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Only allow trusted overlays to specify FLAG_SLIPPERY

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Test: atest FlagSlipperyTest
Bug: 157929241
Change-Id: Ia30f1c38d5ddb351c90b748ea76448a76a9dde7b
Merged-In: Ia30f1c38d5ddb351c90b748ea76448a76a9dde7b
This commit is contained in:
Siarhei Vishniakou
2021-07-20 16:17:58 -07:00
parent 715cce9b75
commit 0657e19940
2 changed files with 21 additions and 1 deletions
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17
services/core/java/com/android/server/wm/DisplayPolicy.java
View File

@@ -56,6 +56,7 @@ import static android.view.WindowManager.LayoutParams.FLAG_LAYOUT_INSET_DECOR;
import static android.view.WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;
import static android.view.WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS;
import static android.view.WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE;
import static android.view.WindowManager.LayoutParams.FLAG_SLIPPERY;
import static android.view.WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_ALWAYS;
import static android.view.WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_DEFAULT;
import static android.view.WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_SHORT_EDGES;
@@ -845,6 +846,20 @@ public class DisplayPolicy {
== PackageManager.PERMISSION_GRANTED;
}
/**
* Only trusted overlays are allowed to use FLAG_SLIPPERY.
*/
static int sanitizeFlagSlippery(int flags, int privateFlags, String name) {
if ((flags & FLAG_SLIPPERY) == 0) {
return flags;
}
if ((privateFlags & PRIVATE_FLAG_TRUSTED_OVERLAY) != 0) {
return flags;
}
Slog.w(TAG, "Removing FLAG_SLIPPERY for non-trusted overlay " + name);
return flags & ~FLAG_SLIPPERY;
}
/**
* Sanitize the layout parameters coming from a client. Allows the policy
* to do things like ensure that windows of a specific type can't take
@@ -925,6 +940,8 @@ public class DisplayPolicy {
if (mExtraNavBarAlt == win) {
mExtraNavBarAltPosition = getAltBarPosition(attrs);
}
attrs.flags = sanitizeFlagSlippery(attrs.flags, attrs.privateFlags, win.getName());
}
/**

5
services/core/java/com/android/server/wm/WindowManagerService.java
View File

@@ -56,6 +56,7 @@ import static android.view.WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
import static android.view.WindowManager.LayoutParams.FLAG_SECURE;
import static android.view.WindowManager.LayoutParams.FLAG_SHOW_WALLPAPER;
import static android.view.WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED;
import static android.view.WindowManager.LayoutParams.FLAG_SLIPPERY;
import static android.view.WindowManager.LayoutParams.INPUT_FEATURE_NO_INPUT_CHANNEL;
import static android.view.WindowManager.LayoutParams.INVALID_WINDOW_TYPE;
import static android.view.WindowManager.LayoutParams.LAST_APPLICATION_WINDOW;
@@ -8215,8 +8216,10 @@ public class WindowManagerService extends IWindowManager.Stub
h.token = channelToken;
h.name = name;
flags = DisplayPolicy.sanitizeFlagSlippery(flags, privateFlags, name);
final int sanitizedFlags = flags & (LayoutParams.FLAG_NOT_TOUCHABLE
| LayoutParams.FLAG_SLIPPERY | LayoutParams.FLAG_NOT_FOCUSABLE);
| FLAG_SLIPPERY | LayoutParams.FLAG_NOT_FOCUSABLE);
h.layoutParamsFlags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | sanitizedFlags;
h.layoutParamsType = type;
h.dispatchingTimeoutMillis = DEFAULT_DISPATCHING_TIMEOUT_MILLIS;