[Bug 2738] New: XGrabKey allows several grabs on the same key by the same client.

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https://bugs.freedesktop.org/show_bug.cgi?id=2738          
     
           Summary: XGrabKey allows several grabs on the same key by the
                    same client.
           Product: xorg
           Version: 6.8.0
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Server/general
        AssignedTo: xorg-bugzilla-noise at freedesktop.org
        ReportedBy: torso690 at student.liu.se


I think I have traced this to the AddPassiveGrabToList function in
xc/programs/Xserver/dix/grabs.c. This function allows the same client to succeed
with multiple grabs on the same key if the requests are made from the same client.

When using a program that carelessly calls XGrabKey several times, the list of
grabs increases. After a while, this makes the X server use 100% CPU as well as
being unresponsive for several minutes.          
     
     
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