d9e5f941d3
Add SYNC extension protocol builders (proto/sync.py) and a regression test that reproduces the miSyncDestroyFence and FreeCounter use-after-free. The first test creates a fence and issues AwaitFence with the same fence ID listed twice, creating two trigger list nodes pointing into one SyncAwaitUnion. A second client then destroys the fence. Without the fix, miSyncDestroyFence would invoke CounterDestroyed before saving the next pointer, and the first callback would free the SyncAwaitUnion while the second trigger list node still referenced it. The second test creates a counter (value=0) and issues SyncAwait with two conditions on the same counter, both waiting for value >= 1. Since the counter is 0, Client A blocks. A second client then destroys the counter. Without the fix, FreeCounter would invoke CounterDestroyed before saving the next pointer in the trigger list, and the first callback would free the SyncAwaitUnion while the second trigger node still referenced it. ZDI-CAN-30163 (FreeCounter) ZDI-CAN-30159 (miSyncDestroyFence) Assisted-by: Claude:claude-opus-4-6 Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/2228> |
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X Server
The X server accepts requests from client applications to create windows, which are (normally rectangular) "virtual screens" that the client program can draw into.
Windows are then composed on the actual screen by the X server (or by a separate composite manager) as directed by the window manager, which usually communicates with the user via graphical controls such as buttons and draggable titlebars and borders.
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