1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "sandbox/linux/services/thread_helpers.h"
6
7 #include <errno.h>
8 #include <fcntl.h>
9 #include <sys/stat.h>
10 #include <sys/types.h>
11 #include <unistd.h>
12
13 #include "base/logging.h"
14 #include "base/macros.h"
15 #include "base/posix/eintr_wrapper.h"
16 #include "base/process/process_metrics.h"
17 #include "base/threading/platform_thread.h"
18 #include "base/threading/thread.h"
19 #include "build/build_config.h"
20 #include "sandbox/linux/tests/unit_tests.h"
21 #include "testing/gtest/include/gtest/gtest.h"
22
23 using base::PlatformThread;
24
25 namespace sandbox {
26
27 namespace {
28
29 // These tests fail under ThreadSanitizer, see http://crbug.com/342305
30 #if !defined(THREAD_SANITIZER)
31
GetRaceTestIterations()32 int GetRaceTestIterations() {
33 if (IsRunningOnValgrind()) {
34 return 2;
35 } else {
36 return 1000;
37 }
38 }
39
40 class ScopedProc {
41 public:
ScopedProc()42 ScopedProc() : fd_(-1) {
43 fd_ = open("/proc/", O_RDONLY | O_DIRECTORY);
44 CHECK_LE(0, fd_);
45 }
46
~ScopedProc()47 ~ScopedProc() { PCHECK(0 == IGNORE_EINTR(close(fd_))); }
48
fd()49 int fd() { return fd_; }
50
51 private:
52 int fd_;
53 DISALLOW_COPY_AND_ASSIGN(ScopedProc);
54 };
55
TEST(ThreadHelpers,IsSingleThreadedBasic)56 TEST(ThreadHelpers, IsSingleThreadedBasic) {
57 ScopedProc proc_fd;
58 ASSERT_TRUE(ThreadHelpers::IsSingleThreaded(proc_fd.fd()));
59 ASSERT_TRUE(ThreadHelpers::IsSingleThreaded());
60
61 base::Thread thread("sandbox_tests");
62 ASSERT_TRUE(ThreadHelpers::StartThreadAndWatchProcFS(proc_fd.fd(), &thread));
63 ASSERT_FALSE(ThreadHelpers::IsSingleThreaded(proc_fd.fd()));
64 ASSERT_FALSE(ThreadHelpers::IsSingleThreaded());
65 // Explicitly stop the thread here to not pollute the next test.
66 ASSERT_TRUE(ThreadHelpers::StopThreadAndWatchProcFS(proc_fd.fd(), &thread));
67 }
68
SANDBOX_TEST(ThreadHelpers,AssertSingleThreaded)69 SANDBOX_TEST(ThreadHelpers, AssertSingleThreaded) {
70 ScopedProc proc_fd;
71 SANDBOX_ASSERT(ThreadHelpers::IsSingleThreaded(proc_fd.fd()));
72 SANDBOX_ASSERT(ThreadHelpers::IsSingleThreaded());
73
74 ThreadHelpers::AssertSingleThreaded(proc_fd.fd());
75 ThreadHelpers::AssertSingleThreaded();
76 }
77
TEST(ThreadHelpers,IsSingleThreadedIterated)78 TEST(ThreadHelpers, IsSingleThreadedIterated) {
79 ScopedProc proc_fd;
80 ASSERT_TRUE(ThreadHelpers::IsSingleThreaded(proc_fd.fd()));
81
82 // Iterate to check for race conditions.
83 for (int i = 0; i < GetRaceTestIterations(); ++i) {
84 base::Thread thread("sandbox_tests");
85 ASSERT_TRUE(
86 ThreadHelpers::StartThreadAndWatchProcFS(proc_fd.fd(), &thread));
87 ASSERT_FALSE(ThreadHelpers::IsSingleThreaded(proc_fd.fd()));
88 // Explicitly stop the thread here to not pollute the next test.
89 ASSERT_TRUE(ThreadHelpers::StopThreadAndWatchProcFS(proc_fd.fd(), &thread));
90 }
91 }
92
TEST(ThreadHelpers,IsSingleThreadedStartAndStop)93 TEST(ThreadHelpers, IsSingleThreadedStartAndStop) {
94 ScopedProc proc_fd;
95 ASSERT_TRUE(ThreadHelpers::IsSingleThreaded(proc_fd.fd()));
96
97 base::Thread thread("sandbox_tests");
98 // This is testing for a race condition, so iterate.
99 // Manually, this has been tested with more that 1M iterations.
100 for (int i = 0; i < GetRaceTestIterations(); ++i) {
101 ASSERT_TRUE(
102 ThreadHelpers::StartThreadAndWatchProcFS(proc_fd.fd(), &thread));
103 ASSERT_FALSE(ThreadHelpers::IsSingleThreaded(proc_fd.fd()));
104
105 ASSERT_TRUE(ThreadHelpers::StopThreadAndWatchProcFS(proc_fd.fd(), &thread));
106 ASSERT_TRUE(ThreadHelpers::IsSingleThreaded(proc_fd.fd()));
107 ASSERT_EQ(1, base::GetNumberOfThreads(base::GetCurrentProcessHandle()));
108 }
109 }
110
SANDBOX_TEST(ThreadHelpers,AssertSingleThreadedAfterThreadStopped)111 SANDBOX_TEST(ThreadHelpers, AssertSingleThreadedAfterThreadStopped) {
112 ScopedProc proc_fd;
113 SANDBOX_ASSERT(ThreadHelpers::IsSingleThreaded());
114
115 base::Thread thread1("sandbox_tests");
116 base::Thread thread2("sandbox_tests");
117
118 for (int i = 0; i < GetRaceTestIterations(); ++i) {
119 SANDBOX_ASSERT(
120 ThreadHelpers::StartThreadAndWatchProcFS(proc_fd.fd(), &thread1));
121 SANDBOX_ASSERT(
122 ThreadHelpers::StartThreadAndWatchProcFS(proc_fd.fd(), &thread2));
123 SANDBOX_ASSERT(!ThreadHelpers::IsSingleThreaded());
124
125 thread1.Stop();
126 thread2.Stop();
127 // This will wait on /proc/ to reflect the state of threads in the
128 // process.
129 ThreadHelpers::AssertSingleThreaded();
130 SANDBOX_ASSERT(ThreadHelpers::IsSingleThreaded());
131 }
132 }
133
134 // Only run this test in Debug mode, where AssertSingleThreaded() will return
135 // in less than 64ms.
136 #if !defined(NDEBUG)
SANDBOX_DEATH_TEST(ThreadHelpers,AssertSingleThreadedDies,DEATH_MESSAGE (ThreadHelpers::GetAssertSingleThreadedErrorMessageForTests ()))137 SANDBOX_DEATH_TEST(
138 ThreadHelpers,
139 AssertSingleThreadedDies,
140 DEATH_MESSAGE(
141 ThreadHelpers::GetAssertSingleThreadedErrorMessageForTests())) {
142 base::Thread thread1("sandbox_tests");
143 SANDBOX_ASSERT(thread1.Start());
144 ThreadHelpers::AssertSingleThreaded();
145 }
146 #endif // !defined(NDEBUG)
147
148 #endif // !defined(THREAD_SANITIZER)
149
150 } // namespace
151
152 } // namespace sandbox
153