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android_system_core/debuggerd/libdebuggerd/tombstone.cpp
Christopher Ferris b7de5f5429 Demand read load bias for a map. 
Add a static GetLoadBias method to the Elf object that only reads just
enough to get the load bias.

Add a method to MapInfo that gets the load bias. First attempt to get
it if the elf object already exists. If no elf object was created, use
the new static method to get the load bias.

In BacktraceMap, add a custom iterator so that when code dereferences
a map element, that's when the load bias will be retrieved if it hasn't
already been set.

Bug: 69871050

Test: New unit tests, verify tombstones have non-zero load bias values for
Test: libraries with a non-zero load bias.
Change-Id: I125f4abc827589957fce2f0df24b0f25d037d732
2017-12-05 13:12:47 -08:00

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/*
* Copyright (C) 2012-2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "DEBUG"
#include "libdebuggerd/tombstone.h"
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <signal.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ptrace.h>
#include <sys/stat.h>
#include <time.h>
#include <memory>
#include <string>
#include <android-base/file.h>
#include <android-base/properties.h>
#include <android-base/stringprintf.h>
#include <android-base/unique_fd.h>
#include <android/log.h>
#include <backtrace/Backtrace.h>
#include <backtrace/BacktraceMap.h>
#include <log/log.h>
#include <log/logprint.h>
#include <private/android_filesystem_config.h>
// Needed to get DEBUGGER_SIGNAL.
#include "debuggerd/handler.h"
#include "libdebuggerd/backtrace.h"
#include "libdebuggerd/elf_utils.h"
#include "libdebuggerd/machine.h"
#include "libdebuggerd/open_files_list.h"
using android::base::GetBoolProperty;
using android::base::GetProperty;
using android::base::StringPrintf;
#define STACK_WORDS 16
static bool signal_has_si_addr(int si_signo, int si_code) {
// Manually sent signals won't have si_addr.
if (si_code == SI_USER || si_code == SI_QUEUE || si_code == SI_TKILL) {
return false;
}
switch (si_signo) {
case SIGBUS:
case SIGFPE:
case SIGILL:
case SIGSEGV:
case SIGTRAP:
return true;
default:
return false;
}
}
static const char* get_signame(int sig) {
switch (sig) {
case SIGABRT: return "SIGABRT";
case SIGBUS: return "SIGBUS";
case SIGFPE: return "SIGFPE";
case SIGILL: return "SIGILL";
case SIGSEGV: return "SIGSEGV";
#if defined(SIGSTKFLT)
case SIGSTKFLT: return "SIGSTKFLT";
#endif
case SIGSTOP: return "SIGSTOP";
case SIGSYS: return "SIGSYS";
case SIGTRAP: return "SIGTRAP";
case DEBUGGER_SIGNAL: return "<debuggerd signal>";
default: return "?";
}
}
static const char* get_sigcode(int signo, int code) {
// Try the signal-specific codes...
switch (signo) {
case SIGILL:
switch (code) {
case ILL_ILLOPC: return "ILL_ILLOPC";
case ILL_ILLOPN: return "ILL_ILLOPN";
case ILL_ILLADR: return "ILL_ILLADR";
case ILL_ILLTRP: return "ILL_ILLTRP";
case ILL_PRVOPC: return "ILL_PRVOPC";
case ILL_PRVREG: return "ILL_PRVREG";
case ILL_COPROC: return "ILL_COPROC";
case ILL_BADSTK: return "ILL_BADSTK";
}
static_assert(NSIGILL == ILL_BADSTK, "missing ILL_* si_code");
break;
case SIGBUS:
switch (code) {
case BUS_ADRALN: return "BUS_ADRALN";
case BUS_ADRERR: return "BUS_ADRERR";
case BUS_OBJERR: return "BUS_OBJERR";
case BUS_MCEERR_AR: return "BUS_MCEERR_AR";
case BUS_MCEERR_AO: return "BUS_MCEERR_AO";
}
static_assert(NSIGBUS == BUS_MCEERR_AO, "missing BUS_* si_code");
break;
case SIGFPE:
switch (code) {
case FPE_INTDIV: return "FPE_INTDIV";
case FPE_INTOVF: return "FPE_INTOVF";
case FPE_FLTDIV: return "FPE_FLTDIV";
case FPE_FLTOVF: return "FPE_FLTOVF";
case FPE_FLTUND: return "FPE_FLTUND";
case FPE_FLTRES: return "FPE_FLTRES";
case FPE_FLTINV: return "FPE_FLTINV";
case FPE_FLTSUB: return "FPE_FLTSUB";
}
static_assert(NSIGFPE == FPE_FLTSUB, "missing FPE_* si_code");
break;
case SIGSEGV:
switch (code) {
case SEGV_MAPERR: return "SEGV_MAPERR";
case SEGV_ACCERR: return "SEGV_ACCERR";
#if defined(SEGV_BNDERR)
case SEGV_BNDERR: return "SEGV_BNDERR";
#endif
#if defined(SEGV_PKUERR)
case SEGV_PKUERR: return "SEGV_PKUERR";
#endif
}
#if defined(SEGV_PKUERR)
static_assert(NSIGSEGV == SEGV_PKUERR, "missing SEGV_* si_code");
#elif defined(SEGV_BNDERR)
static_assert(NSIGSEGV == SEGV_BNDERR, "missing SEGV_* si_code");
#else
static_assert(NSIGSEGV == SEGV_ACCERR, "missing SEGV_* si_code");
#endif
break;
#if defined(SYS_SECCOMP) // Our glibc is too old, and we build this for the host too.
case SIGSYS:
switch (code) {
case SYS_SECCOMP: return "SYS_SECCOMP";
}
static_assert(NSIGSYS == SYS_SECCOMP, "missing SYS_* si_code");
break;
#endif
case SIGTRAP:
switch (code) {
case TRAP_BRKPT: return "TRAP_BRKPT";
case TRAP_TRACE: return "TRAP_TRACE";
case TRAP_BRANCH: return "TRAP_BRANCH";
case TRAP_HWBKPT: return "TRAP_HWBKPT";
}
if ((code & 0xff) == SIGTRAP) {
switch ((code >> 8) & 0xff) {
case PTRACE_EVENT_FORK:
return "PTRACE_EVENT_FORK";
case PTRACE_EVENT_VFORK:
return "PTRACE_EVENT_VFORK";
case PTRACE_EVENT_CLONE:
return "PTRACE_EVENT_CLONE";
case PTRACE_EVENT_EXEC:
return "PTRACE_EVENT_EXEC";
case PTRACE_EVENT_VFORK_DONE:
return "PTRACE_EVENT_VFORK_DONE";
case PTRACE_EVENT_EXIT:
return "PTRACE_EVENT_EXIT";
case PTRACE_EVENT_SECCOMP:
return "PTRACE_EVENT_SECCOMP";
case PTRACE_EVENT_STOP:
return "PTRACE_EVENT_STOP";
}
}
static_assert(NSIGTRAP == TRAP_HWBKPT, "missing TRAP_* si_code");
break;
}
// Then the other codes...
switch (code) {
case SI_USER: return "SI_USER";
case SI_KERNEL: return "SI_KERNEL";
case SI_QUEUE: return "SI_QUEUE";
case SI_TIMER: return "SI_TIMER";
case SI_MESGQ: return "SI_MESGQ";
case SI_ASYNCIO: return "SI_ASYNCIO";
case SI_SIGIO: return "SI_SIGIO";
case SI_TKILL: return "SI_TKILL";
case SI_DETHREAD: return "SI_DETHREAD";
}
// Then give up...
return "?";
}
static void dump_header_info(log_t* log) {
auto fingerprint = GetProperty("ro.build.fingerprint", "unknown");
auto revision = GetProperty("ro.revision", "unknown");
_LOG(log, logtype::HEADER, "Build fingerprint: '%s'\n", fingerprint.c_str());
_LOG(log, logtype::HEADER, "Revision: '%s'\n", revision.c_str());
_LOG(log, logtype::HEADER, "ABI: '%s'\n", ABI_STRING);
}
static void dump_probable_cause(log_t* log, const siginfo_t& si) {
std::string cause;
if (si.si_signo == SIGSEGV && si.si_code == SEGV_MAPERR) {
if (si.si_addr < reinterpret_cast<void*>(4096)) {
cause = StringPrintf("null pointer dereference");
} else if (si.si_addr == reinterpret_cast<void*>(0xffff0ffc)) {
cause = "call to kuser_helper_version";
} else if (si.si_addr == reinterpret_cast<void*>(0xffff0fe0)) {
cause = "call to kuser_get_tls";
} else if (si.si_addr == reinterpret_cast<void*>(0xffff0fc0)) {
cause = "call to kuser_cmpxchg";
} else if (si.si_addr == reinterpret_cast<void*>(0xffff0fa0)) {
cause = "call to kuser_memory_barrier";
} else if (si.si_addr == reinterpret_cast<void*>(0xffff0f60)) {
cause = "call to kuser_cmpxchg64";
}
} else if (si.si_signo == SIGSYS && si.si_code == SYS_SECCOMP) {
cause = StringPrintf("seccomp prevented call to disallowed %s system call %d",
ABI_STRING, si.si_syscall);
}
if (!cause.empty()) _LOG(log, logtype::HEADER, "Cause: %s\n", cause.c_str());
}
static void dump_signal_info(log_t* log, const siginfo_t* siginfo) {
const siginfo_t& si = *siginfo;
char addr_desc[32]; // ", fault addr 0x1234"
if (signal_has_si_addr(si.si_signo, si.si_code)) {
snprintf(addr_desc, sizeof(addr_desc), "%p", si.si_addr);
} else {
snprintf(addr_desc, sizeof(addr_desc), "--------");
}
_LOG(log, logtype::HEADER, "signal %d (%s), code %d (%s), fault addr %s\n", si.si_signo,
get_signame(si.si_signo), si.si_code, get_sigcode(si.si_signo, si.si_code), addr_desc);
dump_probable_cause(log, si);
}
static void dump_signal_info(log_t* log, pid_t tid) {
siginfo_t si;
memset(&si, 0, sizeof(si));
if (ptrace(PTRACE_GETSIGINFO, tid, 0, &si) == -1) {
ALOGE("cannot get siginfo: %s\n", strerror(errno));
return;
}
dump_signal_info(log, &si);
}
static void dump_thread_info(log_t* log, pid_t pid, pid_t tid, const char* process_name,
const char* thread_name) {
// Blacklist logd, logd.reader, logd.writer, logd.auditd, logd.control ...
// TODO: Why is this controlled by thread name?
if (strcmp(thread_name, "logd") == 0 || strncmp(thread_name, "logd.", 4) == 0) {
log->should_retrieve_logcat = false;
}
_LOG(log, logtype::HEADER, "pid: %d, tid: %d, name: %s >>> %s <<<\n", pid, tid, thread_name,
process_name);
}
static void dump_stack_segment(
Backtrace* backtrace, log_t* log, uintptr_t* sp, size_t words, int label) {
// Read the data all at once.
word_t stack_data[words];
size_t bytes_read = backtrace->Read(*sp, reinterpret_cast<uint8_t*>(&stack_data[0]), sizeof(word_t) * words);
words = bytes_read / sizeof(word_t);
std::string line;
for (size_t i = 0; i < words; i++) {
line = " ";
if (i == 0 && label >= 0) {
// Print the label once.
line += StringPrintf("#%02d ", label);
} else {
line += " ";
}
line += StringPrintf("%" PRIPTR " %" PRIPTR, *sp, stack_data[i]);
backtrace_map_t map;
backtrace->FillInMap(stack_data[i], &map);
if (BacktraceMap::IsValid(map) && !map.name.empty()) {
line += " " + map.name;
uintptr_t offset = 0;
std::string func_name(backtrace->GetFunctionName(stack_data[i], &offset, &map));
if (!func_name.empty()) {
line += " (" + func_name;
if (offset) {
line += StringPrintf("+%" PRIuPTR, offset);
}
line += ')';
}
}
_LOG(log, logtype::STACK, "%s\n", line.c_str());
*sp += sizeof(word_t);
}
}
static void dump_stack(Backtrace* backtrace, log_t* log) {
size_t first = 0, last;
for (size_t i = 0; i < backtrace->NumFrames(); i++) {
const backtrace_frame_data_t* frame = backtrace->GetFrame(i);
if (frame->sp) {
if (!first) {
first = i+1;
}
last = i;
}
}
if (!first) {
return;
}
first--;
// Dump a few words before the first frame.
word_t sp = backtrace->GetFrame(first)->sp - STACK_WORDS * sizeof(word_t);
dump_stack_segment(backtrace, log, &sp, STACK_WORDS, -1);
// Dump a few words from all successive frames.
// Only log the first 3 frames, put the rest in the tombstone.
for (size_t i = first; i <= last; i++) {
const backtrace_frame_data_t* frame = backtrace->GetFrame(i);
if (sp != frame->sp) {
_LOG(log, logtype::STACK, " ........ ........\n");
sp = frame->sp;
}
if (i == last) {
dump_stack_segment(backtrace, log, &sp, STACK_WORDS, i);
if (sp < frame->sp + frame->stack_size) {
_LOG(log, logtype::STACK, " ........ ........\n");
}
} else {
size_t words = frame->stack_size / sizeof(word_t);
if (words == 0) {
words = 1;
} else if (words > STACK_WORDS) {
words = STACK_WORDS;
}
dump_stack_segment(backtrace, log, &sp, words, i);
}
}
}
static std::string get_addr_string(uintptr_t addr) {
std::string addr_str;
#if defined(__LP64__)
addr_str = StringPrintf("%08x'%08x",
static_cast<uint32_t>(addr >> 32),
static_cast<uint32_t>(addr & 0xffffffff));
#else
addr_str = StringPrintf("%08x", addr);
#endif
return addr_str;
}
static void dump_abort_message(Backtrace* backtrace, log_t* log, uintptr_t address) {
if (address == 0) {
return;
}
address += sizeof(size_t); // Skip the buffer length.
char msg[512];
memset(msg, 0, sizeof(msg));
char* p = &msg[0];
while (p < &msg[sizeof(msg)]) {
word_t data;
size_t len = sizeof(word_t);
if (!backtrace->ReadWord(address, &data)) {
break;
}
address += sizeof(word_t);
while (len > 0 && (*p++ = (data >> (sizeof(word_t) - len) * 8) & 0xff) != 0) {
len--;
}
}
msg[sizeof(msg) - 1] = '\0';
_LOG(log, logtype::HEADER, "Abort message: '%s'\n", msg);
}
static void dump_all_maps(Backtrace* backtrace, BacktraceMap* map, log_t* log, pid_t tid) {
bool print_fault_address_marker = false;
uintptr_t addr = 0;
siginfo_t si;
memset(&si, 0, sizeof(si));
if (ptrace(PTRACE_GETSIGINFO, tid, 0, &si) != -1) {
print_fault_address_marker = signal_has_si_addr(si.si_signo, si.si_code);
addr = reinterpret_cast<uintptr_t>(si.si_addr);
} else {
ALOGE("Cannot get siginfo for %d: %s\n", tid, strerror(errno));
}
ScopedBacktraceMapIteratorLock lock(map);
_LOG(log, logtype::MAPS,
"\n"
"memory map (%zu entr%s):",
map->size(), map->size() == 1 ? "y" : "ies");
if (print_fault_address_marker) {
if (map->begin() != map->end() && addr < (*map->begin())->start) {
_LOG(log, logtype::MAPS, "\n--->Fault address falls at %s before any mapped regions\n",
get_addr_string(addr).c_str());
print_fault_address_marker = false;
} else {
_LOG(log, logtype::MAPS, " (fault address prefixed with --->)\n");
}
} else {
_LOG(log, logtype::MAPS, "\n");
}
std::string line;
for (auto it = map->begin(); it != map->end(); ++it) {
const backtrace_map_t* entry = *it;
line = " ";
if (print_fault_address_marker) {
if (addr < entry->start) {
_LOG(log, logtype::MAPS, "--->Fault address falls at %s between mapped regions\n",
get_addr_string(addr).c_str());
print_fault_address_marker = false;
} else if (addr >= entry->start && addr < entry->end) {
line = "--->";
print_fault_address_marker = false;
}
}
line += get_addr_string(entry->start) + '-' + get_addr_string(entry->end - 1) + ' ';
if (entry->flags & PROT_READ) {
line += 'r';
} else {
line += '-';
}
if (entry->flags & PROT_WRITE) {
line += 'w';
} else {
line += '-';
}
if (entry->flags & PROT_EXEC) {
line += 'x';
} else {
line += '-';
}
line += StringPrintf(" %8" PRIxPTR " %8" PRIxPTR, entry->offset, entry->end - entry->start);
bool space_needed = true;
if (entry->name.length() > 0) {
space_needed = false;
line += " " + entry->name;
std::string build_id;
if ((entry->flags & PROT_READ) && elf_get_build_id(backtrace, entry->start, &build_id)) {
line += " (BuildId: " + build_id + ")";
}
}
if (entry->load_bias != 0) {
if (space_needed) {
line += ' ';
}
line += StringPrintf(" (load bias 0x%" PRIxPTR ")", entry->load_bias);
}
_LOG(log, logtype::MAPS, "%s\n", line.c_str());
}
if (print_fault_address_marker) {
_LOG(log, logtype::MAPS, "--->Fault address falls at %s after any mapped regions\n",
get_addr_string(addr).c_str());
}
}
static void dump_backtrace_and_stack(Backtrace* backtrace, log_t* log) {
if (backtrace->NumFrames()) {
_LOG(log, logtype::BACKTRACE, "\nbacktrace:\n");
dump_backtrace_to_log(backtrace, log, " ");
_LOG(log, logtype::STACK, "\nstack:\n");
dump_stack(backtrace, log);
}
}
// Weak noop implementation, real implementations are in <arch>/machine.cpp.
__attribute__((weak)) void dump_registers(log_t* log, const ucontext_t*) {
_LOG(log, logtype::REGISTERS, " register dumping unimplemented on this architecture");
}
static void dump_thread(log_t* log, pid_t pid, pid_t tid, const std::string& process_name,
const std::string& thread_name, BacktraceMap* map,
uintptr_t abort_msg_address, bool primary_thread) {
log->current_tid = tid;
if (!primary_thread) {
_LOG(log, logtype::THREAD, "--- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---\n");
}
dump_thread_info(log, pid, tid, process_name.c_str(), thread_name.c_str());
dump_signal_info(log, tid);
std::unique_ptr<Backtrace> backtrace(Backtrace::Create(pid, tid, map));
if (primary_thread) {
dump_abort_message(backtrace.get(), log, abort_msg_address);
}
dump_registers(log, tid);
if (backtrace->Unwind(0)) {
dump_backtrace_and_stack(backtrace.get(), log);
} else {
ALOGE("Unwind failed: pid = %d, tid = %d", pid, tid);
}
if (primary_thread) {
dump_memory_and_code(log, backtrace.get());
if (map) {
dump_all_maps(backtrace.get(), map, log, tid);
}
}
log->current_tid = log->crashed_tid;
}
// Reads the contents of the specified log device, filters out the entries
// that don't match the specified pid, and writes them to the tombstone file.
//
// If "tail" is non-zero, log the last "tail" number of lines.
static EventTagMap* g_eventTagMap = NULL;
static void dump_log_file(
log_t* log, pid_t pid, const char* filename, unsigned int tail) {
bool first = true;
struct logger_list* logger_list;
if (!log->should_retrieve_logcat) {
return;
}
logger_list = android_logger_list_open(
android_name_to_log_id(filename), ANDROID_LOG_RDONLY | ANDROID_LOG_NONBLOCK, tail, pid);
if (!logger_list) {
ALOGE("Unable to open %s: %s\n", filename, strerror(errno));
return;
}
struct log_msg log_entry;
while (true) {
ssize_t actual = android_logger_list_read(logger_list, &log_entry);
struct logger_entry* entry;
if (actual < 0) {
if (actual == -EINTR) {
// interrupted by signal, retry
continue;
} else if (actual == -EAGAIN) {
// non-blocking EOF; we're done
break;
} else {
ALOGE("Error while reading log: %s\n", strerror(-actual));
break;
}
} else if (actual == 0) {
ALOGE("Got zero bytes while reading log: %s\n", strerror(errno));
break;
}
// NOTE: if you ALOGV something here, this will spin forever,
// because you will be writing as fast as you're reading. Any
// high-frequency debug diagnostics should just be written to
// the tombstone file.
entry = &log_entry.entry_v1;
if (first) {
_LOG(log, logtype::LOGS, "--------- %slog %s\n",
tail ? "tail end of " : "", filename);
first = false;
}
// Msg format is: <priority:1><tag:N>\0<message:N>\0
//
// We want to display it in the same format as "logcat -v threadtime"
// (although in this case the pid is redundant).
static const char* kPrioChars = "!.VDIWEFS";
unsigned hdr_size = log_entry.entry.hdr_size;
if (!hdr_size) {
hdr_size = sizeof(log_entry.entry_v1);
}
if ((hdr_size < sizeof(log_entry.entry_v1)) ||
(hdr_size > sizeof(log_entry.entry))) {
continue;
}
char* msg = reinterpret_cast<char*>(log_entry.buf) + hdr_size;
char timeBuf[32];
time_t sec = static_cast<time_t>(entry->sec);
struct tm tmBuf;
struct tm* ptm;
ptm = localtime_r(&sec, &tmBuf);
strftime(timeBuf, sizeof(timeBuf), "%m-%d %H:%M:%S", ptm);
if (log_entry.id() == LOG_ID_EVENTS) {
if (!g_eventTagMap) {
g_eventTagMap = android_openEventTagMap(NULL);
}
AndroidLogEntry e;
char buf[512];
android_log_processBinaryLogBuffer(entry, &e, g_eventTagMap, buf, sizeof(buf));
_LOG(log, logtype::LOGS, "%s.%03d %5d %5d %c %-8.*s: %s\n",
timeBuf, entry->nsec / 1000000, entry->pid, entry->tid,
'I', (int)e.tagLen, e.tag, e.message);
continue;
}
unsigned char prio = msg[0];
char* tag = msg + 1;
msg = tag + strlen(tag) + 1;
// consume any trailing newlines
char* nl = msg + strlen(msg) - 1;
while (nl >= msg && *nl == '\n') {
*nl-- = '\0';
}
char prioChar = (prio < strlen(kPrioChars) ? kPrioChars[prio] : '?');
// Look for line breaks ('\n') and display each text line
// on a separate line, prefixed with the header, like logcat does.
do {
nl = strchr(msg, '\n');
if (nl) {
*nl = '\0';
++nl;
}
_LOG(log, logtype::LOGS, "%s.%03d %5d %5d %c %-8s: %s\n",
timeBuf, entry->nsec / 1000000, entry->pid, entry->tid,
prioChar, tag, msg);
} while ((msg = nl));
}
android_logger_list_free(logger_list);
}
// Dumps the logs generated by the specified pid to the tombstone, from both
// "system" and "main" log devices. Ideally we'd interleave the output.
static void dump_logs(log_t* log, pid_t pid, unsigned int tail) {
dump_log_file(log, pid, "system", tail);
dump_log_file(log, pid, "main", tail);
}
// Dumps all information about the specified pid to the tombstone.
static void dump_crash(log_t* log, BacktraceMap* map, const OpenFilesList* open_files, pid_t pid,
pid_t tid, const std::string& process_name,
const std::map<pid_t, std::string>& threads, uintptr_t abort_msg_address) {
// don't copy log messages to tombstone unless this is a dev device
bool want_logs = GetBoolProperty("ro.debuggable", false);
_LOG(log, logtype::HEADER,
"*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***\n");
dump_header_info(log);
dump_thread(log, pid, tid, process_name, threads.find(tid)->second, map, abort_msg_address, true);
if (want_logs) {
dump_logs(log, pid, 5);
}
for (const auto& it : threads) {
pid_t thread_tid = it.first;
const std::string& thread_name = it.second;
if (thread_tid != tid) {
dump_thread(log, pid, thread_tid, process_name, thread_name, map, 0, false);
}
}
if (open_files) {
_LOG(log, logtype::OPEN_FILES, "\nopen files:\n");
dump_open_files_list_to_log(*open_files, log, " ");
}
if (want_logs) {
dump_logs(log, pid, 0);
}
}
void engrave_tombstone(int tombstone_fd, BacktraceMap* map, const OpenFilesList* open_files,
pid_t pid, pid_t tid, const std::string& process_name,
const std::map<pid_t, std::string>& threads, uintptr_t abort_msg_address,
std::string* amfd_data) {
log_t log;
log.current_tid = tid;
log.crashed_tid = tid;
log.tfd = tombstone_fd;
log.amfd_data = amfd_data;
dump_crash(&log, map, open_files, pid, tid, process_name, threads, abort_msg_address);
}
void engrave_tombstone_ucontext(int tombstone_fd, uintptr_t abort_msg_address, siginfo_t* siginfo,
ucontext_t* ucontext) {
pid_t pid = getpid();
pid_t tid = gettid();
log_t log;
log.current_tid = tid;
log.crashed_tid = tid;
log.tfd = tombstone_fd;
log.amfd_data = nullptr;
char thread_name[16];
char process_name[128];
read_with_default("/proc/self/comm", thread_name, sizeof(thread_name), "<unknown>");
read_with_default("/proc/self/cmdline", process_name, sizeof(process_name), "<unknown>");
_LOG(&log, logtype::HEADER, "*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***\n");
dump_header_info(&log);
dump_thread_info(&log, pid, tid, thread_name, process_name);
dump_signal_info(&log, siginfo);
std::unique_ptr<Backtrace> backtrace(Backtrace::Create(pid, tid));
dump_abort_message(backtrace.get(), &log, abort_msg_address);
dump_registers(&log, ucontext);
if (backtrace->Unwind(0, ucontext)) {
dump_backtrace_and_stack(backtrace.get(), &log);
} else {
ALOGE("Unwind failed: pid = %d, tid = %d", pid, tid);
}
// TODO: Make this match the format of dump_all_maps above.
_LOG(&log, logtype::MAPS, "memory map:\n");
android::base::unique_fd maps_fd(open("/proc/self/maps", O_RDONLY | O_CLOEXEC));
if (maps_fd == -1) {
_LOG(&log, logtype::MAPS, " failed to open /proc/self/maps: %s", strerror(errno));
} else {
char buf[256];
ssize_t rc;
while ((rc = TEMP_FAILURE_RETRY(read(maps_fd.get(), buf, sizeof(buf)))) > 0) {
android::base::WriteFully(tombstone_fd, buf, rc);
}
}
}
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