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/* Test for vfprintf nargs allocation overflow (BZ #13656).
Copyright (C) 2012-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Kees Cook <keescook@chromium.org>, 2012.
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/>. */
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <inttypes.h>
#include <string.h>
#include <signal.h>
static int
format_failed (const char *fmt, const char *expected)
{
char output[80];
printf ("%s : ", fmt);
memset (output, 0, sizeof output);
/* Having sprintf itself detect a failure is good. */
if (sprintf (output, fmt, 1, 2, 3, "test") > 0
&& strcmp (output, expected) != 0)
{
printf ("FAIL (output '%s' != expected '%s')\n", output, expected);
return 1;
}
puts ("ok");
return 0;
}
static int
do_test (void)
{
int rc = 0;
char buf[64];
/* Regular positionals work. */
if (format_failed ("%1$d", "1") != 0)
rc = 1;
/* Regular width positionals work. */
if (format_failed ("%1$*2$d", " 1") != 0)
rc = 1;
/* Positional arguments are constructed via read_int, so nargs can only
overflow on 32-bit systems. On 64-bit systems, it will attempt to
allocate a giant amount of memory and possibly crash, which is the
expected situation. Since the 64-bit behavior is arch-specific, only
test this on 32-bit systems. */
if (sizeof (long int) == 4)
{
sprintf (buf, "%%1$d %%%" PRIdPTR "$d",
(intptr_t) (UINT32_MAX / sizeof (int)));
if (format_failed (buf, "1 %$d") != 0)
rc = 1;
}
return rc;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
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