sandbox/linux/services/thread_helpers_unittests.cc

   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/memory/scoped_ptr.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
  32 int GetRaceTestIterations() {
  33   if (IsRunningOnValgrind()) {
  34     return 2;
  35   } else {
  36     return 1000;
  37   }
  38 }
  39
  40 class ScopedProc {
  41  public:
  42   ScopedProc() : fd_(-1) {
  43     fd_ = open("/proc/", O_RDONLY | O_DIRECTORY);
  44     CHECK_LE(0, fd_);
  45   }
  46
  47   ~ScopedProc() { PCHECK(0 == IGNORE_EINTR(close(fd_))); }
  48
  49   int fd() { return fd_; }
  50
  51  private:
  52   int fd_;
  53   DISALLOW_COPY_AND_ASSIGN(ScopedProc);
  54 };
  55
  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
  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
  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
  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
 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)
 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