init: init_kill_services_test

Kill processes and make sure the phone recovers. This adds a basic level
of testing, but it could be improved by:
- trying to kill all running processes on the device
- improving metrics for 'recovery'

Bug: 148236233
Test: init_kill_services_test
Change-Id: I8aaca7bf4bb0be588decf741d1f6e1c5787cea84

TEST_MAPPING

@@ -27,6 +27,9 @@
     {
       "name": "fs_mgr_vendor_overlay_test"
     },
+    {
+      "name": "init_kill_services_test"
+    },
     {
       "name": "libbase_test"
     },

init/test_kill_services/Android.bp

@@ -0,0 +1,7 @@
+cc_test {
+    name: "init_kill_services_test",
+    srcs: ["init_kill_services_test.cpp"],
+    shared_libs: ["libbase"],
+    test_suites: ["general-tests"],
+    require_root: true,
+}

init/test_kill_services/init_kill_services_test.cpp

@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <gtest/gtest.h>
+
+#include <android-base/properties.h>
+
+#include <iostream>
+
+using ::android::base::GetProperty;
+using ::android::base::SetProperty;
+
+void ExpectKillingServiceRecovers(const std::string& service_name) {
+    const std::string status_prop = "init.svc." + service_name;
+    const std::string pid_prop = "init.svc_debug_pid." + service_name;
+
+    const std::string initial_pid = GetProperty(pid_prop, "");
+
+    EXPECT_EQ("running", GetProperty(status_prop, "")) << status_prop;
+    EXPECT_NE("", initial_pid) << pid_prop;
+
+    EXPECT_EQ(0, system(("kill -9 " + initial_pid).c_str()));
+
+    constexpr size_t kMaxWaitMilliseconds = 10000;
+    constexpr size_t kRetryWaitMilliseconds = 100;
+
+    constexpr size_t kRetryTimes = kMaxWaitMilliseconds / kRetryWaitMilliseconds;
+
+    for (size_t retry = 0; retry < kRetryTimes; retry++) {
+        const std::string& pid = GetProperty(pid_prop, "");
+        if (pid != initial_pid && pid != "") break;
+        usleep(kRetryWaitMilliseconds * 1000);
+    }
+
+    // svc_debug_pid is set after svc property
+    EXPECT_EQ("running", GetProperty(status_prop, ""));
+}
+
+class InitKillServicesTest : public ::testing::TestWithParam<std::string> {};
+
+TEST_P(InitKillServicesTest, KillCriticalProcesses) {
+    ExpectKillingServiceRecovers(GetParam());
+
+    // sanity check init is still responding
+    EXPECT_TRUE(SetProperty("test.death.test", "asdf"));
+    EXPECT_EQ(GetProperty("test.death.test", ""), "asdf");
+    EXPECT_TRUE(SetProperty("test.death.test", ""));
+}
+
+static inline std::string PrintName(const testing::TestParamInfo<std::string>& info) {
+    return info.param;
+}
+
+INSTANTIATE_TEST_CASE_P(DeathTest, InitKillServicesTest,
+                        ::testing::Values("lmkd", "ueventd", "hwservicemanager", "servicemanager"),
+                        PrintName);