bdca6c3d1f
Previously, AllocateGlyph would return a new glyph with refcount=0 and a re-used glyph would end up not changing the refcount at all. The resulting glyph_new array would thus have multiple entries pointing to the same non-refcounted glyphs. AddGlyph may free a glyph, resulting in a UAF when the same glyph pointer is then later used. Fix this by returning a refcount of 1 for a new glyph and always incrementing the refcount for a re-used glyph, followed by dropping that refcount back down again when we're done with it. CVE-2024-31083, ZDI-CAN-22880 This vulnerability was discovered by: Jan-Niklas Sohn working with Trend Micro Zero Day Initiative Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1463> |
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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: