reset lockout deadline on device reboot

Gatekeeper retains lockouts after reboot, but framework
doesn't. This causes odd behavior on a reboot after a lockout
as gatekeeper refuses to check the password and the framework
thinks it's an invalid attempt. Reset the lockout deadline
if we notice the clock reset in the framework.

Bug: 23681267

Change-Id: I3127ccd8f205494af5a8ed2b44d4370c37cc2f8f

1 files changed, 12 insertions, 2 deletions

diff --git a/core/java/com/android/internal/widget/LockPatternUtils.java b/core/java/com/android/internal/widget/LockPatternUtils.java
index 86d11be78b0a..61ba4edd6650 100644
--- a/core/java/com/android/internal/widget/LockPatternUtils.java
+++ b/core/java/com/android/internal/widget/LockPatternUtils.java
@@ -1067,12 +1067,22 @@ public class LockPatternUtils {
      *   enter a pattern.
      */
     public long getLockoutAttemptDeadline(int userId) {
-        final long deadline = getLong(LOCKOUT_ATTEMPT_DEADLINE, 0L, userId);
+        long deadline = getLong(LOCKOUT_ATTEMPT_DEADLINE, 0L, userId);
         final long timeoutMs = getLong(LOCKOUT_ATTEMPT_TIMEOUT_MS, 0L, userId);
         final long now = SystemClock.elapsedRealtime();
-        if (deadline < now || deadline > (now + timeoutMs)) {
+        if (deadline < now) {
+            // timeout expired
+            setLong(LOCKOUT_ATTEMPT_DEADLINE, 0, userId);
+            setLong(LOCKOUT_ATTEMPT_TIMEOUT_MS, 0, userId);
             return 0L;
         }
+
+        if (deadline > (now + timeoutMs)) {
+            // device was rebooted, set new deadline
+            deadline = now + timeoutMs;
+            setLong(LOCKOUT_ATTEMPT_DEADLINE, deadline, userId);
+        }
+
         return deadline;
     }