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

["nszabolcs at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

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

            Bug ID: 22766
           Summary: all glibc internal dlopen should use RTLD_NOW for
                    robust dlopen failures
           Product: glibc
           Version: 2.27
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: nszabolcs at gmail dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

mixing libnss_* modules across glibc versions can fail because of
missing symbols (e.g. old libnss_nis.so.2 with new libnsl.so.1).

currently instead of a dlopen failure that allows graceful fallback
this is a runtime abort because of lazy binding.

in general RTLD_NOW is more robust and allows early failure instead of
random runtime crashes, so the __libc_dlopen definition should be fixed:

#define __libc_dlopen(name) \
  __libc_dlopen_mode (name, RTLD_LAZY | __RTLD_DLOPEN)

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