From 707b8bbe1800dbebd932f54e86347563ee86c36e Mon Sep 17 00:00:00 2001 From: Elliott Hughes Date: Thu, 4 Apr 2013 13:52:01 -0700 Subject: Modify debuggerd to cope with the abort message. Bug: 8531731 Change-Id: I416ec1da38a8a1b0d0a582ccd7c8aaa681ed4a29 --- debuggerd/debuggerd.c | 14 ++++++++++---- debuggerd/tombstone.c | 48 ++++++++++++++++++++++++++++++++++++++++++------ debuggerd/tombstone.h | 2 +- 3 files changed, 53 insertions(+), 11 deletions(-) (limited to 'debuggerd') diff --git a/debuggerd/debuggerd.c b/debuggerd/debuggerd.c index 55222c5..99e6f13 100644 --- a/debuggerd/debuggerd.c +++ b/debuggerd/debuggerd.c @@ -52,6 +52,7 @@ typedef struct { debugger_action_t action; pid_t pid, tid; uid_t uid, gid; + uintptr_t abort_msg_address; } debugger_request_t; static int @@ -207,12 +208,15 @@ static int read_request(int fd, debugger_request_t* out_request) { } debugger_msg_t msg; + memset(&msg, 0, sizeof(msg)); status = TEMP_FAILURE_RETRY(read(fd, &msg, sizeof(msg))); if (status < 0) { LOG("read failure? %s\n", strerror(errno)); return -1; } - if (status != sizeof(msg)) { + if (status == sizeof(debugger_msg_t)) { + XLOG("crash request of size %d abort_msg_address=%#08x\n", status, msg.abort_msg_address); + } else { LOG("invalid crash request of size %d\n", status); return -1; } @@ -222,6 +226,7 @@ static int read_request(int fd, debugger_request_t* out_request) { out_request->pid = cr.pid; out_request->uid = cr.uid; out_request->gid = cr.gid; + out_request->abort_msg_address = msg.abort_msg_address; if (msg.action == DEBUGGER_ACTION_CRASH) { /* Ensure that the tid reported by the crashing process is valid. */ @@ -265,6 +270,7 @@ static void handle_request(int fd) { XLOG("handle_request(%d)\n", fd); debugger_request_t request; + memset(&request, 0, sizeof(request)); int status = read_request(fd, &request); if (!status) { XLOG("BOOM: pid=%d uid=%d gid=%d tid=%d\n", @@ -308,7 +314,7 @@ static void handle_request(int fd) { if (request.action == DEBUGGER_ACTION_DUMP_TOMBSTONE) { XLOG("stopped -- dumping to tombstone\n"); tombstone_path = engrave_tombstone(request.pid, request.tid, - signal, true, true, &detach_failed, + signal, request.abort_msg_address, true, true, &detach_failed, &total_sleep_time_usec); } else if (request.action == DEBUGGER_ACTION_DUMP_BACKTRACE) { XLOG("stopped -- dumping to fd\n"); @@ -345,8 +351,8 @@ static void handle_request(int fd) { /* don't dump sibling threads when attaching to GDB because it * makes the process less reliable, apparently... */ tombstone_path = engrave_tombstone(request.pid, request.tid, - signal, !attach_gdb, false, &detach_failed, - &total_sleep_time_usec); + signal, request.abort_msg_address, !attach_gdb, false, + &detach_failed, &total_sleep_time_usec); break; } diff --git a/debuggerd/tombstone.c b/debuggerd/tombstone.c index e8b3e24..da5f03c 100644 --- a/debuggerd/tombstone.c +++ b/debuggerd/tombstone.c @@ -174,7 +174,7 @@ 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)){ + 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", @@ -616,11 +616,46 @@ static void dump_logs(log_t* log, pid_t pid, bool 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, false, "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, - bool dump_sibling_threads, int* total_sleep_time_usec) +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]; @@ -632,9 +667,10 @@ static bool dump_crash(log_t* log, pid_t pid, pid_t tid, int signal, dump_build_info(log); dump_revision_info(log); dump_thread_info(log, pid, tid, true); - if(signal) { + 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); @@ -712,7 +748,7 @@ static char* find_and_open_tombstone(int* fd) return strdup(path); } -char* engrave_tombstone(pid_t pid, pid_t tid, int signal, +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); @@ -733,7 +769,7 @@ char* engrave_tombstone(pid_t pid, pid_t tid, int signal, log_t log; log.tfd = fd; log.quiet = quiet; - *detach_failed = dump_crash(&log, pid, tid, signal, dump_sibling_threads, + *detach_failed = dump_crash(&log, pid, tid, signal, abort_msg_address, dump_sibling_threads, total_sleep_time_usec); close(fd); diff --git a/debuggerd/tombstone.h b/debuggerd/tombstone.h index edcd7b1..d4a1a96 100644 --- a/debuggerd/tombstone.h +++ b/debuggerd/tombstone.h @@ -25,7 +25,7 @@ /* Creates a tombstone file and writes the crash dump to it. * Returns the path of the tombstone, which must be freed using free(). */ -char* engrave_tombstone(pid_t pid, pid_t tid, int signal, +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); #endif // _DEBUGGERD_TOMBSTONE_H -- cgit v1.1