691 lines
22 KiB
C++
691 lines
22 KiB
C++
// Copyright 2018 The Crashpad Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "client/crashpad_client.h"
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#include <dlfcn.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "base/check_op.h"
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#include "base/notreached.h"
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#include "build/build_config.h"
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#include "client/annotation.h"
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#include "client/annotation_list.h"
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#include "client/crash_report_database.h"
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#include "client/crashpad_info.h"
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#include "client/simulate_crash.h"
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#include "gtest/gtest.h"
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#include "snapshot/annotation_snapshot.h"
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#include "snapshot/minidump/process_snapshot_minidump.h"
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#include "snapshot/sanitized/sanitization_information.h"
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#include "test/errors.h"
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#include "test/multiprocess.h"
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#include "test/multiprocess_exec.h"
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#include "test/scoped_temp_dir.h"
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#include "test/test_paths.h"
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#include "util/file/file_io.h"
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#include "util/file/filesystem.h"
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#include "util/linux/exception_handler_client.h"
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#include "util/linux/exception_information.h"
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#include "util/linux/socket.h"
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#include "util/misc/address_sanitizer.h"
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#include "util/misc/address_types.h"
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#include "util/misc/from_pointer_cast.h"
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#include "util/misc/memory_sanitizer.h"
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#include "util/posix/scoped_mmap.h"
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#include "util/posix/signals.h"
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#include "util/thread/thread.h"
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#if BUILDFLAG(IS_ANDROID)
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#include <android/set_abort_message.h>
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#include "dlfcn_internal.h"
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// Normally this comes from set_abort_message.h, but only at API level 21.
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extern "C" void android_set_abort_message(const char* msg)
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__attribute__((weak));
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#endif
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namespace crashpad {
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namespace test {
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namespace {
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enum class CrashType : uint32_t {
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kSimulated,
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kBuiltinTrap,
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kInfiniteRecursion,
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};
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struct StartHandlerForSelfTestOptions {
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bool start_handler_at_crash;
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bool set_first_chance_handler;
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bool crash_non_main_thread;
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bool client_uses_signals;
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bool gather_indirectly_referenced_memory;
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CrashType crash_type;
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};
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class StartHandlerForSelfTest
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: public testing::TestWithParam<
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std::tuple<bool, bool, bool, bool, bool, CrashType>> {
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public:
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StartHandlerForSelfTest() = default;
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StartHandlerForSelfTest(const StartHandlerForSelfTest&) = delete;
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StartHandlerForSelfTest& operator=(const StartHandlerForSelfTest&) = delete;
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~StartHandlerForSelfTest() = default;
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void SetUp() override {
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// MSAN requires that padding bytes have been initialized for structs that
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// are written to files.
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memset(&options_, 0, sizeof(options_));
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std::tie(options_.start_handler_at_crash,
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options_.set_first_chance_handler,
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options_.crash_non_main_thread,
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options_.client_uses_signals,
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options_.gather_indirectly_referenced_memory,
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options_.crash_type) = GetParam();
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}
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const StartHandlerForSelfTestOptions& Options() const { return options_; }
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private:
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StartHandlerForSelfTestOptions options_;
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};
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bool InstallHandler(CrashpadClient* client,
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bool start_at_crash,
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const base::FilePath& handler_path,
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const base::FilePath& database_path,
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const std::vector<base::FilePath>& attachments) {
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return start_at_crash
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? client->StartHandlerAtCrash(handler_path,
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database_path,
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base::FilePath(),
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"",
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std::map<std::string, std::string>(),
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std::vector<std::string>(),
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attachments)
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: client->StartHandler(handler_path,
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database_path,
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base::FilePath(),
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"",
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std::map<std::string, std::string>(),
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std::vector<std::string>(),
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false,
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false,
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attachments);
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}
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constexpr char kTestAnnotationName[] = "name_of_annotation";
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constexpr char kTestAnnotationValue[] = "value_of_annotation";
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constexpr char kTestAttachmentName[] = "test_attachment";
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constexpr char kTestAttachmentContent[] = "attachment_content";
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#if BUILDFLAG(IS_ANDROID)
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constexpr char kTestAbortMessage[] = "test abort message";
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#endif
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void ValidateAttachment(const CrashReportDatabase::UploadReport* report) {
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auto attachments = report->GetAttachments();
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ASSERT_EQ(attachments.size(), 1u);
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char buf[sizeof(kTestAttachmentContent)];
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attachments.at(kTestAttachmentName)->Read(buf, sizeof(buf));
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ASSERT_EQ(memcmp(kTestAttachmentContent, buf, sizeof(kTestAttachmentContent)),
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0);
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}
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void ValidateExtraMemory(const StartHandlerForSelfTestOptions& options,
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const ProcessSnapshotMinidump& minidump) {
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// Verify that if we have an exception, then the code around the instruction
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// pointer is included in the extra memory.
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const ExceptionSnapshot* exception = minidump.Exception();
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if (exception == nullptr)
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return;
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uint64_t pc = exception->Context()->InstructionPointer();
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std::vector<const MemorySnapshot*> snippets = minidump.ExtraMemory();
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bool pc_found = false;
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for (const MemorySnapshot* snippet : snippets) {
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uint64_t start = snippet->Address();
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uint64_t end = start + snippet->Size();
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if (pc >= start && pc < end) {
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pc_found = true;
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break;
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}
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}
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EXPECT_EQ(pc_found, options.gather_indirectly_referenced_memory);
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}
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void ValidateDump(const StartHandlerForSelfTestOptions& options,
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const CrashReportDatabase::UploadReport* report) {
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ProcessSnapshotMinidump minidump_snapshot;
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ASSERT_TRUE(minidump_snapshot.Initialize(report->Reader()));
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#if BUILDFLAG(IS_ANDROID)
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// This part of the test requires Q. The API level on Q devices will be 28
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// until the API is finalized, so we can't check API level yet. For now, test
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// for the presence of a libc symbol which was introduced in Q.
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if (crashpad::internal::Dlsym(RTLD_DEFAULT, "android_fdsan_close_with_tag")) {
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const auto& annotations = minidump_snapshot.AnnotationsSimpleMap();
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auto abort_message = annotations.find("abort_message");
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ASSERT_NE(annotations.end(), abort_message);
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EXPECT_EQ(kTestAbortMessage, abort_message->second);
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}
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#endif
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ValidateAttachment(report);
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ValidateExtraMemory(options, minidump_snapshot);
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for (const ModuleSnapshot* module : minidump_snapshot.Modules()) {
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for (const AnnotationSnapshot& annotation : module->AnnotationObjects()) {
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if (static_cast<Annotation::Type>(annotation.type) !=
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Annotation::Type::kString) {
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continue;
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}
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if (annotation.name == kTestAnnotationName) {
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std::string value(
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reinterpret_cast<const char*>(annotation.value.data()),
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annotation.value.size());
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EXPECT_EQ(value, kTestAnnotationValue);
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return;
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}
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}
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}
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ADD_FAILURE();
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}
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Winfinite-recursion"
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int RecurseInfinitely(int* ptr) {
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int buf[1 << 20];
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return *ptr + RecurseInfinitely(buf);
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}
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#pragma clang diagnostic pop
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sigjmp_buf do_crash_sigjmp_env;
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bool HandleCrashSuccessfully(int, siginfo_t*, ucontext_t*) {
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siglongjmp(do_crash_sigjmp_env, 1);
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wunreachable-code-return"
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return true;
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#pragma clang diagnostic pop
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}
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void DoCrash(const StartHandlerForSelfTestOptions& options,
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CrashpadClient* client) {
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if (sigsetjmp(do_crash_sigjmp_env, 1) != 0) {
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return;
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}
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switch (options.crash_type) {
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case CrashType::kSimulated:
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CRASHPAD_SIMULATE_CRASH();
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break;
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case CrashType::kBuiltinTrap:
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__builtin_trap();
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case CrashType::kInfiniteRecursion:
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int val = 42;
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exit(RecurseInfinitely(&val));
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}
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}
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class ScopedAltSignalStack {
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public:
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ScopedAltSignalStack() = default;
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ScopedAltSignalStack(const ScopedAltSignalStack&) = delete;
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ScopedAltSignalStack& operator=(const ScopedAltSignalStack&) = delete;
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~ScopedAltSignalStack() {
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if (stack_mem_.is_valid()) {
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stack_t stack;
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stack.ss_flags = SS_DISABLE;
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if (sigaltstack(&stack, nullptr) != 0) {
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ADD_FAILURE() << ErrnoMessage("sigaltstack");
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}
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}
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}
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void Initialize() {
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ScopedMmap local_stack_mem;
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constexpr size_t stack_size = MINSIGSTKSZ;
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ASSERT_TRUE(local_stack_mem.ResetMmap(nullptr,
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stack_size,
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PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS,
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-1,
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0));
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stack_t stack;
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stack.ss_sp = local_stack_mem.addr();
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stack.ss_size = stack_size;
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stack.ss_flags = 0;
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ASSERT_EQ(sigaltstack(&stack, nullptr), 0) << ErrnoMessage("sigaltstack");
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stack_mem_.ResetAddrLen(local_stack_mem.release(), stack_size);
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}
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private:
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ScopedMmap stack_mem_;
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};
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class CrashThread : public Thread {
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public:
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CrashThread(const StartHandlerForSelfTestOptions& options,
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CrashpadClient* client)
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: client_signal_stack_(), options_(options), client_(client) {}
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CrashThread(const CrashThread&) = delete;
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CrashThread& operator=(const CrashThread&) = delete;
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private:
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void ThreadMain() override {
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// It is only necessary to call InitializeSignalStackForThread() once, but
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// should be harmless to call multiple times and durable against the client
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// using sigaltstack() either before or after it is called.
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CrashpadClient::InitializeSignalStackForThread();
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if (options_.client_uses_signals) {
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client_signal_stack_.Initialize();
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}
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CrashpadClient::InitializeSignalStackForThread();
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DoCrash(options_, client_);
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}
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ScopedAltSignalStack client_signal_stack_;
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const StartHandlerForSelfTestOptions& options_;
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CrashpadClient* client_;
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};
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CRASHPAD_CHILD_TEST_MAIN(StartHandlerForSelfTestChild) {
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FileHandle in = StdioFileHandle(StdioStream::kStandardInput);
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VMSize temp_dir_length;
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CheckedReadFileExactly(in, &temp_dir_length, sizeof(temp_dir_length));
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std::string temp_dir(temp_dir_length, '\0');
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CheckedReadFileExactly(in, &temp_dir[0], temp_dir_length);
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StartHandlerForSelfTestOptions options;
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CheckedReadFileExactly(in, &options, sizeof(options));
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ScopedAltSignalStack client_signal_stack;
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if (options.client_uses_signals) {
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client_signal_stack.Initialize();
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static Signals::OldActions old_actions;
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static Signals::Handler client_handler =
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[](int signo, siginfo_t* siginfo, void*) {
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FileHandle out = StdioFileHandle(StdioStream::kStandardOutput);
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char c = 0;
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WriteFile(out, &c, sizeof(c));
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Signals::RestoreHandlerAndReraiseSignalOnReturn(
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siginfo, old_actions.ActionForSignal(signo));
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};
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CHECK(Signals::InstallCrashHandlers(
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client_handler, SA_ONSTACK, &old_actions));
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}
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if (options.gather_indirectly_referenced_memory) {
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CrashpadInfo::GetCrashpadInfo()->set_gather_indirectly_referenced_memory(
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TriState::kEnabled, 1024 * 1024 * 4);
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}
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base::FilePath handler_path = TestPaths::Executable().DirName().Append(
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FILE_PATH_LITERAL("crashpad_handler"));
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crashpad::AnnotationList::Register();
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static StringAnnotation<32> test_annotation(kTestAnnotationName);
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test_annotation.Set(kTestAnnotationValue);
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const std::vector<base::FilePath> attachments = {
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base::FilePath(temp_dir).Append(kTestAttachmentName)};
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crashpad::CrashpadClient client;
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if (!InstallHandler(&client,
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options.start_handler_at_crash,
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handler_path,
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base::FilePath(temp_dir),
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attachments)) {
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return EXIT_FAILURE;
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}
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if (options.set_first_chance_handler) {
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client.SetFirstChanceExceptionHandler(HandleCrashSuccessfully);
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}
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#if BUILDFLAG(IS_ANDROID)
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if (android_set_abort_message) {
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android_set_abort_message(kTestAbortMessage);
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}
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#endif
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if (options.crash_non_main_thread) {
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CrashThread thread(options, &client);
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thread.Start();
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thread.Join();
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} else {
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DoCrash(options, &client);
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}
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return EXIT_SUCCESS;
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}
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class StartHandlerForSelfInChildTest : public MultiprocessExec {
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public:
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StartHandlerForSelfInChildTest(const StartHandlerForSelfTestOptions& options)
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: MultiprocessExec(), options_(options) {
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SetChildTestMainFunction("StartHandlerForSelfTestChild");
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if (!options.set_first_chance_handler) {
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switch (options.crash_type) {
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case CrashType::kSimulated:
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// kTerminationNormal, EXIT_SUCCESS
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break;
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case CrashType::kBuiltinTrap:
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SetExpectedChildTerminationBuiltinTrap();
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break;
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case CrashType::kInfiniteRecursion:
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SetExpectedChildTermination(TerminationReason::kTerminationSignal,
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SIGSEGV);
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break;
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}
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}
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}
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StartHandlerForSelfInChildTest(const StartHandlerForSelfInChildTest&) =
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delete;
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StartHandlerForSelfInChildTest& operator=(
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const StartHandlerForSelfInChildTest&) = delete;
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private:
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void MultiprocessParent() override {
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ScopedTempDir temp_dir;
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VMSize temp_dir_length = temp_dir.path().value().size();
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ASSERT_TRUE(LoggingWriteFile(
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WritePipeHandle(), &temp_dir_length, sizeof(temp_dir_length)));
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ASSERT_TRUE(LoggingWriteFile(
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WritePipeHandle(), temp_dir.path().value().data(), temp_dir_length));
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ASSERT_TRUE(
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LoggingWriteFile(WritePipeHandle(), &options_, sizeof(options_)));
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FileWriter writer;
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base::FilePath test_attachment_path =
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temp_dir.path().Append(kTestAttachmentName);
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bool is_created = writer.Open(test_attachment_path,
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FileWriteMode::kCreateOrFail,
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FilePermissions::kOwnerOnly);
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ASSERT_TRUE(is_created);
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writer.Write(kTestAttachmentContent, sizeof(kTestAttachmentContent));
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writer.Close();
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if (options_.client_uses_signals && !options_.set_first_chance_handler &&
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options_.crash_type != CrashType::kSimulated) {
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// Wait for child's client signal handler.
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char c;
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EXPECT_TRUE(LoggingReadFileExactly(ReadPipeHandle(), &c, sizeof(c)));
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}
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// Wait for child to finish.
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CheckedReadFileAtEOF(ReadPipeHandle());
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auto database = CrashReportDatabase::Initialize(temp_dir.path());
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ASSERT_TRUE(database);
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std::vector<CrashReportDatabase::Report> reports;
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ASSERT_EQ(database->GetCompletedReports(&reports),
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CrashReportDatabase::kNoError);
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EXPECT_EQ(reports.size(), 0u);
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reports.clear();
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ASSERT_EQ(database->GetPendingReports(&reports),
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CrashReportDatabase::kNoError);
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bool report_expected = !options_.set_first_chance_handler ||
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options_.crash_type == CrashType::kSimulated;
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ASSERT_EQ(reports.size(), report_expected ? 1u : 0u);
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if (!report_expected) {
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return;
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}
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std::unique_ptr<const CrashReportDatabase::UploadReport> report;
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ASSERT_EQ(database->GetReportForUploading(reports[0].uuid, &report),
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CrashReportDatabase::kNoError);
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ValidateDump(options_, report.get());
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}
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StartHandlerForSelfTestOptions options_;
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};
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TEST_P(StartHandlerForSelfTest, StartHandlerInChild) {
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#if defined(ADDRESS_SANITIZER) || defined(MEMORY_SANITIZER) || \
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defined(UNDEFINED_SANITIZER)
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if (Options().crash_type == CrashType::kInfiniteRecursion) {
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GTEST_SKIP();
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}
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#endif // defined(ADDRESS_SANITIZER)
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StartHandlerForSelfInChildTest test(Options());
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test.Run();
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}
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INSTANTIATE_TEST_SUITE_P(
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StartHandlerForSelfTestSuite,
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StartHandlerForSelfTest,
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testing::Combine(testing::Bool(),
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testing::Bool(),
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testing::Bool(),
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testing::Bool(),
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testing::Bool(),
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testing::Values(CrashType::kSimulated,
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CrashType::kBuiltinTrap,
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CrashType::kInfiniteRecursion)));
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// Test state for starting the handler for another process.
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class StartHandlerForClientTest {
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public:
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StartHandlerForClientTest() = default;
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StartHandlerForClientTest(const StartHandlerForClientTest&) = delete;
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StartHandlerForClientTest& operator=(const StartHandlerForClientTest&) =
|
|
delete;
|
|
|
|
~StartHandlerForClientTest() = default;
|
|
|
|
bool Initialize(bool sanitize) {
|
|
sanitize_ = sanitize;
|
|
return UnixCredentialSocket::CreateCredentialSocketpair(&client_sock_,
|
|
&server_sock_);
|
|
}
|
|
|
|
bool StartHandlerOnDemand() {
|
|
char c;
|
|
if (!LoggingReadFileExactly(server_sock_.get(), &c, sizeof(c))) {
|
|
ADD_FAILURE();
|
|
return false;
|
|
}
|
|
|
|
base::FilePath handler_path = TestPaths::Executable().DirName().Append(
|
|
FILE_PATH_LITERAL("crashpad_handler"));
|
|
|
|
CrashpadClient client;
|
|
if (!client.StartHandlerForClient(handler_path,
|
|
temp_dir_.path(),
|
|
base::FilePath(),
|
|
"",
|
|
std::map<std::string, std::string>(),
|
|
std::vector<std::string>(),
|
|
server_sock_.get())) {
|
|
ADD_FAILURE();
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
void ExpectReport() {
|
|
auto database =
|
|
CrashReportDatabase::InitializeWithoutCreating(temp_dir_.path());
|
|
ASSERT_TRUE(database);
|
|
|
|
std::vector<CrashReportDatabase::Report> reports;
|
|
ASSERT_EQ(database->GetCompletedReports(&reports),
|
|
CrashReportDatabase::kNoError);
|
|
EXPECT_EQ(reports.size(), 0u);
|
|
|
|
reports.clear();
|
|
ASSERT_EQ(database->GetPendingReports(&reports),
|
|
CrashReportDatabase::kNoError);
|
|
if (sanitize_) {
|
|
EXPECT_EQ(reports.size(), 0u);
|
|
} else {
|
|
EXPECT_EQ(reports.size(), 1u);
|
|
}
|
|
}
|
|
|
|
bool InstallHandler() {
|
|
auto signal_handler = SandboxedHandler::Get();
|
|
return signal_handler->Initialize(client_sock_.get(), sanitize_);
|
|
}
|
|
|
|
private:
|
|
// A signal handler that defers handler process startup to another, presumably
|
|
// more privileged, process.
|
|
class SandboxedHandler {
|
|
public:
|
|
SandboxedHandler(const SandboxedHandler&) = delete;
|
|
SandboxedHandler& operator=(const SandboxedHandler&) = delete;
|
|
|
|
static SandboxedHandler* Get() {
|
|
static SandboxedHandler* instance = new SandboxedHandler();
|
|
return instance;
|
|
}
|
|
|
|
bool Initialize(FileHandle client_sock, bool sanitize) {
|
|
client_sock_ = client_sock;
|
|
sanitize_ = sanitize;
|
|
return Signals::InstallCrashHandlers(HandleCrash, 0, nullptr);
|
|
}
|
|
|
|
private:
|
|
SandboxedHandler() = default;
|
|
~SandboxedHandler() = delete;
|
|
|
|
static void HandleCrash(int signo, siginfo_t* siginfo, void* context) {
|
|
auto state = Get();
|
|
|
|
char c = 0;
|
|
CHECK(LoggingWriteFile(state->client_sock_, &c, sizeof(c)));
|
|
|
|
ExceptionInformation exception_information;
|
|
exception_information.siginfo_address =
|
|
FromPointerCast<decltype(exception_information.siginfo_address)>(
|
|
siginfo);
|
|
exception_information.context_address =
|
|
FromPointerCast<decltype(exception_information.context_address)>(
|
|
context);
|
|
exception_information.thread_id = syscall(SYS_gettid);
|
|
|
|
ExceptionHandlerProtocol::ClientInformation info;
|
|
info.exception_information_address =
|
|
FromPointerCast<decltype(info.exception_information_address)>(
|
|
&exception_information);
|
|
|
|
SanitizationInformation sanitization_info = {};
|
|
if (state->sanitize_) {
|
|
info.sanitization_information_address =
|
|
FromPointerCast<VMAddress>(&sanitization_info);
|
|
// Target a non-module address to prevent a crash dump.
|
|
sanitization_info.target_module_address =
|
|
FromPointerCast<VMAddress>(&sanitization_info);
|
|
}
|
|
|
|
ExceptionHandlerClient handler_client(state->client_sock_, false);
|
|
CHECK_EQ(handler_client.RequestCrashDump(info), 0);
|
|
|
|
Signals::RestoreHandlerAndReraiseSignalOnReturn(siginfo, nullptr);
|
|
}
|
|
|
|
FileHandle client_sock_;
|
|
bool sanitize_;
|
|
};
|
|
|
|
ScopedTempDir temp_dir_;
|
|
ScopedFileHandle client_sock_;
|
|
ScopedFileHandle server_sock_;
|
|
bool sanitize_;
|
|
};
|
|
|
|
// Tests starting the handler for a child process.
|
|
class StartHandlerForChildTest : public Multiprocess {
|
|
public:
|
|
StartHandlerForChildTest() = default;
|
|
|
|
StartHandlerForChildTest(const StartHandlerForChildTest&) = delete;
|
|
StartHandlerForChildTest& operator=(const StartHandlerForChildTest&) = delete;
|
|
|
|
~StartHandlerForChildTest() = default;
|
|
|
|
bool Initialize(bool sanitize) {
|
|
SetExpectedChildTerminationBuiltinTrap();
|
|
return test_state_.Initialize(sanitize);
|
|
}
|
|
|
|
private:
|
|
void MultiprocessParent() {
|
|
ASSERT_TRUE(test_state_.StartHandlerOnDemand());
|
|
|
|
// Wait for chlid to finish.
|
|
CheckedReadFileAtEOF(ReadPipeHandle());
|
|
|
|
test_state_.ExpectReport();
|
|
}
|
|
|
|
void MultiprocessChild() {
|
|
CHECK(test_state_.InstallHandler());
|
|
|
|
__builtin_trap();
|
|
|
|
NOTREACHED();
|
|
}
|
|
|
|
StartHandlerForClientTest test_state_;
|
|
};
|
|
|
|
TEST(CrashpadClient, StartHandlerForChild) {
|
|
StartHandlerForChildTest test;
|
|
ASSERT_TRUE(test.Initialize(/* sanitize= */ false));
|
|
test.Run();
|
|
}
|
|
|
|
TEST(CrashpadClient, SanitizedChild) {
|
|
StartHandlerForChildTest test;
|
|
ASSERT_TRUE(test.Initialize(/* sanitize= */ true));
|
|
test.Run();
|
|
}
|
|
|
|
} // namespace
|
|
} // namespace test
|
|
} // namespace crashpad
|