1 /* Check for descriptor leak in if_nametoindex with a long interface name.
2 Copyright (C) 2018-2021 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
do_test(void)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>
62