libdebuggerd: add protobuf implementation.

This commit implements protobuf output for tombstones, along with a
translator that should emit bytewise identical output to the existing
tombstone dumping code, except for ancillary data from GWP-ASan and
Scudo, which haven't been implemented yet.

Test: setprop debug.debuggerd.translate.translate_proto_to_text 1 &&
        /data/nativetest64/debuggerd_test/debuggerd_test
Test: for TOMBSTONE in /data/tombstones/tombstone_??; do
        pbtombstone $TOMBSTONE.pb | diff $TOMBSTONE -
      done
Change-Id: Ieeece6e6d1c26eb608b00ec24e2e725e161c8c92

1 files changed, 10 insertions, 9 deletions

diff --git a/debuggerd/handler/debuggerd_fallback.cpp b/debuggerd/handler/debuggerd_fallback.cpp
index e103c82f4..feafa7377 100644
--- a/debuggerd/handler/debuggerd_fallback.cpp
+++ b/debuggerd/handler/debuggerd_fallback.cpp
@@ -92,15 +92,15 @@ static void debuggerd_fallback_trace(int output_fd, ucontext_t* ucontext) {
   __linker_disable_fallback_allocator();
 }
 
-static void debuggerd_fallback_tombstone(int output_fd, ucontext_t* ucontext, siginfo_t* siginfo,
-                                         void* abort_message) {
+static void debuggerd_fallback_tombstone(int output_fd, int proto_fd, ucontext_t* ucontext,
+                                         siginfo_t* siginfo, void* abort_message) {
   if (!__linker_enable_fallback_allocator()) {
     async_safe_format_log(ANDROID_LOG_ERROR, "libc", "fallback allocator already in use");
     return;
   }
 
-  engrave_tombstone_ucontext(output_fd, reinterpret_cast<uintptr_t>(abort_message), siginfo,
-                             ucontext);
+  engrave_tombstone_ucontext(output_fd, proto_fd, reinterpret_cast<uintptr_t>(abort_message),
+                             siginfo, ucontext);
   __linker_disable_fallback_allocator();
 }
 
@@ -232,7 +232,8 @@ static void trace_handler(siginfo_t* info, ucontext_t* ucontext) {
 
   // Fetch output fd from tombstoned.
   unique_fd tombstone_socket, output_fd;
-  if (!tombstoned_connect(getpid(), &tombstone_socket, &output_fd, kDebuggerdNativeBacktrace)) {
+  if (!tombstoned_connect(getpid(), &tombstone_socket, &output_fd, nullptr,
+                          kDebuggerdNativeBacktrace)) {
     async_safe_format_log(ANDROID_LOG_ERROR, "libc",
                           "missing crash_dump_fallback() in selinux policy?");
     goto exit;
@@ -325,10 +326,10 @@ static void crash_handler(siginfo_t* info, ucontext_t* ucontext, void* abort_mes
     _exit(1);
   }
 
-  unique_fd tombstone_socket, output_fd;
-  bool tombstoned_connected =
-      tombstoned_connect(getpid(), &tombstone_socket, &output_fd, kDebuggerdTombstone);
-  debuggerd_fallback_tombstone(output_fd.get(), ucontext, info, abort_message);
+  unique_fd tombstone_socket, output_fd, proto_fd;
+  bool tombstoned_connected = tombstoned_connect(getpid(), &tombstone_socket, &output_fd, &proto_fd,
+                                                 kDebuggerdTombstoneProto);
+  debuggerd_fallback_tombstone(output_fd.get(), proto_fd.get(), ucontext, info, abort_message);
   if (tombstoned_connected) {
     tombstoned_notify_completion(tombstone_socket.get());
   }