Merge "Limit number of window context without any window" into rvc-dev am:... (6237d88b) · Commits · e / os / android_frameworks_base

core/java/android/app/WindowContext.java

+6 −0

Original line number	Diff line number	Diff line
		@@ -16,6 +16,7 @@
		package android.app;

		import static android.view.WindowManagerGlobal.ADD_OKAY;
		import static android.view.WindowManagerGlobal.ADD_TOO_MANY_TOKENS;

		import android.annotation.NonNull;
		import android.annotation.Nullable;
		@@ -81,6 +82,11 @@ public class WindowContext extends ContextWrapper {
		mOwnsToken = false;
		throw e.rethrowFromSystemServer();
		}
		if (result == ADD_TOO_MANY_TOKENS) {
		throw new UnsupportedOperationException("createWindowContext failed! Too many unused "
		+ "window contexts. Please see Context#createWindowContext documentation for "
		+ "detail.");
		}
		mOwnsToken = result == ADD_OKAY;
		Reference.reachabilityFence(this);
		}

core/java/android/content/Context.java

+9 −1

Original line number	Diff line number	Diff line
		@@ -5812,6 +5812,12 @@ public abstract class Context {
		* display.</b> If there is a need to add different window types, or non-associated windows,
		* separate Contexts should be used.
		* </p>
		* <p>
		* Creating a window context is an expensive operation. Misuse of this API may lead to a huge
		* performance drop. The best practice is to use the same window context when possible.
		* An approach is to create one window context with specific window type and display and
		* use it everywhere it's needed..
		* </p>
		*
		* @param type Window type in {@link WindowManager.LayoutParams}
		* @param options Bundle used to pass window-related options.
		@@ -5824,7 +5830,9 @@ public abstract class Context {
		* @see #WINDOW_SERVICE
		* @see #LAYOUT_INFLATER_SERVICE
		* @see #WALLPAPER_SERVICE
		* @throws IllegalArgumentException if token is invalid
		* @throws UnsupportedOperationException if this {@link Context} does not attach to a display or
		* the current number of window contexts without adding any view by
		* {@link WindowManager#addView} <b>exceeds five</b>.
		*/
		public @NonNull Context createWindowContext(@WindowType int type, @Nullable Bundle options) {
		throw new RuntimeException("Not implemented. Must override in a subclass.");

core/java/android/view/WindowManagerGlobal.java

+1 −0

Original line number	Diff line number	Diff line
		@@ -145,6 +145,7 @@ public final class WindowManagerGlobal {
		public static final int ADD_INVALID_DISPLAY = -9;
		public static final int ADD_INVALID_TYPE = -10;
		public static final int ADD_INVALID_USER = -11;
		public static final int ADD_TOO_MANY_TOKENS = -12;

		@UnsupportedAppUsage
		private static WindowManagerGlobal sDefaultWindowManager;

services/core/java/com/android/server/wm/DisplayContent.java

+30 −0

Original line number	Diff line number	Diff line
		@@ -5534,4 +5534,34 @@ class DisplayContent extends WindowContainer<DisplayContent.DisplayChildWindowCo
		}
		}
		}

		/**
		* Returns the number of window tokens without surface on this display. A {@link WindowToken}
		* won't have its {@link SurfaceControl} until a window is added to a {@link WindowToken}.
		* The purpose of this method is to accumulate non-window containing {@link WindowToken}s and
		* limit the usage if the count exceeds a number.
		*
		* @param callingUid app calling uid
		* @return the number of window tokens without surface on this display
		* @see WindowToken#addWindow(WindowState)
		*/
		int getWindowTokensWithoutSurfaceCount(int callingUid) {
		List<WindowToken> tokens = new ArrayList<>(mTokenMap.values());
		int count = 0;
		for (int i = tokens.size() - 1; i >= 0; i--) {
		final WindowToken token = tokens.get(i);
		if (callingUid != token.getOwnerUid()) {
		continue;
		}
		// Skip if token is an Activity
		if (token.asActivityRecord() != null) {
		continue;
		}
		if (token.mSurfaceControl != null) {
		continue;
		}
		count++;
		}
		return count;
		}
		}

services/core/java/com/android/server/wm/WindowManagerService.java

+28 −0

Original line number	Diff line number	Diff line
		@@ -23,6 +23,7 @@ import static android.Manifest.permission.MANAGE_APP_TOKENS;
		import static android.Manifest.permission.READ_FRAME_BUFFER;
		import static android.Manifest.permission.REGISTER_WINDOW_MANAGER_LISTENERS;
		import static android.Manifest.permission.RESTRICTED_VR_ACCESS;
		import static android.Manifest.permission.STATUS_BAR_SERVICE;
		import static android.Manifest.permission.WRITE_SECURE_SETTINGS;
		import static android.app.ActivityManagerInternal.ALLOW_FULL_ONLY;
		import static android.app.ActivityManagerInternal.ALLOW_NON_FULL;
		@@ -74,6 +75,7 @@ import static android.view.WindowManager.LayoutParams.TYPE_VOICE_INTERACTION;
		import static android.view.WindowManager.LayoutParams.TYPE_WALLPAPER;
		import static android.view.WindowManager.REMOVE_CONTENT_MODE_UNDEFINED;
		import static android.view.WindowManagerGlobal.ADD_OKAY;
		import static android.view.WindowManagerGlobal.ADD_TOO_MANY_TOKENS;
		import static android.view.WindowManagerGlobal.RELAYOUT_DEFER_SURFACE_DESTROY;
		import static android.view.WindowManagerGlobal.RELAYOUT_RES_BLAST_SYNC;
		import static android.view.WindowManagerGlobal.RELAYOUT_RES_SURFACE_CHANGED;
		@@ -413,6 +415,12 @@ public class WindowManagerService extends IWindowManager.Stub

		private static final int ANIMATION_COMPLETED_TIMEOUT_MS = 5000;

		/** The maximum count of window tokens without surface that an app can register. */
		private static final int MAXIMUM_WINDOW_TOKEN_COUNT_WITHOUT_SURFACE = 5;

		/** System UI can create more window context... */
		private static final int SYSTEM_UI_MULTIPLIER = 2;

		// TODO(b/143053092): Remove the settings if it becomes stable.
		private static final String FIXED_ROTATION_TRANSFORM_SETTING_NAME = "fixed_rotation_transform";
		boolean mIsFixedRotationTransformEnabled;
		@@ -2594,10 +2602,30 @@ public class WindowManagerService extends IWindowManager.Stub
		@Override
		public int addWindowTokenWithOptions(IBinder binder, int type, int displayId, Bundle options,
		String packageName) {
		if (tokenCountExceed()) {
		return ADD_TOO_MANY_TOKENS;
		}
		return addWindowTokenWithOptions(binder, type, displayId, options, packageName,
		true /* fromClientToken */);
		}

		private boolean tokenCountExceed() {
		final int callingUid = Binder.getCallingUid();
		// Don't check if caller is from system server.
		if (callingUid == myPid()) {
		return false;
		}
		final int limit =
		(checkCallingPermission(STATUS_BAR_SERVICE, "addWindowTokenWithOptions"))
		? MAXIMUM_WINDOW_TOKEN_COUNT_WITHOUT_SURFACE * SYSTEM_UI_MULTIPLIER
		: MAXIMUM_WINDOW_TOKEN_COUNT_WITHOUT_SURFACE;
		synchronized (mGlobalLock) {
		int[] count = new int[1];
		mRoot.forAllDisplays(d -> count[0] += d.getWindowTokensWithoutSurfaceCount(callingUid));
		return count[0] >= limit;
		}
		}

		private int addWindowTokenWithOptions(IBinder binder, int type, int displayId, Bundle options,
		String packageName, boolean fromClientToken) {
		final boolean callerCanManageAppTokens =