| /* |
| * Copyright (C) 2012 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. |
| */ |
| |
| #include <stddef.h> |
| #include <stdbool.h> |
| #include <stdlib.h> |
| #include <signal.h> |
| #include <string.h> |
| #include <stdio.h> |
| #include <fcntl.h> |
| #include <errno.h> |
| #include <dirent.h> |
| #include <time.h> |
| #include <sys/ptrace.h> |
| #include <sys/stat.h> |
| |
| #include <private/android_filesystem_config.h> |
| |
| #include <cutils/logger.h> |
| #include <cutils/properties.h> |
| |
| #include <corkscrew/demangle.h> |
| #include <corkscrew/backtrace.h> |
| |
| #include <sys/socket.h> |
| #include <linux/un.h> |
| |
| #include <selinux/android.h> |
| |
| #include "machine.h" |
| #include "tombstone.h" |
| #include "utility.h" |
| |
| #define STACK_DEPTH 32 |
| #define STACK_WORDS 16 |
| |
| #define MAX_TOMBSTONES 10 |
| #define TOMBSTONE_DIR "/data/tombstones" |
| |
| /* Must match the path defined in NativeCrashListener.java */ |
| #define NCRASH_SOCKET_PATH "/data/system/ndebugsocket" |
| |
| #define typecheck(x,y) { \ |
| typeof(x) __dummy1; \ |
| typeof(y) __dummy2; \ |
| (void)(&__dummy1 == &__dummy2); } |
| |
| |
| static bool signal_has_address(int sig) { |
| switch (sig) { |
| case SIGILL: |
| case SIGFPE: |
| case SIGSEGV: |
| case SIGBUS: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| static const char *get_signame(int sig) |
| { |
| switch(sig) { |
| case SIGILL: return "SIGILL"; |
| case SIGABRT: return "SIGABRT"; |
| case SIGBUS: return "SIGBUS"; |
| case SIGFPE: return "SIGFPE"; |
| case SIGSEGV: return "SIGSEGV"; |
| case SIGPIPE: return "SIGPIPE"; |
| #ifdef SIGSTKFLT |
| case SIGSTKFLT: return "SIGSTKFLT"; |
| #endif |
| case SIGSTOP: return "SIGSTOP"; |
| 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"; |
| } |
| break; |
| case SIGBUS: |
| switch (code) { |
| case BUS_ADRALN: return "BUS_ADRALN"; |
| case BUS_ADRERR: return "BUS_ADRERR"; |
| case BUS_OBJERR: return "BUS_OBJERR"; |
| } |
| 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"; |
| } |
| break; |
| case SIGSEGV: |
| switch (code) { |
| case SEGV_MAPERR: return "SEGV_MAPERR"; |
| case SEGV_ACCERR: return "SEGV_ACCERR"; |
| } |
| break; |
| case SIGTRAP: |
| switch (code) { |
| case TRAP_BRKPT: return "TRAP_BRKPT"; |
| case TRAP_TRACE: return "TRAP_TRACE"; |
| } |
| break; |
| } |
| // Then the other codes... |
| switch (code) { |
| case SI_USER: return "SI_USER"; |
| #if defined(SI_KERNEL) |
| case SI_KERNEL: return "SI_KERNEL"; |
| #endif |
| case SI_QUEUE: return "SI_QUEUE"; |
| case SI_TIMER: return "SI_TIMER"; |
| case SI_MESGQ: return "SI_MESGQ"; |
| case SI_ASYNCIO: return "SI_ASYNCIO"; |
| #if defined(SI_SIGIO) |
| case SI_SIGIO: return "SI_SIGIO"; |
| #endif |
| #if defined(SI_TKILL) |
| case SI_TKILL: return "SI_TKILL"; |
| #endif |
| } |
| // Then give up... |
| return "?"; |
| } |
| |
| static void dump_revision_info(log_t* log) |
| { |
| char revision[PROPERTY_VALUE_MAX]; |
| |
| property_get("ro.revision", revision, "unknown"); |
| |
| _LOG(log, SCOPE_AT_FAULT, "Revision: '%s'\n", revision); |
| } |
| |
| static void dump_build_info(log_t* log) |
| { |
| char fingerprint[PROPERTY_VALUE_MAX]; |
| |
| property_get("ro.build.fingerprint", fingerprint, "unknown"); |
| |
| _LOG(log, SCOPE_AT_FAULT, "Build fingerprint: '%s'\n", fingerprint); |
| } |
| |
| static void dump_fault_addr(log_t* log, pid_t tid, int sig) |
| { |
| siginfo_t si; |
| |
| memset(&si, 0, sizeof(si)); |
| if(ptrace(PTRACE_GETSIGINFO, tid, 0, &si)){ |
| _LOG(log, SCOPE_AT_FAULT, "cannot get siginfo: %s\n", strerror(errno)); |
| } else if (signal_has_address(sig)) { |
| _LOG(log, SCOPE_AT_FAULT, "signal %d (%s), code %d (%s), fault addr %08x\n", |
| sig, get_signame(sig), |
| si.si_code, get_sigcode(sig, si.si_code), |
| (uintptr_t) si.si_addr); |
| } else { |
| _LOG(log, SCOPE_AT_FAULT, "signal %d (%s), code %d (%s), fault addr --------\n", |
| sig, get_signame(sig), si.si_code, get_sigcode(sig, si.si_code)); |
| } |
| } |
| |
| static void dump_thread_info(log_t* log, pid_t pid, pid_t tid, bool at_fault) { |
| char path[64]; |
| char threadnamebuf[1024]; |
| char* threadname = NULL; |
| FILE *fp; |
| |
| snprintf(path, sizeof(path), "/proc/%d/comm", tid); |
| if ((fp = fopen(path, "r"))) { |
| threadname = fgets(threadnamebuf, sizeof(threadnamebuf), fp); |
| fclose(fp); |
| if (threadname) { |
| size_t len = strlen(threadname); |
| if (len && threadname[len - 1] == '\n') { |
| threadname[len - 1] = '\0'; |
| } |
| } |
| } |
| |
| if (at_fault) { |
| char procnamebuf[1024]; |
| char* procname = NULL; |
| |
| snprintf(path, sizeof(path), "/proc/%d/cmdline", pid); |
| if ((fp = fopen(path, "r"))) { |
| procname = fgets(procnamebuf, sizeof(procnamebuf), fp); |
| fclose(fp); |
| } |
| |
| _LOG(log, SCOPE_AT_FAULT, "pid: %d, tid: %d, name: %s >>> %s <<<\n", pid, tid, |
| threadname ? threadname : "UNKNOWN", |
| procname ? procname : "UNKNOWN"); |
| } else { |
| _LOG(log, 0, "pid: %d, tid: %d, name: %s\n", |
| pid, tid, threadname ? threadname : "UNKNOWN"); |
| } |
| } |
| |
| static void dump_backtrace(const ptrace_context_t* context __attribute((unused)), |
| log_t* log, pid_t tid __attribute((unused)), bool at_fault, |
| const backtrace_frame_t* backtrace, size_t frames) { |
| int scopeFlags = at_fault ? SCOPE_AT_FAULT : 0; |
| _LOG(log, scopeFlags, "\nbacktrace:\n"); |
| |
| backtrace_symbol_t backtrace_symbols[STACK_DEPTH]; |
| get_backtrace_symbols_ptrace(context, backtrace, frames, backtrace_symbols); |
| for (size_t i = 0; i < frames; i++) { |
| char line[MAX_BACKTRACE_LINE_LENGTH]; |
| format_backtrace_line(i, &backtrace[i], &backtrace_symbols[i], |
| line, MAX_BACKTRACE_LINE_LENGTH); |
| _LOG(log, scopeFlags, " %s\n", line); |
| } |
| free_backtrace_symbols(backtrace_symbols, frames); |
| } |
| |
| static void dump_stack_segment(const ptrace_context_t* context, log_t* log, pid_t tid, |
| int scopeFlags, uintptr_t* sp, size_t words, int label) { |
| for (size_t i = 0; i < words; i++) { |
| uint32_t stack_content; |
| if (!try_get_word_ptrace(tid, *sp, &stack_content)) { |
| break; |
| } |
| |
| const map_info_t* mi; |
| const symbol_t* symbol; |
| find_symbol_ptrace(context, stack_content, &mi, &symbol); |
| |
| if (symbol) { |
| char* demangled_name = demangle_symbol_name(symbol->name); |
| const char* symbol_name = demangled_name ? demangled_name : symbol->name; |
| uint32_t offset = stack_content - (mi->start + symbol->start); |
| if (!i && label >= 0) { |
| if (offset) { |
| _LOG(log, scopeFlags, " #%02d %08x %08x %s (%s+%u)\n", |
| label, *sp, stack_content, mi ? mi->name : "", symbol_name, offset); |
| } else { |
| _LOG(log, scopeFlags, " #%02d %08x %08x %s (%s)\n", |
| label, *sp, stack_content, mi ? mi->name : "", symbol_name); |
| } |
| } else { |
| if (offset) { |
| _LOG(log, scopeFlags, " %08x %08x %s (%s+%u)\n", |
| *sp, stack_content, mi ? mi->name : "", symbol_name, offset); |
| } else { |
| _LOG(log, scopeFlags, " %08x %08x %s (%s)\n", |
| *sp, stack_content, mi ? mi->name : "", symbol_name); |
| } |
| } |
| free(demangled_name); |
| } else { |
| if (!i && label >= 0) { |
| _LOG(log, scopeFlags, " #%02d %08x %08x %s\n", |
| label, *sp, stack_content, mi ? mi->name : ""); |
| } else { |
| _LOG(log, scopeFlags, " %08x %08x %s\n", |
| *sp, stack_content, mi ? mi->name : ""); |
| } |
| } |
| |
| *sp += sizeof(uint32_t); |
| } |
| } |
| |
| static void dump_stack(const ptrace_context_t* context, log_t* log, pid_t tid, bool at_fault, |
| const backtrace_frame_t* backtrace, size_t frames) { |
| bool have_first = false; |
| size_t first, last; |
| for (size_t i = 0; i < frames; i++) { |
| if (backtrace[i].stack_top) { |
| if (!have_first) { |
| have_first = true; |
| first = i; |
| } |
| last = i; |
| } |
| } |
| if (!have_first) { |
| return; |
| } |
| |
| int scopeFlags = SCOPE_SENSITIVE | (at_fault ? SCOPE_AT_FAULT : 0); |
| _LOG(log, scopeFlags, "\nstack:\n"); |
| |
| // Dump a few words before the first frame. |
| uintptr_t sp = backtrace[first].stack_top - STACK_WORDS * sizeof(uint32_t); |
| dump_stack_segment(context, log, tid, scopeFlags, &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_t* frame = &backtrace[i]; |
| if (sp != frame->stack_top) { |
| _LOG(log, scopeFlags, " ........ ........\n"); |
| sp = frame->stack_top; |
| } |
| if (i - first == 3) { |
| scopeFlags &= (~SCOPE_AT_FAULT); |
| } |
| if (i == last) { |
| dump_stack_segment(context, log, tid, scopeFlags, &sp, STACK_WORDS, i); |
| if (sp < frame->stack_top + frame->stack_size) { |
| _LOG(log, scopeFlags, " ........ ........\n"); |
| } |
| } else { |
| size_t words = frame->stack_size / sizeof(uint32_t); |
| if (words == 0) { |
| words = 1; |
| } else if (words > STACK_WORDS) { |
| words = STACK_WORDS; |
| } |
| dump_stack_segment(context, log, tid, scopeFlags, &sp, words, i); |
| } |
| } |
| } |
| |
| static void dump_backtrace_and_stack(const ptrace_context_t* context, log_t* log, pid_t tid, |
| bool at_fault) { |
| backtrace_frame_t backtrace[STACK_DEPTH]; |
| ssize_t frames = unwind_backtrace_ptrace(tid, context, backtrace, 0, STACK_DEPTH); |
| if (frames > 0) { |
| dump_backtrace(context, log, tid, at_fault, backtrace, frames); |
| dump_stack(context, log, tid, at_fault, backtrace, frames); |
| } |
| } |
| |
| static void dump_map(log_t* log, map_info_t* m, const char* what, int scopeFlags) { |
| if (m != NULL) { |
| _LOG(log, scopeFlags, " %08x-%08x %c%c%c %s\n", m->start, m->end, |
| m->is_readable ? 'r' : '-', |
| m->is_writable ? 'w' : '-', |
| m->is_executable ? 'x' : '-', |
| m->name); |
| } else { |
| _LOG(log, scopeFlags, " (no %s)\n", what); |
| } |
| } |
| |
| static void dump_nearby_maps(const ptrace_context_t* context, log_t* log, pid_t tid, bool at_fault) { |
| int scopeFlags = SCOPE_SENSITIVE | (at_fault ? SCOPE_AT_FAULT : 0); |
| siginfo_t si; |
| memset(&si, 0, sizeof(si)); |
| if (ptrace(PTRACE_GETSIGINFO, tid, 0, &si)) { |
| _LOG(log, scopeFlags, "cannot get siginfo for %d: %s\n", |
| tid, strerror(errno)); |
| return; |
| } |
| if (!signal_has_address(si.si_signo)) { |
| return; |
| } |
| |
| uintptr_t addr = (uintptr_t) si.si_addr; |
| addr &= ~0xfff; /* round to 4K page boundary */ |
| if (addr == 0) { /* null-pointer deref */ |
| return; |
| } |
| |
| _LOG(log, scopeFlags, "\nmemory map around fault addr %08x:\n", (int)si.si_addr); |
| |
| /* |
| * Search for a match, or for a hole where the match would be. The list |
| * is backward from the file content, so it starts at high addresses. |
| */ |
| map_info_t* map = context->map_info_list; |
| map_info_t *next = NULL; |
| map_info_t *prev = NULL; |
| while (map != NULL) { |
| if (addr >= map->start && addr < map->end) { |
| next = map->next; |
| break; |
| } else if (addr >= map->end) { |
| /* map would be between "prev" and this entry */ |
| next = map; |
| map = NULL; |
| break; |
| } |
| |
| prev = map; |
| map = map->next; |
| } |
| |
| /* |
| * Show "next" then "match" then "prev" so that the addresses appear in |
| * ascending order (like /proc/pid/maps). |
| */ |
| dump_map(log, next, "map below", scopeFlags); |
| dump_map(log, map, "map for address", scopeFlags); |
| dump_map(log, prev, "map above", scopeFlags); |
| } |
| |
| static void dump_thread(const ptrace_context_t* context, log_t* log, pid_t tid, bool at_fault, |
| int* total_sleep_time_usec) { |
| wait_for_stop(tid, total_sleep_time_usec); |
| |
| dump_registers(context, log, tid, at_fault); |
| dump_backtrace_and_stack(context, log, tid, at_fault); |
| if (at_fault) { |
| dump_memory_and_code(context, log, tid, at_fault); |
| dump_nearby_maps(context, log, tid, at_fault); |
| } |
| } |
| |
| /* Return true if some thread is not detached cleanly */ |
| static bool dump_sibling_thread_report(const ptrace_context_t* context, |
| log_t* log, pid_t pid, pid_t tid, int* total_sleep_time_usec) { |
| char task_path[64]; |
| snprintf(task_path, sizeof(task_path), "/proc/%d/task", pid); |
| |
| DIR* d = opendir(task_path); |
| /* Bail early if cannot open the task directory */ |
| if (d == NULL) { |
| XLOG("Cannot open /proc/%d/task\n", pid); |
| return false; |
| } |
| |
| bool detach_failed = false; |
| struct dirent* de; |
| while ((de = readdir(d)) != NULL) { |
| /* Ignore "." and ".." */ |
| if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, "..")) { |
| continue; |
| } |
| |
| /* The main thread at fault has been handled individually */ |
| char* end; |
| pid_t new_tid = strtoul(de->d_name, &end, 10); |
| if (*end || new_tid == tid) { |
| continue; |
| } |
| |
| /* Skip this thread if cannot ptrace it */ |
| if (ptrace(PTRACE_ATTACH, new_tid, 0, 0) < 0) { |
| continue; |
| } |
| |
| _LOG(log, 0, "--- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---\n"); |
| dump_thread_info(log, pid, new_tid, false); |
| dump_thread(context, log, new_tid, false, total_sleep_time_usec); |
| |
| if (ptrace(PTRACE_DETACH, new_tid, 0, 0) != 0) { |
| LOG("ptrace detach from %d failed: %s\n", new_tid, strerror(errno)); |
| detach_failed = true; |
| } |
| } |
| |
| closedir(d); |
| return detach_failed; |
| } |
| |
| /* |
| * 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 "tailOnly" is set, we only print the last few lines. |
| */ |
| static void dump_log_file(log_t* log, pid_t pid, const char* filename, |
| bool tailOnly) |
| { |
| bool first = true; |
| |
| /* circular buffer, for "tailOnly" mode */ |
| const int kShortLogMaxLines = 5; |
| const int kShortLogLineLen = 256; |
| char shortLog[kShortLogMaxLines][kShortLogLineLen]; |
| int shortLogCount = 0; |
| int shortLogNext = 0; |
| |
| int logfd = open(filename, O_RDONLY | O_NONBLOCK); |
| if (logfd < 0) { |
| XLOG("Unable to open %s: %s\n", filename, strerror(errno)); |
| return; |
| } |
| |
| union { |
| unsigned char buf[LOGGER_ENTRY_MAX_LEN + 1]; |
| struct logger_entry entry; |
| } log_entry; |
| |
| while (true) { |
| ssize_t actual = read(logfd, log_entry.buf, LOGGER_ENTRY_MAX_LEN); |
| if (actual < 0) { |
| if (errno == EINTR) { |
| /* interrupted by signal, retry */ |
| continue; |
| } else if (errno == EAGAIN) { |
| /* non-blocking EOF; we're done */ |
| break; |
| } else { |
| _LOG(log, 0, "Error while reading log: %s\n", |
| strerror(errno)); |
| break; |
| } |
| } else if (actual == 0) { |
| _LOG(log, 0, "Got zero bytes while reading log: %s\n", |
| strerror(errno)); |
| break; |
| } |
| |
| /* |
| * NOTE: if you XLOG 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. |
| */ |
| |
| struct logger_entry* entry = &log_entry.entry; |
| |
| if (entry->pid != (int32_t) pid) { |
| /* wrong pid, ignore */ |
| continue; |
| } |
| |
| if (first) { |
| _LOG(log, 0, "--------- %slog %s\n", |
| tailOnly ? "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). |
| * |
| * TODO: scan for line breaks ('\n') and display each text line |
| * on a separate line, prefixed with the header, like logcat does. |
| */ |
| static const char* kPrioChars = "!.VDIWEFS"; |
| unsigned char prio = entry->msg[0]; |
| char* tag = entry->msg + 1; |
| char* msg = tag + strlen(tag) + 1; |
| |
| /* consume any trailing newlines */ |
| char* eatnl = msg + strlen(msg) - 1; |
| while (eatnl >= msg && *eatnl == '\n') { |
| *eatnl-- = '\0'; |
| } |
| |
| char prioChar = (prio < strlen(kPrioChars) ? kPrioChars[prio] : '?'); |
| |
| char timeBuf[32]; |
| time_t sec = (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 (tailOnly) { |
| snprintf(shortLog[shortLogNext], kShortLogLineLen, |
| "%s.%03d %5d %5d %c %-8s: %s", |
| timeBuf, entry->nsec / 1000000, entry->pid, entry->tid, |
| prioChar, tag, msg); |
| shortLogNext = (shortLogNext + 1) % kShortLogMaxLines; |
| shortLogCount++; |
| } else { |
| _LOG(log, 0, "%s.%03d %5d %5d %c %-8s: %s\n", |
| timeBuf, entry->nsec / 1000000, entry->pid, entry->tid, |
| prioChar, tag, msg); |
| } |
| } |
| |
| if (tailOnly) { |
| int i; |
| |
| /* |
| * If we filled the buffer, we want to start at "next", which has |
| * the oldest entry. If we didn't, we want to start at zero. |
| */ |
| if (shortLogCount < kShortLogMaxLines) { |
| shortLogNext = 0; |
| } else { |
| shortLogCount = kShortLogMaxLines; /* cap at window size */ |
| } |
| |
| for (i = 0; i < shortLogCount; i++) { |
| _LOG(log, 0, "%s\n", shortLog[shortLogNext]); |
| shortLogNext = (shortLogNext + 1) % kShortLogMaxLines; |
| } |
| } |
| |
| close(logfd); |
| } |
| |
| /* |
| * 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, bool tailOnly) |
| { |
| dump_log_file(log, pid, "/dev/log/system", tailOnly); |
| dump_log_file(log, pid, "/dev/log/main", tailOnly); |
| } |
| |
| static void dump_abort_message(log_t* log, pid_t tid, 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)]) { |
| uint32_t data; |
| if (!try_get_word_ptrace(tid, address, &data)) { |
| break; |
| } |
| address += sizeof(uint32_t); |
| |
| if ((*p++ = (data >> 0) & 0xff) == 0) { |
| break; |
| } |
| if ((*p++ = (data >> 8) & 0xff) == 0) { |
| break; |
| } |
| if ((*p++ = (data >> 16) & 0xff) == 0) { |
| break; |
| } |
| if ((*p++ = (data >> 24) & 0xff) == 0) { |
| break; |
| } |
| } |
| msg[sizeof(msg) - 1] = '\0'; |
| |
| _LOG(log, SCOPE_AT_FAULT, "Abort message: '%s'\n", msg); |
| } |
| |
| /* |
| * Dumps all information about the specified pid to the tombstone. |
| */ |
| static bool dump_crash(log_t* log, pid_t pid, pid_t tid, int signal, uintptr_t abort_msg_address, |
| bool dump_sibling_threads, int* total_sleep_time_usec) |
| { |
| /* don't copy log messages to tombstone unless this is a dev device */ |
| char value[PROPERTY_VALUE_MAX]; |
| property_get("ro.debuggable", value, "0"); |
| bool want_logs = (value[0] == '1'); |
| |
| if (log->amfd >= 0) { |
| /* |
| * Activity Manager protocol: binary 32-bit network-byte-order ints for the |
| * pid and signal number, followed by the raw text of the dump, culminating |
| * in a zero byte that marks end-of-data. |
| */ |
| uint32_t datum = htonl(pid); |
| TEMP_FAILURE_RETRY( write(log->amfd, &datum, 4) ); |
| datum = htonl(signal); |
| TEMP_FAILURE_RETRY( write(log->amfd, &datum, 4) ); |
| } |
| |
| _LOG(log, SCOPE_AT_FAULT, |
| "*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***\n"); |
| dump_build_info(log); |
| dump_revision_info(log); |
| dump_thread_info(log, pid, tid, true); |
| if (signal) { |
| dump_fault_addr(log, tid, signal); |
| } |
| dump_abort_message(log, tid, abort_msg_address); |
| |
| ptrace_context_t* context = load_ptrace_context(tid); |
| dump_thread(context, log, tid, true, total_sleep_time_usec); |
| |
| if (want_logs) { |
| dump_logs(log, pid, true); |
| } |
| |
| bool detach_failed = false; |
| if (dump_sibling_threads) { |
| detach_failed = dump_sibling_thread_report(context, log, pid, tid, total_sleep_time_usec); |
| } |
| |
| free_ptrace_context(context); |
| |
| if (want_logs) { |
| dump_logs(log, pid, false); |
| } |
| |
| /* send EOD to the Activity Manager, then wait for its ack to avoid racing ahead |
| * and killing the target out from under it */ |
| if (log->amfd >= 0) { |
| uint8_t eodMarker = 0; |
| TEMP_FAILURE_RETRY( write(log->amfd, &eodMarker, 1) ); |
| /* 3 sec timeout reading the ack; we're fine if that happens */ |
| TEMP_FAILURE_RETRY( read(log->amfd, &eodMarker, 1) ); |
| } |
| |
| return detach_failed; |
| } |
| |
| /* |
| * find_and_open_tombstone - find an available tombstone slot, if any, of the |
| * form tombstone_XX where XX is 00 to MAX_TOMBSTONES-1, inclusive. If no |
| * file is available, we reuse the least-recently-modified file. |
| * |
| * Returns the path of the tombstone file, allocated using malloc(). Caller must free() it. |
| */ |
| static char* find_and_open_tombstone(int* fd) |
| { |
| unsigned long mtime = ULONG_MAX; |
| struct stat sb; |
| |
| /* |
| * XXX: Our stat.st_mtime isn't time_t. If it changes, as it probably ought |
| * to, our logic breaks. This check will generate a warning if that happens. |
| */ |
| typecheck(mtime, sb.st_mtime); |
| |
| /* |
| * In a single wolf-like pass, find an available slot and, in case none |
| * exist, find and record the least-recently-modified file. |
| */ |
| char path[128]; |
| int oldest = 0; |
| for (int i = 0; i < MAX_TOMBSTONES; i++) { |
| snprintf(path, sizeof(path), TOMBSTONE_DIR"/tombstone_%02d", i); |
| |
| if (!stat(path, &sb)) { |
| if (sb.st_mtime < mtime) { |
| oldest = i; |
| mtime = sb.st_mtime; |
| } |
| continue; |
| } |
| if (errno != ENOENT) |
| continue; |
| |
| *fd = open(path, O_CREAT | O_EXCL | O_WRONLY, 0600); |
| if (*fd < 0) |
| continue; /* raced ? */ |
| |
| fchown(*fd, AID_SYSTEM, AID_SYSTEM); |
| return strdup(path); |
| } |
| |
| /* we didn't find an available file, so we clobber the oldest one */ |
| snprintf(path, sizeof(path), TOMBSTONE_DIR"/tombstone_%02d", oldest); |
| *fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600); |
| if (*fd < 0) { |
| LOG("failed to open tombstone file '%s': %s\n", path, strerror(errno)); |
| return NULL; |
| } |
| fchown(*fd, AID_SYSTEM, AID_SYSTEM); |
| return strdup(path); |
| } |
| |
| static int activity_manager_connect() { |
| int amfd = socket(PF_UNIX, SOCK_STREAM, 0); |
| if (amfd >= 0) { |
| struct sockaddr_un address; |
| int err; |
| |
| memset(&address, 0, sizeof(address)); |
| address.sun_family = AF_UNIX; |
| strncpy(address.sun_path, NCRASH_SOCKET_PATH, sizeof(address.sun_path)); |
| err = TEMP_FAILURE_RETRY( connect(amfd, (struct sockaddr*) &address, sizeof(address)) ); |
| if (!err) { |
| struct timeval tv; |
| memset(&tv, 0, sizeof(tv)); |
| tv.tv_sec = 1; // tight leash |
| err = setsockopt(amfd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)); |
| if (!err) { |
| tv.tv_sec = 3; // 3 seconds on handshake read |
| err = setsockopt(amfd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)); |
| } |
| } |
| if (err) { |
| close(amfd); |
| amfd = -1; |
| } |
| } |
| |
| return amfd; |
| } |
| |
| char* engrave_tombstone(pid_t pid, pid_t tid, int signal, uintptr_t abort_msg_address, |
| bool dump_sibling_threads, bool quiet, bool* detach_failed, |
| int* total_sleep_time_usec) { |
| mkdir(TOMBSTONE_DIR, 0755); |
| chown(TOMBSTONE_DIR, AID_SYSTEM, AID_SYSTEM); |
| |
| if (selinux_android_restorecon(TOMBSTONE_DIR) == -1) { |
| *detach_failed = false; |
| return NULL; |
| } |
| |
| int fd; |
| char* path = find_and_open_tombstone(&fd); |
| if (!path) { |
| *detach_failed = false; |
| return NULL; |
| } |
| |
| log_t log; |
| log.tfd = fd; |
| log.amfd = activity_manager_connect(); |
| log.quiet = quiet; |
| *detach_failed = dump_crash(&log, pid, tid, signal, abort_msg_address, dump_sibling_threads, |
| total_sleep_time_usec); |
| |
| close(log.amfd); |
| close(fd); |
| return path; |
| } |
