Synchronize calls to no restricted mode lists

This is to avoid concurrent modification errors.

Fixes: 390483439
Test: atest CtsBackupTestCases
Flag: EXEMPT bug fix
Change-Id: I8d75ea1fc15705ee847e911452b6ba0029d7a000

1 files changed, 17 insertions, 10 deletions

diff --git a/services/backup/java/com/android/server/backup/BackupAgentConnectionManager.java b/services/backup/java/com/android/server/backup/BackupAgentConnectionManager.java
index d8fbde4115d9..9a353fbc45bf 100644
--- a/services/backup/java/com/android/server/backup/BackupAgentConnectionManager.java
+++ b/services/backup/java/com/android/server/backup/BackupAgentConnectionManager.java
@@ -76,7 +76,9 @@ public class BackupAgentConnectionManager {
     @Nullable
     private BackupAgentConnection mCurrentConnection;
 
+    @GuardedBy("mAgentConnectLock")
     private final ArraySet<String> mRestoreNoRestrictedModePackages = new ArraySet<>();
+    @GuardedBy("mAgentConnectLock")
     private final ArraySet<String> mBackupNoRestrictedModePackages = new ArraySet<>();
 
     private final IActivityManager mActivityManager;
@@ -322,14 +324,16 @@ public class BackupAgentConnectionManager {
      */
     public void setNoRestrictedModePackages(Set<String> packageNames,
             @BackupAnnotations.OperationType int opType) {
-        if (opType == BackupAnnotations.OperationType.BACKUP) {
-            mBackupNoRestrictedModePackages.clear();
-            mBackupNoRestrictedModePackages.addAll(packageNames);
-        } else if (opType == BackupAnnotations.OperationType.RESTORE) {
-            mRestoreNoRestrictedModePackages.clear();
-            mRestoreNoRestrictedModePackages.addAll(packageNames);
-        } else {
-            throw new IllegalArgumentException("opType must be BACKUP or RESTORE");
+        synchronized (mAgentConnectLock) {
+            if (opType == BackupAnnotations.OperationType.BACKUP) {
+                mBackupNoRestrictedModePackages.clear();
+                mBackupNoRestrictedModePackages.addAll(packageNames);
+            } else if (opType == BackupAnnotations.OperationType.RESTORE) {
+                mRestoreNoRestrictedModePackages.clear();
+                mRestoreNoRestrictedModePackages.addAll(packageNames);
+            } else {
+                throw new IllegalArgumentException("opType must be BACKUP or RESTORE");
+            }
         }
     }
 
@@ -338,8 +342,10 @@ public class BackupAgentConnectionManager {
      * restore.
      */
     public void clearNoRestrictedModePackages() {
-        mBackupNoRestrictedModePackages.clear();
-        mRestoreNoRestrictedModePackages.clear();
+        synchronized (mAgentConnectLock) {
+            mBackupNoRestrictedModePackages.clear();
+            mRestoreNoRestrictedModePackages.clear();
+        }
     }
 
     /**
@@ -353,6 +359,7 @@ public class BackupAgentConnectionManager {
      * {@link #mRestoreNoRestrictedModePackages} so this method will immediately return without
      * any IPC to the transport.
      */
+    @GuardedBy("mAgentConnectLock")
     private boolean shouldUseRestrictedBackupModeForPackage(
             @BackupAnnotations.OperationType int mode, String packageName) {
         // Key/Value apps are never put in restricted mode.