[Bug libc/22766] all glibc internal dlopen should use RTLD_NOW for robust dlopen failures

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https://sourceware.org/bugzilla/show_bug.cgi?id=22766

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=81b49e969233ac5b9faf5c043bb0cc64bf9d6271

commit 81b49e969233ac5b9faf5c043bb0cc64bf9d6271
Author: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
Date:   Thu Apr 26 10:41:43 2018 -0300

    Increase robustness of internal dlopen() by using RTLD_NOW [BZ #22766]

    Prevent random runtime crashes due to missing symbols caused by mixed
    libnss_* versions.

        [BZ #22766]
        * include/dlfcn.h [__libc_dl_open]: Replace RTLD_LAZY with RTLD_NOW.
        * sysdeps/gnu/unwind-resume.c (__lib_gcc_s_init): Replace
        __libc_dlopen_mode() using RTLD_NOW with __libc_dlopen.
        * sysdeps/nptl/unwind-forcedunwind.c: Likewise.

    Signed-off-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
    Reviewed-by: Carlos O'Donell <carlos@redhat.com>

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

Summary of changes:
 ChangeLog                          |    8 ++++++++
 include/dlfcn.h                    |   23 ++++++++++++++++++++++-
 sysdeps/gnu/unwind-resume.c        |    7 ++-----
 sysdeps/nptl/unwind-forcedunwind.c |    3 ++-
 4 files changed, 34 insertions(+), 7 deletions(-)

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