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62 lines
2.0 KiB
C
62 lines
2.0 KiB
C
/* Check for descriptor leak in if_nametoindex with a long interface name.
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Copyright (C) 2018-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* This test checks for a descriptor leak in case of a long interface
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name (CVE-2018-19591, bug 23927). */
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#include <errno.h>
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#include <net/if.h>
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#include <netdb.h>
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#include <string.h>
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#include <support/check.h>
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#include <support/descriptors.h>
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#include <support/support.h>
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static int
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do_test (void)
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{
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struct support_descriptors *descrs = support_descriptors_list ();
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/* Prepare a name which is just as long as required for trigging the
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bug. */
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char name[IFNAMSIZ + 1];
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memset (name, 'A', IFNAMSIZ);
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name[IFNAMSIZ] = '\0';
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TEST_COMPARE (strlen (name), IFNAMSIZ);
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struct ifreq ifr;
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TEST_COMPARE (strlen (name), sizeof (ifr.ifr_name));
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/* Test directly via if_nametoindex. */
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TEST_COMPARE (if_nametoindex (name), 0);
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TEST_COMPARE (errno, ENODEV);
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support_descriptors_check (descrs);
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/* Same test via getaddrinfo. */
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char *host = xasprintf ("fea0::%%%s", name);
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struct addrinfo hints = { .ai_flags = AI_NUMERICHOST, };
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struct addrinfo *ai;
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TEST_COMPARE (getaddrinfo (host, NULL, &hints, &ai), EAI_NONAME);
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support_descriptors_check (descrs);
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support_descriptors_free (descrs);
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return 0;
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}
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#include <support/test-driver.c>
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