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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/crash/core/app/crashpad.h"
#include <pthread.h>
#include <sys/prctl.h>
#include <limits>
#include "base/base_switches.h"
#include "base/command_line.h"
#include "base/linux_util.h"
#include "base/logging.h"
#include "base/path_service.h"
#include "base/posix/global_descriptors.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/stringprintf.h"
#include "base/system/sys_info.h"
#include "build/branding_buildflags.h"
#include "build/chromeos_buildflags.h"
#include "components/crash/core/app/crash_reporter_client.h"
#include "components/crash/core/app/crash_switches.h"
#include "content/public/common/content_descriptors.h"
#include "sandbox/linux/services/namespace_sandbox.h"
#include "third_party/crashpad/crashpad/client/crashpad_client.h"
#include "third_party/crashpad/crashpad/client/crashpad_info.h"
#if BUILDFLAG(IS_CHROMEOS_DEVICE)
#include <sys/types.h>
#include <unistd.h>
#include <utility>
#include "base/at_exit.h"
#include "base/files/file.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "third_party/cros_system_api/constants/crash_reporter.h"
#endif
namespace crash_reporter {
namespace {
// TODO(jperaza): This is the first chance handler type used by Breakpad and v8.
// The Crashpad FirstChanceHandler type explicitly declares the third parameter
// to be a ucontext_t* instead of a void*. Using a reinterpret cast to convert
// one function type to another causes calling the handler to fail with SIGILL
// when CFI is enabled. Use a helper with Crashpad's FirstChanceHandler type
// to delegate to the real first chance handler instead of re-interpreting the
// handler itself. This can be removed if the two function types converge.
bool (*g_first_chance_handler)(int, siginfo_t*, void*);
bool FirstChanceHandlerHelper(int signo,
siginfo_t* siginfo,
ucontext_t* context) {
return g_first_chance_handler(signo, siginfo, context);
}
#if BUILDFLAG(IS_CHROMEOS_DEVICE)
// Returns /run/crash_reporter/crashpad_ready/<pid>, the file we touch to
// tell crash_reporter that crashpad is ready and it doesn't need to use
// early-crash mode.
base::FilePath GetCrashpadReadyFilename() {
pid_t pid = getpid();
base::FilePath path(crash_reporter::kCrashpadReadyDirectory);
return path.Append(base::NumberToString(pid));
}
// Inform crash_reporter than crashpad is ready to handle crashes by
// touching /run/crash_reporter/crashpad_ready/<pid>.
//
// Before this point, crash_reporter will attempt to handle Chrome crashes
// sent to it by the kernel core_pattern. This gives us a chance to catch
// crashes that happen before crashpad initializes. See code around
// UserCollector::handling_early_chrome_crash_ for details. Once the
// /run/crash_reporter/crashpad_ready/<pid> file exists, however,
// crash_reporter's UserCollector will assume crashpad will deal with the
// crash and can early-return.
//
// We only need this for the browser process; the cores are too large for
// other processes so early crash doesn't attempt to handle them.
void InformCrashReporterThatCrashpadIsReady() {
base::FilePath path = GetCrashpadReadyFilename();
// Note: Using a base::File with FLAG_CREATE instead of WriteFile() to
// avoid symbolic link shenanigans.
base::File file(path, base::File::FLAG_CREATE | base::File::FLAG_WRITE);
if (!file.IsValid()) {
LOG(ERROR) << "Could not create " << path << ": "
<< base::File::ErrorToString(file.error_details());
}
// Remove file when the program exits. This isn't perfect; if the program
// crashes, and if the next browser process comes up with the same PID
// (without an intervening reboot), and that browser process crashes before
// crashpad initializes, then the crash service won't get the crash report.
// This is unlikely enough that I think we can risk it, especially since
// losing a single crash report is not a huge deal.
base::AtExitManager::RegisterTask(base::BindOnce(&DeleteCrashpadIsReadyFile));
}
#endif // BUILDFLAG(IS_CHROMEOS_DEVICE)
} // namespace
void SetFirstChanceExceptionHandler(bool (*handler)(int, siginfo_t*, void*)) {
DCHECK(!g_first_chance_handler);
g_first_chance_handler = handler;
crashpad::CrashpadClient::SetFirstChanceExceptionHandler(
FirstChanceHandlerHelper);
}
bool GetHandlerSocket(int* fd, pid_t* pid) {
return crashpad::CrashpadClient::GetHandlerSocket(fd, pid);
}
#if BUILDFLAG(IS_CHROMEOS_DEVICE)
void DeleteCrashpadIsReadyFile() {
// Attempt delete but do not log errors if the delete fails. The file might
// not exist if this function is called twice, or if Chrome did a fork-
// without-exec and this function is not in the same process that called
// InformCrashReporterThatCrashpadIsReady().
base::DeleteFile(GetCrashpadReadyFilename());
}
#endif // BUILDFLAG(IS_CHROMEOS_DEVICE)
namespace internal {
bool PlatformCrashpadInitialization(
bool initial_client,
bool browser_process,
bool embedded_handler,
const std::string& user_data_dir,
const base::FilePath& exe_path,
const std::vector<std::string>& initial_arguments,
base::FilePath* database_path) {
DCHECK_EQ(initial_client, browser_process);
DCHECK(initial_arguments.empty());
// Not used on Linux.
DCHECK(!embedded_handler);
DCHECK(exe_path.empty());
crashpad::CrashpadClient client;
#if BUILDFLAG(IS_CHROMEOS)
std::string crash_loop_before =
base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
switches::kCrashLoopBefore);
if (!crash_loop_before.empty()) {
uint64_t crash_loop_before_time;
if (!base::StringToUint64(crash_loop_before, &crash_loop_before_time)) {
LOG(ERROR) << "Couldn't parse --crash-loop-before=" << crash_loop_before;
DCHECK(false);
crash_loop_before_time = std::numeric_limits<uint64_t>::max();
}
client.SetCrashLoopBefore(crash_loop_before_time);
}
#endif
CrashReporterClient* crash_reporter_client = GetCrashReporterClient();
if (initial_client) {
base::FilePath metrics_path;
crash_reporter_client->GetCrashDumpLocation(database_path);
crash_reporter_client->GetCrashMetricsLocation(&metrics_path);
base::FilePath handler_path;
if (!base::PathService::Get(base::DIR_EXE, &handler_path)) {
return false;
}
handler_path = handler_path.Append("chrome_crashpad_handler");
// When --use-cros-crash-reporter is set (below), the handler passes dumps
// to ChromeOS's /sbin/crash_reporter which in turn passes the dump to
// crash_sender which handles the upload.
std::string url;
#if !BUILDFLAG(IS_CHROMEOS_DEVICE)
url = crash_reporter_client->GetUploadUrl();
#else
url = std::string();
#endif
ProductInfo product_info;
crash_reporter_client->GetProductInfo(&product_info);
std::map<std::string, std::string> annotations;
annotations["prod"] = product_info.product_name;
annotations["ver"] = product_info.version;
#if BUILDFLAG(GOOGLE_CHROME_BRANDING)
// Empty means stable.
const bool allow_empty_channel = true;
if (product_info.channel == "extended") {
// Extended stable reports as stable (empty string) with an extra bool.
product_info.channel.clear();
annotations["extended_stable_channel"] = "true";
}
#else
const bool allow_empty_channel = false;
#endif
if (allow_empty_channel || !product_info.channel.empty()) {
annotations["channel"] = product_info.channel;
}
annotations["plat"] = std::string("Linux");
#if BUILDFLAG(IS_CHROMEOS_DEVICE)
// Chromium OS: save board and builder path for 'tast symbolize'.
annotations["chromeos-board"] = base::SysInfo::GetLsbReleaseBoard();
std::string builder_path;
if (base::SysInfo::GetLsbReleaseValue("CHROMEOS_RELEASE_BUILDER_PATH",
&builder_path)) {
annotations["chromeos-builder-path"] = builder_path;
}
#else
// Other Linux: save lsb-release. This isn't needed on Chromium OS,
// where crash_reporter provides it's own values for lsb-release.
annotations["lsb-release"] = base::GetLinuxDistro();
#endif
std::vector<std::string> arguments;
if (crash_reporter_client->ShouldMonitorCrashHandlerExpensively()) {
arguments.push_back("--monitor-self");
}
// Set up --monitor-self-annotation even in the absence of --monitor-self
// so that minidumps produced by Crashpad's generate_dump tool will
// contain these annotations.
arguments.push_back("--monitor-self-annotation=ptype=crashpad-handler");
#if BUILDFLAG(IS_CHROMEOS_DEVICE)
arguments.push_back("--use-cros-crash-reporter");
if (crash_reporter_client->IsRunningUnattended()) {
arguments.push_back(base::StringPrintf("--minidump-dir-for-tests=%s",
database_path->value().c_str()));
arguments.push_back("--always-allow-feedback");
}
#endif
CHECK(client.StartHandler(handler_path, *database_path, metrics_path, url,
annotations, arguments, false, false));
} else {
int fd = base::GlobalDescriptors::GetInstance()->Get(kCrashDumpSignal);
pid_t pid = 0;
if (!sandbox::NamespaceSandbox::InNewUserNamespace()) {
std::string pid_string =
base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
switches::kCrashpadHandlerPid);
bool parsed = base::StringToInt(pid_string, &pid);
DCHECK(parsed);
}
// SIGSYS handling is reserved for the sandbox.
client.SetUnhandledSignals({SIGSYS});
client.SetHandlerSocket(crashpad::ScopedFileHandle(fd), pid);
*database_path = base::FilePath();
}
// In the not-large-dumps case record enough extra memory to be able to save
// dereferenced memory from all registers on the crashing thread. crashpad may
// save 512-bytes per register, and the largest register set (not including
// stack pointers) is ARM64 with 32 registers. Hence, 16 KiB.
const uint32_t kIndirectMemoryLimit =
crash_reporter_client->GetShouldDumpLargerDumps() ? 4 * 1024 * 1024
: 16 * 1024;
crashpad::CrashpadInfo::GetCrashpadInfo()
->set_gather_indirectly_referenced_memory(crashpad::TriState::kEnabled,
kIndirectMemoryLimit);
#if BUILDFLAG(IS_CHROMEOS_DEVICE)
if (initial_client) {
InformCrashReporterThatCrashpadIsReady();
}
#endif
return true;
}
} // namespace internal
} // namespace crash_reporter
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