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platform_system_core/debuggerd/tombstone.c

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/*
* 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>
#ifdef HAVE_SELINUX
#include <selinux/android.h>
#endif
#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"
#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)
{
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;
}
return "?";
}
static void dump_build_info(log_t* log)
{
char fingerprint[PROPERTY_VALUE_MAX];
property_get("ro.build.fingerprint", fingerprint, "unknown");
_LOG(log, false, "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, false, "cannot get siginfo: %s\n", strerror(errno));
} else if (signal_has_address(sig)) {
_LOG(log, false, "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, false, "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, false, "pid: %d, tid: %d, name: %s >>> %s <<<\n", pid, tid,
threadname ? threadname : "UNKNOWN",
procname ? procname : "UNKNOWN");
} else {
_LOG(log, true, "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) {
_LOG(log, !at_fault, "\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, !at_fault, " %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,
bool only_in_tombstone, 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, only_in_tombstone, " #%02d %08x %08x %s (%s+%u)\n",
label, *sp, stack_content, mi ? mi->name : "", symbol_name, offset);
} else {
_LOG(log, only_in_tombstone, " #%02d %08x %08x %s (%s)\n",
label, *sp, stack_content, mi ? mi->name : "", symbol_name);
}
} else {
if (offset) {
_LOG(log, only_in_tombstone, " %08x %08x %s (%s+%u)\n",
*sp, stack_content, mi ? mi->name : "", symbol_name, offset);
} else {
_LOG(log, only_in_tombstone, " %08x %08x %s (%s)\n",
*sp, stack_content, mi ? mi->name : "", symbol_name);
}
}
free(demangled_name);
} else {
if (!i && label >= 0) {
_LOG(log, only_in_tombstone, " #%02d %08x %08x %s\n",
label, *sp, stack_content, mi ? mi->name : "");
} else {
_LOG(log, only_in_tombstone, " %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;
}
_LOG(log, !at_fault, "\nstack:\n");
// Dump a few words before the first frame.
bool only_in_tombstone = !at_fault;
uintptr_t sp = backtrace[first].stack_top - STACK_WORDS * sizeof(uint32_t);
dump_stack_segment(context, log, tid, only_in_tombstone, &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, only_in_tombstone, " ........ ........\n");
sp = frame->stack_top;
}
if (i - first == 3) {
only_in_tombstone = true;
}
if (i == last) {
dump_stack_segment(context, log, tid, only_in_tombstone, &sp, STACK_WORDS, i);
if (sp < frame->stack_top + frame->stack_size) {
_LOG(log, only_in_tombstone, " ........ ........\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, only_in_tombstone, &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_nearby_maps(const ptrace_context_t* context, log_t* log, pid_t tid) {
siginfo_t si;
memset(&si, 0, sizeof(si));
if (ptrace(PTRACE_GETSIGINFO, tid, 0, &si)) {
_LOG(log, false, "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, false, "\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).
*/
if (next != NULL) {
_LOG(log, false, " %08x-%08x %s\n", next->start, next->end, next->name);
} else {
_LOG(log, false, " (no map below)\n");
}
if (map != NULL) {
_LOG(log, false, " %08x-%08x %s\n", map->start, map->end, map->name);
} else {
_LOG(log, false, " (no map for address)\n");
}
if (prev != NULL) {
_LOG(log, false, " %08x-%08x %s\n", prev->start, prev->end, prev->name);
} else {
_LOG(log, false, " (no map above)\n");
}
}
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);
}
}
/* 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 debuf;
struct dirent *de;
while (!readdir_r(d, &debuf, &de) && de) {
/* 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, true, "--- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---\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, true, "Error while reading log: %s\n",
strerror(errno));
break;
}
} else if (actual == 0) {
_LOG(log, true, "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, true, "--------- %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, true, "%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, true, "%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);
}
/*
* 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,
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');
_LOG(log, false,
"*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***\n");
dump_build_info(log);
dump_thread_info(log, pid, tid, true);
if(signal) {
dump_fault_addr(log, tid, signal);
}
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);
}
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);
}
char* engrave_tombstone(pid_t pid, pid_t tid, int signal,
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);
#ifdef HAVE_SELINUX
if (selinux_android_restorecon(TOMBSTONE_DIR) == -1) {
*detach_failed = false;
return NULL;
}
#endif
int fd;
char* path = find_and_open_tombstone(&fd);
if (!path) {
*detach_failed = false;
return NULL;
}
log_t log;
log.tfd = fd;
log.quiet = quiet;
*detach_failed = dump_crash(&log, pid, tid, signal, dump_sibling_threads,
total_sleep_time_usec);
close(fd);
return path;
}
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