716 lines
22 KiB
C++
716 lines
22 KiB
C++
/*
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* Copyright (C) 2012-2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "DEBUG"
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <signal.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ptrace.h>
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#include <sys/stat.h>
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#include <time.h>
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#include <memory>
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#include <string>
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#include <android-base/stringprintf.h>
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#include <backtrace/Backtrace.h>
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#include <backtrace/BacktraceMap.h>
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#include <cutils/properties.h>
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#include <log/log.h>
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#include <log/logprint.h>
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#include <private/android_filesystem_config.h>
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#include <private/android_logger.h>
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#include <selinux/android.h>
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#include "backtrace.h"
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#include "elf_utils.h"
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#include "machine.h"
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#include "tombstone.h"
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#define STACK_WORDS 16
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#define MAX_TOMBSTONES 10
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#define TOMBSTONE_DIR "/data/tombstones"
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#define TOMBSTONE_TEMPLATE (TOMBSTONE_DIR"/tombstone_%02d")
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static bool signal_has_si_addr(int si_signo, int si_code) {
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// Manually sent signals won't have si_addr.
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if (si_code == SI_USER || si_code == SI_QUEUE || si_code == SI_TKILL) {
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return false;
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}
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switch (si_signo) {
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case SIGBUS:
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case SIGFPE:
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case SIGILL:
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case SIGSEGV:
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case SIGTRAP:
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return true;
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default:
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return false;
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}
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}
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static const char* get_signame(int sig) {
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switch(sig) {
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case SIGABRT: return "SIGABRT";
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case SIGBUS: return "SIGBUS";
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case SIGFPE: return "SIGFPE";
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case SIGILL: return "SIGILL";
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case SIGSEGV: return "SIGSEGV";
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#if defined(SIGSTKFLT)
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case SIGSTKFLT: return "SIGSTKFLT";
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#endif
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case SIGSTOP: return "SIGSTOP";
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case SIGSYS: return "SIGSYS";
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case SIGTRAP: return "SIGTRAP";
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default: return "?";
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}
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}
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static const char* get_sigcode(int signo, int code) {
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// Try the signal-specific codes...
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switch (signo) {
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case SIGILL:
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switch (code) {
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case ILL_ILLOPC: return "ILL_ILLOPC";
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case ILL_ILLOPN: return "ILL_ILLOPN";
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case ILL_ILLADR: return "ILL_ILLADR";
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case ILL_ILLTRP: return "ILL_ILLTRP";
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case ILL_PRVOPC: return "ILL_PRVOPC";
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case ILL_PRVREG: return "ILL_PRVREG";
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case ILL_COPROC: return "ILL_COPROC";
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case ILL_BADSTK: return "ILL_BADSTK";
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}
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static_assert(NSIGILL == ILL_BADSTK, "missing ILL_* si_code");
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break;
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case SIGBUS:
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switch (code) {
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case BUS_ADRALN: return "BUS_ADRALN";
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case BUS_ADRERR: return "BUS_ADRERR";
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case BUS_OBJERR: return "BUS_OBJERR";
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case BUS_MCEERR_AR: return "BUS_MCEERR_AR";
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case BUS_MCEERR_AO: return "BUS_MCEERR_AO";
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}
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static_assert(NSIGBUS == BUS_MCEERR_AO, "missing BUS_* si_code");
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break;
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case SIGFPE:
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switch (code) {
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case FPE_INTDIV: return "FPE_INTDIV";
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case FPE_INTOVF: return "FPE_INTOVF";
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case FPE_FLTDIV: return "FPE_FLTDIV";
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case FPE_FLTOVF: return "FPE_FLTOVF";
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case FPE_FLTUND: return "FPE_FLTUND";
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case FPE_FLTRES: return "FPE_FLTRES";
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case FPE_FLTINV: return "FPE_FLTINV";
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case FPE_FLTSUB: return "FPE_FLTSUB";
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}
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static_assert(NSIGFPE == FPE_FLTSUB, "missing FPE_* si_code");
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break;
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case SIGSEGV:
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switch (code) {
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case SEGV_MAPERR: return "SEGV_MAPERR";
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case SEGV_ACCERR: return "SEGV_ACCERR";
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#if defined(SEGV_BNDERR)
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case SEGV_BNDERR: return "SEGV_BNDERR";
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#endif
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#if defined(SEGV_PKUERR)
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case SEGV_PKUERR: return "SEGV_PKUERR";
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#endif
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}
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#if defined(SEGV_PKUERR)
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static_assert(NSIGSEGV == SEGV_PKUERR, "missing SEGV_* si_code");
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#elif defined(SEGV_BNDERR)
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static_assert(NSIGSEGV == SEGV_BNDERR, "missing SEGV_* si_code");
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#else
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static_assert(NSIGSEGV == SEGV_ACCERR, "missing SEGV_* si_code");
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#endif
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break;
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#if defined(SYS_SECCOMP) // Our glibc is too old, and we build this for the host too.
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case SIGSYS:
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switch (code) {
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case SYS_SECCOMP: return "SYS_SECCOMP";
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}
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static_assert(NSIGSYS == SYS_SECCOMP, "missing SYS_* si_code");
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break;
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#endif
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case SIGTRAP:
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switch (code) {
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case TRAP_BRKPT: return "TRAP_BRKPT";
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case TRAP_TRACE: return "TRAP_TRACE";
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case TRAP_BRANCH: return "TRAP_BRANCH";
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case TRAP_HWBKPT: return "TRAP_HWBKPT";
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}
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static_assert(NSIGTRAP == TRAP_HWBKPT, "missing TRAP_* si_code");
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break;
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}
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// Then the other codes...
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switch (code) {
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case SI_USER: return "SI_USER";
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case SI_KERNEL: return "SI_KERNEL";
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case SI_QUEUE: return "SI_QUEUE";
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case SI_TIMER: return "SI_TIMER";
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case SI_MESGQ: return "SI_MESGQ";
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case SI_ASYNCIO: return "SI_ASYNCIO";
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case SI_SIGIO: return "SI_SIGIO";
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case SI_TKILL: return "SI_TKILL";
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case SI_DETHREAD: return "SI_DETHREAD";
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}
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// Then give up...
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return "?";
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}
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static void dump_header_info(log_t* log) {
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char fingerprint[PROPERTY_VALUE_MAX];
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char revision[PROPERTY_VALUE_MAX];
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property_get("ro.build.fingerprint", fingerprint, "unknown");
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property_get("ro.revision", revision, "unknown");
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_LOG(log, logtype::HEADER, "Build fingerprint: '%s'\n", fingerprint);
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_LOG(log, logtype::HEADER, "Revision: '%s'\n", revision);
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_LOG(log, logtype::HEADER, "ABI: '%s'\n", ABI_STRING);
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}
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static void dump_signal_info(log_t* log, pid_t tid) {
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siginfo_t si;
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memset(&si, 0, sizeof(si));
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if (ptrace(PTRACE_GETSIGINFO, tid, 0, &si) == -1) {
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ALOGE("cannot get siginfo: %s\n", strerror(errno));
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return;
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}
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char addr_desc[32]; // ", fault addr 0x1234"
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if (signal_has_si_addr(si.si_signo, si.si_code)) {
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snprintf(addr_desc, sizeof(addr_desc), "%p", si.si_addr);
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} else {
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snprintf(addr_desc, sizeof(addr_desc), "--------");
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}
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_LOG(log, logtype::HEADER, "signal %d (%s), code %d (%s), fault addr %s\n", si.si_signo,
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get_signame(si.si_signo), si.si_code, get_sigcode(si.si_signo, si.si_code), addr_desc);
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}
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static void dump_thread_info(log_t* log, pid_t pid, pid_t tid) {
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char path[64];
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char threadnamebuf[1024];
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char* threadname = nullptr;
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FILE *fp;
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snprintf(path, sizeof(path), "/proc/%d/comm", tid);
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if ((fp = fopen(path, "r"))) {
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threadname = fgets(threadnamebuf, sizeof(threadnamebuf), fp);
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fclose(fp);
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if (threadname) {
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size_t len = strlen(threadname);
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if (len && threadname[len - 1] == '\n') {
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threadname[len - 1] = '\0';
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}
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}
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}
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// Blacklist logd, logd.reader, logd.writer, logd.auditd, logd.control ...
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static const char logd[] = "logd";
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if (threadname != nullptr && !strncmp(threadname, logd, sizeof(logd) - 1)
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&& (!threadname[sizeof(logd) - 1] || (threadname[sizeof(logd) - 1] == '.'))) {
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log->should_retrieve_logcat = false;
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}
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char procnamebuf[1024];
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char* procname = nullptr;
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snprintf(path, sizeof(path), "/proc/%d/cmdline", pid);
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if ((fp = fopen(path, "r"))) {
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procname = fgets(procnamebuf, sizeof(procnamebuf), fp);
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fclose(fp);
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}
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_LOG(log, logtype::HEADER, "pid: %d, tid: %d, name: %s >>> %s <<<\n", pid, tid,
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threadname ? threadname : "UNKNOWN", procname ? procname : "UNKNOWN");
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}
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static void dump_stack_segment(
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Backtrace* backtrace, log_t* log, uintptr_t* sp, size_t words, int label) {
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// Read the data all at once.
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word_t stack_data[words];
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size_t bytes_read = backtrace->Read(*sp, reinterpret_cast<uint8_t*>(&stack_data[0]), sizeof(word_t) * words);
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words = bytes_read / sizeof(word_t);
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std::string line;
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for (size_t i = 0; i < words; i++) {
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line = " ";
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if (i == 0 && label >= 0) {
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// Print the label once.
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line += android::base::StringPrintf("#%02d ", label);
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} else {
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line += " ";
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}
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line += android::base::StringPrintf("%" PRIPTR " %" PRIPTR, *sp, stack_data[i]);
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backtrace_map_t map;
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backtrace->FillInMap(stack_data[i], &map);
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if (BacktraceMap::IsValid(map) && !map.name.empty()) {
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line += " " + map.name;
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uintptr_t offset = 0;
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std::string func_name(backtrace->GetFunctionName(stack_data[i], &offset));
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if (!func_name.empty()) {
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line += " (" + func_name;
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if (offset) {
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line += android::base::StringPrintf("+%" PRIuPTR, offset);
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}
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line += ')';
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}
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}
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_LOG(log, logtype::STACK, "%s\n", line.c_str());
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*sp += sizeof(word_t);
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}
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}
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static void dump_stack(Backtrace* backtrace, log_t* log) {
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size_t first = 0, last;
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for (size_t i = 0; i < backtrace->NumFrames(); i++) {
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const backtrace_frame_data_t* frame = backtrace->GetFrame(i);
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if (frame->sp) {
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if (!first) {
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first = i+1;
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}
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last = i;
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}
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}
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if (!first) {
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return;
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}
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first--;
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// Dump a few words before the first frame.
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word_t sp = backtrace->GetFrame(first)->sp - STACK_WORDS * sizeof(word_t);
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dump_stack_segment(backtrace, log, &sp, STACK_WORDS, -1);
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// Dump a few words from all successive frames.
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// Only log the first 3 frames, put the rest in the tombstone.
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for (size_t i = first; i <= last; i++) {
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const backtrace_frame_data_t* frame = backtrace->GetFrame(i);
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if (sp != frame->sp) {
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_LOG(log, logtype::STACK, " ........ ........\n");
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sp = frame->sp;
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}
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if (i == last) {
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dump_stack_segment(backtrace, log, &sp, STACK_WORDS, i);
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if (sp < frame->sp + frame->stack_size) {
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_LOG(log, logtype::STACK, " ........ ........\n");
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}
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} else {
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size_t words = frame->stack_size / sizeof(word_t);
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if (words == 0) {
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words = 1;
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} else if (words > STACK_WORDS) {
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words = STACK_WORDS;
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}
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dump_stack_segment(backtrace, log, &sp, words, i);
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}
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}
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}
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static std::string get_addr_string(uintptr_t addr) {
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std::string addr_str;
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#if defined(__LP64__)
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addr_str = android::base::StringPrintf("%08x'%08x",
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static_cast<uint32_t>(addr >> 32),
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static_cast<uint32_t>(addr & 0xffffffff));
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#else
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addr_str = android::base::StringPrintf("%08x", addr);
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#endif
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return addr_str;
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}
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static void dump_abort_message(Backtrace* backtrace, log_t* log, uintptr_t address) {
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if (address == 0) {
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return;
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}
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address += sizeof(size_t); // Skip the buffer length.
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char msg[512];
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memset(msg, 0, sizeof(msg));
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char* p = &msg[0];
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while (p < &msg[sizeof(msg)]) {
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word_t data;
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size_t len = sizeof(word_t);
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if (!backtrace->ReadWord(address, &data)) {
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break;
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}
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address += sizeof(word_t);
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while (len > 0 && (*p++ = (data >> (sizeof(word_t) - len) * 8) & 0xff) != 0) {
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len--;
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}
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}
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msg[sizeof(msg) - 1] = '\0';
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_LOG(log, logtype::HEADER, "Abort message: '%s'\n", msg);
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}
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static void dump_all_maps(Backtrace* backtrace, BacktraceMap* map, log_t* log, pid_t tid) {
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bool print_fault_address_marker = false;
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uintptr_t addr = 0;
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siginfo_t si;
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memset(&si, 0, sizeof(si));
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if (ptrace(PTRACE_GETSIGINFO, tid, 0, &si) != -1) {
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print_fault_address_marker = signal_has_si_addr(si.si_signo, si.si_code);
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addr = reinterpret_cast<uintptr_t>(si.si_addr);
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} else {
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ALOGE("Cannot get siginfo for %d: %s\n", tid, strerror(errno));
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}
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ScopedBacktraceMapIteratorLock lock(map);
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_LOG(log, logtype::MAPS, "\n");
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if (!print_fault_address_marker) {
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_LOG(log, logtype::MAPS, "memory map:\n");
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} else {
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_LOG(log, logtype::MAPS, "memory map: (fault address prefixed with --->)\n");
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if (map->begin() != map->end() && addr < map->begin()->start) {
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_LOG(log, logtype::MAPS, "--->Fault address falls at %s before any mapped regions\n",
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get_addr_string(addr).c_str());
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print_fault_address_marker = false;
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}
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}
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std::string line;
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for (BacktraceMap::const_iterator it = map->begin(); it != map->end(); ++it) {
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line = " ";
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if (print_fault_address_marker) {
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if (addr < it->start) {
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_LOG(log, logtype::MAPS, "--->Fault address falls at %s between mapped regions\n",
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get_addr_string(addr).c_str());
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print_fault_address_marker = false;
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} else if (addr >= it->start && addr < it->end) {
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line = "--->";
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print_fault_address_marker = false;
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}
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}
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line += get_addr_string(it->start) + '-' + get_addr_string(it->end - 1) + ' ';
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if (it->flags & PROT_READ) {
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line += 'r';
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} else {
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line += '-';
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}
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if (it->flags & PROT_WRITE) {
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line += 'w';
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} else {
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line += '-';
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}
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if (it->flags & PROT_EXEC) {
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line += 'x';
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} else {
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line += '-';
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}
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line += android::base::StringPrintf(" %8" PRIxPTR " %8" PRIxPTR,
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it->offset, it->end - it->start);
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bool space_needed = true;
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if (it->name.length() > 0) {
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space_needed = false;
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line += " " + it->name;
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std::string build_id;
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if ((it->flags & PROT_READ) && elf_get_build_id(backtrace, it->start, &build_id)) {
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line += " (BuildId: " + build_id + ")";
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}
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}
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if (it->load_base != 0) {
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if (space_needed) {
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line += ' ';
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}
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line += android::base::StringPrintf(" (load base 0x%" PRIxPTR ")", it->load_base);
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}
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_LOG(log, logtype::MAPS, "%s\n", line.c_str());
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}
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if (print_fault_address_marker) {
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_LOG(log, logtype::MAPS, "--->Fault address falls at %s after any mapped regions\n",
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get_addr_string(addr).c_str());
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}
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}
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static void dump_backtrace_and_stack(Backtrace* backtrace, log_t* log) {
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if (backtrace->NumFrames()) {
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_LOG(log, logtype::BACKTRACE, "\nbacktrace:\n");
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dump_backtrace_to_log(backtrace, log, " ");
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_LOG(log, logtype::STACK, "\nstack:\n");
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dump_stack(backtrace, log);
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}
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}
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static void dump_thread(log_t* log, pid_t pid, pid_t tid, BacktraceMap* map,
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uintptr_t abort_msg_address, bool primary_thread) {
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log->current_tid = tid;
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if (!primary_thread) {
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_LOG(log, logtype::THREAD, "--- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---\n");
|
|
}
|
|
dump_thread_info(log, pid, tid);
|
|
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(EVENT_TAG_MAP_FILE);
|
|
}
|
|
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, pid_t pid, pid_t tid,
|
|
const std::set<pid_t>& siblings, uintptr_t abort_msg_address) {
|
|
// don't copy log messages to tombstone unless this is a dev device
|
|
bool want_logs = __android_log_is_debuggable();
|
|
|
|
_LOG(log, logtype::HEADER,
|
|
"*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***\n");
|
|
dump_header_info(log);
|
|
dump_thread(log, pid, tid, map, abort_msg_address, true);
|
|
if (want_logs) {
|
|
dump_logs(log, pid, 5);
|
|
}
|
|
|
|
if (!siblings.empty()) {
|
|
for (pid_t sibling : siblings) {
|
|
dump_thread(log, pid, sibling, map, 0, false);
|
|
}
|
|
}
|
|
|
|
if (want_logs) {
|
|
dump_logs(log, pid, 0);
|
|
}
|
|
}
|
|
|
|
// 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.
|
|
int open_tombstone(std::string* out_path) {
|
|
// In a single pass, find an available slot and, in case none
|
|
// exist, find and record the least-recently-modified file.
|
|
char path[128];
|
|
int fd = -1;
|
|
int oldest = -1;
|
|
struct stat oldest_sb;
|
|
for (int i = 0; i < MAX_TOMBSTONES; i++) {
|
|
snprintf(path, sizeof(path), TOMBSTONE_TEMPLATE, i);
|
|
|
|
struct stat sb;
|
|
if (stat(path, &sb) == 0) {
|
|
if (oldest < 0 || sb.st_mtime < oldest_sb.st_mtime) {
|
|
oldest = i;
|
|
oldest_sb.st_mtime = sb.st_mtime;
|
|
}
|
|
continue;
|
|
}
|
|
if (errno != ENOENT) continue;
|
|
|
|
fd = open(path, O_CREAT | O_EXCL | O_WRONLY | O_NOFOLLOW | O_CLOEXEC, 0600);
|
|
if (fd < 0) continue; // raced ?
|
|
|
|
if (out_path) {
|
|
*out_path = path;
|
|
}
|
|
fchown(fd, AID_SYSTEM, AID_SYSTEM);
|
|
return fd;
|
|
}
|
|
|
|
if (oldest < 0) {
|
|
ALOGE("debuggerd: failed to find a valid tombstone, default to using tombstone 0.\n");
|
|
oldest = 0;
|
|
}
|
|
|
|
// we didn't find an available file, so we clobber the oldest one
|
|
snprintf(path, sizeof(path), TOMBSTONE_TEMPLATE, oldest);
|
|
fd = open(path, O_CREAT | O_TRUNC | O_WRONLY | O_NOFOLLOW | O_CLOEXEC, 0600);
|
|
if (fd < 0) {
|
|
ALOGE("debuggerd: failed to open tombstone file '%s': %s\n", path, strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
if (out_path) {
|
|
*out_path = path;
|
|
}
|
|
fchown(fd, AID_SYSTEM, AID_SYSTEM);
|
|
return fd;
|
|
}
|
|
|
|
void engrave_tombstone(int tombstone_fd, BacktraceMap* map, pid_t pid, pid_t tid,
|
|
const std::set<pid_t>& siblings, uintptr_t abort_msg_address,
|
|
std::string* amfd_data) {
|
|
log_t log;
|
|
log.current_tid = tid;
|
|
log.crashed_tid = tid;
|
|
|
|
if (tombstone_fd < 0) {
|
|
ALOGE("debuggerd: skipping tombstone write, nothing to do.\n");
|
|
return;
|
|
}
|
|
|
|
log.tfd = tombstone_fd;
|
|
log.amfd_data = amfd_data;
|
|
dump_crash(&log, map, pid, tid, siblings, abort_msg_address);
|
|
}
|