dd8caf39e9
XKB often uses a FooCheck and Foo function pair, the former is supposed to check all values in the request and error out on BadLength, BadValue, etc. The latter is then called once we're confident the values are good (they may still fail on an individual device, but that's a different topic). In the case of XkbSetDeviceInfo, those functions were incorrectly named, with XkbSetDeviceInfo ending up as the checker function and XkbSetDeviceInfoCheck as the setter function. As a result, the setter function was called before the checker function, accessing request data and modifying device state before we ensured that the data is valid. In particular, the setter function relied on values being already byte-swapped. This in turn could lead to potential OOB memory access. Fix this by correctly naming the functions and moving the length checks over to the checker function. These were added in87c64fc5b0to the wrong function, probably due to the incorrect naming. Fixes ZDI-CAN 16070, CVE-2022-2320. This vulnerability was discovered by: Jan-Niklas Sohn working with Trend Micro Zero Day Initiative Introduced inc06e27b2f6Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
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
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https://lists.freedesktop.org/mailman/listinfo/xorg
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https://gitlab.freedesktop.org/xorg/xserver
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