[Bug libc/6610] New: NSS modules should be dlopen()ed with RTLD_DEEPBIND

["pasky at suse dot cz" <sourceware-bugzilla at sourceware dot org>]

nss/nsswitch.c should dlopen() the NSS modules with RTLD_DEEPBIND so that the
application symbols will not interfere with symbols the NSS module is using.

A practical example (pointed out by Michael Meeks) is nss_ldap + Thunderbird
failing, since both use incompatible LDAP libraries with some symbols clashing;
nss_ldap will use the Thunderbird LDAP library symbols in preference to these of
its own library, resulting in a crash. Deepbinding should solve this problem,
and I can think of no bad side-effects (in sane situations).

-- 
           Summary: NSS modules should be dlopen()ed with RTLD_DEEPBIND
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: pasky at suse dot cz
                CC: glibc-bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=6610

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