Merge "Remove IMMS#calledFromValidUserLocked() as it's unused"

        }

    }

    // ---------------------------------------------------------------------------------------

    // Check whether or not this is a valid IPC. Assumes an IPC is valid when either

    // 1) it comes from the system process

    // 2) the calling process' user id is identical to the current user id IMMS thinks.

    @GuardedBy("ImfLock.class")

    private boolean calledFromValidUserLocked() {

        final int uid = Binder.getCallingUid();

        final int userId = UserHandle.getUserId(uid);

        if (DEBUG) {

            Slog.d(TAG, "--- calledFromForegroundUserOrSystemProcess ? "

                    + "calling uid = " + uid + " system uid = " + Process.SYSTEM_UID

                    + " calling userId = " + userId + ", foreground user id = "

                    + mSettings.getCurrentUserId() + ", calling pid = " + Binder.getCallingPid()

                    + InputMethodUtils.getApiCallStack());

        }

        if (uid == Process.SYSTEM_UID) {

            return true;

        }

        if (userId == mSettings.getCurrentUserId()) {

            return true;

        }

        // Caveat: A process which has INTERACT_ACROSS_USERS_FULL gets results for the

        // foreground user, not for the user of that process. Accordingly InputMethodManagerService

        // must not manage background users' states in any functions.

        // Note that privacy-sensitive IPCs, such as setInputMethod, are still securely guarded

        // by a token.

        if (mContext.checkCallingOrSelfPermission(

                android.Manifest.permission.INTERACT_ACROSS_USERS_FULL)

                == PackageManager.PERMISSION_GRANTED) {

            if (DEBUG) {

                Slog.d(TAG, "--- Access granted because the calling process has "

                        + "the INTERACT_ACROSS_USERS_FULL permission");

            }

            return true;

        }

        // TODO(b/34886274): The semantics of this verification is actually not well-defined.

        Slog.w(TAG, "--- IPC called from background users. Ignore. callers="

                + Debug.getCallers(10));

        return false;

    }

    /**

     * Returns true iff the caller is identified to be the current input method with the token.

     * @param token The window token given to the input method when it was started.