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Commit 5d8419c8 authored by Josh Gao's avatar Josh Gao Committed by android-build-merger
Browse files

Merge "debuggerd_handler: add and use fatal_errno." am: bcabf103 am: 9a4933e1 

am: 90117d66

Change-Id: I80376c6ce26acd60e3e92ef51bf3e2854017b1d5
parents 4a85c4ca 90117d66

debuggerd/handler/debuggerd_handler.cpp

+22 −11
Original line number Diff line number Diff line
@@ -67,11 +67,22 @@ static debuggerd_callbacks_t g_callbacks; 
static pthread_mutex_t crash_mutex = PTHREAD_MUTEX_INITIALIZER;



// Don't use __libc_fatal because it exits via abort, which might put us back into a signal handler.

#define fatal(...)                                             \

  do {                                                         \

    __libc_format_log(ANDROID_LOG_FATAL, "libc", __VA_ARGS__); \

    _exit(1);                                                  \

  } while (0)

static void __noreturn __printflike(1, 2) fatal(const char* fmt, ...) {

  va_list args;

  va_start(args, fmt);

  __libc_format_log_va_list(ANDROID_LOG_FATAL, "libc", fmt, args);

  _exit(1);

}



static void __noreturn __printflike(1, 2) fatal_errno(const char* fmt, ...) {

  int err = errno;

  va_list args;

  va_start(args, fmt);



  char buf[4096];

  vsnprintf(buf, sizeof(buf), fmt, args);

  fatal("%s: %s", buf, strerror(err));

}



/*

 * Writes a summary of the signal to the log file.  We do this so that, if
@@ -192,7 +203,7 @@ static int debuggerd_dispatch_pseudothread(void* arg) { 


  int pipefds[2];

  if (pipe(pipefds) != 0) {

    fatal("failed to create pipe");

    fatal_errno("failed to create pipe");

  }



  // Don't use fork(2) to avoid calling pthread_atfork handlers.
@@ -209,7 +220,7 @@ static int debuggerd_dispatch_pseudothread(void* arg) { 
    snprintf(buf, sizeof(buf), "%d", thread_info->crashing_tid);

    execl(CRASH_DUMP_PATH, CRASH_DUMP_NAME, buf, nullptr);



    fatal("exec failed: %s", strerror(errno));

    fatal_errno("exec failed");

  } else {

    close(pipefds[1]);

    char buf[4];
@@ -264,7 +275,7 @@ static void resend_signal(siginfo_t* info, bool crash_dump_started) { 
  if (crash_dump_started || info->si_signo != DEBUGGER_SIGNAL) {

    int rc = syscall(SYS_rt_tgsigqueueinfo, getpid(), gettid(), info->si_signo, info);

    if (rc != 0) {

      fatal("failed to resend signal during crash: %s", strerror(errno));

      fatal_errno("failed to resend signal during crash");

    }

  }
@@ -336,7 +347,7 @@ static void debuggerd_signal_handler(int signal_number, siginfo_t* info, void*) 
          CLONE_THREAD | CLONE_SIGHAND | CLONE_VM | CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID,

          &thread_info, nullptr, nullptr, &thread_info.pseudothread_tid);

  if (child_pid == -1) {

    fatal("failed to spawn debuggerd dispatch thread: %s", strerror(errno));

    fatal_errno("failed to spawn debuggerd dispatch thread");

  }



  // Wait for the child to start...
@@ -366,12 +377,12 @@ void debuggerd_init(debuggerd_callbacks_t* callbacks) { 
  void* thread_stack_allocation =

    mmap(nullptr, PAGE_SIZE * 3, PROT_NONE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);

  if (thread_stack_allocation == MAP_FAILED) {

    fatal("failed to allocate debuggerd thread stack");

    fatal_errno("failed to allocate debuggerd thread stack");

  }



  char* stack = static_cast<char*>(thread_stack_allocation) + PAGE_SIZE;

  if (mprotect(stack, PAGE_SIZE, PROT_READ | PROT_WRITE) != 0) {

    fatal("failed to mprotect debuggerd thread stack");

    fatal_errno("failed to mprotect debuggerd thread stack");

  }



  // Stack grows negatively, set it to the last byte in the page...