[xorg-bugzilla-noise] [Bug 395] New: ELF Loader needs to mark PLT executable

[bugzilla-daemon at pdx.freedesktop.org]

http://pdx.freedesktop.org/cgi-bin/bugzilla/show_bug.cgi?id=395

           Summary: ELF Loader needs to mark PLT executable
           Product: xorg
           Version: CVS_head
          Platform: HP
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Server/general
        AssignedTo: xorg-bugzilla-noise at freedesktop.org
        ReportedBy: jdennis at redhat.com


The ELF loader marks memory being used for executable code as executable via
mprotect. The PLT (Procedure Linkage Table) also contains executable code and
due to an oversight when the elfloader creates the PLT via malloc the memory
used to contain the PLT was not marked exeuctable as is done with other
executable memory regions in the loader. Unless this done any OS which does not
allow by default executable data areas for security reasons will cause the
Xserver to fault.



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