOTS)
if (command_line.HasSwitch(switches::kUseContextSnapshotSwitch))
return gin::V8SnapshotFileType::kWithAdditionalContext;
return gin::V8SnapshotFileType::kDefault;
#elif defined(USE_V8_CONTEXT_SNAPSHOT)
return gin::V8SnapshotFileType::kWithAdditionalContext;
#else
return gin::V8SnapshotFileType::kDefault;
#endif
}
#if defined(OS_POSIX) && !defined(OS_MAC)
std::string GetSnapshotDataDescriptor(const base::CommandLine& command_line) {
#if defined(OS_ANDROID) && defined(INCLUDE_BOTH_V8_SNAPSHOTS)
if (command_line.HasSwitch(switches::kUseContextSnapshotSwitch))
return std::string();
return kV8SnapshotDataDescriptor;
#elif defined(USE_V8_CONTEXT_SNAPSHOT)
#if defined(OS_ANDROID)
// On android, the renderer loads the context snapshot directly.
return std::string();
#else
return kV8ContextSnapshotDataDescriptor;
#endif
#else
return kV8SnapshotDataDescriptor;
#endif
}
#endif
void LoadV8SnapshotFile(const base::CommandLine& command_line) {
const gin::V8SnapshotFileType snapshot_type = GetSnapshotType(command_line);
#if defined(OS_POSIX) && !defined(OS_MAC)
base::FileDescriptorStore& file_descriptor_store =
base::FileDescriptorStore::GetInstance();
base::MemoryMappedFile::Region region;
base::ScopedFD fd = file_descriptor_store.MaybeTakeFD(
GetSnapshotDataDescriptor(command_line), ®ion);
if (fd.is_valid()) {
base::File file(std::move(fd));
gin::V8Initializer::LoadV8SnapshotFromFile(std::move(file), ®ion,
snapshot_type);
return;
}
#endif // OS_POSIX && !OS_MAC
gin::V8Initializer::LoadV8Snapshot(snapshot_type);
}
bool ShouldLoadV8Snapshot(const base::CommandLine& command_line,
const std::string& process_type) {
// The gpu does not need v8, and the browser only needs v8 when in single
// process mode.
if (process_type == switches::kGpuProcess ||
(process_type.empty() &&
!command_line.HasSwitch(switches::kSingleProcess))) {
return false;
}
return true;
}
#endif // V8_USE_EXTERNAL_STARTUP_DATA
void LoadV8SnapshotIfNeeded(const base::CommandLine& command_line,
const std::string& process_type) {
#if defined(V8_USE_EXTERNAL_STARTUP_DATA)
if (ShouldLoadV8Snapshot(command_line, process_type))
LoadV8SnapshotFile(command_line);
#endif // V8_USE_EXTERNAL_STARTUP_DATA
}
#if BUILDFLAG(USE_ZYGOTE_HANDLE)
pid_t LaunchZygoteHelper(base::CommandLine* cmd_line,
base::ScopedFD* control_fd) {
// Append any switches from the browser process that need to be forwarded on
// to the zygote/renderers.
static const char* const kForwardSwitches[] = {
switches::kAndroidFontsPath,
switches::kClearKeyCdmPathForTesting,
switches::kEnableLogging, // Support, e.g., --enable-logging=stderr.
// Need to tell the zygote that it is headless so that we don't try to use
// the wrong type of main delegate.
switches::kHeadless,
// Zygote process needs to know what resources to have loaded when it
// becomes a renderer process.
switches::kForceDeviceScaleFactor,
switches::kLoggingLevel,
switches::kMojoCoreLibraryPath,
switches::kPpapiInProcess,
switches::kRegisterPepperPlugins,
switches::kV,
switches::kVModule,
};
cmd_line->CopySwitchesFrom(*base::CommandLine::ForCurrentProcess(),
kForwardSwitches, base::size(kForwardSwitches));
GetContentClient()->browser()->AppendExtraCommandLineSwitches(cmd_line, -1);
// Start up the sandbox host process and get the file descriptor for the
// sandboxed processes to talk to it.
base::FileHandleMappingVector additional_remapped_fds;
additional_remapped_fds.emplace_back(
SandboxHostLinux::GetInstance()->GetChildSocket(), GetSandboxFD());
return ZygoteHostImpl::GetInstance()->LaunchZygote(
cmd_line, control_fd, std::move(additional_remapped_fds));
}
// Initializes the Zygote sandbox host. No thread should be created before this
// call, as InitializeZygoteSandboxForBrowserProcess() will end-up using fork().
void InitializeZygoteSandboxForBrowserProcess(
const base::CommandLine& parsed_command_line) {
TRACE_EVENT0("startup", "SetupSandbox");
// SandboxHostLinux needs to be initialized even if the sandbox and
// zygote are both disabled. It initializes the sandboxed process socket.
SandboxHostLinux::GetInstance()->Init();
if (parsed_command_line.HasSwitch(switches::kNoZygote)) {
if (!parsed_command_line.HasSwitch(sandbox::policy::switches::kNoSandbox)) {
LOG(ERROR) << "--no-sandbox should be used together with --no--zygote";
exit(EXIT_FAILURE);
}
return;
}
// Tickle the zygote host so it forks now.
ZygoteHostImpl::GetInstance()->Init(parsed_command_line);
if (!parsed_command_line.HasSwitch(switches::kNoUnsandboxedZygote)) {
CreateUnsandboxedZygote(base::BindOnce(LaunchZygoteHelper));
}
ZygoteHandle generic_zygote =
CreateGenericZygote(base::BindOnce(LaunchZygoteHelper));
// TODO(kerrnel): Investigate doing this without the ZygoteHostImpl as a
// proxy. It is currently done this way due to concerns about race
// conditions.
ZygoteHostImpl::GetInstance()->SetRendererSandboxStatus(
generic_zygote->GetSandboxStatus());
}
#endif // BUILDFLAG(USE_ZYGOTE_HANDLE)
#if defined(OS_LINUX) || defined(OS_CHROMEOS)
#if BUILDFLAG(ENABLE_PLUGINS)
// Loads the (native) libraries but does not initialize them (i.e., does not
// call PPP_InitializeModule). This is needed by the zygote on Linux to get
// access to the plugins before entering the sandbox.
void PreloadPepperPlugins() {
std::vector<PepperPluginInfo> plugins;
ComputePepperPluginList(&plugins);
for (const auto& plugin : plugins) {
if (!plugin.is_internal) {
base::NativeLibraryLoadError error;
base::NativeLibrary library =
base::LoadNativeLibrary(plugin.path, &error);
LOG_IF(ERROR, !library) << "Unable to load plugin " << plugin.path.value()
<< " " << error.ToString();
}
}
}
#endif
#if BUILDFLAG(ENABLE_LIBRARY_CDMS)
// Loads registered library CDMs but does not initialize them. This is needed by
// the zygote on Linux to get access to the CDMs before entering the sandbox.
void PreloadLibraryCdms() {
std::vector<CdmInfo> cdms;
GetContentClient()->AddContentDecryptionModules(&cdms, nullptr);
for (const auto& cdm : cdms) {
base::NativeLibraryLoadError error;
base::NativeLibrary library = base::LoadNativeLibrary(cdm.path, &error);
LOG_IF(ERROR, !library) << "Unable to load CDM " << cdm.path.value()
<< " (error: " << error.ToString() << ")";
}
}
#endif // BUILDFLAG(ENABLE_LIBRARY_CDMS)
#if BUILDFLAG(USE_ZYGOTE_HANDLE)
void PreSandboxInit() {
// Pre-acquire resources needed by BoringSSL. See
// https://boringssl.googlesource.com/boringssl/+/HEAD/SANDBOXING.md
CRYPTO_pre_sandbox_init();
#if BUILDFLAG(ENABLE_PLUGINS)
// Ensure access to the Pepper plugins before the sandbox is turned on.
PreloadPepperPlugins();
#endif
#if BUILDFLAG(ENABLE_LIBRARY_CDMS)
// Ensure access to the library CDMs before the sandbox is turned on.
PreloadLibraryCdms();
#endif
InitializeWebRtcModule();
// Set the android SkFontMgr for blink. We need to ensure this is done
// before the sandbox is initialized to allow the font manager to access
// font configuration files on disk.
if (base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kAndroidFontsPath)) {
std::string android_fonts_dir =
base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
switches::kAndroidFontsPath);
if (android_fonts_dir.size() > 0 && android_fonts_dir.back() != '/')
android_fonts_dir += '/';
SkFontMgr_Android_CustomFonts custom;
custom.fSystemFontUse =
SkFontMgr_Android_CustomFonts::SystemFontUse::kOnlyCustom;
custom.fBasePath = android_fonts_dir.c_str();
std::string font_config;
std::string fallback_font_config;
if (android_fonts_dir.find("kitkat") != std::string::npos) {
font_config = android_fonts_dir + "system_fonts.xml";
fallback_font_config = android_fonts_dir + "fallback_fonts.xml";
custom.fFallbackFontsXml = fallback_font_config.c_str();
} else {
font_config = android_fonts_dir + "fonts.xml";
custom.fFallbackFontsXml = nullptr;
}
custom.fFontsXml = font_config.c_str();
custom.fIsolated = true;
blink::WebFontRenderStyle::SetSkiaFontManager(
SkFontMgr_New_Android(&custom));
}
}
#endif // BUILDFLAG(USE_ZYGOTE_HANDLE)
#endif // defined(OS_LINUX) || defined(OS_CHROMEOS)
mojo::ScopedMessagePipeHandle MaybeAcceptMojoInvitation() {
const auto& command_line = *base::CommandLine::ForCurrentProcess();
if (!mojo::PlatformChannel::CommandLineHasPassedEndpoint(command_line))
return {};
mojo::PlatformChannelEndpoint endpoint =
mojo::PlatformChannel::RecoverPassedEndpointFromCommandLine(command_line);
auto invitation = mojo::IncomingInvitation::Accept(std::move(endpoint));
return invitation.ExtractMessagePipe(0);
}
#if defined(OS_WIN)
void HandleConsoleControlEventOnBrowserUiThread(DWORD control_type) {
GetContentClient()->browser()->SessionEnding();
}
// A console control event handler for browser processes that initiates end
// session handling on the main thread and hangs the control thread.
BOOL WINAPI BrowserConsoleControlHandler(DWORD control_type) {
BrowserTaskExecutor::GetUIThreadTaskRunner(
{base::TaskPriority::USER_BLOCKING})
->PostTask(FROM_HERE,
base::BindOnce(&HandleConsoleControlEventOnBrowserUiThread,
control_type));
// Block the control thread while waiting for SessionEnding to be handled.
base::PlatformThread::Sleep(base::Hours(1));
// This should never be hit. The process will be terminated either by
// ContentBrowserClient::SessionEnding or by Windows, if the former takes too
// long.
return TRUE; // Handled.
}
// A console control event handler for non-browser processes that hangs the
// control thread. The event will be handled by the browser process.
BOOL WINAPI OtherConsoleControlHandler(DWORD control_type) {
// Block the control thread while waiting for the browser process.
base::PlatformThread::Sleep(base::Hours(1));
// This should never be hit. The process will be terminated by the browser
// process or by Windows, if the former takes too long.
return TRUE; // Handled.
}
void InstallConsoleControlHandler(bool is_browser_process) {
if (!::SetConsoleCtrlHandler(is_browser_process
? &BrowserConsoleControlHandler
: &OtherConsoleControlHandler,
/*Add=*/TRUE)) {
DPLOG(ERROR) << "Failed to set console hook function";
}
}
#endif // defined(OS_WIN)
bool ShouldAllowSystemTracingConsumer() {
// System tracing consumer support is currently only supported on ChromeOS.
// TODO(crbug.com/1173395): Also enable for Lacros-Chrome.
#if BUILDFLAG(IS_CHROMEOS_ASH) || BUILDFLAG(IS_CHROMEOS_LACROS)
// The consumer should only be enabled when the delegate allows it.
TracingDelegate* delegate =
GetContentClient()->browser()->GetTracingDelegate();
return delegate && delegate->IsSystemWideTracingEnabled();
#else // BUILDFLAG(IS_CHROMEOS_ASH)
return false;
#endif // BUILDFLAG(IS_CHROMEOS_ASH)
}
} // namespace
class ContentClientCreator {
public:
static void Create(ContentMainDelegate* delegate) {
ContentClient* client = delegate->CreateContentClient();
DCHECK(client);
SetContentClient(client);
}
};
class ContentClientInitializer {
public:
static void Set(const std::string& process_type,
ContentMainDelegate* delegate) {
ContentClient* content_client = GetContentClient();
if (process_type.empty())
content_client->browser_ = delegate->CreateContentBrowserClient();
base::CommandLine* cmd = base::CommandLine::ForCurrentProcess();
if (process_type == switches::kGpuProcess ||
cmd->HasSwitch(switches::kSingleProcess) ||
(process_type.empty() && cmd->HasSwitch(switches::kInProcessGPU)))
content_client->gpu_ = delegate->CreateContentGpuClient();
if (process_type == switches::kRendererProcess ||
cmd->HasSwitch(switches::kSingleProcess))
content_client->renderer_ = delegate->CreateContentRendererClient();
if (process_type == switches::kUtilityProcess ||
cmd->HasSwitch(switches::kSingleProcess))
content_client->utility_ = delegate->CreateContentUtilityClient();
}
};
// We dispatch to a process-type-specific FooMain() based on a command-line
// flag. This struct is used to build a table of (flag, main function) pairs.
struct MainFunction {
const char* name;
int (*function)(const MainFunctionParams&);
};
#if BUILDFLAG(USE_ZYGOTE_HANDLE)
// On platforms that use the zygote, we have a special subset of
// subprocesses that are launched via the zygote. This function
// fills in some process-launching bits around ZygoteMain().
// Returns the exit code of the subprocess.
// This function must be marked with NO_STACK_PROTECTOR or it may crash on
// return, see the --change-stack-guard-on-fork command line flag.
int NO_STACK_PROTECTOR RunZygote(ContentMainDelegate* delegate) {
static const MainFunction kMainFunctions[] = {
{switches::kGpuProcess, GpuMain},
{switches::kRendererProcess, RendererMain},
{switches::kUtilityProcess, UtilityMain},
#if BUILDFLAG(ENABLE_PLUGINS)
{switches::kPpapiPluginProcess, PpapiPluginMain},
#endif
};
std::vector<std::unique_ptr<ZygoteForkDelegate>> zygote_fork_delegates;
delegate->ZygoteStarting(&zygote_fork_delegates);
media::InitializeMediaLibrary();
#if defined(OS_LINUX) || defined(OS_CHROMEOS)
PreSandboxInit();
#endif
// This function call can return multiple times, once per fork().
if (!ZygoteMain(std::move(zygote_fork_delegates))) {
return 1;
}
// Zygote::HandleForkRequest may have reallocated the command
// line so update it here with the new version.
const base::CommandLine& command_line =
*base::CommandLine::ForCurrentProcess();
// Re-randomize our stack canary, so processes don't share a single
// stack canary.
base::ScopedClosureRunner stack_canary_debug_message;
if (command_line.GetSwitchValueASCII(switches::kChangeStackGuardOnFork) ==
switches::kChangeStackGuardOnForkEnabled) {
base::ResetStackCanaryIfPossible();
stack_canary_debug_message.ReplaceClosure(
base::BindOnce(&base::SetStackSmashingEmitsDebugMessage));
}
delegate->ZygoteForked();
std::string process_type =
command_line.GetSwitchValueASCII(switches::kProcessType);
internal::PartitionAllocSupport::Get()->ReconfigureAfterZygoteFork(
process_type);
ContentClientInitializer::Set(process_type, delegate);
MainFunctionParams main_params(command_line);
main_params.zygote_child = true;
InitializeFieldTrialAndFeatureList();
delegate->PostFieldTrialInitialization();
internal::PartitionAllocSupport::Get()->ReconfigureAfterFeatureListInit(
process_type);
mojo::core::InitFeatures();
for (size_t i = 0; i < base::size(kMainFunctions); ++i) {
if (process_type == kMainFunctions[i].name)
return kMainFunctions[i].function(main_params);
}
return delegate->RunProcess(process_type, main_params);
}
#endif // BUILDFLAG(USE_ZYGOTE_HANDLE)
static void RegisterMainThreadFactories() {
UtilityProcessHost::RegisterUtilityMainThreadFactory(
CreateInProcessUtilityThread);
RenderProcessHostImpl::RegisterRendererMainThreadFactory(
CreateInProcessRendererThread);
content::RegisterGpuMainThreadFactory(CreateInProcessGpuThread);
}
// Run the main function for browser process.
// Returns the exit code for this process.
int RunBrowserProcessMain(const MainFunctionParams& main_function_params,
ContentMainDelegate* delegate) {
#if defined(OS_WIN)
if (delegate->ShouldHandleConsoleControlEvents())
InstallConsoleControlHandler(/*is_browser_process=*/true);
#endif
int exit_code = delegate->RunProcess("", main_function_params);
if (exit_code >= 0)
return exit_code;
return BrowserMain(main_function_params);
}
// Run the FooMain() for a given process type.
// Returns the exit code for this process.
// This function must be marked with NO_STACK_PROTECTOR or it may crash on
// return, see the --change-stack-guard-on-fork command line flag.
int NO_STACK_PROTECTOR
RunOtherNamedProcessTypeMain(const std::string& process_type,
const MainFunctionParams& main_function_params,
ContentMainDelegate* delegate) {
#if defined(OS_WIN)
if (delegate->ShouldHandleConsoleControlEvents())
InstallConsoleControlHandler(/*is_browser_process=*/false);
#endif
static const MainFunction kMainFunctions[] = {
#if BUILDFLAG(ENABLE_PLUGINS)
{switches::kPpapiPluginProcess, PpapiPluginMain},
#endif // ENABLE_PLUGINS
{switches::kUtilityProcess, UtilityMain},
{switches::kRendererProcess, RendererMain},
{switches::kGpuProcess, GpuMain},
};
for (size_t i = 0; i < base::size(kMainFunctions); ++i) {
if (process_type == kMainFunctions[i].name) {
int exit_code = delegate->RunProcess(process_type, main_function_params);
if (exit_code >= 0)
return exit_code;
return kMainFunctions[i].function(main_function_params);
}
}
#if BUILDFLAG(USE_ZYGOTE_HANDLE)
// Zygote startup is special -- see RunZygote comments above
// for why we don't use ZygoteMain directly.
if (process_type == switches::kZygoteProcess)
return RunZygote(delegate);
#endif // BUILDFLAG(USE_ZYGOTE_HANDLE)
// If it's a process we don't know about, the embedder should know.
return delegate->RunProcess(process_type, main_function_params);
}
// static
std::unique_ptr<ContentMainRunnerImpl> ContentMainRunnerImpl::Create() {
return std::make_unique<ContentMainRunnerImpl>();
}
ContentMainRunnerImpl::ContentMainRunnerImpl() {
#if defined(OS_WIN)
memset(&sandbox_info_, 0, sizeof(sandbox_info_));
#endif
}
ContentMainRunnerImpl::~ContentMainRunnerImpl() {
if (is_initialized_ && !is_shutdown_)
Shutdown();
}
int ContentMainRunnerImpl::TerminateForFatalInitializationError() {
return delegate_->TerminateForFatalInitializationError();
}
int ContentMainRunnerImpl::Initialize(const ContentMainParams& params) {
ui_task_ = params.ui_task;
created_main_parts_closure_ = params.created_main_parts_closure;
#if defined(OS_WIN)
sandbox_info_ = *params.sandbox_info;
#else // !OS_WIN
#if defined(OS_MAC)
autorelease_pool_ = params.autorelease_pool;
#endif // defined(OS_MAC)
#if defined(OS_ANDROID)
// Now that mojo's core is initialized we can enable tracing. Note that only
// Android builds have the ctor/dtor handlers set up to use trace events at
// this point (because AtExitManager is already set up when the library is
// loaded). Other platforms enable tracing below, after the initialization of
// AtExitManager.
tracing::EnableStartupTracingIfNeeded();
TRACE_EVENT0("startup,benchmark,rail", "ContentMainRunnerImpl::Initialize");
#endif // OS_ANDROID
base::GlobalDescriptors* g_fds = base::GlobalDescriptors::GetInstance();
ALLOW_UNUSED_LOCAL(g_fds);
// On Android, the ipc_fd is passed through the Java service.
#if !defined(OS_ANDROID)
g_fds->Set(kMojoIPCChannel,
kMojoIPCChannel + base::GlobalDescriptors::kBaseDescriptor);
g_fds->Set(kFieldTrialDescriptor,
kFieldTrialDescriptor + base::GlobalDescriptors::kBaseDescriptor);
#endif // !OS_ANDROID
#if defined(OS_LINUX) || defined(OS_CHROMEOS) || defined(OS_OPENBSD)
g_fds->Set(kCrashDumpSignal,
kCrashDumpSignal + base::GlobalDescriptors::kBaseDescriptor);
#endif // defined(OS_LINUX) || defined(OS_CHROMEOS) || defined(OS_OPENBSD)
#endif // !OS_WIN
is_initialized_ = true;
delegate_ = params.delegate;
// The exit manager is in charge of calling the dtors of singleton objects.
// On Android, AtExitManager is set up when library is loaded.
// A consequence of this is that you can't use the ctor/dtor-based
// TRACE_EVENT methods on Linux or iOS builds till after we set this up.
#if !defined(OS_ANDROID)
if (!ui_task_) {
// When running browser tests, don't create a second AtExitManager as that
// interfers with shutdown when objects created before ContentMain is
// called are destructed when it returns.
exit_manager_ = std::make_unique<base::AtExitManager>();
}
#endif // !OS_ANDROID
int exit_code = 0;
if (!GetContentClient())
ContentClientCreator::Create(delegate_);
if (delegate_->BasicStartupComplete(&exit_code))
return exit_code;
completed_basic_startup_ = true;
const base::CommandLine& command_line =
*base::CommandLine::ForCurrentProcess();
std::string process_type =
command_line.GetSwitchValueASCII(switches::kProcessType);
internal::PartitionAllocSupport::Get()->ReconfigureEarlyish(process_type);
#if defined(OS_WIN)
if (command_line.HasSwitch(switches::kDeviceScaleFactor)) {
std::string scale_factor_string =
command_line.GetSwitchValueASCII(switches::kDeviceScaleFactor);
double scale_factor = 0;
if (base::StringToDouble(scale_factor_string, &scale_factor))
display::win::SetDefaultDeviceScaleFactor(scale_factor);
}
#endif
RegisterContentSchemes();
ContentClientInitializer::Set(process_type, delegate_);
#if !defined(OS_ANDROID)
// Enable startup tracing asap to avoid early TRACE_EVENT calls being
// ignored. For Android, startup tracing is enabled in an even earlier place
// above.
//
// Startup tracing flags are not (and should not be) passed to Zygote
// processes. We will enable tracing when forked, if needed.
bool enable_startup_tracing = process_type != switches::kZygoteProcess;
#if BUILDFLAG(USE_ZYGOTE_HANDLE)
// In the browser process, we have to enable startup tracing after
// InitializeZygoteSandboxForBrowserProcess() is run below, because that
// function forks and may call trace macros in the forked process.
if (process_type.empty())
enable_startup_tracing = false;
#endif // BUILDFLAG(USE_ZYGOTE_HANDLE)
if (enable_startup_tracing)
tracing::EnableStartupTracingIfNeeded();
#if defined(OS_WIN)
base::trace_event::TraceEventETWExport::EnableETWExport();
#endif // OS_WIN
// Android tracing started at the beginning of the method.
// Other OSes have to wait till we get here in order for all the memory
// management setup to be completed.
TRACE_EVENT0("startup,benchmark,rail", "ContentMainRunnerImpl::Initialize");
#endif // !OS_ANDROID
// If we are on a platform where the default allocator is overridden (shim
// layer on windows, tcmalloc on Linux Desktop) smoke-tests that the
// overriding logic is working correctly. If not causes a hard crash, as its
// unexpected absence has security implications.
CHECK(base::allocator::IsAllocatorInitialized());
#if defined(OS_POSIX) || defined(OS_FUCHSIA)
if (!process_type.empty()) {
// When you hit Ctrl-C in a terminal running the browser
// process, a SIGINT is delivered to the entire process group.
// When debugging the browser process via gdb, gdb catches the
// SIGINT for the browser process (and dumps you back to the gdb
// console) but doesn't for the child processes, killing them.
// The fix is to have child processes ignore SIGINT; they'll die
// on their own when the browser process goes away.
//
// Note that we *can't* rely on BeingDebugged to catch this case because
// we are the child process, which is not being debugged.
// TODO(evanm): move this to some shared subprocess-init function.
if (!base::debug::BeingDebugged())
signal(SIGINT, SIG_IGN);
}
#endif
RegisterPathProvider();
#if defined(OS_ANDROID) && (ICU_UTIL_DATA_IMPL == ICU_UTIL_DATA_FILE)
// On Android, we have two ICU data files. A main one with most languages
// that is expected to always be available and an extra one that is
// installed separately via a dynamic feature module. If the extra ICU data
// file is available we have to apply it _before_ the main ICU data file.
// Otherwise, the languages of the extra ICU file will be overridden.
if (process_type.empty()) {
TRACE_EVENT0("startup", "InitializeICU");
// In browser process load ICU data files from disk.
std::string split_name;
if (GetContentClient()->browser()->ShouldLoadExtraIcuDataFile(
&split_name)) {
if (!base::i18n::InitializeExtraICU(split_name)) {
return TerminateForFatalInitializationError();
}
}
if (!base::i18n::InitializeICU()) {
return TerminateForFatalInitializationError();
}
} else {
// In child process map ICU data files loaded by browser process.
int icu_extra_data_fd = g_fds->MaybeGet(kAndroidICUExtraDataDescriptor);
if (icu_extra_data_fd != -1) {
auto icu_extra_data_region =
g_fds->GetRegion(kAndroidICUExtraDataDescriptor);
if (!base::i18n::InitializeExtraICUWithFileDescriptor(
icu_extra_data_fd, icu_extra_data_region)) {
return TerminateForFatalInitializationError();
}
}
int icu_data_fd = g_fds->MaybeGet(kAndroidICUDataDescriptor);
if (icu_data_fd == -1) {
return TerminateForFatalInitializationError();
}
auto icu_data_region = g_fds->GetRegion(kAndroidICUDataDescriptor);
if (!base::i18n::InitializeICUWithFileDescriptor(icu_data_fd,
icu_data_region)) {
return TerminateForFatalInitializationError();
}
}
#else
if (!base::i18n::InitializeICU())
return TerminateForFatalInitializationError();
#endif // OS_ANDROID && (ICU_UTIL_DATA_IMPL == ICU_UTIL_DATA_FILE)
LoadV8SnapshotIfNeeded(command_line, process_type);
blink::TrialTokenValidator::SetOriginTrialPolicyGetter(
base::BindRepeating([]() -> blink::OriginTrialPolicy* {
if (auto* client = GetContentClient())
return client->GetOriginTrialPolicy();
return nullptr;
}));
#if !defined(OFFICIAL_BUILD)
#if defined(OS_WIN)
bool should_enable_stack_dump = !process_type.empty();
#else
bool should_enable_stack_dump = true;
#endif
// Print stack traces to stderr when crashes occur. This opens up security
// holes so it should never be enabled for official builds. This needs to
// happen before crash reporting is initialized (which for chrome happens in
// the call to PreSandboxStartup() on the delegate below), because otherwise
// this would interfere with signal handlers used by crash reporting.
if (should_enable_stack_dump &&
!command_line.HasSwitch(switches::kDisableInProcessStackTraces)) {
base::debug::EnableInProcessStackDumping();
}
base::debug::VerifyDebugger();
#endif // !defined(OFFICIAL_BUILD)
delegate_->PreSandboxStartup();
#if defined(OS_WIN)
if (!InitializeSandbox(
sandbox::policy::SandboxTypeFromCommandLine(command_line),
params.sandbox_info))
return TerminateForFatalInitializationError();
#elif defined(OS_MAC)
if (!sandbox::policy::IsUnsandboxedSandboxType(
sandbox::policy::SandboxTypeFromCommandLine(command_line))) {
// Verify that the sandbox was initialized prior to ContentMain using the
// SeatbeltExecServer.
CHECK(sandbox::Seatbelt::IsSandboxed());
}
#endif
delegate_->SandboxInitialized(process_type);
#if BUILDFLAG(USE_ZYGOTE_HANDLE)
if (process_type.empty()) {
// The sandbox host needs to be initialized before forking a thread to
// start IPC support, and after setting up the sandbox and invoking
// SandboxInitialized().
InitializeZygoteSandboxForBrowserProcess(
*base::CommandLine::ForCurrentProcess());
// We can only enable startup tracing after
// InitializeZygoteSandboxForBrowserProcess(), because the latter may fork
// and run code that calls trace event macros in the forked process (which
// could cause all sorts of issues, like writing to the same tracing SMB
// from two processes).
tracing::EnableStartupTracingIfNeeded();
}
#endif // BUILDFLAG(USE_ZYGOTE_HANDLE)
// Return -1 to indicate no early termination.
return -1;
}
// This function must be marked with NO_STACK_PROTECTOR or it may crash on
// return, see the --change-stack-guard-on-fork command line flag.
int NO_STACK_PROTECTOR ContentMainRunnerImpl::Run(bool start_minimal_browser) {
DCHECK(is_initialized_);
DCHECK(!is_shutdown_);
const base::CommandLine& command_line =
*base::CommandLine::ForCurrentProcess();
std::string process_type =
command_line.GetSwitchValueASCII(switches::kProcessType);
// Run this logic on all child processes.
if (!process_type.empty()) {
if (process_type != switches::kZygoteProcess) {
// Zygotes will run this at a later point in time when the command line
// has been updated.
InitializeFieldTrialAndFeatureList();
delegate_->PostFieldTrialInitialization();
internal::PartitionAllocSupport::Get()->ReconfigureAfterFeatureListInit(
process_type);
mojo::core::InitFeatures();
}
#if defined(OS_LINUX) || defined(OS_CHROMEOS)
// If dynamic Mojo Core is being used, ensure that it's loaded very early in
// the child/zygote process, before any sandbox is initialized. The library
// is not fully initialized with IPC support until a ChildProcess is later
// constructed, as initialization spawns a background thread which would be
// unsafe here.
if (IsMojoCoreSharedLibraryEnabled()) {
CHECK_EQ(mojo::LoadCoreLibrary(GetMojoCoreSharedLibraryPath()),
MOJO_RESULT_OK);
}
#endif // defined(OS_LINUX) || defined(OS_CHROMEOS)
}
MainFunctionParams main_params(command_line);
main_params.ui_task = ui_task_;
main_params.created_main_parts_closure = created_main_parts_closure_;
#if defined(OS_WIN)
main_params.sandbox_info = &sandbox_info_;
#elif defined(OS_MAC)
main_params.autorelease_pool = autorelease_pool_;
#endif