Tracks whether an injected MotionEvent came from an accessibility tool.

This property can be checked by the View to allow sensitive views
to ignore gestures injected by non-tool accessibility services.
Sensitive views should continue responding to gestures injected
by Accessibility Tools.

Note: The files in this change do not reference the new flag, but this
change is a no-op if the flag is not enabled. See other change in this
topic.

Bug: 284180538
Flag: android.view.accessibility.prevent_a11y_nontool_from_injecting_into_sensitive_views
Test: atest InputDispatcher_test.cpp
Test: See other change in topic for tests using this property
Change-Id: I40ba79852045aaefe84f7ab87d5e08c42509f1e7

Author: Daniel-Norman

include/input/Input.h

@@ -92,11 +92,23 @@ enum {
             static_cast<int32_t>(android::os::MotionEventFlag::NO_FOCUS_CHANGE),
 
     /**
-     * This event was generated or modified by accessibility service.
+     * This event was injected from some AccessibilityService, which may be either an
+     * Accessibility Tool OR a service using that API for purposes other than assisting users
+     * with disabilities.
      */
     AMOTION_EVENT_FLAG_IS_ACCESSIBILITY_EVENT =
             static_cast<int32_t>(android::os::MotionEventFlag::IS_ACCESSIBILITY_EVENT),
 
+    /**
+     * This event was injected from an AccessibilityService with the
+     * AccessibilityServiceInfo#isAccessibilityTool property set to true. These services (known as
+     * "Accessibility Tools") are used to assist users with disabilities, so events from these
+     * services should be able to reach all Views including Views which set
+     * View#isAccessibilityDataSensitive to true.
+     */
+    AMOTION_EVENT_FLAG_INJECTED_FROM_ACCESSIBILITY_TOOL =
+            static_cast<int32_t>(android::os::MotionEventFlag::INJECTED_FROM_ACCESSIBILITY_TOOL),
+
     AMOTION_EVENT_FLAG_TARGET_ACCESSIBILITY_FOCUS =
             static_cast<int32_t>(android::os::MotionEventFlag::TARGET_ACCESSIBILITY_FOCUS),
 
@@ -347,6 +359,9 @@ enum {
     POLICY_FLAG_INJECTED_FROM_ACCESSIBILITY =
             android::os::IInputConstants::POLICY_FLAG_INJECTED_FROM_ACCESSIBILITY,
 
+    POLICY_FLAG_INJECTED_FROM_ACCESSIBILITY_TOOL =
+            android::os::IInputConstants::POLICY_FLAG_INJECTED_FROM_ACCESSIBILITY_TOOL,
+
     /* These flags are set by the input dispatcher. */
 
     // Indicates that the input event was injected.

libs/input/android/os/IInputConstants.aidl

@@ -43,8 +43,9 @@ interface IInputConstants
     const int INVALID_INPUT_DEVICE_ID = -2;
 
     /**
-     * The input event was injected from accessibility. Used in policyFlags for input event
-     * injection.
+     * The input event was injected from some AccessibilityService, which may be either an
+     * Accessibility Tool OR a service using that API for purposes other than assisting users with
+     * disabilities. Used in policyFlags for input event injection.
      */
     const int POLICY_FLAG_INJECTED_FROM_ACCESSIBILITY = 0x20000;
 
@@ -54,18 +55,33 @@ interface IInputConstants
      */
     const int POLICY_FLAG_KEY_GESTURE_TRIGGERED = 0x40000;
 
+    /**
+     * The input event was injected from an AccessibilityService with the
+     * AccessibilityServiceInfo#isAccessibilityTool property set to true. These services (known as
+     * "Accessibility Tools") are used to assist users with disabilities, so events from these
+     * services should be able to reach all Views including Views which set
+     * View#isAccessibilityDataSensitive to true. Used in policyFlags for input event injection.
+     */
+    const int POLICY_FLAG_INJECTED_FROM_ACCESSIBILITY_TOOL = 0x80000;
+
     /**
      * Common input event flag used for both motion and key events for a gesture or pointer being
      * canceled.
      */
     const int INPUT_EVENT_FLAG_CANCELED = 0x20;
 
     /**
-     * Common input event flag used for both motion and key events, indicating that the event
-     * was generated or modified by accessibility service.
+     * Input event flag used for both motion and key events.
+     * See POLICY_FLAG_INJECTED_FROM_ACCESSIBILITY for more information.
      */
     const int INPUT_EVENT_FLAG_IS_ACCESSIBILITY_EVENT = 0x800;
 
+    /**
+     * Input event flag used for motion events.
+     * See POLICY_FLAG_INJECTED_FROM_ACCESSIBILITY_TOOL for more information.
+     */
+    const int INPUT_EVENT_FLAG_INJECTED_FROM_ACCESSIBILITY_TOOL = 0x1000;
+
     /**
      * Common input event flag used for both motion and key events, indicating that the system has
      * detected this event may be inconsistent with the current event sequence or gesture, such as

libs/input/android/os/MotionEventFlag.aidl

@@ -118,12 +118,23 @@ enum MotionEventFlag {
     PRIVATE_FLAG_SUPPORTS_DIRECTIONAL_ORIENTATION = 0x100,
 
     /**
-     * The input event was generated or modified by accessibility service.
-     * Shared by both KeyEvent and MotionEvent flags, so this value should not overlap with either
-     * set of flags, including in input/Input.h and in android/input.h.
+     * The input event was injected from some AccessibilityService, which may be either an
+     * Accessibility Tool OR a service using that API for purposes other than assisting users with
+     * disabilities. Shared by both KeyEvent and MotionEvent flags, so this value should not
+     * overlap with either set of flags, including in input/Input.h and in android/input.h.
      */
     IS_ACCESSIBILITY_EVENT = IInputConstants.INPUT_EVENT_FLAG_IS_ACCESSIBILITY_EVENT,
 
+    /**
+     * The input event was injected from an AccessibilityService with the
+     * AccessibilityServiceInfo#isAccessibilityTool property set to true. These services (known as
+     * "Accessibility Tools") are used to assist users with disabilities, so events from these
+     * services should be able to reach all Views including Views which set
+     * View#isAccessibilityDataSensitive to true. Only used by MotionEvent flags.
+     */
+    INJECTED_FROM_ACCESSIBILITY_TOOL =
+        IInputConstants.INPUT_EVENT_FLAG_INJECTED_FROM_ACCESSIBILITY_TOOL,
+
     /**
      * Private flag that indicates when the system has detected that this motion event
      * may be inconsistent with respect to the sequence of previously delivered motion events,

libs/input/rust/input.rs

@@ -219,6 +219,9 @@ bitflags! {
                 MotionEventFlag::PRIVATE_FLAG_SUPPORTS_DIRECTIONAL_ORIENTATION.0 as u32;
         /// FLAG_IS_ACCESSIBILITY_EVENT
         const IS_ACCESSIBILITY_EVENT = MotionEventFlag::IS_ACCESSIBILITY_EVENT.0 as u32;
+        /// FLAG_INJECTED_FROM_ACCESSIBILITY_TOOL
+        const INJECTED_FROM_ACCESSIBILITY_TOOL =
+                MotionEventFlag::INJECTED_FROM_ACCESSIBILITY_TOOL.0 as u32;
         /// FLAG_TAINTED
         const TAINTED = MotionEventFlag::TAINTED.0 as u32;
         /// FLAG_TARGET_ACCESSIBILITY_FOCUS

services/inputflinger/dispatcher/InputDispatcher.cpp

@@ -4870,6 +4870,10 @@ InputEventInjectionResult InputDispatcher::injectInputEvent(const InputEvent* ev
                 flags |= AMOTION_EVENT_FLAG_IS_ACCESSIBILITY_EVENT;
             }
 
+            if (policyFlags & POLICY_FLAG_INJECTED_FROM_ACCESSIBILITY_TOOL) {
+                flags |= AMOTION_EVENT_FLAG_INJECTED_FROM_ACCESSIBILITY_TOOL;
+            }
+
             mLock.lock();
 
             if (shouldRejectInjectedMotionLocked(motionEvent, resolvedDeviceId, displayId,

services/inputflinger/tests/InputDispatcher_test.cpp

@@ -9890,6 +9890,15 @@ TEST_F(InputFilterInjectionPolicyTest,
                        AMOTION_EVENT_FLAG_IS_ACCESSIBILITY_EVENT);
 }
 
+TEST_F(InputFilterInjectionPolicyTest,
+       MotionEventsInjectedFromAccessibilityTool_HaveAccessibilityFlags) {
+    testInjectedMotion(POLICY_FLAG_FILTERED | POLICY_FLAG_INJECTED_FROM_ACCESSIBILITY |
+                               POLICY_FLAG_INJECTED_FROM_ACCESSIBILITY_TOOL,
+                       /*injectedDeviceId=*/3, /*resolvedDeviceId=*/3,
+                       AMOTION_EVENT_FLAG_IS_ACCESSIBILITY_EVENT |
+                               AMOTION_EVENT_FLAG_INJECTED_FROM_ACCESSIBILITY_TOOL);
+}
+
 TEST_F(InputFilterInjectionPolicyTest, RegularInjectedEvents_ReceiveVirtualDeviceId) {
     testInjectedKey(/*policyFlags=*/0, /*injectedDeviceId=*/3,
                     /*resolvedDeviceId=*/VIRTUAL_KEYBOARD_ID, /*flags=*/0);