Kernel+Userland: Provide bytes count for a DisplayConnector framebuffer

This value will be used later on by WindowServer to reject resolutions
that will request a mapping that will overflow the hardware framebuffer
max length.

1 files changed, 2 insertions, 0 deletions

diff --git a/Kernel/Graphics/DisplayConnector.cpp b/Kernel/Graphics/DisplayConnector.cpp
index e1bcc9de4d..1686c68545 100644
--- a/Kernel/Graphics/DisplayConnector.cpp
+++ b/Kernel/Graphics/DisplayConnector.cpp
@@ -301,12 +301,14 @@ ErrorOr<void> DisplayConnector::ioctl(OpenFileDescription&, unsigned request, Us
         return {};
     }
     case GRAPHICS_IOCTL_GET_PROPERTIES: {
+        VERIFY(m_shared_framebuffer_vmobject);
         auto user_properties = static_ptr_cast<GraphicsConnectorProperties*>(arg);
         GraphicsConnectorProperties properties {};
         properties.flushing_support = flush_support();
         properties.doublebuffer_support = double_framebuffering_capable();
         properties.partial_flushing_support = partial_flush_support();
         properties.refresh_rate_support = refresh_rate_support();
+        properties.max_buffer_bytes = m_shared_framebuffer_vmobject->size();
 
         return copy_to_user(user_properties, &properties);
     }