Add DumpKernelCrash interface

This interface receives the content of /sys/fs/pstore/dmesg-ramoops-0 for crash reporting of kernel crashes of ARCVM.
The CL to send the ramoops file is ag/12946959.

Bug: 139650101
Test: tast run arc.KernelCrash.\*
Change-Id: Ie38d4054f5a4c4d0cb4d45e53d825bb1be21dbf0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2505708Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Reviewed-by: Miriam Zimmerman <mutexlox@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Kimiyuki Onaka <kimiyuki@google.com>
Cr-Commit-Position: refs/heads/master@{#828628}

components/arc/crash_collector/arc_crash_collector_bridge.cc

@@ -71,6 +71,15 @@ void RunNativeCrashReporter(const std::string& exec_name,
     LOG(ERROR) << "Failed to run crash_reporter";
 }
 
+// Runs crash_reporter to save the kernel crash info.
+void RunKernelCrashReporter(base::ScopedFD ramoops_fd,
+                            std::vector<std::string> args) {
+  args.push_back("--arc_kernel");
+
+  if (!RunCrashReporter(args, ramoops_fd.get()))
+    LOG(ERROR) << "Failed to run crash_reporter";
+}
+
 }  // namespace
 
 namespace arc {
@@ -135,6 +144,16 @@ void ArcCrashCollectorBridge::DumpNativeCrash(const std::string& exec_name,
           CreateCrashReporterArgs()));
 }
 
+void ArcCrashCollectorBridge::DumpKernelCrash(
+    mojo::ScopedHandle ramoops_handle) {
+  base::ThreadPool::PostTask(
+      FROM_HERE, {base::WithBaseSyncPrimitives()},
+      base::BindOnce(
+          &RunKernelCrashReporter,
+          mojo::UnwrapPlatformHandle(std::move(ramoops_handle)).TakeFD(),
+          CreateCrashReporterArgs()));
+}
+
 void ArcCrashCollectorBridge::SetBuildProperties(
     const std::string& device,
     const std::string& board,

components/arc/crash_collector/arc_crash_collector_bridge.h

@@ -43,6 +43,7 @@ class ArcCrashCollectorBridge
                        int32_t pid,
                        int64_t timestamp,
                        mojo::ScopedHandle minidump_fd) override;
+  void DumpKernelCrash(mojo::ScopedHandle ramoops_handle) override;
   void SetBuildProperties(
       const std::string& device,
       const std::string& board,

components/arc/mojom/crash_collector.mojom

@@ -2,11 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Next MinVersion: 5
+// Next MinVersion: 6
 
 module arc.mojom;
 
-// Next Method ID: 3
+// Next Method ID: 4
 interface CrashCollectorHost {
   // Sends a dump for a non-native crash of the given |type|. The host reads
   // the dump from |pipe|, or rejects the dump by closing |pipe|. Note that
@@ -25,6 +25,9 @@ interface CrashCollectorHost {
                                    int32 pid,
                                    int64 timestamp,
                                    handle minidump_fd);
+
+  // Sends a dump for a kernel crash.
+  [MinVersion=5] DumpKernelCrash@3(handle ramoops_handle);
 };
 
 // Next Method ID: 2