blob: c6fef0da0c0b48a23bfb26ae35e00043f167aa3b [file] [log] [blame]
// Copyright 2013 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.
// For linux_syscall_support.h. This makes it safe to call embedded system
// calls when in seccomp mode.
#include "components/crash/app/breakpad_linux.h"
#include <fcntl.h>
#include <poll.h>
#include <signal.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>
#include <algorithm>
#include <string>
#include "base/base_switches.h"
#include "base/command_line.h"
#include "base/debug/crash_logging.h"
#include "base/debug/dump_without_crashing.h"
#include "base/files/file_path.h"
#include "base/linux_util.h"
#include "base/path_service.h"
#include "base/posix/eintr_wrapper.h"
#include "base/posix/global_descriptors.h"
#include "base/process/memory.h"
#include "base/strings/string_util.h"
#include "breakpad/src/client/linux/crash_generation/crash_generation_client.h"
#include "breakpad/src/client/linux/handler/exception_handler.h"
#include "breakpad/src/client/linux/minidump_writer/directory_reader.h"
#include "breakpad/src/common/linux/linux_libc_support.h"
#include "breakpad/src/common/memory.h"
#include "build/build_config.h"
#include "components/crash/app/breakpad_linux_impl.h"
#include "components/crash/app/crash_reporter_client.h"
#include "content/public/common/content_descriptors.h"
#if defined(OS_ANDROID)
#include <android/log.h>
#include <sys/stat.h>
#include "base/android/build_info.h"
#include "base/android/path_utils.h"
#endif
#include "third_party/lss/linux_syscall_support.h"
#if defined(ADDRESS_SANITIZER)
#include <ucontext.h> // for getcontext().
#endif
#if defined(OS_ANDROID)
#define STAT_STRUCT struct stat
#define FSTAT_FUNC fstat
#else
#define STAT_STRUCT struct kernel_stat
#define FSTAT_FUNC sys_fstat
#endif
// Some versions of gcc are prone to warn about unused return values. In cases
// where we either a) know the call cannot fail, or b) there is nothing we
// can do when a call fails, we mark the return code as ignored. This avoids
// spurious compiler warnings.
#define IGNORE_RET(x) do { if (x); } while (0)
using crash_reporter::GetCrashReporterClient;
using google_breakpad::ExceptionHandler;
using google_breakpad::MinidumpDescriptor;
namespace breakpad {
namespace {
#if !defined(OS_CHROMEOS)
const char kUploadURL[] = "https://clients2.google.com/cr/report";
#endif
bool g_is_crash_reporter_enabled = false;
uint64_t g_process_start_time = 0;
pid_t g_pid = 0;
char* g_crash_log_path = NULL;
ExceptionHandler* g_breakpad = NULL;
ExceptionHandler* g_microdump = NULL;
#if defined(ADDRESS_SANITIZER)
const char* g_asan_report_str = NULL;
#endif
#if defined(OS_ANDROID)
char* g_process_type = NULL;
#endif
CrashKeyStorage* g_crash_keys = NULL;
// Writes the value |v| as 16 hex characters to the memory pointed at by
// |output|.
void write_uint64_hex(char* output, uint64_t v) {
static const char hextable[] = "0123456789abcdef";
for (int i = 15; i >= 0; --i) {
output[i] = hextable[v & 15];
v >>= 4;
}
}
// The following helper functions are for calculating uptime.
// Converts a struct timeval to milliseconds.
uint64_t timeval_to_ms(struct timeval *tv) {
uint64_t ret = tv->tv_sec; // Avoid overflow by explicitly using a uint64_t.
ret *= 1000;
ret += tv->tv_usec / 1000;
return ret;
}
// Converts a struct timeval to milliseconds.
uint64_t kernel_timeval_to_ms(struct kernel_timeval *tv) {
uint64_t ret = tv->tv_sec; // Avoid overflow by explicitly using a uint64_t.
ret *= 1000;
ret += tv->tv_usec / 1000;
return ret;
}
// String buffer size to use to convert a uint64_t to string.
const size_t kUint64StringSize = 21;
void SetProcessStartTime() {
// Set the base process start time value.
struct timeval tv;
if (!gettimeofday(&tv, NULL))
g_process_start_time = timeval_to_ms(&tv);
else
g_process_start_time = 0;
}
// uint64_t version of my_int_len() from
// breakpad/src/common/linux/linux_libc_support.h. Return the length of the
// given, non-negative integer when expressed in base 10.
unsigned my_uint64_len(uint64_t i) {
if (!i)
return 1;
unsigned len = 0;
while (i) {
len++;
i /= 10;
}
return len;
}
// uint64_t version of my_uitos() from
// breakpad/src/common/linux/linux_libc_support.h. Convert a non-negative
// integer to a string (not null-terminated).
void my_uint64tos(char* output, uint64_t i, unsigned i_len) {
for (unsigned index = i_len; index; --index, i /= 10)
output[index - 1] = '0' + (i % 10);
}
#if defined(OS_ANDROID)
char* my_strncpy(char* dst, const char* src, size_t len) {
int i = len;
char* p = dst;
if (!dst || !src)
return dst;
while (i != 0 && *src != '\0') {
*p++ = *src++;
i--;
}
while (i != 0) {
*p++ = '\0';
i--;
}
return dst;
}
char* my_strncat(char *dest, const char* src, size_t len) {
char* ret = dest;
while (*dest)
dest++;
while (len--)
if (!(*dest++ = *src++))
return ret;
*dest = 0;
return ret;
}
#endif
#if !defined(OS_CHROMEOS)
bool my_isxdigit(char c) {
return (c >= '0' && c <= '9') || ((c | 0x20) >= 'a' && (c | 0x20) <= 'f');
}
#endif
size_t LengthWithoutTrailingSpaces(const char* str, size_t len) {
while (len > 0 && str[len - 1] == ' ') {
len--;
}
return len;
}
void SetClientIdFromCommandLine(const base::CommandLine& command_line) {
// Get the guid from the command line switch.
std::string switch_value =
command_line.GetSwitchValueASCII(switches::kEnableCrashReporter);
GetCrashReporterClient()->SetCrashReporterClientIdFromGUID(switch_value);
}
// MIME substrings.
#if defined(OS_CHROMEOS)
const char g_sep[] = ":";
#endif
const char g_rn[] = "\r\n";
const char g_form_data_msg[] = "Content-Disposition: form-data; name=\"";
const char g_quote_msg[] = "\"";
const char g_dashdash_msg[] = "--";
const char g_dump_msg[] = "upload_file_minidump\"; filename=\"dump\"";
#if defined(ADDRESS_SANITIZER)
const char g_log_msg[] = "upload_file_log\"; filename=\"log\"";
#endif
const char g_content_type_msg[] = "Content-Type: application/octet-stream";
// MimeWriter manages an iovec for writing MIMEs to a file.
class MimeWriter {
public:
static const int kIovCapacity = 30;
static const size_t kMaxCrashChunkSize = 64;
MimeWriter(int fd, const char* const mime_boundary);
~MimeWriter();
// Append boundary.
virtual void AddBoundary();
// Append end of file boundary.
virtual void AddEnd();
// Append key/value pair with specified sizes.
virtual void AddPairData(const char* msg_type,
size_t msg_type_size,
const char* msg_data,
size_t msg_data_size);
// Append key/value pair.
void AddPairString(const char* msg_type,
const char* msg_data) {
AddPairData(msg_type, my_strlen(msg_type), msg_data, my_strlen(msg_data));
}
// Append key/value pair, splitting value into chunks no larger than
// |chunk_size|. |chunk_size| cannot be greater than |kMaxCrashChunkSize|.
// The msg_type string will have a counter suffix to distinguish each chunk.
virtual void AddPairDataInChunks(const char* msg_type,
size_t msg_type_size,
const char* msg_data,
size_t msg_data_size,
size_t chunk_size,
bool strip_trailing_spaces);
// Add binary file contents to be uploaded with the specified filename.
virtual void AddFileContents(const char* filename_msg,
uint8_t* file_data,
size_t file_size);
// Flush any pending iovecs to the output file.
void Flush() {
IGNORE_RET(sys_writev(fd_, iov_, iov_index_));
iov_index_ = 0;
}
protected:
void AddItem(const void* base, size_t size);
// Minor performance trade-off for easier-to-maintain code.
void AddString(const char* str) {
AddItem(str, my_strlen(str));
}
void AddItemWithoutTrailingSpaces(const void* base, size_t size);
struct kernel_iovec iov_[kIovCapacity];
int iov_index_;
// Output file descriptor.
int fd_;
const char* const mime_boundary_;
private:
DISALLOW_COPY_AND_ASSIGN(MimeWriter);
};
MimeWriter::MimeWriter(int fd, const char* const mime_boundary)
: iov_index_(0),
fd_(fd),
mime_boundary_(mime_boundary) {
}
MimeWriter::~MimeWriter() {
}
void MimeWriter::AddBoundary() {
AddString(mime_boundary_);
AddString(g_rn);
}
void MimeWriter::AddEnd() {
AddString(mime_boundary_);
AddString(g_dashdash_msg);
AddString(g_rn);
}
void MimeWriter::AddPairData(const char* msg_type,
size_t msg_type_size,
const char* msg_data,
size_t msg_data_size) {
AddString(g_form_data_msg);
AddItem(msg_type, msg_type_size);
AddString(g_quote_msg);
AddString(g_rn);
AddString(g_rn);
AddItem(msg_data, msg_data_size);
AddString(g_rn);
}
void MimeWriter::AddPairDataInChunks(const char* msg_type,
size_t msg_type_size,
const char* msg_data,
size_t msg_data_size,
size_t chunk_size,
bool strip_trailing_spaces) {
if (chunk_size > kMaxCrashChunkSize)
return;
unsigned i = 0;
size_t done = 0, msg_length = msg_data_size;
while (msg_length) {
char num[kUint64StringSize];
const unsigned num_len = my_uint_len(++i);
my_uitos(num, i, num_len);
size_t chunk_len = std::min(chunk_size, msg_length);
AddString(g_form_data_msg);
AddItem(msg_type, msg_type_size);
AddItem(num, num_len);
AddString(g_quote_msg);
AddString(g_rn);
AddString(g_rn);
if (strip_trailing_spaces) {
AddItemWithoutTrailingSpaces(msg_data + done, chunk_len);
} else {
AddItem(msg_data + done, chunk_len);
}
AddString(g_rn);
AddBoundary();
Flush();
done += chunk_len;
msg_length -= chunk_len;
}
}
void MimeWriter::AddFileContents(const char* filename_msg, uint8_t* file_data,
size_t file_size) {
AddString(g_form_data_msg);
AddString(filename_msg);
AddString(g_rn);
AddString(g_content_type_msg);
AddString(g_rn);
AddString(g_rn);
AddItem(file_data, file_size);
AddString(g_rn);
}
void MimeWriter::AddItem(const void* base, size_t size) {
// Check if the iovec is full and needs to be flushed to output file.
if (iov_index_ == kIovCapacity) {
Flush();
}
iov_[iov_index_].iov_base = const_cast<void*>(base);
iov_[iov_index_].iov_len = size;
++iov_index_;
}
void MimeWriter::AddItemWithoutTrailingSpaces(const void* base, size_t size) {
AddItem(base, LengthWithoutTrailingSpaces(static_cast<const char*>(base),
size));
}
#if defined(OS_CHROMEOS)
// This subclass is used on Chromium OS to report crashes in a format easy for
// the central crash reporting facility to understand.
// Format is <name>:<data length in decimal>:<data>
class CrashReporterWriter : public MimeWriter {
public:
explicit CrashReporterWriter(int fd);
void AddBoundary() override;
void AddEnd() override;
void AddPairData(const char* msg_type,
size_t msg_type_size,
const char* msg_data,
size_t msg_data_size) override;
void AddPairDataInChunks(const char* msg_type,
size_t msg_type_size,
const char* msg_data,
size_t msg_data_size,
size_t chunk_size,
bool strip_trailing_spaces) override;
void AddFileContents(const char* filename_msg,
uint8_t* file_data,
size_t file_size) override;
private:
DISALLOW_COPY_AND_ASSIGN(CrashReporterWriter);
};
CrashReporterWriter::CrashReporterWriter(int fd) : MimeWriter(fd, "") {}
// No-ops.
void CrashReporterWriter::AddBoundary() {}
void CrashReporterWriter::AddEnd() {}
void CrashReporterWriter::AddPairData(const char* msg_type,
size_t msg_type_size,
const char* msg_data,
size_t msg_data_size) {
char data[kUint64StringSize];
const unsigned data_len = my_uint_len(msg_data_size);
my_uitos(data, msg_data_size, data_len);
AddItem(msg_type, msg_type_size);
AddString(g_sep);
AddItem(data, data_len);
AddString(g_sep);
AddItem(msg_data, msg_data_size);
Flush();
}
void CrashReporterWriter::AddPairDataInChunks(const char* msg_type,
size_t msg_type_size,
const char* msg_data,
size_t msg_data_size,
size_t chunk_size,
bool strip_trailing_spaces) {
if (chunk_size > kMaxCrashChunkSize)
return;
unsigned i = 0;
size_t done = 0;
size_t msg_length = msg_data_size;
while (msg_length) {
char num[kUint64StringSize];
const unsigned num_len = my_uint_len(++i);
my_uitos(num, i, num_len);
size_t chunk_len = std::min(chunk_size, msg_length);
size_t write_len = chunk_len;
if (strip_trailing_spaces) {
// Take care of this here because we need to know the exact length of
// what is going to be written.
write_len = LengthWithoutTrailingSpaces(msg_data + done, write_len);
}
char data[kUint64StringSize];
const unsigned data_len = my_uint_len(write_len);
my_uitos(data, write_len, data_len);
AddItem(msg_type, msg_type_size);
AddItem(num, num_len);
AddString(g_sep);
AddItem(data, data_len);
AddString(g_sep);
AddItem(msg_data + done, write_len);
Flush();
done += chunk_len;
msg_length -= chunk_len;
}
}
void CrashReporterWriter::AddFileContents(const char* filename_msg,
uint8_t* file_data,
size_t file_size) {
char data[kUint64StringSize];
const unsigned data_len = my_uint_len(file_size);
my_uitos(data, file_size, data_len);
AddString(filename_msg);
AddString(g_sep);
AddItem(data, data_len);
AddString(g_sep);
AddItem(file_data, file_size);
Flush();
}
#endif // defined(OS_CHROMEOS)
void DumpProcess() {
if (g_breakpad)
g_breakpad->WriteMinidump();
// If microdumps are enabled write also a microdump on the system log.
if (g_microdump)
g_microdump->WriteMinidump();
}
#if defined(OS_ANDROID)
const char kGoogleBreakpad[] = "google-breakpad";
#endif
size_t WriteLog(const char* buf, size_t nbytes) {
#if defined(OS_ANDROID)
return __android_log_write(ANDROID_LOG_WARN, kGoogleBreakpad, buf);
#else
return sys_write(2, buf, nbytes);
#endif
}
size_t WriteNewline() {
return WriteLog("\n", 1);
}
#if defined(OS_ANDROID)
void AndroidLogWriteHorizontalRule() {
__android_log_write(ANDROID_LOG_WARN, kGoogleBreakpad,
"### ### ### ### ### ### ### ### ### ### ### ### ###");
}
// Android's native crash handler outputs a diagnostic tombstone to the device
// log. By returning false from the HandlerCallbacks, breakpad will reinstall
// the previous (i.e. native) signal handlers before returning from its own
// handler. A Chrome build fingerprint is written to the log, so that the
// specific build of Chrome and the location of the archived Chrome symbols can
// be determined directly from it.
bool FinalizeCrashDoneAndroid(bool is_browser_process) {
base::android::BuildInfo* android_build_info =
base::android::BuildInfo::GetInstance();
AndroidLogWriteHorizontalRule();
__android_log_write(ANDROID_LOG_WARN, kGoogleBreakpad,
"Chrome build fingerprint:");
__android_log_write(ANDROID_LOG_WARN, kGoogleBreakpad,
android_build_info->package_version_name());
__android_log_write(ANDROID_LOG_WARN, kGoogleBreakpad,
android_build_info->package_version_code());
__android_log_write(ANDROID_LOG_WARN, kGoogleBreakpad,
CHROME_BUILD_ID);
AndroidLogWriteHorizontalRule();
if (!is_browser_process &&
android_build_info->sdk_int() >= 18 &&
my_strcmp(android_build_info->build_type(), "eng") != 0 &&
my_strcmp(android_build_info->build_type(), "userdebug") != 0) {
// On JB MR2 and later, the system crash handler displays a dialog. For
// renderer crashes, this is a bad user experience and so this is disabled
// for user builds of Android.
// TODO(cjhopman): There should be some way to recover the crash stack from
// non-uploading user clients. See http://crbug.com/273706.
__android_log_write(ANDROID_LOG_WARN,
kGoogleBreakpad,
"Tombstones are disabled on JB MR2+ user builds.");
AndroidLogWriteHorizontalRule();
return true;
}
return false;
}
#endif
bool CrashDone(const MinidumpDescriptor& minidump,
const bool upload,
const bool succeeded) {
// WARNING: this code runs in a compromised context. It may not call into
// libc nor allocate memory normally.
if (!succeeded) {
const char msg[] = "Failed to generate minidump.";
WriteLog(msg, sizeof(msg) - 1);
return false;
}
DCHECK(!minidump.IsFD());
BreakpadInfo info = {0};
info.filename = minidump.path();
info.fd = minidump.fd();
#if defined(ADDRESS_SANITIZER)
google_breakpad::PageAllocator allocator;
const size_t log_path_len = my_strlen(minidump.path());
char* log_path = reinterpret_cast<char*>(allocator.Alloc(log_path_len + 1));
my_memcpy(log_path, minidump.path(), log_path_len);
my_memcpy(log_path + log_path_len - 4, ".log", 4);
log_path[log_path_len] = '\0';
info.log_filename = log_path;
#endif
info.process_type = "browser";
info.process_type_length = 7;
info.distro = base::g_linux_distro;
info.distro_length = my_strlen(base::g_linux_distro);
info.upload = upload;
info.process_start_time = g_process_start_time;
info.oom_size = base::g_oom_size;
info.pid = g_pid;
info.crash_keys = g_crash_keys;
HandleCrashDump(info);
#if defined(OS_ANDROID)
return FinalizeCrashDoneAndroid(true /* is_browser_process */);
#else
return true;
#endif
}
// Wrapper function, do not add more code here.
bool CrashDoneNoUpload(const MinidumpDescriptor& minidump,
void* context,
bool succeeded) {
return CrashDone(minidump, false, succeeded);
}
#if !defined(OS_ANDROID)
// Wrapper function, do not add more code here.
bool CrashDoneUpload(const MinidumpDescriptor& minidump,
void* context,
bool succeeded) {
return CrashDone(minidump, true, succeeded);
}
#endif
#if defined(ADDRESS_SANITIZER)
extern "C"
void __asan_set_error_report_callback(void (*cb)(const char*));
extern "C"
void AsanLinuxBreakpadCallback(const char* report) {
g_asan_report_str = report;
// Send minidump here.
g_breakpad->SimulateSignalDelivery(SIGKILL);
}
#endif
void EnableCrashDumping(bool unattended) {
g_is_crash_reporter_enabled = true;
base::FilePath tmp_path("/tmp");
PathService::Get(base::DIR_TEMP, &tmp_path);
base::FilePath dumps_path(tmp_path);
if (GetCrashReporterClient()->GetCrashDumpLocation(&dumps_path)) {
base::FilePath logfile =
dumps_path.Append(GetCrashReporterClient()->GetReporterLogFilename());
std::string logfile_str = logfile.value();
const size_t crash_log_path_len = logfile_str.size() + 1;
g_crash_log_path = new char[crash_log_path_len];
strncpy(g_crash_log_path, logfile_str.c_str(), crash_log_path_len);
}
DCHECK(!g_breakpad);
MinidumpDescriptor minidump_descriptor(dumps_path.value());
if (base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kFullMemoryCrashReport)) {
minidump_descriptor.set_size_limit(-1); // unlimited.
} else {
minidump_descriptor.set_size_limit(kMaxMinidumpFileSize);
}
#if defined(OS_ANDROID)
unattended = true; // Android never uploads directly.
#endif
if (unattended) {
g_breakpad = new ExceptionHandler(
minidump_descriptor,
NULL,
CrashDoneNoUpload,
NULL,
true, // Install handlers.
-1); // Server file descriptor. -1 for in-process.
return;
}
#if !defined(OS_ANDROID)
// Attended mode
g_breakpad = new ExceptionHandler(
minidump_descriptor,
NULL,
CrashDoneUpload,
NULL,
true, // Install handlers.
-1); // Server file descriptor. -1 for in-process.
#endif
}
#if defined(OS_ANDROID)
bool MicrodumpCrashDone(const MinidumpDescriptor& minidump,
void* context,
bool succeeded) {
// WARNING: this code runs in a compromised context. It may not call into
// libc nor allocate memory normally.
if (!succeeded) {
static const char msg[] = "Microdump crash handler failed.\n";
WriteLog(msg, sizeof(msg) - 1);
return false;
}
const bool is_browser_process = (context != NULL);
return FinalizeCrashDoneAndroid(is_browser_process);
}
// The microdump handler does NOT upload anything. It just dumps out on the
// system console (logcat) a restricted and serialized variant of a minidump.
// See crbug.com/410294 for more details.
void InitMicrodumpCrashHandlerIfNecessary(const std::string& process_type) {
#if (!defined(ARCH_CPU_ARMEL) && !defined(ARCH_CPU_ARM64))
// TODO(primiano): For the moment microdumps are enabled only on arm (32/64).
// Extend support to other architectures (requires some breakpad changes).
return;
#endif
if (!GetCrashReporterClient()->ShouldEnableBreakpadMicrodumps())
return;
VLOG(1) << "Enabling microdumps crash handler (process_type:"
<< process_type << ")";
DCHECK(!g_microdump);
g_microdump = new ExceptionHandler(
MinidumpDescriptor(MinidumpDescriptor::kMicrodumpOnConsole),
NULL,
MicrodumpCrashDone,
reinterpret_cast<void*>(process_type.empty()),
true, // Install handlers.
-1); // Server file descriptor. -1 for in-process.
return;
}
bool CrashDoneInProcessNoUpload(
const google_breakpad::MinidumpDescriptor& descriptor,
void* context,
const bool succeeded) {
// WARNING: this code runs in a compromised context. It may not call into
// libc nor allocate memory normally.
if (!succeeded) {
static const char msg[] = "Crash dump generation failed.\n";
WriteLog(msg, sizeof(msg) - 1);
return false;
}
// Start constructing the message to send to the browser.
BreakpadInfo info = {0};
info.filename = NULL;
info.fd = descriptor.fd();
info.process_type = g_process_type;
info.process_type_length = my_strlen(g_process_type);
info.distro = NULL;
info.distro_length = 0;
info.upload = false;
info.process_start_time = g_process_start_time;
info.pid = g_pid;
info.crash_keys = g_crash_keys;
HandleCrashDump(info);
return FinalizeCrashDoneAndroid(false /* is_browser_process */);
}
void EnableNonBrowserCrashDumping(const std::string& process_type,
int minidump_fd) {
// This will guarantee that the BuildInfo has been initialized and subsequent
// calls will not require memory allocation.
base::android::BuildInfo::GetInstance();
SetClientIdFromCommandLine(*base::CommandLine::ForCurrentProcess());
// On Android, the current sandboxing uses process isolation, in which the
// child process runs with a different UID. That breaks the normal crash
// reporting where the browser process generates the minidump by inspecting
// the child process. This is because the browser process now does not have
// the permission to access the states of the child process (as it has a
// different UID).
// TODO(jcivelli): http://b/issue?id=6776356 we should use a watchdog
// process forked from the renderer process that generates the minidump.
if (minidump_fd == -1) {
LOG(ERROR) << "Minidump file descriptor not found, crash reporting will "
" not work.";
return;
}
SetProcessStartTime();
g_pid = getpid();
g_is_crash_reporter_enabled = true;
// Save the process type (it is leaked).
const size_t process_type_len = process_type.size() + 1;
g_process_type = new char[process_type_len];
strncpy(g_process_type, process_type.c_str(), process_type_len);
new google_breakpad::ExceptionHandler(MinidumpDescriptor(minidump_fd),
NULL, CrashDoneInProcessNoUpload, NULL, true, -1);
}
#else
// Non-Browser = Extension, Gpu, Plugins, Ppapi and Renderer
class NonBrowserCrashHandler : public google_breakpad::CrashGenerationClient {
public:
NonBrowserCrashHandler()
: server_fd_(base::GlobalDescriptors::GetInstance()->Get(
kCrashDumpSignal)) {
}
~NonBrowserCrashHandler() override {}
bool RequestDump(const void* crash_context,
size_t crash_context_size) override {
int fds[2] = { -1, -1 };
if (sys_socketpair(AF_UNIX, SOCK_STREAM, 0, fds) < 0) {
static const char msg[] = "Failed to create socket for crash dumping.\n";
WriteLog(msg, sizeof(msg) - 1);
return false;
}
// Start constructing the message to send to the browser.
char b; // Dummy variable for sys_read below.
const char* b_addr = &b; // Get the address of |b| so we can create the
// expected /proc/[pid]/syscall content in the
// browser to convert namespace tids.
// The length of the control message:
static const unsigned kControlMsgSize = sizeof(int);
static const unsigned kControlMsgSpaceSize = CMSG_SPACE(kControlMsgSize);
static const unsigned kControlMsgLenSize = CMSG_LEN(kControlMsgSize);
struct kernel_msghdr msg;
my_memset(&msg, 0, sizeof(struct kernel_msghdr));
struct kernel_iovec iov[kCrashIovSize];
iov[0].iov_base = const_cast<void*>(crash_context);
iov[0].iov_len = crash_context_size;
iov[1].iov_base = &b_addr;
iov[1].iov_len = sizeof(b_addr);
iov[2].iov_base = &fds[0];
iov[2].iov_len = sizeof(fds[0]);
iov[3].iov_base = &g_process_start_time;
iov[3].iov_len = sizeof(g_process_start_time);
iov[4].iov_base = &base::g_oom_size;
iov[4].iov_len = sizeof(base::g_oom_size);
google_breakpad::SerializedNonAllocatingMap* serialized_map;
iov[5].iov_len = g_crash_keys->Serialize(
const_cast<const google_breakpad::SerializedNonAllocatingMap**>(
&serialized_map));
iov[5].iov_base = serialized_map;
#if !defined(ADDRESS_SANITIZER)
static_assert(5 == kCrashIovSize - 1, "kCrashIovSize should equal 6");
#else
iov[6].iov_base = const_cast<char*>(g_asan_report_str);
iov[6].iov_len = kMaxAsanReportSize + 1;
static_assert(6 == kCrashIovSize - 1, "kCrashIovSize should equal 7");
#endif
msg.msg_iov = iov;
msg.msg_iovlen = kCrashIovSize;
char cmsg[kControlMsgSpaceSize];
my_memset(cmsg, 0, kControlMsgSpaceSize);
msg.msg_control = cmsg;
msg.msg_controllen = sizeof(cmsg);
struct cmsghdr *hdr = CMSG_FIRSTHDR(&msg);
hdr->cmsg_level = SOL_SOCKET;
hdr->cmsg_type = SCM_RIGHTS;
hdr->cmsg_len = kControlMsgLenSize;
((int*)CMSG_DATA(hdr))[0] = fds[1];
if (HANDLE_EINTR(sys_sendmsg(server_fd_, &msg, 0)) < 0) {
static const char errmsg[] = "Failed to tell parent about crash.\n";
WriteLog(errmsg, sizeof(errmsg) - 1);
IGNORE_RET(sys_close(fds[0]));
IGNORE_RET(sys_close(fds[1]));
return false;
}
IGNORE_RET(sys_close(fds[1]));
if (HANDLE_EINTR(sys_read(fds[0], &b, 1)) != 1) {
static const char errmsg[] = "Parent failed to complete crash dump.\n";
WriteLog(errmsg, sizeof(errmsg) - 1);
}
IGNORE_RET(sys_close(fds[0]));
return true;
}
private:
// The pipe FD to the browser process, which will handle the crash dumping.
const int server_fd_;
DISALLOW_COPY_AND_ASSIGN(NonBrowserCrashHandler);
};
void EnableNonBrowserCrashDumping() {
g_is_crash_reporter_enabled = true;
// We deliberately leak this object.
DCHECK(!g_breakpad);
g_breakpad = new ExceptionHandler(
MinidumpDescriptor("/tmp"), // Unused but needed or Breakpad will assert.
NULL,
NULL,
NULL,
true,
-1);
g_breakpad->set_crash_generation_client(new NonBrowserCrashHandler());
}
#endif // defined(OS_ANDROID)
void SetCrashKeyValue(const base::StringPiece& key,
const base::StringPiece& value) {
g_crash_keys->SetKeyValue(key.data(), value.data());
}
void ClearCrashKey(const base::StringPiece& key) {
g_crash_keys->RemoveKey(key.data());
}
// GetCrashReporterClient() cannot call any Set methods until after
// InitCrashKeys().
void InitCrashKeys() {
g_crash_keys = new CrashKeyStorage;
GetCrashReporterClient()->RegisterCrashKeys();
base::debug::SetCrashKeyReportingFunctions(&SetCrashKeyValue, &ClearCrashKey);
}
// Miscellaneous initialization functions to call after Breakpad has been
// enabled.
void PostEnableBreakpadInitialization() {
SetProcessStartTime();
g_pid = getpid();
base::debug::SetDumpWithoutCrashingFunction(&DumpProcess);
#if defined(ADDRESS_SANITIZER)
// Register the callback for AddressSanitizer error reporting.
__asan_set_error_report_callback(AsanLinuxBreakpadCallback);
#endif
}
} // namespace
void LoadDataFromFD(google_breakpad::PageAllocator& allocator,
int fd, bool close_fd, uint8_t** file_data, size_t* size) {
STAT_STRUCT st;
if (FSTAT_FUNC(fd, &st) != 0) {
static const char msg[] = "Cannot upload crash dump: stat failed\n";
WriteLog(msg, sizeof(msg) - 1);
if (close_fd)
IGNORE_RET(sys_close(fd));
return;
}
*file_data = reinterpret_cast<uint8_t*>(allocator.Alloc(st.st_size));
if (!(*file_data)) {
static const char msg[] = "Cannot upload crash dump: cannot alloc\n";
WriteLog(msg, sizeof(msg) - 1);
if (close_fd)
IGNORE_RET(sys_close(fd));
return;
}
my_memset(*file_data, 0xf, st.st_size);
*size = st.st_size;
int byte_read = sys_read(fd, *file_data, *size);
if (byte_read == -1) {
static const char msg[] = "Cannot upload crash dump: read failed\n";
WriteLog(msg, sizeof(msg) - 1);
if (close_fd)
IGNORE_RET(sys_close(fd));
return;
}
if (close_fd)
IGNORE_RET(sys_close(fd));
}
void LoadDataFromFile(google_breakpad::PageAllocator& allocator,
const char* filename,
int* fd, uint8_t** file_data, size_t* size) {
// WARNING: this code runs in a compromised context. It may not call into
// libc nor allocate memory normally.
*fd = sys_open(filename, O_RDONLY, 0);
*size = 0;
if (*fd < 0) {
static const char msg[] = "Cannot upload crash dump: failed to open\n";
WriteLog(msg, sizeof(msg) - 1);
return;
}
LoadDataFromFD(allocator, *fd, true, file_data, size);
}
// Spawn the appropriate upload process for the current OS:
// - generic Linux invokes wget.
// - ChromeOS invokes crash_reporter.
// |dumpfile| is the path to the dump data file.
// |mime_boundary| is only used on Linux.
// |exe_buf| is only used on CrOS and is the crashing process' name.
void ExecUploadProcessOrTerminate(const BreakpadInfo& info,
const char* dumpfile,
const char* mime_boundary,
const char* exe_buf,
google_breakpad::PageAllocator* allocator) {
#if defined(OS_CHROMEOS)
// CrOS uses crash_reporter instead of wget to report crashes,
// it needs to know where the crash dump lives and the pid and uid of the
// crashing process.
static const char kCrashReporterBinary[] = "/sbin/crash_reporter";
char pid_buf[kUint64StringSize];
uint64_t pid_str_length = my_uint64_len(info.pid);
my_uint64tos(pid_buf, info.pid, pid_str_length);
pid_buf[pid_str_length] = '\0';
char uid_buf[kUint64StringSize];
uid_t uid = geteuid();
uint64_t uid_str_length = my_uint64_len(uid);
my_uint64tos(uid_buf, uid, uid_str_length);
uid_buf[uid_str_length] = '\0';
const char kChromeFlag[] = "--chrome=";
size_t buf_len = my_strlen(dumpfile) + sizeof(kChromeFlag);
char* chrome_flag = reinterpret_cast<char*>(allocator->Alloc(buf_len));
chrome_flag[0] = '\0';
my_strlcat(chrome_flag, kChromeFlag, buf_len);
my_strlcat(chrome_flag, dumpfile, buf_len);
const char kPidFlag[] = "--pid=";
buf_len = my_strlen(pid_buf) + sizeof(kPidFlag);
char* pid_flag = reinterpret_cast<char*>(allocator->Alloc(buf_len));
pid_flag[0] = '\0';
my_strlcat(pid_flag, kPidFlag, buf_len);
my_strlcat(pid_flag, pid_buf, buf_len);
const char kUidFlag[] = "--uid=";
buf_len = my_strlen(uid_buf) + sizeof(kUidFlag);
char* uid_flag = reinterpret_cast<char*>(allocator->Alloc(buf_len));
uid_flag[0] = '\0';
my_strlcat(uid_flag, kUidFlag, buf_len);
my_strlcat(uid_flag, uid_buf, buf_len);
const char kExeBuf[] = "--exe=";
buf_len = my_strlen(exe_buf) + sizeof(kExeBuf);
char* exe_flag = reinterpret_cast<char*>(allocator->Alloc(buf_len));
exe_flag[0] = '\0';
my_strlcat(exe_flag, kExeBuf, buf_len);
my_strlcat(exe_flag, exe_buf, buf_len);
const char* args[] = {
kCrashReporterBinary,
chrome_flag,
pid_flag,
uid_flag,
exe_flag,
NULL,
};
static const char msg[] = "Cannot upload crash dump: cannot exec "
"/sbin/crash_reporter\n";
#else
// The --header argument to wget looks like:
// --header=Content-Type: multipart/form-data; boundary=XYZ
// where the boundary has two fewer leading '-' chars
static const char header_msg[] =
"--header=Content-Type: multipart/form-data; boundary=";
char* const header = reinterpret_cast<char*>(allocator->Alloc(
sizeof(header_msg) - 1 + strlen(mime_boundary) - 2 + 1));
memcpy(header, header_msg, sizeof(header_msg) - 1);
memcpy(header + sizeof(header_msg) - 1, mime_boundary + 2,
strlen(mime_boundary) - 2);
// We grab the NUL byte from the end of |mime_boundary|.
// The --post-file argument to wget looks like:
// --post-file=/tmp/...
static const char post_file_msg[] = "--post-file=";
char* const post_file = reinterpret_cast<char*>(allocator->Alloc(
sizeof(post_file_msg) - 1 + strlen(dumpfile) + 1));
memcpy(post_file, post_file_msg, sizeof(post_file_msg) - 1);
memcpy(post_file + sizeof(post_file_msg) - 1, dumpfile, strlen(dumpfile));
static const char kWgetBinary[] = "/usr/bin/wget";
const char* args[] = {
kWgetBinary,
header,
post_file,
kUploadURL,
"--timeout=10", // Set a timeout so we don't hang forever.
"--tries=1", // Don't retry if the upload fails.
"-O", // output reply to fd 3
"/dev/fd/3",
NULL,
};
static const char msg[] = "Cannot upload crash dump: cannot exec "
"/usr/bin/wget\n";
#endif
execve(args[0], const_cast<char**>(args), environ);
WriteLog(msg, sizeof(msg) - 1);
sys__exit(1);
}
// Runs in the helper process to wait for the upload process running
// ExecUploadProcessOrTerminate() to finish. Returns the number of bytes written
// to |fd| and save the written contents to |buf|.
// |buf| needs to be big enough to hold |bytes_to_read| + 1 characters.
size_t WaitForCrashReportUploadProcess(int fd, size_t bytes_to_read,
char* buf) {
size_t bytes_read = 0;
// Upload should finish in about 10 seconds. Add a few more 500 ms
// internals to account for process startup time.
for (size_t wait_count = 0; wait_count < 24; ++wait_count) {
struct kernel_pollfd poll_fd;
poll_fd.fd = fd;
poll_fd.events = POLLIN | POLLPRI | POLLERR;
int ret = sys_poll(&poll_fd, 1, 500);
if (ret < 0) {
// Error
break;
} else if (ret > 0) {
// There is data to read.
ssize_t len = HANDLE_EINTR(
sys_read(fd, buf + bytes_read, bytes_to_read - bytes_read));
if (len < 0)
break;
bytes_read += len;
if (bytes_read == bytes_to_read)
break;
}
// |ret| == 0 -> timed out, continue waiting.
// or |bytes_read| < |bytes_to_read| still, keep reading.
}
buf[bytes_to_read] = 0; // Always NUL terminate the buffer.
return bytes_read;
}
// |buf| should be |expected_len| + 1 characters in size and NULL terminated.
bool IsValidCrashReportId(const char* buf, size_t bytes_read,
size_t expected_len) {
if (bytes_read != expected_len)
return false;
#if defined(OS_CHROMEOS)
return my_strcmp(buf, "_sys_cr_finished") == 0;
#else
for (size_t i = 0; i < bytes_read; ++i) {
if (!my_isxdigit(buf[i]))
return false;
}
return true;
#endif
}
// |buf| should be |expected_len| + 1 characters in size and NULL terminated.
void HandleCrashReportId(const char* buf, size_t bytes_read,
size_t expected_len) {
WriteNewline();
if (!IsValidCrashReportId(buf, bytes_read, expected_len)) {
#if defined(OS_CHROMEOS)
static const char msg[] =
"System crash-reporter failed to process crash report.";
#else
static const char msg[] = "Failed to get crash dump id.";
#endif
WriteLog(msg, sizeof(msg) - 1);
WriteNewline();
static const char id_msg[] = "Report Id: ";
WriteLog(id_msg, sizeof(id_msg) - 1);
WriteLog(buf, bytes_read);
WriteNewline();
return;
}
#if defined(OS_CHROMEOS)
static const char msg[] = "Crash dump received by crash_reporter\n";
WriteLog(msg, sizeof(msg) - 1);
#else
// Write crash dump id to stderr.
static const char msg[] = "Crash dump id: ";
WriteLog(msg, sizeof(msg) - 1);
WriteLog(buf, my_strlen(buf));
WriteNewline();
// Write crash dump id to crash log as: seconds_since_epoch,crash_id
struct kernel_timeval tv;
if (g_crash_log_path && !sys_gettimeofday(&tv, NULL)) {
uint64_t time = kernel_timeval_to_ms(&tv) / 1000;
char time_str[kUint64StringSize];
const unsigned time_len = my_uint64_len(time);
my_uint64tos(time_str, time, time_len);
const int kLogOpenFlags = O_CREAT | O_WRONLY | O_APPEND | O_CLOEXEC;
int log_fd = sys_open(g_crash_log_path, kLogOpenFlags, 0600);
if (log_fd > 0) {
sys_write(log_fd, time_str, time_len);
sys_write(log_fd, ",", 1);
sys_write(log_fd, buf, my_strlen(buf));
sys_write(log_fd, "\n", 1);
IGNORE_RET(sys_close(log_fd));
}
}
#endif
}
#if defined(OS_CHROMEOS)
const char* GetCrashingProcessName(const BreakpadInfo& info,
google_breakpad::PageAllocator* allocator) {
// Symlink to process binary is at /proc/###/exe.
char linkpath[kUint64StringSize + sizeof("/proc/") + sizeof("/exe")] =
"/proc/";
uint64_t pid_value_len = my_uint64_len(info.pid);
my_uint64tos(linkpath + sizeof("/proc/") - 1, info.pid, pid_value_len);
linkpath[sizeof("/proc/") - 1 + pid_value_len] = '\0';
my_strlcat(linkpath, "/exe", sizeof(linkpath));
const int kMaxSize = 4096;
char* link = reinterpret_cast<char*>(allocator->Alloc(kMaxSize));
if (link) {
ssize_t size = readlink(linkpath, link, kMaxSize);
if (size < kMaxSize && size > 0) {
// readlink(2) doesn't add a terminating NUL, so do it now.
link[size] = '\0';
const char* name = my_strrchr(link, '/');
if (name)
return name + 1;
return link;
}
}
// Either way too long, or a read error.
return "chrome-crash-unknown-process";
}
#endif
void HandleCrashDump(const BreakpadInfo& info) {
int dumpfd;
bool keep_fd = false;
size_t dump_size;
uint8_t* dump_data;
google_breakpad::PageAllocator allocator;
const char* exe_buf = NULL;
if (GetCrashReporterClient()->HandleCrashDump(info.filename)) {
return;
}
#if defined(OS_CHROMEOS)
// Grab the crashing process' name now, when it should still be available.
// If we try to do this later in our grandchild the crashing process has
// already terminated.
exe_buf = GetCrashingProcessName(info, &allocator);
#endif
if (info.fd != -1) {
// Dump is provided with an open FD.
keep_fd = true;
dumpfd = info.fd;
// The FD is pointing to the end of the file.
// Rewind, we'll read the data next.
if (lseek(dumpfd, 0, SEEK_SET) == -1) {
static const char msg[] = "Cannot upload crash dump: failed to "
"reposition minidump FD\n";
WriteLog(msg, sizeof(msg) - 1);
IGNORE_RET(sys_close(dumpfd));
return;
}
LoadDataFromFD(allocator, info.fd, false, &dump_data, &dump_size);
} else {
// Dump is provided with a path.
keep_fd = false;
LoadDataFromFile(allocator, info.filename, &dumpfd, &dump_data, &dump_size);
}
// TODO(jcivelli): make log work when using FDs.
#if defined(ADDRESS_SANITIZER)
int logfd;
size_t log_size;
uint8_t* log_data;
// Load the AddressSanitizer log into log_data.
LoadDataFromFile(allocator, info.log_filename, &logfd, &log_data, &log_size);
#endif
// We need to build a MIME block for uploading to the server. Since we are
// going to fork and run wget, it needs to be written to a temp file.
const int ufd = sys_open("/dev/urandom", O_RDONLY, 0);
if (ufd < 0) {
static const char msg[] = "Cannot upload crash dump because /dev/urandom"
" is missing\n";
WriteLog(msg, sizeof(msg) - 1);
return;
}
static const char temp_file_template[] =
"/tmp/chromium-upload-XXXXXXXXXXXXXXXX";
char temp_file[sizeof(temp_file_template)];
int temp_file_fd = -1;
if (keep_fd) {
temp_file_fd = dumpfd;
// Rewind the destination, we are going to overwrite it.
if (lseek(dumpfd, 0, SEEK_SET) == -1) {
static const char msg[] = "Cannot upload crash dump: failed to "
"reposition minidump FD (2)\n";
WriteLog(msg, sizeof(msg) - 1);
IGNORE_RET(sys_close(dumpfd));
return;
}
} else {
if (info.upload) {
memcpy(temp_file, temp_file_template, sizeof(temp_file_template));
for (unsigned i = 0; i < 10; ++i) {
uint64_t t;
sys_read(ufd, &t, sizeof(t));
write_uint64_hex(temp_file + sizeof(temp_file) - (16 + 1), t);
temp_file_fd = sys_open(temp_file, O_WRONLY | O_CREAT | O_EXCL, 0600);
if (temp_file_fd >= 0)
break;
}
if (temp_file_fd < 0) {
static const char msg[] = "Failed to create temporary file in /tmp: "
"cannot upload crash dump\n";
WriteLog(msg, sizeof(msg) - 1);
IGNORE_RET(sys_close(ufd));
return;
}
} else {
temp_file_fd = sys_open(info.filename, O_WRONLY, 0600);
if (temp_file_fd < 0) {
static const char msg[] = "Failed to save crash dump: failed to open\n";
WriteLog(msg, sizeof(msg) - 1);
IGNORE_RET(sys_close(ufd));
return;
}
}
}
// The MIME boundary is 28 hyphens, followed by a 64-bit nonce and a NUL.
char mime_boundary[28 + 16 + 1];
my_memset(mime_boundary, '-', 28);
uint64_t boundary_rand;
sys_read(ufd, &boundary_rand, sizeof(boundary_rand));
write_uint64_hex(mime_boundary + 28, boundary_rand);
mime_boundary[28 + 16] = 0;
IGNORE_RET(sys_close(ufd));
// The MIME block looks like this:
// BOUNDARY \r\n
// Content-Disposition: form-data; name="prod" \r\n \r\n
// Chrome_Linux \r\n
// BOUNDARY \r\n
// Content-Disposition: form-data; name="ver" \r\n \r\n
// 1.2.3.4 \r\n
// BOUNDARY \r\n
//
// zero or one:
// Content-Disposition: form-data; name="ptime" \r\n \r\n
// abcdef \r\n
// BOUNDARY \r\n
//
// zero or one:
// Content-Disposition: form-data; name="ptype" \r\n \r\n
// abcdef \r\n
// BOUNDARY \r\n
//
// zero or one:
// Content-Disposition: form-data; name="lsb-release" \r\n \r\n
// abcdef \r\n
// BOUNDARY \r\n
//
// zero or one:
// Content-Disposition: form-data; name="oom-size" \r\n \r\n
// 1234567890 \r\n
// BOUNDARY \r\n
//
// zero or more (up to CrashKeyStorage::num_entries = 64):
// Content-Disposition: form-data; name=crash-key-name \r\n
// crash-key-value \r\n
// BOUNDARY \r\n
//
// Content-Disposition: form-data; name="dump"; filename="dump" \r\n
// Content-Type: application/octet-stream \r\n \r\n
// <dump contents>
// \r\n BOUNDARY -- \r\n
#if defined(OS_CHROMEOS)
CrashReporterWriter writer(temp_file_fd);
#else
MimeWriter writer(temp_file_fd, mime_boundary);
#endif
{
const char* product_name = "";
const char* version = "";
GetCrashReporterClient()->GetProductNameAndVersion(&product_name, &version);
writer.AddBoundary();
writer.AddPairString("prod", product_name);
writer.AddBoundary();
writer.AddPairString("ver", version);
writer.AddBoundary();
if (info.pid > 0) {
char pid_value_buf[kUint64StringSize];
uint64_t pid_value_len = my_uint64_len(info.pid);
my_uint64tos(pid_value_buf, info.pid, pid_value_len);
static const char pid_key_name[] = "pid";
writer.AddPairData(pid_key_name, sizeof(pid_key_name) - 1,
pid_value_buf, pid_value_len);
writer.AddBoundary();
}
#if defined(OS_ANDROID)
// Addtional MIME blocks are added for logging on Android devices.
static const char android_build_id[] = "android_build_id";
static const char android_build_fp[] = "android_build_fp";
static const char device[] = "device";
static const char model[] = "model";
static const char brand[] = "brand";
static const char exception_info[] = "exception_info";
base::android::BuildInfo* android_build_info =
base::android::BuildInfo::GetInstance();
writer.AddPairString(
android_build_id, android_build_info->android_build_id());
writer.AddBoundary();
writer.AddPairString(
android_build_fp, android_build_info->android_build_fp());
writer.AddBoundary();
writer.AddPairString(device, android_build_info->device());
writer.AddBoundary();
writer.AddPairString(model, android_build_info->model());
writer.AddBoundary();
writer.AddPairString(brand, android_build_info->brand());
writer.AddBoundary();
if (android_build_info->java_exception_info() != NULL) {
writer.AddPairString(exception_info,
android_build_info->java_exception_info());
writer.AddBoundary();
}
#endif
writer.Flush();
}
if (info.process_start_time > 0) {
struct kernel_timeval tv;
if (!sys_gettimeofday(&tv, NULL)) {
uint64_t time = kernel_timeval_to_ms(&tv);
if (time > info.process_start_time) {
time -= info.process_start_time;
char time_str[kUint64StringSize];
const unsigned time_len = my_uint64_len(time);
my_uint64tos(time_str, time, time_len);
static const char process_time_msg[] = "ptime";
writer.AddPairData(process_time_msg, sizeof(process_time_msg) - 1,
time_str, time_len);
writer.AddBoundary();
writer.Flush();
}
}
}
if (info.process_type_length) {
writer.AddPairString("ptype", info.process_type);
writer.AddBoundary();
writer.Flush();
}
if (info.distro_length) {
static const char distro_msg[] = "lsb-release";
writer.AddPairString(distro_msg, info.distro);
writer.AddBoundary();
writer.Flush();
}
if (info.oom_size) {
char oom_size_str[kUint64StringSize];
const unsigned oom_size_len = my_uint64_len(info.oom_size);
my_uint64tos(oom_size_str, info.oom_size, oom_size_len);
static const char oom_size_msg[] = "oom-size";
writer.AddPairData(oom_size_msg, sizeof(oom_size_msg) - 1,
oom_size_str, oom_size_len);
writer.AddBoundary();
writer.Flush();
}
if (info.crash_keys) {
CrashKeyStorage::Iterator crash_key_iterator(*info.crash_keys);
const CrashKeyStorage::Entry* entry;
while ((entry = crash_key_iterator.Next())) {
writer.AddPairString(entry->key, entry->value);
writer.AddBoundary();
writer.Flush();
}
}
writer.AddFileContents(g_dump_msg, dump_data, dump_size);
#if defined(ADDRESS_SANITIZER)
// Append a multipart boundary and the contents of the AddressSanitizer log.
writer.AddBoundary();
writer.AddFileContents(g_log_msg, log_data, log_size);
#endif
writer.AddEnd();
writer.Flush();
IGNORE_RET(sys_close(temp_file_fd));
#if defined(OS_ANDROID)
if (info.filename) {
int filename_length = my_strlen(info.filename);
// If this was a file, we need to copy it to the right place and use the
// right file name so it gets uploaded by the browser.
const char msg[] = "Output crash dump file:";
WriteLog(msg, sizeof(msg) - 1);
WriteLog(info.filename, filename_length - 1);
char pid_buf[kUint64StringSize];
uint64_t pid_str_length = my_uint64_len(info.pid);
my_uint64tos(pid_buf, info.pid, pid_str_length);
// -1 because we won't need the null terminator on the original filename.
unsigned done_filename_len = filename_length - 1 + pid_str_length;
char* done_filename = reinterpret_cast<char*>(
allocator.Alloc(done_filename_len));
// Rename the file such that the pid is the suffix in order signal to other
// processes that the minidump is complete. The advantage of using the pid
// as the suffix is that it is trivial to associate the minidump with the
// crashed process.
// Finally, note strncpy prevents null terminators from
// being copied. Pad the rest with 0's.
my_strncpy(done_filename, info.filename, done_filename_len);
// Append the suffix a null terminator should be added.
my_strncat(done_filename, pid_buf, pid_str_length);
// Rename the minidump file to signal that it is complete.
if (rename(info.filename, done_filename)) {
const char failed_msg[] = "Failed to rename:";
WriteLog(failed_msg, sizeof(failed_msg) - 1);
WriteLog(info.filename, filename_length - 1);
const char to_msg[] = "to";
WriteLog(to_msg, sizeof(to_msg) - 1);
WriteLog(done_filename, done_filename_len - 1);
}
}
#endif
if (!info.upload)
return;
const pid_t child = sys_fork();
if (!child) {
// Spawned helper process.
//
// This code is called both when a browser is crashing (in which case,
// nothing really matters any more) and when a renderer/plugin crashes, in
// which case we need to continue.
//
// Since we are a multithreaded app, if we were just to fork(), we might
// grab file descriptors which have just been created in another thread and
// hold them open for too long.
//
// Thus, we have to loop and try and close everything.
const int fd = sys_open("/proc/self/fd", O_DIRECTORY | O_RDONLY, 0);
if (fd < 0) {
for (unsigned i = 3; i < 8192; ++i)
IGNORE_RET(sys_close(i));
} else {
google_breakpad::DirectoryReader reader(fd);
const char* name;
while (reader.GetNextEntry(&name)) {
int i;
if (my_strtoui(&i, name) && i > 2 && i != fd)
IGNORE_RET(sys_close(i));
reader.PopEntry();
}
IGNORE_RET(sys_close(fd));
}
IGNORE_RET(sys_setsid());
// Leave one end of a pipe in the upload process and watch for it getting
// closed by the upload process exiting.
int fds[2];
if (sys_pipe(fds) >= 0) {
const pid_t upload_child = sys_fork();
if (!upload_child) {
// Upload process.
IGNORE_RET(sys_close(fds[0]));
IGNORE_RET(sys_dup2(fds[1], 3));
ExecUploadProcessOrTerminate(info, temp_file, mime_boundary, exe_buf,
&allocator);
}
// Helper process.
if (upload_child > 0) {
IGNORE_RET(sys_close(fds[1]));
const size_t kCrashIdLength = 16;
char id_buf[kCrashIdLength + 1];
size_t bytes_read =
WaitForCrashReportUploadProcess(fds[0], kCrashIdLength, id_buf);
HandleCrashReportId(id_buf, bytes_read, kCrashIdLength);
if (sys_waitpid(upload_child, NULL, WNOHANG) == 0) {
// Upload process is still around, kill it.
sys_kill(upload_child, SIGKILL);
}
}
}
// Helper process.
IGNORE_RET(sys_unlink(info.filename));
#if defined(ADDRESS_SANITIZER)
IGNORE_RET(sys_unlink(info.log_filename));
#endif
IGNORE_RET(sys_unlink(temp_file));
sys__exit(0);
}
// Main browser process.
if (child <= 0)
return;
(void) HANDLE_EINTR(sys_waitpid(child, NULL, 0));
}
void InitCrashReporter(const std::string& process_type) {
#if defined(OS_ANDROID)
// This will guarantee that the BuildInfo has been initialized and subsequent
// calls will not require memory allocation.
base::android::BuildInfo::GetInstance();
// Handler registration is LIFO. Install the microdump handler first, such
// that if conventional minidump crash reporting is enabled below, it takes
// precedence (i.e. its handler is run first) over the microdump handler.
InitMicrodumpCrashHandlerIfNecessary(process_type);
#endif
// Determine the process type and take appropriate action.
const base::CommandLine& parsed_command_line =
*base::CommandLine::ForCurrentProcess();
if (parsed_command_line.HasSwitch(switches::kDisableBreakpad))
return;
if (process_type.empty()) {
bool enable_breakpad = GetCrashReporterClient()->GetCollectStatsConsent() ||
GetCrashReporterClient()->IsRunningUnattended();
enable_breakpad &=
!parsed_command_line.HasSwitch(switches::kDisableBreakpad);
if (!enable_breakpad) {
enable_breakpad = parsed_command_line.HasSwitch(
switches::kEnableCrashReporterForTesting);
}
if (!enable_breakpad) {
VLOG(1) << "Breakpad disabled";
return;
}
InitCrashKeys();
EnableCrashDumping(GetCrashReporterClient()->IsRunningUnattended());
} else if (GetCrashReporterClient()->EnableBreakpadForProcess(process_type)) {
#if defined(OS_ANDROID)
NOTREACHED() << "Breakpad initialized with InitCrashReporter() instead of "
"InitNonBrowserCrashReporter in " << process_type << " process.";
return;
#else
// We might be chrooted in a zygote or renderer process so we cannot call
// GetCollectStatsConsent because that needs access the the user's home
// dir. Instead, we set a command line flag for these processes.
// Even though plugins are not chrooted, we share the same code path for
// simplicity.
if (!parsed_command_line.HasSwitch(switches::kEnableCrashReporter))
return;
InitCrashKeys();
SetClientIdFromCommandLine(parsed_command_line);
EnableNonBrowserCrashDumping();
VLOG(1) << "Non Browser crash dumping enabled for: " << process_type;
#endif // #if defined(OS_ANDROID)
}
PostEnableBreakpadInitialization();
}
#if defined(OS_ANDROID)
void InitNonBrowserCrashReporterForAndroid(const std::string& process_type) {
const base::CommandLine* command_line =
base::CommandLine::ForCurrentProcess();
// Handler registration is LIFO. Install the microdump handler first, such
// that if conventional minidump crash reporting is enabled below, it takes
// precedence (i.e. its handler is run first) over the microdump handler.
InitMicrodumpCrashHandlerIfNecessary(process_type);
if (command_line->HasSwitch(switches::kEnableCrashReporter)) {
// On Android we need to provide a FD to the file where the minidump is
// generated as the renderer and browser run with different UIDs
// (preventing the browser from inspecting the renderer process).
int minidump_fd = base::GlobalDescriptors::GetInstance()->MaybeGet(
GetCrashReporterClient()->GetAndroidMinidumpDescriptor());
if (minidump_fd < 0) {
NOTREACHED() << "Could not find minidump FD, crash reporting disabled.";
} else {
InitCrashKeys();
EnableNonBrowserCrashDumping(process_type, minidump_fd);
}
}
}
#endif // OS_ANDROID
bool IsCrashReporterEnabled() {
return g_is_crash_reporter_enabled;
}
} // namespace breakpad