[Bug dynamic-link/20488] New: dl_build_local_scope processes in depth first not breadth first

["mark.hatle at windriver dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20488

            Bug ID: 20488
           Summary: dl_build_local_scope processes in depth first not
                    breadth first
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: mark.hatle at windriver dot com
  Target Milestone: ---

The ELF specification indicates symbol resolution should be breadth first, not
depth first.

The dl-deps.c: dl_build_locale_scope function is processing in a depth first
mode.  This is causes certain symbols to be incorrectly reported when
LD_TRACE_PRELINKING=1 is enabled.

In the 'cross' prelink emulated RTLD, we had a similar bug and fixed the issue.

glibc has the same problem.

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