Original patch from: gentoo/src/patchsets/glibc/2.9/0050_all_glibc-_nss_dns_gethostbyaddr2_r-check-and-adjust-the-buffer-alignment.patch

-= BEGIN original header =-

http://sourceware.org/ml/libc-alpha/2009-01/msg00000.html

From 8ad7030880eaa18dcabf8e284e79026301fd3fa4 Mon Sep 17 00:00:00 2001

From: Ulrich Drepper <drepper@redhat.com>

Date: Thu, 8 Jan 2009 00:02:38 +0000

Subject: [PATCH] (_nss_dns_gethostbyaddr2_r): Check and adjust the buffer alignment.

-= END original header =-

diff -durN glibc-2_9.orig/resolv/nss_dns/dns-host.c glibc-2_9/resolv/nss_dns/dns-host.c

--- glibc-2_9.orig/resolv/nss_dns/dns-host.c	2008-11-12 08:52:20.000000000 +0100

+++ glibc-2_9/resolv/nss_dns/dns-host.c	2009-02-02 22:00:36.000000000 +0100

@@ -364,6 +364,19 @@

   int n, status;

   int olderr = errno;

+ uintptr_t pad = -(uintptr_t) buffer % __alignof__ (struct host_data);

+ buffer += pad;

+ buflen = buflen > pad ? buflen - pad : 0;

+

+ if (__builtin_expect (buflen < sizeof (struct host_data), 0))

+   {

+     *errnop = ERANGE;

+     *h_errnop = NETDB_INTERNAL;

+     return NSS_STATUS_TRYAGAIN;

+   }

+

+ host_data = (struct host_data *) buffer;

+

   if (__res_maybe_init (&_res, 0) == -1)

     return NSS_STATUS_UNAVAIL;