ActivityManagerService#isAppForeground now checks if the caller has the
permission to view if an app is in the foreground.
Bug:
115384617
Test: cts-tradefed run cts -m CtsSecurityTestCases -t android.security.cts.ActivityManagerTest#testIsAppInForegroundNormal
Test: cts-tradefed run cts -m CtsSecurityTestCases -t android.security.cts.ActivityManagerTest#testIsAppInForegroundMalicious
Change-Id: I9602c89b2d40036e525c38960a08326dc74c6682
(cherry picked from commit
ad02e59ac2cd3e6180e02fd60e6dedd8177c7b6e)
}
/**
+ * Whether a UID belongs to a system core component or not.
+ * @hide
+ */
+ public static boolean isCore(int uid) {
+ if (uid >= 0) {
+ final int appId = getAppId(uid);
+ return appId < Process.FIRST_APPLICATION_UID;
+ } else {
+ return false;
+ }
+ }
+
+ /**
* Returns the user for a given uid.
* @param uid A uid for an application running in a particular user.
* @return A {@link UserHandle} for that user.
@Override
public boolean isAppForeground(int uid) throws RemoteException {
+ int callerUid = Binder.getCallingUid();
+ if (UserHandle.isCore(callerUid) || callerUid == uid) {
+ return isAppForegroundInternal(uid);
+ }
+ return false;
+ }
+
+ private boolean isAppForegroundInternal(int uid) {
synchronized (this) {
UidRecord uidRec = mActiveUids.get(uid);
if (uidRec == null || uidRec.idle) {