[Bug ld/27428] Error .eh_frame_hdr refers to overlapping FDEs

[amodra at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27428

Alan Modra <amodra at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|---                         |INVALID

--- Comment #3 from Alan Modra <amodra at gmail dot com> ---
Your system 2.18 binutils is so old that it doesn't check for overlapping FDEs.
The check was added with the following commit log, which might help you figure
out what is going wrong.  As you are unable to provide a testcase, I'm going to
close this bug as invalid, ie. assume that you are actually generating code
with overlapping addresses for overlays or something like that.

commit ae6c7e33e1510665e8e043eb11a71e59414efbf3
Author: Alan Modra <amodra@gmail.com>
Date:   Fri Sep 12 09:35:42 2014 +0930

    Test for overflow in eh_frame_hdr entries and for overlapping FDEs

    With larger binaries on 64-bit systems, or indeed just binaries that
    have a large gap between text and data, it is possible for the
    .eh_frame_hdr lookup table entry values to overflow a signed 32-bit
    relative offset.  It is also a requirement for the glibc FDE lookup
    code that only one FDE claim to cover any given address.

            * elf-bfd.h (struct eh_frame_array_ent): Add "range".
            * elf-eh-frame.c (_bfd_elf_write_section_eh_frame): Stash address
            range of FDEs to hdr_info->array.
            (_bfd_elf_write_section_eh_frame_hdr): Report overflow in
            .eh_frame_hdr entries, and overlapping FDEs.

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