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If a server sends an incorrect length in its response, a client is prone to perform an out of boundary read while processing the data. The length field of xHostEntry is used to specify the amount of bytes used to represent the address. It is 16 bit, which means that it is not possible to perform an arbitrary memory access, but it might be enough to read sensitive information, e.g. malloc-related pointers and offsets. Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org> Reviewed-by: Matthieu Herrb <matthieu@herrb.eu> |
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libX11 - Core X11 protocol client library
Documentation for this library can be found in the included man pages,
and in the Xlib spec from the specs subdirectory, also available at:
http://www.x.org/releases/current/doc/libX11/libX11/libX11.html
http://www.x.org/releases/current/doc/libX11/libX11/libX11.pdf
and the O'Reilly Xlib books, which they have made freely available online,
though only for older versions of X11:
- X Series Volume 2: Xlib Reference Manual (1989, covers X11R3)
http://www.archive.org/details/xlibretmanver1102nyemiss
- X Series Volume 2: Xlib Reference Manual, 2nd Edition (1990, covers X11R4)
http://www.archive.org/details/xlibrefmanv115ed02nyemiss
All questions regarding this software should be directed at the
Xorg mailing list:
http://lists.freedesktop.org/mailman/listinfo/xorg
Please submit bug reports to the Xorg bugzilla:
https://bugs.freedesktop.org/enter_bug.cgi?product=xorg
The master development code repository can be found at:
git://anongit.freedesktop.org/git/xorg/lib/libX11
http://cgit.freedesktop.org/xorg/lib/libX11
For patch submission instructions, see:
http://www.x.org/wiki/Development/Documentation/SubmittingPatches
For more information on the git code manager, see:
http://wiki.x.org/wiki/GitPage