[Bug dynamic-link/17711] copy relocations against protected symbols don't work

["cvs-commit at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17711

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=62da1e3b00b51383ffa7efc89d8addda0502e107

commit 62da1e3b00b51383ffa7efc89d8addda0502e107
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Tue Mar 31 05:15:43 2015 -0700

    Add ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA to x86

    With copy relocation, address of protected data defined in the shared
    library may be external.   When there is a relocation against the
    protected data symbol within the shared library, we need to check if we
    should skip the definition in the executable copied from the protected
    data.  This patch adds ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA and defines
    it for x86.  If ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA isn't 0, do_lookup_x
    will skip the data definition in the executable from copy reloc.

        [BZ #17711]
        * elf/dl-lookup.c (do_lookup_x): When UNDEF_MAP is NULL, which
        indicates it is called from do_lookup_x on relocation against
        protected data, skip the data definion in the executable from
        copy reloc.
        (_dl_lookup_symbol_x): Pass ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA,
        instead of ELF_RTYPE_CLASS_PLT, to do_lookup_x for
        EXTERN_PROTECTED_DATA relocation against STT_OBJECT symbol.
        * sysdeps/generic/ldsodefs.h * (ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA):
        New.  Defined to 4 if DL_EXTERN_PROTECTED_DATA is defined,
        otherwise to 0.
        * sysdeps/i386/dl-lookupcfg.h (DL_EXTERN_PROTECTED_DATA): New.
        * sysdeps/i386/dl-machine.h (elf_machine_type_class): Set class
        to ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA for R_386_GLOB_DAT.
        * sysdeps/x86_64/dl-lookupcfg.h (DL_EXTERN_PROTECTED_DATA): New.
        * sysdeps/x86_64/dl-machine.h (elf_machine_type_class): Set class
        to ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA for R_X86_64_GLOB_DAT.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                     |   20 +++++++++++++
 elf/dl-lookup.c               |   61 ++++++++++++++++++++++++++++++++++++++++-
 sysdeps/generic/ldsodefs.h    |   12 +++++++-
 sysdeps/i386/dl-lookupcfg.h   |    4 +++
 sysdeps/i386/dl-machine.h     |    8 ++++-
 sysdeps/x86_64/dl-lookupcfg.h |    4 +++
 sysdeps/x86_64/dl-machine.h   |    8 ++++-
 7 files changed, 111 insertions(+), 6 deletions(-)

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