Show event log when application data is deleted

Add event log to show the information of trigger
for deleting application data.

Log Format:
- Event log name : installer_clear_app_data_caller
- Caller PID
- Caller UID
- package which is the target for deleting data
- flag

- Event log name : installer_clear_app_data_call_stack
- method name on Call stack
- class name on Call stack
- file name on Call stack
- line number on Call stack

- Event log name : pm_clear_app_data_caller
- Caller PID
- Caller UID
- package which is the target for deleting data

- Event log name : am_clear_app_data_caller
- Caller PID
- Caller UID
- package which is the target for deleting data

Manual test steps:
Start a logcat viewer on a adb host with the device under test connected
1. Do $ adb logcat -b events | grep clear_app_data
Delete app data on the device under test.
2. Go to Settings->Apps->All apps
4. Click on an app, for example Chrome
5. Click on [Storage and cache]
6. Click on [Clear storage]
7. Click on [Delete]
8. Observe: See output from the adb host with the logcat command.
10-17 13:01:57.649  1766  3657 I am_clear_app_data_caller: [7093,10268,com.android.chrome]
10-17 13:01:57.671  1766  3657 I pm_clear_app_data_caller: [1766,1000,com.android.chrome]
10-17 13:01:57.680  1766  2401 I installer_clear_app_data_caller: [1766,1000,com.android.chrome,7]
10-17 13:01:57.680  1766  2401 I installer_clear_app_data_call_stack: [clearAppData,com.android.server.pm.Installer,Installer.java,447]
10-17 13:01:57.680  1766  2401 I installer_clear_app_data_call_stack: [clearAppDataLeafLIF,com.android.server.pm.AppDataHelper,AppDataHelper.java,580]
10-17 13:01:57.680  1766  2401 I installer_clear_app_data_call_stack: [clearAppDataLIF,com.android.server.pm.AppDataHelper,AppDataHelper.java,565]
10-17 13:01:57.680  1766  2401 I installer_clear_app_data_call_stack: [clearApplicationUserDataLIF,com.android.server.pm.PackageManagerService,PackageManagerService.java,3495]
10-17 13:01:57.680  1766  2401 I installer_clear_app_data_call_stack: [-$$Nest$mclearApplicationUserDataLIF,com.android.server.pm.PackageManagerService,PackageManagerService.java,0]
10-17 13:01:57.680  1766  2401 I installer_clear_app_data_call_stack: [run,com.android.server.pm.PackageManagerService$IPackageManagerImpl$1,PackageManagerService.java,4789]
10-17 13:01:57.680  1766  2401 I installer_clear_app_data_call_stack: [handleCallback,android.os.Handler,Handler.java,958]
10-17 13:01:57.680  1766  2401 I installer_clear_app_data_call_stack: [dispatchMessage,android.os.Handler,Handler.java,99]
10-17 13:01:57.680  1766  2401 I installer_clear_app_data_call_stack: [loopOnce,android.os.Looper,Looper.java,205]
10-17 13:01:57.680  1766  2401 I installer_clear_app_data_call_stack: [loop,android.os.Looper,Looper.java,294]
10-17 13:01:57.680  1766  2401 I installer_clear_app_data_call_stack: [run,android.os.HandlerThread,HandlerThread.java,67]
10-17 13:01:57.680  1766  2401 I installer_clear_app_data_call_stack: [run,com.android.server.ServiceThread,ServiceThread.java,46]

Bug: 305787657
Test: manual
Change-Id: I9396c0fc23d43f1c88b268a0596e8682dd5a8377

5 files changed, 42 insertions, 0 deletions

diff --git a/services/core/java/com/android/server/EventLogTags.logtags b/services/core/java/com/android/server/EventLogTags.logtags
index b67e62703067..a71966b916c9 100644
--- a/services/core/java/com/android/server/EventLogTags.logtags
+++ b/services/core/java/com/android/server/EventLogTags.logtags
@@ -179,6 +179,15 @@ option java_package com.android.server
 3130 pm_snapshot_stats (build_count|1|1),(reuse_count|1|1),(big_builds|1|1),(short_lived|1|1),(max_build_time|1|3),(cumm_build_time|2|3)
 # Snapshot rebuild instance
 3131 pm_snapshot_rebuild (build_time|1|3),(lifetime|1|3)
+# Caller information to clear application data
+1003160 pm_clear_app_data_caller (pid|1),(uid|1),(package|3)
+# ---------------------------
+# Installer.java
+# ---------------------------
+# Caller Information to clear application data
+1003200 installer_clear_app_data_caller (pid|1),(uid|1),(package|3),(flags|1)
+# Call stack to clear application data
+1003201 installer_clear_app_data_call_stack (method|3),(class|3),(file|3),(line|1)
 
 # ---------------------------
 # InputMethodManagerService.java
diff --git a/services/core/java/com/android/server/am/ActivityManagerService.java b/services/core/java/com/android/server/am/ActivityManagerService.java
index e74371e6a66b..c0da30d0e153 100644
--- a/services/core/java/com/android/server/am/ActivityManagerService.java
+++ b/services/core/java/com/android/server/am/ActivityManagerService.java
@@ -3468,6 +3468,7 @@ public class ActivityManagerService extends IActivityManager.Stub
         enforceNotIsolatedCaller("clearApplicationUserData");
         int uid = Binder.getCallingUid();
         int pid = Binder.getCallingPid();
+        EventLog.writeEvent(EventLogTags.AM_CLEAR_APP_DATA_CALLER, pid, uid, packageName);
         final int resolvedUserId = mUserController.handleIncomingUser(pid, uid, userId, false,
                 ALLOW_FULL_ONLY, "clearApplicationUserData", null);
 
diff --git a/services/core/java/com/android/server/am/EventLogTags.logtags b/services/core/java/com/android/server/am/EventLogTags.logtags
index 9e9db6aff699..931914f17729 100644
--- a/services/core/java/com/android/server/am/EventLogTags.logtags
+++ b/services/core/java/com/android/server/am/EventLogTags.logtags
@@ -129,3 +129,6 @@ option java_package com.android.server.am
 
 # Intent Sender redirect for UserHandle.USER_CURRENT
 30110 am_intent_sender_redirect_user (userId|1|5)
+
+# Caller information to clear application data
+1030002 am_clear_app_data_caller (pid|1),(uid|1),(package|3)
diff --git a/services/core/java/com/android/server/pm/Installer.java b/services/core/java/com/android/server/pm/Installer.java
index 9ac983dfebeb..c401dab3a482 100644
--- a/services/core/java/com/android/server/pm/Installer.java
+++ b/services/core/java/com/android/server/pm/Installer.java
@@ -24,6 +24,7 @@ import android.annotation.Nullable;
 import android.annotation.UserIdInt;
 import android.content.Context;
 import android.content.pm.PackageStats;
+import android.os.Binder;
 import android.os.Build;
 import android.os.CreateAppDataArgs;
 import android.os.CreateAppDataResult;
@@ -34,9 +35,11 @@ import android.os.RemoteException;
 import android.os.ServiceManager;
 import android.os.storage.CrateMetadata;
 import android.text.format.DateUtils;
+import android.util.EventLog;
 import android.util.Slog;
 
 import com.android.internal.os.BackgroundThread;
+import com.android.server.EventLogTags;
 import com.android.server.SystemService;
 
 import dalvik.system.BlockGuard;
@@ -438,6 +441,26 @@ public class Installer extends SystemService {
         if (!checkBeforeRemote()) return;
         try {
             mInstalld.clearAppData(uuid, packageName, userId, flags, ceDataInode);
+
+            final StackTraceElement[] elements = Thread.currentThread().getStackTrace();
+            String className;
+            String methodName;
+            String fileName;
+            int lineNumber;
+            final int pid = Binder.getCallingPid();
+            final int uid = Binder.getCallingUid();
+            EventLog.writeEvent(EventLogTags.INSTALLER_CLEAR_APP_DATA_CALLER, pid, uid, packageName,
+                    flags);
+            // Skip the first two elements since they are always the same, ie
+            // Thread#getStackTrace() and VMStack#getThreadStackTrace()
+            for (int i = 2; i < elements.length; i++) {
+                className = elements[i].getClassName();
+                methodName = elements[i].getMethodName();
+                fileName = elements[i].getFileName();
+                lineNumber = elements[i].getLineNumber();
+                EventLog.writeEvent(EventLogTags.INSTALLER_CLEAR_APP_DATA_CALL_STACK, methodName,
+                        className, fileName, lineNumber);
+            }
         } catch (Exception e) {
             throw InstallerException.from(e);
         }
diff --git a/services/core/java/com/android/server/pm/PackageManagerService.java b/services/core/java/com/android/server/pm/PackageManagerService.java
index daf3617be91c..a1c435af0452 100644
--- a/services/core/java/com/android/server/pm/PackageManagerService.java
+++ b/services/core/java/com/android/server/pm/PackageManagerService.java
@@ -4729,6 +4729,9 @@ public class PackageManagerService implements PackageSender, TestUtilityService
                 throw new SecurityException("Cannot clear data for a protected package: "
                         + packageName);
             }
+            final int callingPid = Binder.getCallingPid();
+            EventLog.writeEvent(EventLogTags.PM_CLEAR_APP_DATA_CALLER, callingPid, callingUid,
+                    packageName);
 
             // Queue up an async operation since the package deletion may take a little while.
             mHandler.post(new Runnable() {
@@ -4861,6 +4864,9 @@ public class PackageManagerService implements PackageSender, TestUtilityService
                     /* checkShell= */ false, "delete application cache files");
             final int hasAccessInstantApps = mContext.checkCallingOrSelfPermission(
                     android.Manifest.permission.ACCESS_INSTANT_APPS);
+            final int callingPid = Binder.getCallingPid();
+            EventLog.writeEvent(EventLogTags.PM_CLEAR_APP_DATA_CALLER, callingPid, callingUid,
+                    packageName);
 
             // Queue up an async operation since the package deletion may take a little while.
             mHandler.post(() -> {