Merge "debuggerd: fix several bugs caused by fork/setuid change."
diff --git a/debuggerd/backtrace.cpp b/debuggerd/backtrace.cpp
index b46f8f4..b6916e5 100644
--- a/debuggerd/backtrace.cpp
+++ b/debuggerd/backtrace.cpp
@@ -67,8 +67,7 @@
_LOG(log, logtype::BACKTRACE, "\n----- end %d -----\n", pid);
}
-static void dump_thread(
- log_t* log, pid_t tid, bool attached, bool* detach_failed, int* total_sleep_time_usec) {
+static void dump_thread(log_t* log, BacktraceMap* map, pid_t pid, pid_t tid) {
char path[PATH_MAX];
char threadnamebuf[1024];
char* threadname = NULL;
@@ -88,56 +87,25 @@
_LOG(log, logtype::BACKTRACE, "\n\"%s\" sysTid=%d\n", threadname ? threadname : "<unknown>", tid);
- if (!attached && ptrace(PTRACE_ATTACH, tid, 0, 0) < 0) {
- _LOG(log, logtype::BACKTRACE, "Could not attach to thread: %s\n", strerror(errno));
- return;
- }
-
- if (!attached && wait_for_sigstop(tid, total_sleep_time_usec, detach_failed) == -1) {
- return;
- }
-
- std::unique_ptr<Backtrace> backtrace(Backtrace::Create(tid, BACKTRACE_CURRENT_THREAD));
+ std::unique_ptr<Backtrace> backtrace(Backtrace::Create(pid, tid, map));
if (backtrace->Unwind(0)) {
dump_backtrace_to_log(backtrace.get(), log, " ");
} else {
ALOGE("Unwind failed: tid = %d", tid);
}
-
- if (!attached && ptrace(PTRACE_DETACH, tid, 0, 0) != 0) {
- ALOGE("ptrace detach from %d failed: %s\n", tid, strerror(errno));
- *detach_failed = true;
- }
}
-void dump_backtrace(int fd, int amfd, pid_t pid, pid_t tid, bool* detach_failed,
- int* total_sleep_time_usec) {
+void dump_backtrace(int fd, int amfd, BacktraceMap* map, pid_t pid, pid_t tid,
+ const std::set<pid_t>& siblings) {
log_t log;
log.tfd = fd;
log.amfd = amfd;
dump_process_header(&log, pid);
- dump_thread(&log, tid, true, detach_failed, total_sleep_time_usec);
+ dump_thread(&log, map, pid, tid);
- char task_path[64];
- snprintf(task_path, sizeof(task_path), "/proc/%d/task", pid);
- DIR* d = opendir(task_path);
- if (d != NULL) {
- struct dirent* de = NULL;
- while ((de = readdir(d)) != NULL) {
- if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, "..")) {
- continue;
- }
-
- char* end;
- pid_t new_tid = strtoul(de->d_name, &end, 10);
- if (*end || new_tid == tid) {
- continue;
- }
-
- dump_thread(&log, new_tid, false, detach_failed, total_sleep_time_usec);
- }
- closedir(d);
+ for (pid_t sibling : siblings) {
+ dump_thread(&log, map, pid, sibling);
}
dump_process_footer(&log, pid);
diff --git a/debuggerd/backtrace.h b/debuggerd/backtrace.h
index da14cd4..98c433b 100644
--- a/debuggerd/backtrace.h
+++ b/debuggerd/backtrace.h
@@ -19,14 +19,17 @@
#include <sys/types.h>
+#include <set>
+
#include "utility.h"
class Backtrace;
+class BacktraceMap;
// Dumps a backtrace using a format similar to what Dalvik uses so that the result
// can be intermixed in a bug report.
-void dump_backtrace(int fd, int amfd, pid_t pid, pid_t tid, bool* detach_failed,
- int* total_sleep_time_usec);
+void dump_backtrace(int fd, int amfd, BacktraceMap* map, pid_t pid, pid_t tid,
+ const std::set<pid_t>& siblings);
/* Dumps the backtrace in the backtrace data structure to the log. */
void dump_backtrace_to_log(Backtrace* backtrace, log_t* log, const char* prefix);
diff --git a/debuggerd/debuggerd.cpp b/debuggerd/debuggerd.cpp
index 58b629b..a8d19fc 100644
--- a/debuggerd/debuggerd.cpp
+++ b/debuggerd/debuggerd.cpp
@@ -14,14 +14,14 @@
* limitations under the License.
*/
-#include <stdio.h>
-#include <errno.h>
-#include <signal.h>
-#include <pthread.h>
-#include <stdarg.h>
-#include <fcntl.h>
-#include <sys/types.h>
#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <sys/types.h>
#include <time.h>
#include <elf.h>
@@ -31,6 +31,8 @@
#include <sys/stat.h>
#include <sys/wait.h>
+#include <set>
+
#include <selinux/android.h>
#include <log/logger.h>
@@ -57,6 +59,8 @@
#define SOCKET_NAME DEBUGGER_SOCKET_NAME
#endif
+extern "C" int tgkill(int tgid, int tid, int sig);
+
struct debugger_request_t {
debugger_action_t action;
pid_t pid, tid;
@@ -335,6 +339,121 @@
}
#endif
+static void ptrace_siblings(pid_t pid, pid_t main_tid, std::set<pid_t>& tids) {
+ char task_path[64];
+
+ snprintf(task_path, sizeof(task_path), "/proc/%d/task", pid);
+
+ std::unique_ptr<DIR, int (*)(DIR*)> d(opendir(task_path), closedir);
+
+ // Bail early if the task directory cannot be opened.
+ if (!d) {
+ ALOGE("debuggerd: failed to open /proc/%d/task: %s", pid, strerror(errno));
+ return;
+ }
+
+ struct dirent* de;
+ while ((de = readdir(d.get())) != NULL) {
+ // Ignore "." and "..".
+ if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, "..")) {
+ continue;
+ }
+
+ char* end;
+ pid_t tid = strtoul(de->d_name, &end, 10);
+ if (*end) {
+ continue;
+ }
+
+ if (tid == main_tid) {
+ continue;
+ }
+
+ if (ptrace(PTRACE_ATTACH, tid, 0, 0) < 0) {
+ ALOGE("debuggerd: ptrace attach to %d failed: %s", tid, strerror(errno));
+ continue;
+ }
+
+ tids.insert(tid);
+ }
+}
+
+static bool perform_dump(const debugger_request_t& request, int fd, int tombstone_fd,
+ BacktraceMap* backtrace_map, const std::set<pid_t>& siblings) {
+ if (TEMP_FAILURE_RETRY(write(fd, "\0", 1)) != 1) {
+ ALOGE("debuggerd: failed to respond to client: %s\n", strerror(errno));
+ return false;
+ }
+
+ int total_sleep_time_usec = 0;
+ while (true) {
+ int signal = wait_for_signal(request.tid, &total_sleep_time_usec);
+ switch (signal) {
+ case -1:
+ ALOGE("debuggerd: timed out waiting for signal");
+ return false;
+
+ case SIGSTOP:
+ if (request.action == DEBUGGER_ACTION_DUMP_TOMBSTONE) {
+ ALOGV("debuggerd: stopped -- dumping to tombstone");
+ engrave_tombstone(tombstone_fd, backtrace_map, request.pid, request.tid, siblings, signal,
+ request.original_si_code, request.abort_msg_address);
+ } else if (request.action == DEBUGGER_ACTION_DUMP_BACKTRACE) {
+ ALOGV("debuggerd: stopped -- dumping to fd");
+ dump_backtrace(fd, -1, backtrace_map, request.pid, request.tid, siblings);
+ } else {
+ ALOGV("debuggerd: stopped -- continuing");
+ if (ptrace(PTRACE_CONT, request.tid, 0, 0) != 0) {
+ ALOGE("debuggerd: ptrace continue failed: %s", strerror(errno));
+ return false;
+ }
+ continue; // loop again
+ }
+ break;
+
+ case SIGABRT:
+ case SIGBUS:
+ case SIGFPE:
+ case SIGILL:
+ case SIGSEGV:
+#ifdef SIGSTKFLT
+ case SIGSTKFLT:
+#endif
+ case SIGTRAP:
+ ALOGV("stopped -- fatal signal\n");
+ // Send a SIGSTOP to the process to make all of
+ // the non-signaled threads stop moving. Without
+ // this we get a lot of "ptrace detach failed:
+ // No such process".
+ kill(request.pid, SIGSTOP);
+ engrave_tombstone(tombstone_fd, backtrace_map, request.pid, request.tid, siblings, signal,
+ request.original_si_code, request.abort_msg_address);
+ break;
+
+ default:
+ ALOGE("debuggerd: process stopped due to unexpected signal %d\n", signal);
+ break;
+ }
+ break;
+ }
+
+ return true;
+}
+
+static bool drop_privileges() {
+ if (setresgid(AID_DEBUGGERD, AID_DEBUGGERD, AID_DEBUGGERD) != 0) {
+ ALOGE("debuggerd: failed to setresgid");
+ return false;
+ }
+
+ if (setresuid(AID_DEBUGGERD, AID_DEBUGGERD, AID_DEBUGGERD) != 0) {
+ ALOGE("debuggerd: failed to setresuid");
+ return false;
+ }
+
+ return true;
+}
+
static void handle_request(int fd) {
ALOGV("handle_request(%d)\n", fd);
@@ -405,117 +524,63 @@
// ensure that it can run as soon as we call PTRACE_CONT below.
// See details in bionic/libc/linker/debugger.c, in function
// debugger_signal_handler().
- if (ptrace(PTRACE_ATTACH, request.tid, 0, 0)) {
- ALOGE("debuggerd: ptrace attach failed: %s\n", strerror(errno));
+
+ // Attach to the target process.
+ if (ptrace(PTRACE_ATTACH, request.tid, 0, 0) != 0) {
+ ALOGE("debuggerd: ptrace attach failed: %s", strerror(errno));
exit(1);
}
+ // Don't attach to the sibling threads if we want to attach gdb.
+ // Supposedly, it makes the process less reliable.
+ bool attach_gdb = should_attach_gdb(&request);
+ std::set<pid_t> siblings;
+ if (!attach_gdb) {
+ ptrace_siblings(request.pid, request.tid, siblings);
+ }
+
// Generate the backtrace map before dropping privileges.
std::unique_ptr<BacktraceMap> backtrace_map(BacktraceMap::Create(request.pid));
+ bool succeeded = false;
+
// Now that we've done everything that requires privileges, we can drop them.
- if (setresgid(AID_DEBUGGERD, AID_DEBUGGERD, AID_DEBUGGERD) != 0) {
- ALOGE("debuggerd: failed to setresgid");
- exit(1);
- }
-
- if (setresuid(AID_DEBUGGERD, AID_DEBUGGERD, AID_DEBUGGERD) != 0) {
- ALOGE("debuggerd: failed to setresuid");
- exit(1);
- }
-
- bool detach_failed = false;
- bool tid_unresponsive = false;
- bool attach_gdb = should_attach_gdb(&request);
- if (TEMP_FAILURE_RETRY(write(fd, "\0", 1)) != 1) {
- ALOGE("debuggerd: failed to respond to client: %s\n", strerror(errno));
- exit(1);
- }
-
- int total_sleep_time_usec = 0;
- while (true) {
- int signal = wait_for_sigstop(request.tid, &total_sleep_time_usec, &detach_failed);
- if (signal == -1) {
- tid_unresponsive = true;
- break;
- }
-
- switch (signal) {
- case SIGSTOP:
- if (request.action == DEBUGGER_ACTION_DUMP_TOMBSTONE) {
- ALOGV("stopped -- dumping to tombstone\n");
- engrave_tombstone(tombstone_fd, backtrace_map.get(), request.pid, request.tid, signal,
- request.original_si_code, request.abort_msg_address, true,
- &detach_failed, &total_sleep_time_usec);
- } else if (request.action == DEBUGGER_ACTION_DUMP_BACKTRACE) {
- ALOGV("stopped -- dumping to fd\n");
- dump_backtrace(fd, -1, request.pid, request.tid, &detach_failed, &total_sleep_time_usec);
- } else {
- ALOGV("stopped -- continuing\n");
- status = ptrace(PTRACE_CONT, request.tid, 0, 0);
- if (status) {
- ALOGE("debuggerd: ptrace continue failed: %s\n", strerror(errno));
- }
- continue; // loop again
+ if (drop_privileges()) {
+ succeeded = perform_dump(request, fd, tombstone_fd, backtrace_map.get(), siblings);
+ if (succeeded) {
+ if (request.action == DEBUGGER_ACTION_DUMP_TOMBSTONE) {
+ if (!tombstone_path.empty()) {
+ write(fd, tombstone_path.c_str(), tombstone_path.length());
}
- break;
-
- case SIGABRT:
- case SIGBUS:
- case SIGFPE:
- case SIGILL:
- case SIGSEGV:
-#ifdef SIGSTKFLT
- case SIGSTKFLT:
-#endif
- case SIGTRAP:
- ALOGV("stopped -- fatal signal\n");
- // Send a SIGSTOP to the process to make all of
- // the non-signaled threads stop moving. Without
- // this we get a lot of "ptrace detach failed:
- // No such process".
- kill(request.pid, SIGSTOP);
- // don't dump sibling threads when attaching to GDB because it
- // makes the process less reliable, apparently...
- engrave_tombstone(tombstone_fd, backtrace_map.get(), request.pid, request.tid, signal,
- request.original_si_code, request.abort_msg_address, !attach_gdb,
- &detach_failed, &total_sleep_time_usec);
- break;
-
- default:
- ALOGE("debuggerd: process stopped due to unexpected signal %d\n", signal);
- break;
+ }
}
- break;
- }
- if (request.action == DEBUGGER_ACTION_DUMP_TOMBSTONE) {
- if (!tombstone_path.empty()) {
- write(fd, tombstone_path.c_str(), tombstone_path.length());
- }
- }
-
- if (!tid_unresponsive) {
- ALOGV("detaching");
if (attach_gdb) {
- // stop the process so we can debug
- kill(request.pid, SIGSTOP);
- }
- if (ptrace(PTRACE_DETACH, request.tid, 0, 0)) {
- ALOGE("debuggerd: ptrace detach from %d failed: %s", request.tid, strerror(errno));
- detach_failed = true;
- } else if (attach_gdb) {
- // if debug.db.uid is set, its value indicates if we should wait
- // for user action for the crashing process.
- // in this case, we log a message and turn the debug LED on
- // waiting for a gdb connection (for instance)
- wait_for_user_action(request);
+ // Stop the process so we can debug.
+ tgkill(request.pid, request.tid, SIGSTOP);
}
}
- // Resume the stopped process so it can crash in peace, and exit.
+ if (ptrace(PTRACE_DETACH, request.tid, 0, 0) != 0) {
+ ALOGE("debuggerd: ptrace detach from %d failed: %s", request.tid, strerror(errno));
+ }
+
+ for (pid_t sibling : siblings) {
+ ptrace(PTRACE_DETACH, sibling, 0, 0);
+ }
+
+ if (succeeded && attach_gdb) {
+ // if debug.debuggerd.wait_for_gdb is set, its value indicates if we should wait
+ // for user action for the crashing process.
+ // in this case, we log a message and turn the debug LED on
+ // waiting for a gdb connection (for instance)
+ wait_for_user_action(request);
+ }
+
+ // Resume the stopped process.
kill(request.pid, SIGCONT);
- exit(0);
+
+ exit(!succeeded);
}
static int do_server() {
diff --git a/debuggerd/tombstone.cpp b/debuggerd/tombstone.cpp
index b2f203d..dda6677 100644
--- a/debuggerd/tombstone.cpp
+++ b/debuggerd/tombstone.cpp
@@ -328,6 +328,33 @@
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;
@@ -416,67 +443,37 @@
}
}
-// Return true if some thread is not detached cleanly
-static bool dump_sibling_thread_report(
- log_t* log, pid_t pid, pid_t tid, int* total_sleep_time_usec, BacktraceMap* map) {
- char task_path[64];
-
- snprintf(task_path, sizeof(task_path), "/proc/%d/task", pid);
-
- DIR* d = opendir(task_path);
- // Bail early if the task directory cannot be opened
- if (d == NULL) {
- ALOGE("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) {
- ALOGE("ptrace attach to %d failed: %s\n", new_tid, strerror(errno));
- continue;
- }
-
- if (wait_for_sigstop(new_tid, total_sleep_time_usec, &detach_failed) == -1) {
- continue;
- }
-
- log->current_tid = new_tid;
+static void dump_thread(log_t* log, pid_t pid, pid_t tid, BacktraceMap* map, int signal,
+ int si_code, 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, new_tid);
+ }
+ dump_thread_info(log, pid, tid);
- dump_registers(log, new_tid);
- std::unique_ptr<Backtrace> backtrace(Backtrace::Create(pid, new_tid, map));
- if (backtrace->Unwind(0)) {
- dump_backtrace_and_stack(backtrace.get(), log);
- } else {
- ALOGE("Unwind of sibling failed: pid = %d, tid = %d", pid, new_tid);
- }
+ if (signal) {
+ dump_signal_info(log, tid, signal, si_code);
+ }
- log->current_tid = log->crashed_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 (ptrace(PTRACE_DETACH, new_tid, 0, 0) != 0) {
- ALOGE("ptrace detach from %d failed: %s\n", new_tid, strerror(errno));
- detach_failed = true;
+ if (primary_thread) {
+ dump_memory_and_code(log, backtrace.get());
+ if (map) {
+ dump_all_maps(backtrace.get(), map, log, tid);
}
}
- closedir(d);
- return detach_failed;
+ log->current_tid = log->crashed_tid;
}
// Reads the contents of the specified log device, filters out the entries
@@ -605,36 +602,10 @@
dump_log_file(log, pid, "main", tail);
}
-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);
-}
-
// Dumps all information about the specified pid to the tombstone.
-static bool dump_crash(log_t* log, BacktraceMap* map, pid_t pid, pid_t tid, int signal, int si_code,
- uintptr_t abort_msg_address, bool dump_sibling_threads,
- int* total_sleep_time_usec) {
+static void dump_crash(log_t* log, BacktraceMap* map, pid_t pid, pid_t tid,
+ const std::set<pid_t>& siblings, int signal, int si_code,
+ uintptr_t abort_msg_address) {
// don't copy log messages to tombstone unless this is a dev device
char value[PROPERTY_VALUE_MAX];
property_get("ro.debuggable", value, "0");
@@ -653,32 +624,15 @@
_LOG(log, logtype::HEADER,
"*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***\n");
dump_header_info(log);
- dump_thread_info(log, pid, tid);
-
- if (signal) {
- dump_signal_info(log, tid, signal, si_code);
- }
-
- std::unique_ptr<Backtrace> backtrace(Backtrace::Create(pid, tid, map));
- 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);
- }
- dump_memory_and_code(log, backtrace.get());
- if (map) {
- dump_all_maps(backtrace.get(), map, log, tid);
- }
-
+ dump_thread(log, pid, tid, map, signal, si_code, abort_msg_address, true);
if (want_logs) {
dump_logs(log, pid, 5);
}
- bool detach_failed = false;
- if (dump_sibling_threads) {
- detach_failed = dump_sibling_thread_report(log, pid, tid, total_sleep_time_usec, map);
+ if (!siblings.empty()) {
+ for (pid_t sibling : siblings) {
+ dump_thread(log, pid, sibling, map, 0, 0, 0, false);
+ }
}
if (want_logs) {
@@ -694,7 +648,7 @@
TEMP_FAILURE_RETRY( read(log->amfd, &eodMarker, 1) );
}
- return detach_failed;
+ return;
}
// open_tombstone - find an available tombstone slot, if any, of the
@@ -780,16 +734,15 @@
return amfd;
}
-void engrave_tombstone(int tombstone_fd, BacktraceMap* map, pid_t pid, pid_t tid, int signal,
- int original_si_code, uintptr_t abort_msg_address, bool dump_sibling_threads,
- bool* detach_failed, int* total_sleep_time_usec) {
+void engrave_tombstone(int tombstone_fd, BacktraceMap* map, pid_t pid, pid_t tid,
+ const std::set<pid_t>& siblings, int signal, int original_si_code,
+ uintptr_t abort_msg_address) {
log_t log;
log.current_tid = tid;
log.crashed_tid = tid;
if (tombstone_fd < 0) {
ALOGE("debuggerd: skipping tombstone write, nothing to do.\n");
- *detach_failed = false;
return;
}
@@ -798,8 +751,7 @@
// being closed.
int amfd = activity_manager_connect();
log.amfd = amfd;
- *detach_failed = dump_crash(&log, map, pid, tid, signal, original_si_code, abort_msg_address,
- dump_sibling_threads, total_sleep_time_usec);
+ dump_crash(&log, map, pid, tid, siblings, signal, original_si_code, abort_msg_address);
// This file descriptor can be -1, any error is ignored.
close(amfd);
diff --git a/debuggerd/tombstone.h b/debuggerd/tombstone.h
index 5f2d239..2b8b8be 100644
--- a/debuggerd/tombstone.h
+++ b/debuggerd/tombstone.h
@@ -20,6 +20,7 @@
#include <stdbool.h>
#include <stddef.h>
#include <sys/types.h>
+#include <set>
#include <string>
class BacktraceMap;
@@ -30,10 +31,9 @@
*/
int open_tombstone(std::string* path);
-/* Creates a tombstone file and writes the crash dump to it.
- * Returns the path of the tombstone, which must be freed using free(). */
-void engrave_tombstone(int tombstone_fd, BacktraceMap* map, pid_t pid, pid_t tid, int signal,
- int original_si_code, uintptr_t abort_msg_address, bool dump_sibling_threads,
- bool* detach_failed, int* total_sleep_time_usec);
+/* Creates a tombstone file and writes the crash dump to it. */
+void engrave_tombstone(int tombstone_fd, BacktraceMap* map, pid_t pid, pid_t tid,
+ const std::set<pid_t>& siblings, int signal, int original_si_code,
+ uintptr_t abort_msg_address);
#endif // _DEBUGGERD_TOMBSTONE_H
diff --git a/debuggerd/utility.cpp b/debuggerd/utility.cpp
index ce214f9..cd252ce 100644
--- a/debuggerd/utility.cpp
+++ b/debuggerd/utility.cpp
@@ -30,8 +30,8 @@
#include <backtrace/Backtrace.h>
#include <log/log.h>
-const int SLEEP_TIME_USEC = 50000; // 0.05 seconds
-const int MAX_TOTAL_SLEEP_USEC = 10000000; // 10 seconds
+constexpr int SLEEP_TIME_USEC = 50000; // 0.05 seconds
+constexpr int MAX_TOTAL_SLEEP_USEC = 10000000; // 10 seconds
// Whitelist output desired in the logcat output.
bool is_allowed_in_logcat(enum logtype ltype) {
@@ -78,14 +78,13 @@
}
}
-int wait_for_sigstop(pid_t tid, int* total_sleep_time_usec, bool* detach_failed) {
- bool allow_dead_tid = false;
- for (;;) {
+int wait_for_signal(pid_t tid, int* total_sleep_time_usec) {
+ while (true) {
int status;
pid_t n = TEMP_FAILURE_RETRY(waitpid(tid, &status, __WALL | WNOHANG));
if (n == -1) {
ALOGE("waitpid failed: tid %d, %s", tid, strerror(errno));
- break;
+ return -1;
} else if (n == tid) {
if (WIFSTOPPED(status)) {
return WSTOPSIG(status);
@@ -93,29 +92,18 @@
ALOGE("unexpected waitpid response: n=%d, status=%08x\n", n, status);
// This is the only circumstance under which we can allow a detach
// to fail with ESRCH, which indicates the tid has exited.
- allow_dead_tid = true;
- break;
+ return -1;
}
}
if (*total_sleep_time_usec > MAX_TOTAL_SLEEP_USEC) {
ALOGE("timed out waiting for stop signal: tid=%d", tid);
- break;
+ return -1;
}
usleep(SLEEP_TIME_USEC);
*total_sleep_time_usec += SLEEP_TIME_USEC;
}
-
- if (ptrace(PTRACE_DETACH, tid, 0, 0) != 0) {
- if (allow_dead_tid && errno == ESRCH) {
- ALOGE("tid exited before attach completed: tid %d", tid);
- } else {
- *detach_failed = true;
- ALOGE("detach failed: tid %d, %s", tid, strerror(errno));
- }
- }
- return -1;
}
#define MEMORY_BYTES_TO_DUMP 256
diff --git a/debuggerd/utility.h b/debuggerd/utility.h
index 8bef192..ed08ddc 100644
--- a/debuggerd/utility.h
+++ b/debuggerd/utility.h
@@ -74,7 +74,7 @@
void _LOG(log_t* log, logtype ltype, const char *fmt, ...)
__attribute__ ((format(printf, 3, 4)));
-int wait_for_sigstop(pid_t, int*, bool*);
+int wait_for_signal(pid_t tid, int* total_sleep_time_usec);
void dump_memory(log_t* log, Backtrace* backtrace, uintptr_t addr, const char* fmt, ...);