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// Copyright 2017 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 "components/crash/content/app/fallback_crash_handler_launcher_win.h"
#include <dbghelp.h>
#include "base/base_switches.h"
#include "base/command_line.h"
#include "base/files/file.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/files/scoped_temp_dir.h"
#include "base/macros.h"
#include "base/process/process.h"
#include "base/process/process_handle.h"
#include "base/strings/string_number_conversions.h"
#include "base/test/multiprocess_test.h"
#include "base/win/win_util.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "testing/multiprocess_func_list.h"
namespace crash_reporter {
namespace {
const wchar_t kFileName[] = L"crash.dmp";
// This function is called in the fallback handler process instance.
MULTIPROCESS_TEST_MAIN(FallbackCrashHandlerLauncherMain) {
base::CommandLine* cmd_line = base::CommandLine::ForCurrentProcess();
// Check for presence of the "process" argument.
CHECK(cmd_line->HasSwitch("process"));
// Retrieve and check the handle to verify that it was inherited in.
unsigned int uint_process = 0;
CHECK(base::StringToUint(cmd_line->GetSwitchValueASCII("process"),
&uint_process));
base::Process process(base::win::Uint32ToHandle(uint_process));
// Verify that the process handle points to our parent.
CHECK_EQ(base::GetParentProcessId(base::GetCurrentProcessHandle()),
process.Pid());
// Check the "thread" argument.
CHECK(cmd_line->HasSwitch("thread"));
// Retrieve the thread id.
unsigned int thread_id = 0;
CHECK(
base::StringToUint(cmd_line->GetSwitchValueASCII("thread"), &thread_id));
// Check the "exception-pointers" argument.
CHECK(cmd_line->HasSwitch("exception-pointers"));
uint64_t uint_exc_ptrs = 0;
CHECK(base::StringToUint64(
cmd_line->GetSwitchValueASCII("exception-pointers"), &uint_exc_ptrs));
EXCEPTION_POINTERS* exc_ptrs = reinterpret_cast<EXCEPTION_POINTERS*>(
static_cast<uintptr_t>(uint_exc_ptrs));
// Check the "database" argument.
CHECK(cmd_line->HasSwitch("database"));
base::FilePath database_dir = cmd_line->GetSwitchValuePath("database");
base::FilePath dump_path = database_dir.Append(kFileName);
// Create a dump file in the directory.
base::File dump(dump_path, base::File::FLAG_CREATE | base::File::FLAG_WRITE);
CHECK(dump.IsValid());
const MINIDUMP_TYPE kMinidumpType = static_cast<MINIDUMP_TYPE>(
MiniDumpWithHandleData | MiniDumpWithUnloadedModules |
MiniDumpWithProcessThreadData | MiniDumpWithThreadInfo |
MiniDumpWithTokenInformation);
MINIDUMP_EXCEPTION_INFORMATION exc_info = {};
exc_info.ThreadId = thread_id;
exc_info.ExceptionPointers = exc_ptrs;
exc_info.ClientPointers = TRUE; // ExceptionPointers in client.
// Write the minidump as a direct test of the validity and permissions on the
// parent process handle.
if (!MiniDumpWriteDump(process.Handle(), // Process handle.
process.Pid(), // Process Id.
dump.GetPlatformFile(), // File handle.
kMinidumpType, // Minidump type.
&exc_info, // Exception Param
nullptr, // UserStreamParam,
nullptr)) { // CallbackParam
DWORD error = GetLastError();
dump.Close();
CHECK(base::DeleteFile(dump_path, false));
CHECK(false) << "Unable to write dump, error " << error;
}
return 0;
}
MULTIPROCESS_TEST_MAIN(TestCrashHandlerLauncherMain) {
base::ScopedTempDir database_dir;
CHECK(database_dir.CreateUniqueTempDir());
// Construct the base command line that diverts to the main function above.
base::CommandLine base_cmdline(
base::GetMultiProcessTestChildBaseCommandLine());
base_cmdline.AppendSwitchASCII(switches::kTestChildProcess,
"FallbackCrashHandlerLauncherMain");
FallbackCrashHandlerLauncher launcher;
CHECK(launcher.Initialize(base_cmdline, database_dir.GetPath()));
// Make like an access violation at the current place.
EXCEPTION_RECORD exc_record = {};
exc_record.ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
CONTEXT ctx = {};
RtlCaptureContext(&ctx);
CHECK_NE(0UL, ctx.ContextFlags);
EXCEPTION_POINTERS exc_ptrs = {&exc_record, &ctx};
CHECK_EQ(0UL, launcher.LaunchAndWaitForHandler(&exc_ptrs));
// Check that the dump was written, e.g. it's an existing file with non-zero
// size.
base::File dump(database_dir.GetPath().Append(kFileName),
base::File::FLAG_OPEN | base::File::FLAG_READ);
CHECK(dump.IsValid());
CHECK_NE(0, dump.GetLength());
return 0;
}
class FallbackCrashHandlerLauncherTest : public base::MultiProcessTest {};
} // namespace
TEST_F(FallbackCrashHandlerLauncherTest, LaunchAndWaitForHandler) {
// Because this process is heavily multithreaded it's going to be flaky
// and generally fraught with peril to try and grab a minidump of it.
// Instead, fire off a sacrificial process to do the testing.
base::Process test_process = SpawnChild("TestCrashHandlerLauncherMain");
int exit_code = 0;
ASSERT_TRUE(test_process.WaitForExit(&exit_code));
ASSERT_EQ(0, exit_code);
}
} // namespace crash_reporter
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