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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "sandbox/linux/services/thread_helpers.h"
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "base/check_op.h"
#include "base/posix/eintr_wrapper.h"
#include "base/process/process_metrics.h"
#include "base/threading/platform_thread.h"
#include "base/threading/thread.h"
#include "build/build_config.h"
#include "sandbox/linux/tests/unit_tests.h"
#include "testing/gtest/include/gtest/gtest.h"
using base::PlatformThread;
namespace sandbox {
namespace {
// These tests fail under ThreadSanitizer, see http://crbug.com/342305
#if !defined(THREAD_SANITIZER)
const int kRaceTestIterations = 1000;
class ScopedProc {
public:
ScopedProc() : fd_(-1) {
fd_ = open("/proc/", O_RDONLY | O_DIRECTORY);
CHECK_LE(0, fd_);
}
ScopedProc(const ScopedProc&) = delete;
ScopedProc& operator=(const ScopedProc&) = delete;
~ScopedProc() { PCHECK(0 == IGNORE_EINTR(close(fd_))); }
int fd() { return fd_; }
private:
int fd_;
};
TEST(ThreadHelpers, IsSingleThreadedBasic) {
ScopedProc proc_fd;
ASSERT_TRUE(ThreadHelpers::IsSingleThreaded(proc_fd.fd()));
ASSERT_TRUE(ThreadHelpers::IsSingleThreaded());
base::Thread thread("sandbox_tests");
ASSERT_TRUE(ThreadHelpers::StartThreadAndWatchProcFS(proc_fd.fd(), &thread));
ASSERT_FALSE(ThreadHelpers::IsSingleThreaded(proc_fd.fd()));
ASSERT_FALSE(ThreadHelpers::IsSingleThreaded());
// Explicitly stop the thread here to not pollute the next test.
ASSERT_TRUE(ThreadHelpers::StopThreadAndWatchProcFS(proc_fd.fd(), &thread));
}
SANDBOX_TEST(ThreadHelpers, AssertSingleThreaded) {
ScopedProc proc_fd;
SANDBOX_ASSERT(ThreadHelpers::IsSingleThreaded(proc_fd.fd()));
SANDBOX_ASSERT(ThreadHelpers::IsSingleThreaded());
ThreadHelpers::AssertSingleThreaded(proc_fd.fd());
ThreadHelpers::AssertSingleThreaded();
}
TEST(ThreadHelpers, IsSingleThreadedIterated) {
ScopedProc proc_fd;
ASSERT_TRUE(ThreadHelpers::IsSingleThreaded(proc_fd.fd()));
// Iterate to check for race conditions.
for (int i = 0; i < kRaceTestIterations; ++i) {
base::Thread thread("sandbox_tests");
ASSERT_TRUE(
ThreadHelpers::StartThreadAndWatchProcFS(proc_fd.fd(), &thread));
ASSERT_FALSE(ThreadHelpers::IsSingleThreaded(proc_fd.fd()));
// Explicitly stop the thread here to not pollute the next test.
ASSERT_TRUE(ThreadHelpers::StopThreadAndWatchProcFS(proc_fd.fd(), &thread));
}
}
TEST(ThreadHelpers, IsSingleThreadedStartAndStop) {
ScopedProc proc_fd;
ASSERT_TRUE(ThreadHelpers::IsSingleThreaded(proc_fd.fd()));
base::Thread thread("sandbox_tests");
// This is testing for a race condition, so iterate.
// Manually, this has been tested with more that 1M iterations.
for (int i = 0; i < kRaceTestIterations; ++i) {
ASSERT_TRUE(
ThreadHelpers::StartThreadAndWatchProcFS(proc_fd.fd(), &thread));
ASSERT_FALSE(ThreadHelpers::IsSingleThreaded(proc_fd.fd()));
ASSERT_TRUE(ThreadHelpers::StopThreadAndWatchProcFS(proc_fd.fd(), &thread));
ASSERT_TRUE(ThreadHelpers::IsSingleThreaded(proc_fd.fd()));
ASSERT_EQ(1, base::GetNumberOfThreads(base::GetCurrentProcessHandle()));
}
}
SANDBOX_TEST(ThreadHelpers, AssertSingleThreadedAfterThreadStopped) {
ScopedProc proc_fd;
SANDBOX_ASSERT(ThreadHelpers::IsSingleThreaded());
base::Thread thread1("sandbox_tests");
base::Thread thread2("sandbox_tests");
for (int i = 0; i < kRaceTestIterations; ++i) {
SANDBOX_ASSERT(
ThreadHelpers::StartThreadAndWatchProcFS(proc_fd.fd(), &thread1));
SANDBOX_ASSERT(
ThreadHelpers::StartThreadAndWatchProcFS(proc_fd.fd(), &thread2));
SANDBOX_ASSERT(!ThreadHelpers::IsSingleThreaded());
thread1.Stop();
thread2.Stop();
// This will wait on /proc/ to reflect the state of threads in the
// process.
ThreadHelpers::AssertSingleThreaded();
SANDBOX_ASSERT(ThreadHelpers::IsSingleThreaded());
}
}
// Only run this test in Debug mode, where AssertSingleThreaded() will return
// in less than 64ms.
#if !defined(NDEBUG)
SANDBOX_DEATH_TEST(
ThreadHelpers,
AssertSingleThreadedDies,
DEATH_MESSAGE(
ThreadHelpers::GetAssertSingleThreadedErrorMessageForTests())) {
base::Thread thread1("sandbox_tests");
SANDBOX_ASSERT(thread1.Start());
ThreadHelpers::AssertSingleThreaded();
}
#endif // !defined(NDEBUG)
#endif // !defined(THREAD_SANITIZER)
} // namespace
} // namespace sandbox
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