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inet/tst-if_index-long: New test case for CVE-2018-19591 [BZ #23927]

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Florian Weimer 2018-12-06 15:39:50 +01:00
parent f255336a93
commit 899478c2bf
3 changed files with 69 additions and 1 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2018-12-07 Florian Weimer <fweimer@redhat.com>
[BZ #23927]
CVE-2018-19591
* inet/tst-if_index-long.c: New file.
* inet/Makefile (tests): Add tst-if_index-long.
2018-12-07 Florian Weimer <fweimer@redhat.com>
* support/check.h (support_record_failure_is_failed): Declare.

2
inet/Makefile
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@ -52,7 +52,7 @@ aux := check_pf check_native ifreq
tests := htontest test_ifindex tst-ntoa tst-ether_aton tst-network \
tst-gethnm test-ifaddrs bug-if1 test-inet6_opt tst-ether_line \
tst-getni1 tst-getni2 tst-inet6_rth tst-checks tst-checks-posix \
tst-sockaddr test-hnto-types
tst-sockaddr test-hnto-types tst-if_index-long
# tst-deadline must be linked statically so that we can access
# internal functions.

61
inet/tst-if_index-long.c Normal file
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@ -0,0 +1,61 @@
/* Check for descriptor leak in if_nametoindex with a long interface name.
Copyright (C) 2018 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
<http://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>