Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: feef6b15dd31a63cee29678a4d836472ba075a4b
      
https://github.com/WebKit/WebKit/commit/feef6b15dd31a63cee29678a4d836472ba075a4b
  Author: Yulun Wu <[email protected]>
  Date:   2026-09-02 (Wed, 02 Sep 2026)

  Changed paths:
    A LayoutTests/ipc/getpixelbuffer-layerbacking-heap-disclosure-expected.txt
    A LayoutTests/ipc/getpixelbuffer-layerbacking-heap-disclosure.html
    M Source/WebKit/GPUProcess/graphics/RemoteImageBuffer.cpp
    M 
Source/WebKit/WebProcess/GPU/graphics/cocoa/ImageBufferShareableMappedIOSurfaceBitmapBackend.cpp

  Log Message:
  -----------
  putPixelBuffer() and getPixelBuffer() are not applicable for LayerBacking()
https://bugs.webkit.org/show_bug.cgi?id=318455
rdar://177958824

Reviewed by Said Abou-Hallawa.

Per 264004@main, putPixelBuffer() and getPixelBuffer() are not applicable
for LayerBacking. This PR enforces that comment by adding a MESSAGE_CHECK().

This PR also updates the no-op override to zero-fill its
destination instead of leaving it uninitialized to fail gracefully
on release builds while still hitting the assert in debug.

* LayoutTests/ipc/getpixelbuffer-layerbacking-heap-disclosure-expected.txt: 
Added.
* LayoutTests/ipc/getpixelbuffer-layerbacking-heap-disclosure.html: Added.
* Source/WebKit/GPUProcess/graphics/RemoteImageBuffer.cpp:
(WebKit::RemoteImageBuffer::getPixelBuffer):
(WebKit::RemoteImageBuffer::putPixelBuffer):
* 
Source/WebKit/WebProcess/GPU/graphics/cocoa/ImageBufferShareableMappedIOSurfaceBitmapBackend.cpp:
(WebKit::ImageBufferShareableMappedIOSurfaceBitmapBackend::getPixelBuffer):

Originally-landed-as: [email protected] (47dab0040d33). 
rdar://185367113
Canonical link: https://commits.webkit.org/320358@main



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