mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
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158 lines
8.1 KiB
Diff
158 lines
8.1 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Matt Pietal <mpietal@google.com>
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Date: Fri, 1 Oct 2021 11:03:16 -0400
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Subject: [PATCH] Keyguard - Treat messsages to lock with priority
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When switching users and attempting to lock the device, the sysui main
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thread becomes overwhelmed with events, creating a significant lag
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between the time a message is posted and processed on the main
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thread. This can be dangerous when these events are critical for
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security, such as calls coming from PhoneWindowManager#lockNow() that
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call KeyguardViewMediator#doKeyguardTimeout(). On older devices with
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slower CPUs and less memory, the delay in processing can be
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significant (15 - 30s).
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The result of not prioritizing these events leads to a window of time
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where a guest user can switch back to the owner, and gain access to
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the owner's homescreen without needing to unlock the device with the
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owner's credentials.
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As a mitigation, prioritize two events originating in two specific
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methods to make sure the device locks as soon as possible as well as
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have the system server preemptively update its local cache.
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Bug: 151095871
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Test: Very manual race condition - follow steps listed in bug
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Change-Id: I7585a0a5eeb308e0e32a4f77f581556d883b5cda
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Merged-In: I7585a0a5eeb308e0e32a4f77f581556d883b5cda
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(cherry picked from commit 28c53ab8bca26af58b45625c1ebba8b9051c107d)
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(cherry picked from commit 563fdf4259d0e28fd960acbb63431e146707d11b)
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Merged-In: I7585a0a5eeb308e0e32a4f77f581556d883b5cda
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---
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.../internal/policy/IKeyguardStateCallback.aidl | 2 +-
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.../systemui/keyguard/KeyguardViewMediator.java | 16 +++++++++++-----
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.../policy/keyguard/KeyguardServiceWrapper.java | 6 ++++++
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.../policy/keyguard/KeyguardStateMonitor.java | 8 +++++---
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4 files changed, 23 insertions(+), 9 deletions(-)
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diff --git a/core/java/com/android/internal/policy/IKeyguardStateCallback.aidl b/core/java/com/android/internal/policy/IKeyguardStateCallback.aidl
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index 8e454db4cb04..a8003a1169e9 100644
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--- a/core/java/com/android/internal/policy/IKeyguardStateCallback.aidl
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+++ b/core/java/com/android/internal/policy/IKeyguardStateCallback.aidl
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@@ -16,7 +16,7 @@
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package com.android.internal.policy;
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interface IKeyguardStateCallback {
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- void onShowingStateChanged(boolean showing);
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+ void onShowingStateChanged(boolean showing, int userId);
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void onSimSecureStateChanged(boolean simSecure);
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void onInputRestrictedStateChanged(boolean inputRestricted);
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void onTrustedChanged(boolean trusted);
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diff --git a/packages/SystemUI/src/com/android/systemui/keyguard/KeyguardViewMediator.java b/packages/SystemUI/src/com/android/systemui/keyguard/KeyguardViewMediator.java
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index 83141f135c90..55db01aca600 100644
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--- a/packages/SystemUI/src/com/android/systemui/keyguard/KeyguardViewMediator.java
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+++ b/packages/SystemUI/src/com/android/systemui/keyguard/KeyguardViewMediator.java
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@@ -1226,7 +1226,9 @@ public class KeyguardViewMediator extends SystemUI {
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public void doKeyguardTimeout(Bundle options) {
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mHandler.removeMessages(KEYGUARD_TIMEOUT);
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Message msg = mHandler.obtainMessage(KEYGUARD_TIMEOUT, options);
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- mHandler.sendMessage(msg);
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+ // Treat these messages with priority - A call to timeout means the device should lock
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+ // as soon as possible and not wait for other messages on the thread to process first.
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+ mHandler.sendMessageAtFrontOfQueue(msg);
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}
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/**
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@@ -1421,12 +1423,15 @@ public class KeyguardViewMediator extends SystemUI {
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* @see #handleShow
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*/
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private void showLocked(Bundle options) {
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- Trace.beginSection("KeyguardViewMediator#showLocked aqcuiring mShowKeyguardWakeLock");
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+ Trace.beginSection("KeyguardViewMediator#showLocked acquiring mShowKeyguardWakeLock");
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if (DEBUG) Log.d(TAG, "showLocked");
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// ensure we stay awake until we are finished displaying the keyguard
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mShowKeyguardWakeLock.acquire();
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Message msg = mHandler.obtainMessage(SHOW, options);
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- mHandler.sendMessage(msg);
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+ // Treat these messages with priority - This call can originate from #doKeyguardTimeout,
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+ // meaning the device should lock as soon as possible and not wait for other messages on
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+ // the thread to process first.
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+ mHandler.sendMessageAtFrontOfQueue(msg);
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Trace.endSection();
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}
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@@ -1579,6 +1584,7 @@ public class KeyguardViewMediator extends SystemUI {
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case KEYGUARD_TIMEOUT:
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synchronized (KeyguardViewMediator.this) {
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doKeyguardLocked((Bundle) msg.obj);
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+ notifyDefaultDisplayCallbacks(mShowing);
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}
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break;
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case DISMISS:
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@@ -2122,7 +2128,7 @@ public class KeyguardViewMediator extends SystemUI {
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for (int i = size - 1; i >= 0; i--) {
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IKeyguardStateCallback callback = mKeyguardStateCallbacks.get(i);
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try {
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- callback.onShowingStateChanged(showing);
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+ callback.onShowingStateChanged(showing, KeyguardUpdateMonitor.getCurrentUser());
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} catch (RemoteException e) {
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Slog.w(TAG, "Failed to call onShowingStateChanged", e);
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if (e instanceof DeadObjectException) {
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@@ -2170,7 +2176,7 @@ public class KeyguardViewMediator extends SystemUI {
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mKeyguardStateCallbacks.add(callback);
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try {
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callback.onSimSecureStateChanged(mUpdateMonitor.isSimPinSecure());
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- callback.onShowingStateChanged(mShowing);
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+ callback.onShowingStateChanged(mShowing, KeyguardUpdateMonitor.getCurrentUser());
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callback.onInputRestrictedStateChanged(mInputRestricted);
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callback.onTrustedChanged(mUpdateMonitor.getUserHasTrust(
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KeyguardUpdateMonitor.getCurrentUser()));
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diff --git a/services/core/java/com/android/server/policy/keyguard/KeyguardServiceWrapper.java b/services/core/java/com/android/server/policy/keyguard/KeyguardServiceWrapper.java
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index 952e0b017041..6bbc20338b02 100644
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--- a/services/core/java/com/android/server/policy/keyguard/KeyguardServiceWrapper.java
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+++ b/services/core/java/com/android/server/policy/keyguard/KeyguardServiceWrapper.java
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@@ -192,6 +192,12 @@ public class KeyguardServiceWrapper implements IKeyguardService {
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@Override // Binder interface
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public void doKeyguardTimeout(Bundle options) {
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+ int userId = mKeyguardStateMonitor.getCurrentUser();
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+ if (mKeyguardStateMonitor.isSecure(userId)) {
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+ // Preemptively inform the cache that the keyguard will soon be showing, as calls to
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+ // doKeyguardTimeout are a signal to lock the device as soon as possible.
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+ mKeyguardStateMonitor.onShowingStateChanged(true, userId);
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+ }
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try {
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mService.doKeyguardTimeout(options);
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} catch (RemoteException e) {
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diff --git a/services/core/java/com/android/server/policy/keyguard/KeyguardStateMonitor.java b/services/core/java/com/android/server/policy/keyguard/KeyguardStateMonitor.java
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index fd34c510d98d..d454f26a4317 100644
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--- a/services/core/java/com/android/server/policy/keyguard/KeyguardStateMonitor.java
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+++ b/services/core/java/com/android/server/policy/keyguard/KeyguardStateMonitor.java
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@@ -84,7 +84,9 @@ public class KeyguardStateMonitor extends IKeyguardStateCallback.Stub {
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}
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@Override // Binder interface
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- public void onShowingStateChanged(boolean showing) {
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+ public void onShowingStateChanged(boolean showing, int userId) {
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+ if (userId != mCurrentUserId) return;
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+
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mIsShowing = showing;
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mCallback.onShowingChanged();
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@@ -99,7 +101,7 @@ public class KeyguardStateMonitor extends IKeyguardStateCallback.Stub {
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mCurrentUserId = userId;
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}
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- private synchronized int getCurrentUser() {
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+ public synchronized int getCurrentUser() {
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return mCurrentUserId;
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}
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@@ -133,4 +135,4 @@ public class KeyguardStateMonitor extends IKeyguardStateCallback.Stub {
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pw.println(prefix + "mTrusted=" + mTrusted);
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pw.println(prefix + "mCurrentUserId=" + mCurrentUserId);
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}
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-}
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\ No newline at end of file
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+}
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