6671daeada
Add a regression test that reproduces the mapWidths stack buffer overflow in CheckKeyTypes. The test sends two XkbSetMap requests: first with firstType=0, nTypes=255, ResizeTypes to expand the type table to 255 entries, then with firstType=255, nTypes=10, ResizeTypes. The second request passes the firstType > num_types check (255 > 255 is false) and computes nMaps = 255 + 10 = 265. Without the fix, the loop would write mapWidths[255..264], overflowing 9 bytes past the 256-element stack buffer into adjacent stack variables. 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.
For a comprehensive overview of X Server and X Window System, consult the following article: https://en.wikipedia.org/wiki/X_server
All questions regarding this software should be directed at the Xorg mailing list:
https://lists.freedesktop.org/mailman/listinfo/xorg
The primary development code repository can be found at:
https://gitlab.freedesktop.org/xorg/xserver
For patch submission instructions, see:
https://www.x.org/wiki/Development/Documentation/SubmittingPatches
As with other projects hosted on freedesktop.org, X.Org follows its Code of Conduct, based on the Contributor Covenant. Please conduct yourself in a respectful and civilized manner when using the above mailing lists, bug trackers, etc: