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sunrpc: Test case for clnt_create "unix" buffer overflow (bug 22542)

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Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
This commit is contained in:
Martin Sebor 2022-01-17 10:21:34 +01:00 committed by Florian Weimer
parent 226b46770c
commit ef972a4c50
2 changed files with 48 additions and 1 deletions
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5
sunrpc/Makefile
View File

@ -65,7 +65,8 @@ shared-only-routines = $(routines)
endif
tests = tst-xdrmem tst-xdrmem2 test-rpcent tst-udp-error tst-udp-timeout \
tst-udp-nonblocking
tst-udp-nonblocking tst-bug22542
xtests := tst-getmyaddr
ifeq ($(have-thread-library),yes)
@ -110,6 +111,8 @@ $(objpfx)tst-udp-nonblocking: $(common-objpfx)linkobj/libc.so
$(objpfx)tst-udp-garbage: \
$(common-objpfx)linkobj/libc.so $(shared-thread-library)
$(objpfx)tst-bug22542: $(common-objpfx)linkobj/libc.so
else # !have-GLIBC_2.31
routines = $(routines-for-nss)

44
sunrpc/tst-bug22542.c Normal file
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@ -0,0 +1,44 @@
/* Test to verify that overlong hostname is rejected by clnt_create
and doesn't cause a buffer overflow (bug 22542).
Copyright (C) 2022 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/>. */
#include <errno.h>
#include <rpc/clnt.h>
#include <string.h>
#include <support/check.h>
#include <sys/socket.h>
#include <sys/un.h>
static int
do_test (void)
{
/* Create an arbitrary hostname that's longer than fits in sun_path. */
char name [sizeof ((struct sockaddr_un*)0)->sun_path * 2];
memset (name, 'x', sizeof name - 1);
name [sizeof name - 1] = '\0';
errno = 0;
CLIENT *clnt = clnt_create (name, 0, 0, "unix");
TEST_VERIFY (clnt == NULL);
TEST_COMPARE (errno, EINVAL);
return 0;
}
#include <support/test-driver.c>