[Bug libc/12561] New: ld.so: dlclose() can remove required local scope elements of NODELETE linkmaps

["pasky at suse dot cz" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=12561

           Summary: ld.so: dlclose() can remove required local scope
                    elements of NODELETE linkmaps
           Product: glibc
           Version: 2.13
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper.fsp@gmail.com
        ReportedBy: pasky@suse.cz


Created attachment 5283
  --> http://sourceware.org/bugzilla/attachment.cgi?id=5283
proposed patch, incl. testcase

In case a library is opened with RTLD_LOCAL, dlclose()ing that library
will remove the local scope from all subsequently loaded libraries
unconditionally, even though such a library is marked as RTLD_NODELETE.
This causes subsequent lookups within that library to fail if the
library depends on other libraries than those already loaded within
the global scope.

This has been exposed in a real-world case where libproxy opens
a KDE4 plugin with RTLD_LOCAL, the plugin depends on libkde4_core
and libkde4_core is marked as NODELETE due to having a STB_GNU_UNIQ
symbol; the plugin is dlclose()d later but ld.so raises a fatal
error when libkde4_core global destructor is called (it depends
on libqt4, but libqt4 has been in the plugin's local scope only
and is gone now).

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