[Bug 3433] New: FDPIC Crash / ELF_RTYPE_CLASS_DLSYM missing in dlsym()

bugzilla at busybox.net bugzilla at busybox.net
Mon Mar 7 22:11:51 UTC 2011


https://bugs.busybox.net/show_bug.cgi?id=3433

           Summary: FDPIC Crash / ELF_RTYPE_CLASS_DLSYM missing in dlsym()
           Product: uClibc
           Version: 0.9.32.1
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P5
         Component: Shared Library Support
        AssignedTo: unassigned at uclibc.org
        ReportedBy: mbm at openwrt.org
                CC: uclibc-cvs at uclibc.org
   Estimated Hours: 0.0


Created attachment 3121
  --> https://bugs.busybox.net/attachment.cgi?id=3121
patch to add ELF_RTYPE_CLASS_DLSYM

On FDPIC platforms, functions are passed by function descriptor, not by
pointers. If you don't specify ELF_RTYPE_CLASS_DLSYM when calling
_dl_find_hash() the return value from dlsym() will be a pointer not a function
descriptor, crashing the program.

The bug was introduced when TLS support was added in
534661b91c98492995274c364c8177c45efc63db

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