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breakpad/src/client/linux/handler/minidump_generator.cc

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// Copyright (c) 2006, Google Inc.
// All rights reserved.
//
// Author: Li Liu
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <fcntl.h>
#include <pthread.h>
#include <signal.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/utsname.h>
#include <sys/wait.h>
#include <cstdlib>
#include <ctime>
#include "common/linux/file_id.h"
#include "client/linux/handler/linux_thread.h"
#include "client/minidump_file_writer.h"
#include "client/minidump_file_writer-inl.h"
#include "google_breakpad/common/minidump_format.h"
#include "client/linux/handler/minidump_generator.h"
#ifndef CLONE_UNTRACED
#define CLONE_UNTRACED 0x00800000
#endif
// This unnamed namespace contains helper functions.
namespace {
using namespace google_breakpad;
// Argument for the writer function.
struct WriterArgument {
MinidumpFileWriter *minidump_writer;
// Context for the callback.
void *version_context;
// Pid of the thread who called WriteMinidumpToFile
int requester_pid;
// The stack bottom of the thread which caused the dump.
// Mainly used to find the thread id of the crashed thread since signal
// handler may not be called in the thread who caused it.
uintptr_t crashed_stack_bottom;
// Pid of the crashing thread.
int crashed_pid;
// Signal number when crash happed. Can be 0 if this is a requested dump.
int signo;
// The ebp of the signal handler frame. Can be zero if this
// is a requested dump.
uintptr_t sighandler_ebp;
// Signal context when crash happed. Can be NULL if this is a requested dump.
// This is actually an out parameter, but it will be filled in at the start
// of the writer thread.
struct sigcontext *sig_ctx;
// Used to get information about the threads.
LinuxThread *thread_lister;
};
// Holding context information for the callback of finding the crashing thread.
struct FindCrashThreadContext {
const LinuxThread *thread_lister;
uintptr_t crashing_stack_bottom;
int crashing_thread_pid;
FindCrashThreadContext() :
thread_lister(NULL),
crashing_stack_bottom(0UL),
crashing_thread_pid(-1) {
}
};
// Callback for list threads.
// It will compare the stack bottom of the provided thread with the stack
// bottom of the crashed thread, it they are eqaul, this is thread is the one
// who crashed.
bool IsThreadCrashedCallback(const ThreadInfo &thread_info, void *context) {
FindCrashThreadContext *crashing_context =
static_cast<FindCrashThreadContext *>(context);
const LinuxThread *thread_lister = crashing_context->thread_lister;
struct user_regs_struct regs;
if (thread_lister->GetRegisters(thread_info.pid, &regs)) {
uintptr_t last_ebp = regs.ebp;
uintptr_t stack_bottom = thread_lister->GetThreadStackBottom(last_ebp);
if (stack_bottom > last_ebp &&
stack_bottom == crashing_context->crashing_stack_bottom) {
// Got it. Stop iteration.
crashing_context->crashing_thread_pid = thread_info.pid;
return false;
}
}
return true;
}
// Find the crashing thread id.
// This is done based on stack bottom comparing.
int FindCrashingThread(uintptr_t crashing_stack_bottom,
int requester_pid,
const LinuxThread *thread_lister) {
FindCrashThreadContext context;
context.thread_lister = thread_lister;
context.crashing_stack_bottom = crashing_stack_bottom;
CallbackParam<ThreadCallback> callback_param(IsThreadCrashedCallback,
&context);
thread_lister->ListThreads(&callback_param);
return context.crashing_thread_pid;
}
// Write the thread stack info minidump.
bool WriteThreadStack(uintptr_t last_ebp,
uintptr_t last_esp,
const LinuxThread *thread_lister,
UntypedMDRVA *memory,
MDMemoryDescriptor *loc) {
// Maximum stack size for a thread.
uintptr_t stack_bottom = thread_lister->GetThreadStackBottom(last_ebp);
if (stack_bottom > last_esp) {
int size = stack_bottom - last_esp;
if (size > 0) {
if (!memory->Allocate(size))
return false;
memory->Copy(reinterpret_cast<void*>(last_esp), size);
loc->start_of_memory_range = 0 | last_esp;
loc->memory = memory->location();
}
return true;
}
return false;
}
// Write CPU context based on signal context.
bool WriteContext(MDRawContextX86 *context, const struct sigcontext *sig_ctx,
const DebugRegs *debug_regs) {
assert(sig_ctx != NULL);
context->context_flags = MD_CONTEXT_X86_FULL;
context->gs = sig_ctx->gs;
context->fs = sig_ctx->fs;
context->es = sig_ctx->es;
context->ds = sig_ctx->ds;
context->cs = sig_ctx->cs;
context->ss = sig_ctx->ss;
context->edi = sig_ctx->edi;
context->esi = sig_ctx->esi;
context->ebp = sig_ctx->ebp;
context->esp = sig_ctx->esp;
context->ebx = sig_ctx->ebx;
context->edx = sig_ctx->edx;
context->ecx = sig_ctx->ecx;
context->eax = sig_ctx->eax;
context->eip = sig_ctx->eip;
context->eflags = sig_ctx->eflags;
if (sig_ctx->fpstate != NULL) {
context->context_flags = MD_CONTEXT_X86_FULL |
MD_CONTEXT_X86_FLOATING_POINT;
context->float_save.control_word = sig_ctx->fpstate->cw;
context->float_save.status_word = sig_ctx->fpstate->sw;
context->float_save.tag_word = sig_ctx->fpstate->tag;
context->float_save.error_offset = sig_ctx->fpstate->ipoff;
context->float_save.error_selector = sig_ctx->fpstate->cssel;
context->float_save.data_offset = sig_ctx->fpstate->dataoff;
context->float_save.data_selector = sig_ctx->fpstate->datasel;
memcpy(context->float_save.register_area, sig_ctx->fpstate->_st,
sizeof(context->float_save.register_area));
}
if (debug_regs != NULL) {
context->context_flags |= MD_CONTEXT_X86_DEBUG_REGISTERS;
context->dr0 = debug_regs->dr0;
context->dr1 = debug_regs->dr1;
context->dr2 = debug_regs->dr2;
context->dr3 = debug_regs->dr3;
context->dr6 = debug_regs->dr6;
context->dr7 = debug_regs->dr7;
}
return true;
}
// Write CPU context based on provided registers.
bool WriteContext(MDRawContextX86 *context,
const struct user_regs_struct *regs,
const struct user_fpregs_struct *fp_regs,
const DebugRegs *dbg_regs) {
if (!context || !regs)
return false;
context->context_flags = MD_CONTEXT_X86_FULL;
context->cs = regs->xcs;
context->ds = regs->xds;
context->es = regs->xes;
context->fs = regs->xfs;
context->gs = regs->xgs;
context->ss = regs->xss;
context->edi = regs->edi;
context->esi = regs->esi;
context->ebx = regs->ebx;
context->edx = regs->edx;
context->ecx = regs->ecx;
context->eax = regs->eax;
context->ebp = regs->ebp;
context->eip = regs->eip;
context->esp = regs->esp;
context->eflags = regs->eflags;
if (dbg_regs != NULL) {
context->context_flags |= MD_CONTEXT_X86_DEBUG_REGISTERS;
context->dr0 = dbg_regs->dr0;
context->dr1 = dbg_regs->dr1;
context->dr2 = dbg_regs->dr2;
context->dr3 = dbg_regs->dr3;
context->dr6 = dbg_regs->dr6;
context->dr7 = dbg_regs->dr7;
}
if (fp_regs != NULL) {
context->context_flags |= MD_CONTEXT_X86_FLOATING_POINT;
context->float_save.control_word = fp_regs->cwd;
context->float_save.status_word = fp_regs->swd;
context->float_save.tag_word = fp_regs->twd;
context->float_save.error_offset = fp_regs->fip;
context->float_save.error_selector = fp_regs->fcs;
context->float_save.data_offset = fp_regs->foo;
context->float_save.data_selector = fp_regs->fos;
context->float_save.data_selector = fp_regs->fos;
memcpy(context->float_save.register_area, fp_regs->st_space,
sizeof(context->float_save.register_area));
}
return true;
}
// Write information about a crashed thread.
// When a thread crash, kernel will write something on the stack for processing
// signal. This makes the current stack not reliable, and our stack walker
// won't figure out the whole call stack for this. So we write the stack at the
// time of the crash into the minidump file, not the current stack.
bool WriteCrashedThreadStream(MinidumpFileWriter *minidump_writer,
const WriterArgument *writer_args,
const ThreadInfo &thread_info,
MDRawThread *thread) {
assert(writer_args->sig_ctx != NULL);
thread->thread_id = thread_info.pid;
UntypedMDRVA memory(minidump_writer);
if (!WriteThreadStack(writer_args->sig_ctx->ebp,
writer_args->sig_ctx->esp,
writer_args->thread_lister,
&memory,
&thread->stack))
return false;
TypedMDRVA<MDRawContextX86> context(minidump_writer);
if (!context.Allocate())
return false;
thread->thread_context = context.location();
memset(context.get(), 0, sizeof(MDRawContextX86));
return WriteContext(context.get(), writer_args->sig_ctx, NULL);
}
// Write information about a thread.
// This function only processes thread running normally at the crash.
bool WriteThreadStream(MinidumpFileWriter *minidump_writer,
const LinuxThread *thread_lister,
const ThreadInfo &thread_info,
MDRawThread *thread) {
thread->thread_id = thread_info.pid;
struct user_regs_struct regs;
memset(&regs, 0, sizeof(regs));
if (!thread_lister->GetRegisters(thread_info.pid, &regs)) {
perror(NULL);
return false;
}
UntypedMDRVA memory(minidump_writer);
if (!WriteThreadStack(regs.ebp,
regs.esp,
thread_lister,
&memory,
&thread->stack))
return false;
struct user_fpregs_struct fp_regs;
DebugRegs dbg_regs;
memset(&fp_regs, 0, sizeof(fp_regs));
// Get all the registers.
thread_lister->GetFPRegisters(thread_info.pid, &fp_regs);
thread_lister->GetDebugRegisters(thread_info.pid, &dbg_regs);
// Write context
TypedMDRVA<MDRawContextX86> context(minidump_writer);
if (!context.Allocate())
return false;
thread->thread_context = context.location();
memset(context.get(), 0, sizeof(MDRawContextX86));
return WriteContext(context.get(), &regs, &fp_regs, &dbg_regs);
}
bool WriteCPUInformation(MDRawSystemInfo *sys_info) {
const char *proc_cpu_path = "/proc/cpuinfo";
char line[128];
char vendor_id[13];
const char vendor_id_name[] = "vendor_id";
const size_t vendor_id_name_length = sizeof(vendor_id_name) - 1;
struct CpuInfoEntry {
const char *info_name;
int value;
} cpu_info_table[] = {
{ "processor", -1 },
{ "model", 0 },
{ "stepping", 0 },
{ "cpuid level", 0 },
{ NULL, -1 },
};
memset(vendor_id, 0, sizeof(vendor_id));
FILE *fp = fopen(proc_cpu_path, "r");
if (fp != NULL) {
while (fgets(line, sizeof(line), fp)) {
CpuInfoEntry *entry = &cpu_info_table[0];
while (entry->info_name != NULL) {
if (!strncmp(line, entry->info_name, strlen(entry->info_name))) {
char *value = strchr(line, ':');
value++;
if (value != NULL)
sscanf(value, " %d", &(entry->value));
}
entry++;
}
// special case for vendor_id
if (!strncmp(line, vendor_id_name, vendor_id_name_length)) {
char *value = strchr(line, ':');
if (value == NULL)
continue;
value++;
while (*value && isspace(*value))
value++;
if (*value) {
size_t length = strlen(value);
// we don't want the trailing newline
if (value[length - 1] == '\n')
length--;
// ensure we have space for the value
if (length < sizeof(vendor_id))
strncpy(vendor_id, value, length);
}
}
}
fclose(fp);
}
// /proc/cpuinfo contains cpu id, change it into number by adding one.
cpu_info_table[0].value++;
sys_info->number_of_processors = cpu_info_table[0].value;
sys_info->processor_level = cpu_info_table[3].value;
sys_info->processor_revision = cpu_info_table[1].value << 8 |
cpu_info_table[2].value;
sys_info->processor_architecture = MD_CPU_ARCHITECTURE_UNKNOWN;
struct utsname uts;
if (uname(&uts) == 0) {
// Match i*86 and x86* as X86 architecture.
if ((strstr(uts.machine, "x86") == uts.machine) ||
(strlen(uts.machine) == 4 &&
uts.machine[0] == 'i' &&
uts.machine[2] == '8' &&
uts.machine[3] == '6')) {
sys_info->processor_architecture = MD_CPU_ARCHITECTURE_X86;
if (vendor_id[0] != '\0')
memcpy(sys_info->cpu.x86_cpu_info.vendor_id, vendor_id,
sizeof(sys_info->cpu.x86_cpu_info.vendor_id));
}
}
return true;
}
bool WriteOSInformation(MinidumpFileWriter *minidump_writer,
MDRawSystemInfo *sys_info) {
sys_info->platform_id = MD_OS_LINUX;
struct utsname uts;
if (uname(&uts) == 0) {
char os_version[512];
size_t space_left = sizeof(os_version);
memset(os_version, 0, space_left);
const char *os_info_table[] = {
uts.sysname,
uts.release,
uts.version,
uts.machine,
"GNU/Linux",
NULL
};
for (const char **cur_os_info = os_info_table;
*cur_os_info != NULL;
cur_os_info++) {
if (cur_os_info != os_info_table && space_left > 1) {
strcat(os_version, " ");
space_left--;
}
if (space_left > strlen(*cur_os_info)) {
strcat(os_version, *cur_os_info);
space_left -= strlen(*cur_os_info);
} else {
break;
}
}
MDLocationDescriptor location;
if (!minidump_writer->WriteString(os_version, 0, &location))
return false;
sys_info->csd_version_rva = location.rva;
}
return true;
}
// Callback context for get writting thread information.
struct ThreadInfoCallbackCtx {
MinidumpFileWriter *minidump_writer;
const WriterArgument *writer_args;
TypedMDRVA<MDRawThreadList> *list;
int thread_index;
};
// Callback run for writing threads information in the process.
bool ThreadInfomationCallback(const ThreadInfo &thread_info,
void *context) {
ThreadInfoCallbackCtx *callback_context =
static_cast<ThreadInfoCallbackCtx *>(context);
bool success = true;
MDRawThread thread;
memset(&thread, 0, sizeof(MDRawThread));
if (thread_info.pid != callback_context->writer_args->crashed_pid ||
callback_context->writer_args->sig_ctx == NULL) {
success = WriteThreadStream(callback_context->minidump_writer,
callback_context->writer_args->thread_lister,
thread_info, &thread);
} else {
success = WriteCrashedThreadStream(callback_context->minidump_writer,
callback_context->writer_args,
thread_info, &thread);
}
if (success) {
callback_context->list->CopyIndexAfterObject(
callback_context->thread_index++,
&thread, sizeof(MDRawThread));
}
return success;
}
// Stream writers
bool WriteThreadListStream(MinidumpFileWriter *minidump_writer,
const WriterArgument *writer_args,
MDRawDirectory *dir) {
// Get the thread information.
const LinuxThread *thread_lister = writer_args->thread_lister;
int thread_count = thread_lister->GetThreadCount();
if (thread_count < 0)
return false;
TypedMDRVA<MDRawThreadList> list(minidump_writer);
if (!list.AllocateObjectAndArray(thread_count, sizeof(MDRawThread)))
return false;
dir->stream_type = MD_THREAD_LIST_STREAM;
dir->location = list.location();
list.get()->number_of_threads = thread_count;
ThreadInfoCallbackCtx context;
context.minidump_writer = minidump_writer;
context.writer_args = writer_args;
context.list = &list;
context.thread_index = 0;
CallbackParam<ThreadCallback> callback_param(ThreadInfomationCallback,
&context);
int written = thread_lister->ListThreads(&callback_param);
return written == thread_count;
}
bool WriteCVRecord(MinidumpFileWriter *minidump_writer,
MDRawModule *module,
const char *module_path) {
TypedMDRVA<MDCVInfoPDB70> cv(minidump_writer);
// Only return the last path component of the full module path
const char *module_name = strrchr(module_path, '/');
// Increment past the slash
if (module_name)
++module_name;
else
module_name = "<Unknown>";
size_t module_name_length = strlen(module_name);
if (!cv.AllocateObjectAndArray(module_name_length + 1, sizeof(u_int8_t)))
return false;
if (!cv.CopyIndexAfterObject(0, const_cast<char *>(module_name),
module_name_length))
return false;
module->cv_record = cv.location();
MDCVInfoPDB70 *cv_ptr = cv.get();
memset(cv_ptr, 0, sizeof(MDCVInfoPDB70));
cv_ptr->cv_signature = MD_CVINFOPDB70_SIGNATURE;
cv_ptr->age = 0;
// Get the module identifier
FileID file_id(module_path);
unsigned char identifier[16];
if (file_id.ElfFileIdentifier(identifier)) {
cv_ptr->signature.data1 = (uint32_t)identifier[0] << 24 |
(uint32_t)identifier[1] << 16 | (uint32_t)identifier[2] << 8 |
(uint32_t)identifier[3];
cv_ptr->signature.data2 = (uint32_t)identifier[4] << 8 | identifier[5];
cv_ptr->signature.data3 = (uint32_t)identifier[6] << 8 | identifier[7];
cv_ptr->signature.data4[0] = identifier[8];
cv_ptr->signature.data4[1] = identifier[9];
cv_ptr->signature.data4[2] = identifier[10];
cv_ptr->signature.data4[3] = identifier[11];
cv_ptr->signature.data4[4] = identifier[12];
cv_ptr->signature.data4[5] = identifier[13];
cv_ptr->signature.data4[6] = identifier[14];
cv_ptr->signature.data4[7] = identifier[15];
}
return true;
}
struct ModuleInfoCallbackCtx {
MinidumpFileWriter *minidump_writer;
const WriterArgument *writer_args;
TypedMDRVA<MDRawModuleList> *list;
int module_index;
};
bool ModuleInfoCallback(const ModuleInfo &module_info,
void *context) {
ModuleInfoCallbackCtx *callback_context =
static_cast<ModuleInfoCallbackCtx *>(context);
// Skip those modules without name, or those that are not modules.
if (strlen(module_info.name) == 0 ||
!strchr(module_info.name, '/'))
return true;
MDRawModule module;
memset(&module, 0, sizeof(module));
MDLocationDescriptor loc;
if (!callback_context->minidump_writer->WriteString(module_info.name, 0,
&loc))
return false;
module.base_of_image = (u_int64_t)module_info.start_addr;
module.size_of_image = module_info.size;
module.module_name_rva = loc.rva;
if (!WriteCVRecord(callback_context->minidump_writer, &module,
module_info.name))
return false;
callback_context->list->CopyIndexAfterObject(
callback_context->module_index++, &module, MD_MODULE_SIZE);
return true;
}
bool WriteModuleListStream(MinidumpFileWriter *minidump_writer,
const WriterArgument *writer_args,
MDRawDirectory *dir) {
TypedMDRVA<MDRawModuleList> list(minidump_writer);
int module_count = writer_args->thread_lister->GetModuleCount();
if (module_count <= 0 ||
!list.AllocateObjectAndArray(module_count, MD_MODULE_SIZE))
return false;
dir->stream_type = MD_MODULE_LIST_STREAM;
dir->location = list.location();
list.get()->number_of_modules = module_count;
ModuleInfoCallbackCtx context;
context.minidump_writer = minidump_writer;
context.writer_args = writer_args;
context.list = &list;
context.module_index = 0;
CallbackParam<ModuleCallback> callback(ModuleInfoCallback, &context);
return writer_args->thread_lister->ListModules(&callback) == module_count;
}
bool WriteSystemInfoStream(MinidumpFileWriter *minidump_writer,
const WriterArgument *writer_args,
MDRawDirectory *dir) {
TypedMDRVA<MDRawSystemInfo> sys_info(minidump_writer);
if (!sys_info.Allocate())
return false;
dir->stream_type = MD_SYSTEM_INFO_STREAM;
dir->location = sys_info.location();
return WriteCPUInformation(sys_info.get()) &&
WriteOSInformation(minidump_writer, sys_info.get());
}
bool WriteExceptionStream(MinidumpFileWriter *minidump_writer,
const WriterArgument *writer_args,
MDRawDirectory *dir) {
// This happenes when this is not a crash, but a requested dump.
if (writer_args->sig_ctx == NULL)
return false;
TypedMDRVA<MDRawExceptionStream> exception(minidump_writer);
if (!exception.Allocate())
return false;
dir->stream_type = MD_EXCEPTION_STREAM;
dir->location = exception.location();
exception.get()->thread_id = writer_args->crashed_pid;
exception.get()->exception_record.exception_code = writer_args->signo;
exception.get()->exception_record.exception_flags = 0;
if (writer_args->sig_ctx != NULL) {
exception.get()->exception_record.exception_address =
writer_args->sig_ctx->eip;
} else {
return true;
}
// Write context of the exception.
TypedMDRVA<MDRawContextX86> context(minidump_writer);
if (!context.Allocate())
return false;
exception.get()->thread_context = context.location();
memset(context.get(), 0, sizeof(MDRawContextX86));
return WriteContext(context.get(), writer_args->sig_ctx, NULL);
}
bool WriteMiscInfoStream(MinidumpFileWriter *minidump_writer,
const WriterArgument *writer_args,
MDRawDirectory *dir) {
TypedMDRVA<MDRawMiscInfo> info(minidump_writer);
if (!info.Allocate())
return false;
dir->stream_type = MD_MISC_INFO_STREAM;
dir->location = info.location();
info.get()->size_of_info = sizeof(MDRawMiscInfo);
info.get()->flags1 = MD_MISCINFO_FLAGS1_PROCESS_ID;
info.get()->process_id = writer_args->requester_pid;
return true;
}
bool WriteBreakpadInfoStream(MinidumpFileWriter *minidump_writer,
const WriterArgument *writer_args,
MDRawDirectory *dir) {
TypedMDRVA<MDRawBreakpadInfo> info(minidump_writer);
if (!info.Allocate())
return false;
dir->stream_type = MD_BREAKPAD_INFO_STREAM;
dir->location = info.location();
info.get()->validity = MD_BREAKPAD_INFO_VALID_DUMP_THREAD_ID |
MD_BREAKPAD_INFO_VALID_REQUESTING_THREAD_ID;
info.get()->dump_thread_id = getpid();
info.get()->requesting_thread_id = writer_args->requester_pid;
return true;
}
// Prototype of writer functions.
typedef bool (*WriteStringFN)(MinidumpFileWriter *,
const WriterArgument *,
MDRawDirectory *);
// Function table to writer a full minidump.
WriteStringFN writers[] = {
WriteThreadListStream,
WriteModuleListStream,
WriteSystemInfoStream,
WriteExceptionStream,
WriteMiscInfoStream,
WriteBreakpadInfoStream,
};
// Will call each writer function in the writers table.
// It runs in a different process from the crashing process, but sharing
// the same address space. This enables it to use ptrace functions.
int Write(void *argument) {
WriterArgument *writer_args =
static_cast<WriterArgument *>(argument);
if (!writer_args->thread_lister->SuspendAllThreads())
return -1;
if (writer_args->sighandler_ebp != 0 &&
writer_args->thread_lister->FindSigContext(writer_args->sighandler_ebp,
&writer_args->sig_ctx)) {
writer_args->crashed_stack_bottom =
writer_args->thread_lister->GetThreadStackBottom(
writer_args->sig_ctx->ebp);
int crashed_pid = FindCrashingThread(writer_args->crashed_stack_bottom,
writer_args->requester_pid,
writer_args->thread_lister);
if (crashed_pid > 0)
writer_args->crashed_pid = crashed_pid;
}
MinidumpFileWriter *minidump_writer = writer_args->minidump_writer;
TypedMDRVA<MDRawHeader> header(minidump_writer);
TypedMDRVA<MDRawDirectory> dir(minidump_writer);
if (!header.Allocate())
return 0;
int writer_count = sizeof(writers) / sizeof(writers[0]);
// Need directory space for all writers.
if (!dir.AllocateArray(writer_count))
return 0;
header.get()->signature = MD_HEADER_SIGNATURE;
header.get()->version = MD_HEADER_VERSION;
header.get()->time_date_stamp = time(NULL);
header.get()->stream_count = writer_count;
header.get()->stream_directory_rva = dir.position();
int dir_index = 0;
MDRawDirectory local_dir;
for (int i = 0; i < writer_count; ++i) {
if (writers[i](minidump_writer, writer_args, &local_dir))
dir.CopyIndex(dir_index++, &local_dir);
}
writer_args->thread_lister->ResumeAllThreads();
return 0;
}
} // namespace
namespace google_breakpad {
MinidumpGenerator::MinidumpGenerator() {
AllocateStack();
}
MinidumpGenerator::~MinidumpGenerator() {
}
void MinidumpGenerator::AllocateStack() {
stack_.reset(new char[kStackSize]);
}
bool MinidumpGenerator::WriteMinidumpToFile(const char *file_pathname,
int signo,
uintptr_t sighandler_ebp,
struct sigcontext **sig_ctx) const {
assert(file_pathname != NULL);
assert(stack_ != NULL);
if (stack_ == NULL || file_pathname == NULL)
return false;
MinidumpFileWriter minidump_writer;
if (minidump_writer.Open(file_pathname)) {
WriterArgument argument;
memset(&argument, 0, sizeof(argument));
LinuxThread thread_lister(getpid());
argument.thread_lister = &thread_lister;
argument.minidump_writer = &minidump_writer;
argument.requester_pid = getpid();
argument.crashed_pid = getpid();
argument.signo = signo;
argument.sighandler_ebp = sighandler_ebp;
argument.sig_ctx = NULL;
int cloned_pid = clone(Write, stack_.get() + kStackSize,
CLONE_VM | CLONE_FILES | CLONE_FS | CLONE_UNTRACED,
(void*)&argument);
waitpid(cloned_pid, NULL, __WALL);
if (sig_ctx != NULL)
*sig_ctx = argument.sig_ctx;
return true;
}
return false;
}
} // namespace google_breakpad
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