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/* Check for descriptor leak in if_nametoindex with a long interface name.
Copyright (C) 2018-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/* This test checks for a descriptor leak in case of a long interface
name (CVE-2018-19591, bug 23927). */
#include <errno.h>
#include <net/if.h>
#include <netdb.h>
#include <string.h>
#include <support/check.h>
#include <support/descriptors.h>
#include <support/support.h>
static int
do_test (void)
{
struct support_descriptors *descrs = support_descriptors_list ();
/* Prepare a name which is just as long as required for trigging the
bug. */
char name[IFNAMSIZ + 1];
memset (name, 'A', IFNAMSIZ);
name[IFNAMSIZ] = '\0';
TEST_COMPARE (strlen (name), IFNAMSIZ);
struct ifreq ifr;
TEST_COMPARE (strlen (name), sizeof (ifr.ifr_name));
/* Test directly via if_nametoindex. */
TEST_COMPARE (if_nametoindex (name), 0);
TEST_COMPARE (errno, ENODEV);
support_descriptors_check (descrs);
/* Same test via getaddrinfo. */
char *host = xasprintf ("fea0::%%%s", name);
struct addrinfo hints = { .ai_flags = AI_NUMERICHOST, };
struct addrinfo *ai;
TEST_COMPARE (getaddrinfo (host, NULL, &hints, &ai), EAI_NONAME);
support_descriptors_check (descrs);
support_descriptors_free (descrs);
return 0;
}
#include <support/test-driver.c>
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