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Commit 48e9a567 authored by Kenny Root's avatar Kenny Root
Browse files

RebootEscrowManager: service-specific exceptions 

Instead of crashing when encountering a service-specific exception, log
the error and continue operation. This will allow vendors to indicate
their HAL is not working when a call comes in without crashing the
system_server thread.

Bug: 158774347
Test: atest RebootEscrowManagerTests
Change-Id: Ieb68e8a63d91a99aa73570e2c76c0b329449fd3b
parent 55c4e431

services/core/java/com/android/server/locksettings/RebootEscrowManager.java

+6 −2
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ import android.content.pm.UserInfo; 
import android.hardware.rebootescrow.IRebootEscrow;

import android.os.RemoteException;

import android.os.ServiceManager;

import android.os.ServiceSpecificException;

import android.os.SystemClock;

import android.os.UserManager;

import android.provider.Settings;
@@ -244,6 +245,9 @@ class RebootEscrowManager { 
        } catch (RemoteException e) {

            Slog.w(TAG, "Could not retrieve escrow data");

            return null;

        } catch (ServiceSpecificException e) {

            Slog.w(TAG, "Got service-specific exception: " + e.errorCode);

            return null;

        }

    }
@@ -335,7 +339,7 @@ class RebootEscrowManager { 


        try {

            rebootEscrow.storeKey(new byte[32]);

        } catch (RemoteException e) {

        } catch (RemoteException | ServiceSpecificException e) {

            Slog.w(TAG, "Could not call RebootEscrow HAL to shred key");

        }
@@ -373,7 +377,7 @@ class RebootEscrowManager { 
            rebootEscrow.storeKey(escrowKey.getKeyBytes());

            armedRebootEscrow = true;

            Slog.i(TAG, "Reboot escrow key stored with RebootEscrow HAL");

        } catch (RemoteException e) {

        } catch (RemoteException | ServiceSpecificException e) {

            Slog.e(TAG, "Failed escrow secret to RebootEscrow HAL", e);

        }

services/tests/servicestests/src/com/android/server/locksettings/RebootEscrowManagerTests.java

+26 −0
Original line number Diff line number Diff line
@@ -43,6 +43,7 @@ import android.content.ContextWrapper; 
import android.content.pm.UserInfo;

import android.hardware.rebootescrow.IRebootEscrow;

import android.os.RemoteException;

import android.os.ServiceSpecificException;

import android.os.UserManager;

import android.platform.test.annotations.Presubmit;
@@ -177,6 +178,13 @@ public class RebootEscrowManagerTests { 
        verify(mRebootEscrow).storeKey(eq(new byte[32]));

    }



    @Test

    public void clearCredentials_HalFailure_NonFatal() throws Exception {

        doThrow(ServiceSpecificException.class).when(mRebootEscrow).storeKey(any());

        mService.clearRebootEscrow();

        verify(mRebootEscrow).storeKey(eq(new byte[32]));

    }



    @Test

    public void armService_Success() throws Exception {

        RebootEscrowListener mockListener = mock(RebootEscrowListener.class);
@@ -199,6 +207,24 @@ public class RebootEscrowManagerTests { 
        assertFalse(mStorage.hasRebootEscrow(NONSECURE_SECONDARY_USER_ID));

    }



    @Test

    public void armService_HalFailure_NonFatal() throws Exception {

        RebootEscrowListener mockListener = mock(RebootEscrowListener.class);

        mService.setRebootEscrowListener(mockListener);

        mService.prepareRebootEscrow();



        clearInvocations(mRebootEscrow);

        mService.callToRebootEscrowIfNeeded(PRIMARY_USER_ID, FAKE_SP_VERSION, FAKE_AUTH_TOKEN);

        verify(mockListener).onPreparedForReboot(eq(true));

        verify(mRebootEscrow, never()).storeKey(any());



        assertNull(

                mStorage.getString(RebootEscrowManager.REBOOT_ESCROW_ARMED_KEY, null, USER_SYSTEM));

        doThrow(ServiceSpecificException.class).when(mRebootEscrow).storeKey(any());

        assertFalse(mService.armRebootEscrowIfNeeded());

        verify(mRebootEscrow).storeKey(any());

    }



    @Test

    public void armService_MultipleUsers_Success() throws Exception {

        RebootEscrowListener mockListener = mock(RebootEscrowListener.class);