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
base / metrics / histogram_shared_memory_unittest.cc [blame]
// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/metrics/histogram_shared_memory.h"
#include "base/base_switches.h"
#include "base/command_line.h"
#include "base/metrics/persistent_histogram_allocator.h"
#include "base/process/launch.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/test/multiprocess_test.h"
#include "base/test/scoped_feature_list.h"
#include "base/test/test_timeouts.h"
#include "base/unguessable_token.h"
#include "build/build_config.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "testing/multiprocess_func_list.h"
#if BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA)
#include "base/files/platform_file.h"
#include "base/posix/global_descriptors.h"
#endif
namespace base {
namespace {
constexpr size_t kArbitrarySize = 64 << 10;
#if BUILDFLAG(IS_POSIX) && !BUILDFLAG(IS_APPLE)
constexpr GlobalDescriptors::Key kArbitraryDescriptorKey = 42;
#endif
} // namespace
TEST(HistogramSharedMemoryTest, Create) {
UnsafeSharedMemoryRegion region;
constexpr int kProcessId = 1234;
constexpr int kProcessType = 5678;
constexpr char kProcessName[] = "TestProcess";
auto shared_memory = HistogramSharedMemory::Create(
kProcessId, {kProcessType, kProcessName, kArbitrarySize});
ASSERT_TRUE(shared_memory.has_value());
ASSERT_TRUE(shared_memory->region.IsValid());
EXPECT_EQ(kArbitrarySize, shared_memory->region.GetSize());
ASSERT_TRUE(shared_memory->allocator);
EXPECT_EQ(kArbitrarySize, shared_memory->allocator->size());
}
TEST(HistogramSharedMemoryTest, PassSharedMemoryRegion_Disabled) {
// Ensure the feature is disabled.
test::ScopedFeatureList feature_list;
feature_list.InitAndDisableFeature(kPassHistogramSharedMemoryOnLaunch);
// Create a shared memory region to pass.
auto memory = UnsafeSharedMemoryRegion::Create(kArbitrarySize);
ASSERT_TRUE(memory.IsValid());
// Initialize the command line and launch options.
CommandLine command_line = GetMultiProcessTestChildBaseCommandLine();
command_line.AppendSwitchASCII("type", "test-child");
LaunchOptions launch_options;
#if BUILDFLAG(IS_POSIX) && !BUILDFLAG(IS_APPLE)
ScopedFD descriptor_to_share;
#endif
// Update the launch parameters.
HistogramSharedMemory::AddToLaunchParameters(memory.Duplicate(),
#if BUILDFLAG(IS_POSIX) && !BUILDFLAG(IS_APPLE)
kArbitraryDescriptorKey,
descriptor_to_share,
#endif // BUILDFLAG(IS_POSIX)
&command_line, &launch_options);
// The metrics shared memory handle should NOT be added to the command line.
EXPECT_FALSE(command_line.HasSwitch(switches::kMetricsSharedMemoryHandle));
}
MULTIPROCESS_TEST_MAIN(InitFromLaunchParameters) {
// On POSIX we generally use the descriptor map to look up inherited handles.
// On most POSIX platforms we have to manually sure the mapping is updated,
// for the purposes of this test.
//
// Note:
// - This doesn't apply on Apple platforms (which use Rendezvous Keys)
// - On Android the global descriptor table is managed by the launcher
// service, so we don't have to manually update the mapping here.
#if BUILDFLAG(IS_POSIX) && !BUILDFLAG(IS_APPLE) && !BUILDFLAG(IS_ANDROID)
GlobalDescriptors::GetInstance()->Set(
kArbitraryDescriptorKey,
kArbitraryDescriptorKey + GlobalDescriptors::kBaseDescriptor);
#endif
EXPECT_FALSE(GlobalHistogramAllocator::Get());
// Simulate launching with the serialized parameters.
HistogramSharedMemory::InitFromLaunchParameters(
*CommandLine::ForCurrentProcess());
EXPECT_TRUE(GlobalHistogramAllocator::Get());
return 0;
}
#if !BUILDFLAG(IS_IOS)
using HistogramSharedMemoryTest = ::testing::TestWithParam<bool>;
INSTANTIATE_TEST_SUITE_P(All,
HistogramSharedMemoryTest,
::testing::Values(/*launch_options.elevated=*/false
#if BUILDFLAG(IS_WIN)
,
/*launch_options.elevated=*/true
#endif
));
TEST_P(HistogramSharedMemoryTest, PassSharedMemoryRegion_Enabled) {
// Ensure the feature is enabled.
test::ScopedFeatureList feature_list;
feature_list.InitAndEnableFeature(kPassHistogramSharedMemoryOnLaunch);
// Create a shared memory region to pass.
auto memory = UnsafeSharedMemoryRegion::Create(kArbitrarySize);
ASSERT_TRUE(memory.IsValid());
// Initialize the command line and launch options.
CommandLine command_line = GetMultiProcessTestChildBaseCommandLine();
command_line.AppendSwitchASCII("type", "test-child");
LaunchOptions launch_options;
// On windows, check both the elevated and non-elevated launches.
#if BUILDFLAG(IS_WIN)
launch_options.start_hidden = true;
launch_options.elevated = GetParam();
#elif BUILDFLAG(IS_POSIX) && !BUILDFLAG(IS_APPLE)
ScopedFD descriptor_to_share;
#endif
// Update the launch parameters.
HistogramSharedMemory::AddToLaunchParameters(memory.Duplicate(),
#if BUILDFLAG(IS_POSIX) && !BUILDFLAG(IS_APPLE)
kArbitraryDescriptorKey,
descriptor_to_share,
#endif
&command_line, &launch_options);
// The metrics shared memory handle should be added to the command line.
ASSERT_TRUE(command_line.HasSwitch(switches::kMetricsSharedMemoryHandle));
SCOPED_TRACE(
command_line.GetSwitchValueASCII(switches::kMetricsSharedMemoryHandle));
#if BUILDFLAG(IS_POSIX) && !BUILDFLAG(IS_APPLE)
// On posix, AddToLaunchParameters() ignores the launch options and instead
// returns the descriptor to be shared. This is because the browser child
// launcher helper manages a separate list of files to share via the zygote,
// if available. If, like in this test scenario, there's ultimately no zygote
// to use, launch helper updates the launch options to share the descriptor
// mapping relative to a base descriptor.
launch_options.fds_to_remap.emplace_back(descriptor_to_share.get(),
kArbitraryDescriptorKey);
// GlobalDescriptors::GetInstance()->Set(kArbitraryDescriptorKey,
// descriptor_to_share);
#if !BUILDFLAG(IS_ANDROID)
for (auto& pair : launch_options.fds_to_remap) {
pair.second += base::GlobalDescriptors::kBaseDescriptor;
}
#endif // !BUILDFLAG(IS_ANDROID)
#endif // BUILDFLAG(IS_POSIX) && !BUILDFLAG(IS_APPLE)
// Launch the child process.
Process process = SpawnMultiProcessTestChild("InitFromLaunchParameters",
command_line, launch_options);
// The child process returns non-zero if it could not open the shared memory
// region based on the launch parameters.
int exit_code;
EXPECT_TRUE(WaitForMultiprocessTestChildExit(
process, TestTimeouts::action_timeout(), &exit_code));
EXPECT_EQ(0, exit_code);
}
#endif
} // namespace base