Exclude secure layers from most screenshots taken by the system server.
In pre-P versions of Android, it was allowed to screenshot secure layers if the
buffer queue producer which was the target of the screenshot was owned by
the system (in this case SurfaceFlinger). This really was a synonym for:
The screen rotation animation was allowed to capture secure layers, but the other
code paths weren't. In O we mistakenly changed this check to always allow the system server
to capture secure layers via the captureScreen path (the captureLayers path used for
TaskSnapshots was unaffected). This can result in data leakage in cases where the
system server takes screenshots on behalf of other parts of the system (e.g. for
the assistant). To mitigate this we provide an explicit switch for the system server
to specify whether it wishes to capture Secure layers. While this is dangerous, I think
it is less dangerous than the previous implicit switch of capturing secure layers based on which
type of BufferQueue was passed in. The flag defaults to not capturing secure layers
and we set it to true in the one place we need it (for the screen rotation animation).
Non privileged clients can still not capture secure layers at all directly.
Test: TransactionTest.cpp#SetFlagsSecureEUidSystem
Bug: 120610669
Change-Id: I9d32c5ac2b005059be9f464859a415167d9ddbd4
diff --git a/core/java/android/view/SurfaceControl.java b/core/java/android/view/SurfaceControl.java
index aaf85af..ee91c85 100644
--- a/core/java/android/view/SurfaceControl.java
+++ b/core/java/android/view/SurfaceControl.java
@@ -88,7 +88,8 @@
private static native void nativeDisconnect(long nativeObject);
private static native GraphicBuffer nativeScreenshot(IBinder displayToken,
- Rect sourceCrop, int width, int height, boolean useIdentityTransform, int rotation);
+ Rect sourceCrop, int width, int height, boolean useIdentityTransform, int rotation,
+ boolean captureSecureLayers);
private static native GraphicBuffer nativeCaptureLayers(IBinder layerHandleToken,
Rect sourceCrop, float frameScale);
@@ -1853,7 +1854,29 @@
throw new IllegalArgumentException("displayToken must not be null");
}
- return nativeScreenshot(display, sourceCrop, width, height, useIdentityTransform, rotation);
+ return nativeScreenshot(display, sourceCrop, width, height, useIdentityTransform, rotation,
+ false /* captureSecureLayers */);
+ }
+
+ /**
+ * Like screenshotToBuffer, but if the caller is AID_SYSTEM, allows
+ * for the capture of secure layers. This is used for the screen rotation
+ * animation where the system server takes screenshots but does
+ * not persist them or allow them to leave the server. However in other
+ * cases in the system server, we mostly want to omit secure layers
+ * like when we take a screenshot on behalf of the assistant.
+ *
+ * @hide
+ */
+ public static GraphicBuffer screenshotToBufferWithSecureLayersUnsafe(IBinder display,
+ Rect sourceCrop, int width, int height, boolean useIdentityTransform,
+ int rotation) {
+ if (display == null) {
+ throw new IllegalArgumentException("displayToken must not be null");
+ }
+
+ return nativeScreenshot(display, sourceCrop, width, height, useIdentityTransform, rotation,
+ true /* captureSecureLayers */);
}
private static void rotateCropForSF(Rect crop, int rot) {
diff --git a/core/jni/android_view_SurfaceControl.cpp b/core/jni/android_view_SurfaceControl.cpp
index 003ee37..4069e95 100644
--- a/core/jni/android_view_SurfaceControl.cpp
+++ b/core/jni/android_view_SurfaceControl.cpp
@@ -205,7 +205,7 @@
static jobject nativeScreenshot(JNIEnv* env, jclass clazz,
jobject displayTokenObj, jobject sourceCropObj, jint width, jint height,
- bool useIdentityTransform, int rotation) {
+ bool useIdentityTransform, int rotation, bool captureSecureLayers) {
sp<IBinder> displayToken = ibinderForJavaObject(env, displayTokenObj);
if (displayToken == NULL) {
return NULL;
@@ -213,9 +213,9 @@
Rect sourceCrop = rectFromObj(env, sourceCropObj);
sp<GraphicBuffer> buffer;
status_t res = ScreenshotClient::capture(displayToken, ui::Dataspace::V0_SRGB,
- ui::PixelFormat::RGBA_8888,
- sourceCrop, width, height,
- useIdentityTransform, rotation, &buffer);
+ ui::PixelFormat::RGBA_8888,
+ sourceCrop, width, height,
+ useIdentityTransform, rotation, captureSecureLayers, &buffer);
if (res != NO_ERROR) {
return NULL;
}
@@ -1232,7 +1232,7 @@
(void*)nativeSetOverrideScalingMode },
{"nativeGetHandle", "(J)Landroid/os/IBinder;",
(void*)nativeGetHandle },
- {"nativeScreenshot", "(Landroid/os/IBinder;Landroid/graphics/Rect;IIZI)Landroid/graphics/GraphicBuffer;",
+ {"nativeScreenshot", "(Landroid/os/IBinder;Landroid/graphics/Rect;IIZIZ)Landroid/graphics/GraphicBuffer;",
(void*)nativeScreenshot },
{"nativeCaptureLayers", "(Landroid/os/IBinder;Landroid/graphics/Rect;F)Landroid/graphics/GraphicBuffer;",
(void*)nativeCaptureLayers },
diff --git a/services/core/java/com/android/server/display/DisplayManagerService.java b/services/core/java/com/android/server/display/DisplayManagerService.java
index b020997..01d19c0 100644
--- a/services/core/java/com/android/server/display/DisplayManagerService.java
+++ b/services/core/java/com/android/server/display/DisplayManagerService.java
@@ -37,7 +37,9 @@
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.ColorSpace;
+import android.graphics.GraphicBuffer;
import android.graphics.Point;
+import android.graphics.Rect;
import android.hardware.SensorManager;
import android.hardware.display.AmbientBrightnessDayStats;
import android.hardware.display.BrightnessChangeEvent;
@@ -1277,7 +1279,14 @@
if (token == null) {
return false;
}
- SurfaceControl.screenshot(token, outSurface);
+ final GraphicBuffer gb = SurfaceControl.screenshotToBufferWithSecureLayersUnsafe(
+ token, new Rect(), 0 /* width */, 0 /* height */, false /* useIdentityTransform */,
+ 0 /* rotation */);
+ try {
+ outSurface.attachAndQueueBuffer(gb);
+ } catch (RuntimeException e) {
+ Slog.w(TAG, "Failed to take screenshot - " + e.getMessage());
+ }
return true;
}