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DO NOT MERGE: WM: Only allow system to use NO_INPUT_CHANNEL.

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NO_INPUT_CHANNEL is a hidden WM flag that allows creation of a window
without an input channel. Unfortunately in releases prior to Android R
this would allow creation of a Window which will not be known to the
InputDispatcher at all. This means that the logic generating
FLAG_OBSCURED will work and a window will be able to overlay another
window without the overlayed window being notified. In Android R and
later this isn't a problem as the InputDispatcher is informed of all
windows, input channel or not. For past Android releases, this patch
disables NO_INPUT_CHANNEL for use outside of the WM.

Bug: 152064592
Test: Existing tests pass
Change-Id: I7e1f45cba139eab92e7df88d1e052baba0ae2cc6
This commit is contained in:
Robert Carr
2020-12-11 12:59:08 -08:00
committed by Rob Carr
parent e8630b7a20
commit d0ad4beb52
3 changed files with 16 additions and 7 deletions
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7
core/java/android/view/InputChannel.java
View File

@@ -110,6 +110,13 @@ public final class InputChannel implements Parcelable {
return name != null ? name : "uninitialized";
}
/**
* @hide
*/
public boolean isValid() {
return mPtr != 0;
}
/**
* Disposes the input channel.
* Explicitly releases the reference this object is holding on the input channel.

7
core/java/android/view/ViewRootImpl.java
View File

@@ -875,10 +875,7 @@ public final class ViewRootImpl implements ViewParent,
// manager, to make sure we do the relayout before receiving
// any other events from the system.
requestLayout();
if ((mWindowAttributes.inputFeatures
& WindowManager.LayoutParams.INPUT_FEATURE_NO_INPUT_CHANNEL) == 0) {
mInputChannel = new InputChannel();
}
mInputChannel = new InputChannel();
mForceDecorViewVisibility = (mWindowAttributes.privateFlags
& PRIVATE_FLAG_FORCE_DECOR_VIEW_VISIBILITY) != 0;
try {
@@ -971,7 +968,7 @@ public final class ViewRootImpl implements ViewParent,
mInputQueueCallback =
((RootViewSurfaceTaker)view).willYouTakeTheInputQueue();
}
if (mInputChannel != null) {
if (mInputChannel.isValid()) {
if (mInputQueueCallback != null) {
mInputQueue = new InputQueue();
mInputQueueCallback.onInputQueueCreated(mInputQueue);

9
services/core/java/com/android/server/wm/WindowManagerService.java
View File

@@ -1462,8 +1462,13 @@ public class WindowManagerService extends IWindowManager.Stub
return res;
}
final boolean openInputChannels = (outInputChannel != null
&& (attrs.inputFeatures & INPUT_FEATURE_NO_INPUT_CHANNEL) == 0);
boolean openInputChannels = (outInputChannel != null
&& (attrs.inputFeatures & INPUT_FEATURE_NO_INPUT_CHANNEL) == 0);
if (callingUid != SYSTEM_UID) {
Slog.e(TAG_WM,
"App trying to use insecure INPUT_FEATURE_NO_INPUT_CHANNEL flag. Ignoring");
openInputChannels = true;
}
if (openInputChannels) {
win.openInputChannel(outInputChannel);
}