inet/tst-if_index-long.c

   1 /* Check for descriptor leak in if_nametoindex with a long interface name.
   2    Copyright (C) 2018-2020 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 /* This test checks for a descriptor leak in case of a long interface
  20    name (CVE-2018-19591, bug 23927).  */
  21
  22 #include <errno.h>
  23 #include <net/if.h>
  24 #include <netdb.h>
  25 #include <string.h>
  26 #include <support/check.h>
  27 #include <support/descriptors.h>
  28 #include <support/support.h>
  29
  30 static int
  31 do_test (void)
  32 {
  33   struct support_descriptors *descrs = support_descriptors_list ();
  34
  35   /* Prepare a name which is just as long as required for trigging the
  36      bug.  */
  37   char name[IFNAMSIZ + 1];
  38   memset (name, 'A', IFNAMSIZ);
  39   name[IFNAMSIZ] = '\0';
  40   TEST_COMPARE (strlen (name), IFNAMSIZ);
  41   struct ifreq ifr;
  42   TEST_COMPARE (strlen (name), sizeof (ifr.ifr_name));
  43
  44   /* Test directly via if_nametoindex.  */
  45   TEST_COMPARE (if_nametoindex (name), 0);
  46   TEST_COMPARE (errno, ENODEV);
  47   support_descriptors_check (descrs);
  48
  49   /* Same test via getaddrinfo.  */
  50   char *host = xasprintf ("fea0::%%%s", name);
  51   struct addrinfo hints = { .ai_flags = AI_NUMERICHOST, };
  52   struct addrinfo *ai;
  53   TEST_COMPARE (getaddrinfo (host, NULL, &hints, &ai), EAI_NONAME);
  54   support_descriptors_check (descrs);
  55
  56   support_descriptors_free (descrs);
  57
  58   return 0;
  59 }
  60
  61 #include <support/test-driver.c>