[Bug libc/13271] New: getaddrinfo is not thread safe

["mol at astron dot nl" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=13271

             Bug #: 13271
           Summary: getaddrinfo is not thread safe
           Product: glibc
           Version: 2.14
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper.fsp@gmail.com
        ReportedBy: mol@astron.nl
    Classification: Unclassified


The getaddrinfo() can trigger the following sequence of function calls:

getaddrinfo()
gaih_inet()
__gethostbyname2_r()
_nss_dns_gethostbyname2_r()
_nss_dns_gethostbyname3_r()
__res_hostalias()
getenv("HOSTALIASES")

The getenv() function is not thread-safe however, so getaddrinfo() should not
call it. I suspect other getenv() functions can be reached as well, but I lack
enough glibc knowledge to provide a good list so I won't try.

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