[Bug libc/11099] New: INT_FIELD_MAYBE_NULL changed behaviour on x86_64

["pterjan at mandriva dot com" <sourceware-bugzilla at sourceware dot org>]

We had password aging bugs on Mandriva and I found that when a field of
/etc/shadow contains -1, it gets 32 bits value of -1 on x86_64 even if the field
is long in the struct.

According to the doc it should indeed be empty to disable instead of containing
-1, but well the field is signed and nothing prevents from having a negative value

It used to work and the behavior change broke tests like spw->sp_* != -1 in pam
modules

The change was introduced by
http://repo.or.cz/w/glibc.git/commitdiff/1e545d0185072ac0d4646223d509c3692cbe550a with
a commit message unrelated to this part of the commit

-- 
           Summary: INT_FIELD_MAYBE_NULL changed behaviour on x86_64
           Product: glibc
           Version: 2.11
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: pterjan at mandriva dot com
                CC: glibc-bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=11099

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