Merge "BG-FGS-start while-in-use permission restriction improvement." into rvc-dev

3 files changed, 112 insertions, 21 deletions

diff --git a/services/core/java/com/android/server/am/ActiveServices.java b/services/core/java/com/android/server/am/ActiveServices.java
index b8de4a759b60..c82a45feb682 100644
--- a/services/core/java/com/android/server/am/ActiveServices.java
+++ b/services/core/java/com/android/server/am/ActiveServices.java
@@ -734,11 +734,8 @@ public final class ActiveServices {
         }
         ComponentName cmp = startServiceInnerLocked(smap, service, r, callerFg, addToStarting);
 
-        if (!r.mAllowWhileInUsePermissionInFgs) {
-            r.mAllowWhileInUsePermissionInFgs =
-                    shouldAllowWhileInUsePermissionInFgsLocked(callingPackage, callingPid,
-                            callingUid, service, r, allowBackgroundActivityStarts);
-        }
+        setFgsRestrictionLocked(callingPackage, callingPid, callingUid, r,
+                allowBackgroundActivityStarts);
 
         return cmp;
     }
@@ -1400,14 +1397,6 @@ public final class ActiveServices {
                         +  String.format("0x%08X", manifestType)
                         + " in service element of manifest file");
                 }
-                // If the foreground service is not started from TOP process, do not allow it to
-                // have while-in-use location/camera/microphone access.
-                if (!r.mAllowWhileInUsePermissionInFgs) {
-                    Slog.w(TAG,
-                            "Foreground service started from background can not have "
-                                    + "location/camera/microphone access: service "
-                                    + r.shortInstanceName);
-                }
             }
             boolean alreadyStartedOp = false;
             boolean stopProcStatsOp = false;
@@ -1455,6 +1444,56 @@ public final class ActiveServices {
                     ignoreForeground = true;
                 }
 
+                if (!ignoreForeground) {
+                    if (r.mStartForegroundCount == 0) {
+                        /*
+                        If the service was started with startService(), not
+                        startForegroundService(), and if startForeground() isn't called within
+                        mFgsStartForegroundTimeoutMs, then we check the state of the app
+                        (who owns the service, which is the app that called startForeground())
+                        again. If the app is in the foreground, or in any other cases where
+                        FGS-starts are allowed, then we still allow the FGS to be started.
+                        Otherwise, startForeground() would fail.
+
+                        If the service was started with startForegroundService(), then the service
+                        must call startForeground() within a timeout anyway, so we don't need this
+                        check.
+                        */
+                        if (!r.fgRequired) {
+                            final long delayMs = SystemClock.elapsedRealtime() - r.createRealTime;
+                            if (delayMs > mAm.mConstants.mFgsStartForegroundTimeoutMs) {
+                                resetFgsRestrictionLocked(r);
+                                setFgsRestrictionLocked(r.serviceInfo.packageName, r.app.pid,
+                                        r.appInfo.uid, r, false);
+                                EventLog.writeEvent(0x534e4554, "183147114",
+                                        r.appInfo.uid,
+                                        "call setFgsRestrictionLocked again due to "
+                                                + "startForegroundTimeout");
+                            }
+                        }
+                    } else if (r.mStartForegroundCount >= 1) {
+                        // The second or later time startForeground() is called after service is
+                        // started. Check for app state again.
+                        final long delayMs = SystemClock.elapsedRealtime() -
+                                r.mLastSetFgsRestrictionTime;
+                        if (delayMs > mAm.mConstants.mFgsStartForegroundTimeoutMs) {
+                            setFgsRestrictionLocked(r.serviceInfo.packageName, r.app.pid,
+                                    r.appInfo.uid, r, false);
+                            EventLog.writeEvent(0x534e4554, "183147114", r.appInfo.uid,
+                                    "call setFgsRestrictionLocked for "
+                                            + (r.mStartForegroundCount + 1) + "th startForeground");
+                        }
+                    }
+                    // If the foreground service is not started from TOP process, do not allow it to
+                    // have while-in-use location/camera/microphone access.
+                    if (!r.mAllowWhileInUsePermissionInFgs) {
+                        Slog.w(TAG,
+                                "Foreground service started from background can not have "
+                                        + "location/camera/microphone access: service "
+                                        + r.shortInstanceName);
+                    }
+                }
+
                 // Apps under strict background restrictions simply don't get to have foreground
                 // services, so now that we've enforced the startForegroundService() contract
                 // we only do the machinery of making the service foreground when the app
@@ -1490,6 +1529,7 @@ public final class ActiveServices {
                             active.mNumActive++;
                         }
                         r.isForeground = true;
+                        r.mStartForegroundCount++;
                         if (!stopProcStatsOp) {
                             ServiceState stracker = r.getTracker();
                             if (stracker != null) {
@@ -1548,6 +1588,7 @@ public final class ActiveServices {
                     decActiveForegroundAppLocked(smap, r);
                 }
                 r.isForeground = false;
+                resetFgsRestrictionLocked(r);
                 ServiceState stracker = r.getTracker();
                 if (stracker != null) {
                     stracker.setForeground(false, mAm.mProcessStats.getMemFactorLocked(),
@@ -2107,12 +2148,7 @@ public final class ActiveServices {
                 }
             }
 
-            if (!s.mAllowWhileInUsePermissionInFgs) {
-                s.mAllowWhileInUsePermissionInFgs =
-                        shouldAllowWhileInUsePermissionInFgsLocked(callingPackage,
-                                callingPid, callingUid,
-                                service, s, false);
-            }
+            setFgsRestrictionLocked(callingPackage, callingPid, callingUid, s, false);
 
             if (s.app != null) {
                 if ((flags&Context.BIND_TREAT_LIKE_ACTIVITY) != 0) {
@@ -3408,7 +3444,7 @@ public final class ActiveServices {
         r.isForeground = false;
         r.foregroundId = 0;
         r.foregroundNoti = null;
-        r.mAllowWhileInUsePermissionInFgs = false;
+        resetFgsRestrictionLocked(r);
 
         // Clear start entries.
         r.clearDeliveredStartsLocked();
@@ -4889,7 +4925,7 @@ public final class ActiveServices {
      * @return true if allow, false otherwise.
      */
     private boolean shouldAllowWhileInUsePermissionInFgsLocked(String callingPackage,
-            int callingPid, int callingUid, Intent intent, ServiceRecord r,
+            int callingPid, int callingUid, ServiceRecord r,
             boolean allowBackgroundActivityStarts) {
         // Is the background FGS start restriction turned on?
         if (!mAm.mConstants.mFlagBackgroundFgsStartRestrictionEnabled) {
@@ -4960,4 +4996,33 @@ public final class ActiveServices {
         }
         return false;
     }
+
+    boolean canAllowWhileInUsePermissionInFgsLocked(int callingPid, int callingUid,
+            String callingPackage) {
+        return shouldAllowWhileInUsePermissionInFgsLocked(
+                callingPackage, callingPid, callingUid, null, false);
+    }
+
+    /**
+     * In R, mAllowWhileInUsePermissionInFgs is to allow while-in-use permissions in foreground
+     *  service or not. while-in-use permissions in FGS started from background might be restricted.
+     * @param callingPackage caller app's package name.
+     * @param callingUid caller app's uid.
+     * @param r the service to start.
+     * @return true if allow, false otherwise.
+     */
+    private void setFgsRestrictionLocked(String callingPackage,
+            int callingPid, int callingUid, ServiceRecord r,
+            boolean allowBackgroundActivityStarts) {
+        r.mLastSetFgsRestrictionTime = SystemClock.elapsedRealtime();
+        if (!r.mAllowWhileInUsePermissionInFgs) {
+            r.mAllowWhileInUsePermissionInFgs = shouldAllowWhileInUsePermissionInFgsLocked(
+                    callingPackage, callingPid, callingUid, r, allowBackgroundActivityStarts);
+        }
+    }
+
+    private void resetFgsRestrictionLocked(ServiceRecord r) {
+        r.mAllowWhileInUsePermissionInFgs = false;
+        r.mLastSetFgsRestrictionTime = 0;
+    }
 }
diff --git a/services/core/java/com/android/server/am/ActivityManagerConstants.java b/services/core/java/com/android/server/am/ActivityManagerConstants.java
index 135ac9a7846e..cc1bda76812c 100644
--- a/services/core/java/com/android/server/am/ActivityManagerConstants.java
+++ b/services/core/java/com/android/server/am/ActivityManagerConstants.java
@@ -87,6 +87,7 @@ final class ActivityManagerConstants extends ContentObserver {
     static final String KEY_PROCESS_START_ASYNC = "process_start_async";
     static final String KEY_MEMORY_INFO_THROTTLE_TIME = "memory_info_throttle_time";
     static final String KEY_TOP_TO_FGS_GRACE_DURATION = "top_to_fgs_grace_duration";
+    static final String KEY_FGS_START_FOREGROUND_TIMEOUT = "fgs_start_foreground_timeout";
     static final String KEY_PENDINGINTENT_WARNING_THRESHOLD = "pendingintent_warning_threshold";
 
     private static final int DEFAULT_MAX_CACHED_PROCESSES = 32;
@@ -120,6 +121,7 @@ final class ActivityManagerConstants extends ContentObserver {
     private static final boolean DEFAULT_PROCESS_START_ASYNC = true;
     private static final long DEFAULT_MEMORY_INFO_THROTTLE_TIME = 5*60*1000;
     private static final long DEFAULT_TOP_TO_FGS_GRACE_DURATION = 15 * 1000;
+    private static final int DEFAULT_FGS_START_FOREGROUND_TIMEOUT_MS = 10 * 1000;
     private static final int DEFAULT_PENDINGINTENT_WARNING_THRESHOLD = 2000;
 
     // Flag stored in the DeviceConfig API.
@@ -272,6 +274,12 @@ final class ActivityManagerConstants extends ContentObserver {
     // this long.
     public long TOP_TO_FGS_GRACE_DURATION = DEFAULT_TOP_TO_FGS_GRACE_DURATION;
 
+    /**
+     * When service started from background, before the timeout it can be promoted to FGS by calling
+     * Service.startForeground().
+     */
+    volatile long mFgsStartForegroundTimeoutMs = DEFAULT_FGS_START_FOREGROUND_TIMEOUT_MS;
+
     // Indicates whether the activity starts logging is enabled.
     // Controlled by Settings.Global.ACTIVITY_STARTS_LOGGING_ENABLED
     volatile boolean mFlagActivityStartsLoggingEnabled;
@@ -415,6 +423,9 @@ final class ActivityManagerConstants extends ContentObserver {
                             case KEY_MIN_ASSOC_LOG_DURATION:
                                 updateMinAssocLogDuration();
                                 break;
+                            case KEY_FGS_START_FOREGROUND_TIMEOUT:
+                                updateFgsStartForegroundTimeout();
+                                break;
                             default:
                                 break;
                         }
@@ -687,6 +698,13 @@ final class ActivityManagerConstants extends ContentObserver {
                 /* defaultValue */ DEFAULT_MIN_ASSOC_LOG_DURATION);
     }
 
+    private void updateFgsStartForegroundTimeout() {
+        mFgsStartForegroundTimeoutMs = DeviceConfig.getLong(
+                DeviceConfig.NAMESPACE_ACTIVITY_MANAGER,
+                KEY_FGS_START_FOREGROUND_TIMEOUT,
+                DEFAULT_FGS_START_FOREGROUND_TIMEOUT_MS);
+    }
+
     void dump(PrintWriter pw) {
         pw.println("ACTIVITY MANAGER SETTINGS (dumpsys activity settings) "
                 + Settings.Global.ACTIVITY_MANAGER_CONSTANTS + ":");
@@ -759,6 +777,8 @@ final class ActivityManagerConstants extends ContentObserver {
         pw.println(Arrays.toString(IMPERCEPTIBLE_KILL_EXEMPT_PACKAGES.toArray()));
         pw.print("  "); pw.print(KEY_MIN_ASSOC_LOG_DURATION); pw.print("=");
         pw.println(MIN_ASSOC_LOG_DURATION);
+        pw.print("  "); pw.print(KEY_FGS_START_FOREGROUND_TIMEOUT); pw.print("=");
+        pw.println(mFgsStartForegroundTimeoutMs);
 
         pw.println();
         if (mOverrideMaxCachedProcesses >= 0) {
diff --git a/services/core/java/com/android/server/am/ServiceRecord.java b/services/core/java/com/android/server/am/ServiceRecord.java
index 9c96e6e02566..5583c5129287 100644
--- a/services/core/java/com/android/server/am/ServiceRecord.java
+++ b/services/core/java/com/android/server/am/ServiceRecord.java
@@ -138,6 +138,10 @@ final class ServiceRecord extends Binder implements ComponentName.WithComponentN
     // allow while-in-use permissions in foreground service or not.
     // while-in-use permissions in FGS started from background might be restricted.
     boolean mAllowWhileInUsePermissionInFgs;
+    // The number of times Service.startForeground() is called;
+    int mStartForegroundCount;
+    // Last time mAllowWhileInUsePermissionInFgs is set.
+    long mLastSetFgsRestrictionTime;
 
     // the most recent package that start/bind this service.
     String mRecentCallingPackage;
@@ -400,6 +404,8 @@ final class ServiceRecord extends Binder implements ComponentName.WithComponentN
         }
         pw.print(prefix); pw.print("allowWhileInUsePermissionInFgs=");
                 pw.println(mAllowWhileInUsePermissionInFgs);
+        pw.print(prefix); pw.print("startForegroundCount=");
+        pw.println(mStartForegroundCount);
         pw.print(prefix); pw.print("recentCallingPackage=");
                 pw.println(mRecentCallingPackage);
         if (delayed) {