Add mechanism for a task's windows to be trusted overlays (SF)

- Add a layer state to indicate that this layer and its children
  in the hierarchy are trusted. This can only be set by callers
  holding ACCESS_SURFACE_FLINGER, and will be used for the PIP
  task layer to indicate that activities in PIP are trusted (as
  they are controlled only by the user and SystemUI)

Bug: 191529039
Bug: 196389741
Test: TBD

Change-Id: Id92ccb087bd0d8dbaeeef3ba50b67fe015e53db8
Merged-In: Id92ccb087bd0d8dbaeeef3ba50b67fe015e53db8

1 files changed, 8 insertions, 0 deletions

diff --git a/libs/gui/LayerState.cpp b/libs/gui/LayerState.cpp
index e43446ac8c..a897d1025f 100644
--- a/libs/gui/LayerState.cpp
+++ b/libs/gui/LayerState.cpp
@@ -117,6 +117,8 @@ status_t layer_state_t::write(Parcel& output) const
     output.writeFloat(frameRate);
     output.writeByte(frameRateCompatibility);
     output.writeUint32(fixedTransformHint);
+    output.writeBool(isTrustedOverlay);
+
     return NO_ERROR;
 }
 
@@ -200,6 +202,8 @@ status_t layer_state_t::read(const Parcel& input)
     frameRate = input.readFloat();
     frameRateCompatibility = input.readByte();
     fixedTransformHint = static_cast<ui::Transform::RotationFlags>(input.readUint32());
+    isTrustedOverlay = input.readBool();
+
     return NO_ERROR;
 }
 
@@ -439,6 +443,10 @@ void layer_state_t::merge(const layer_state_t& other) {
         what |= eFixedTransformHintChanged;
         fixedTransformHint = other.fixedTransformHint;
     }
+    if (other.what & eTrustedOverlayChanged) {
+        what |= eTrustedOverlayChanged;
+        isTrustedOverlay = other.isTrustedOverlay;
+    }
     if ((other.what & what) != other.what) {
         ALOGE("Unmerged SurfaceComposer Transaction properties. LayerState::merge needs updating? "
               "other.what=0x%" PRIu64 " what=0x%" PRIu64,