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


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

--- Comment #23 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
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The branch, hjl/pr17711/2.21 has been created
        at  26b173a5ba1dcb217d2a2f29f8e7c0c4efe4e1b4 (commit)

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=26b173a5ba1dcb217d2a2f29f8e7c0c4efe4e1b4

commit 26b173a5ba1dcb217d2a2f29f8e7c0c4efe4e1b4
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Thu Mar 5 11:36:35 2015 -0800

    Add a testcase for copy reloc against protected data

    Linkers in some versions of binutils 2.25 and 2.26 don't support protected
    data symbol with error messsage like:

    /usr/bin/ld: copy reloc against protected `bar' is invalid
    /usr/bin/ld: failed to set dynamic section sizes: Bad value

    We check if linker supports copy reloc against protected data symbol to
    avoid running the test if linker is broken.

        [BZ #17711]
        * config.make.in (have-protected-data): New.
        * configure.ac: Check linker support for protected data symbol.
        * configure: Regenerated.
        * elf/Makefile (modules-names): Add tst-protected1moda and
        tst-protected1modb if $(have-protected-data) is yes.
        (tests): Add tst-protected1a and tst-protected1b if
        $(have-protected-data) is yes.
        ($(objpfx)tst-protected1a): New.
        ($(objpfx)tst-protected1b): Likewise.
        (tst-protected1modb.so-no-z-defs): Likewise.
        * elf/tst-protected1a.c: New file.
        * elf/tst-protected1b.c: Likewise.
        * elf/tst-protected1mod.h: Likewise.
        * elf/tst-protected1moda.c: Likewise.
        * elf/tst-protected1modb.c: Likewise.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9024cd9cf032a49c6e08ec54737430f913409abb

commit 9024cd9cf032a49c6e08ec54737430f913409abb
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.

    Cherry-pick from master: 62da1e3b00b51383ffa7efc89d8addda0502e107
        [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.

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