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79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
/* Test for vfprintf nargs allocation overflow (BZ #13656).
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Copyright (C) 2012-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Kees Cook <keescook@chromium.org>, 2012.
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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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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <inttypes.h>
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#include <string.h>
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#include <signal.h>
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static int
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format_failed (const char *fmt, const char *expected)
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{
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char output[80];
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printf ("%s : ", fmt);
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memset (output, 0, sizeof output);
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/* Having sprintf itself detect a failure is good. */
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if (sprintf (output, fmt, 1, 2, 3, "test") > 0
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&& strcmp (output, expected) != 0)
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{
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printf ("FAIL (output '%s' != expected '%s')\n", output, expected);
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return 1;
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}
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puts ("ok");
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return 0;
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}
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static int
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do_test (void)
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{
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int rc = 0;
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char buf[64];
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/* Regular positionals work. */
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if (format_failed ("%1$d", "1") != 0)
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rc = 1;
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/* Regular width positionals work. */
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if (format_failed ("%1$*2$d", " 1") != 0)
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rc = 1;
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/* Positional arguments are constructed via read_int, so nargs can only
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overflow on 32-bit systems. On 64-bit systems, it will attempt to
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allocate a giant amount of memory and possibly crash, which is the
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expected situation. Since the 64-bit behavior is arch-specific, only
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test this on 32-bit systems. */
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if (sizeof (long int) == 4)
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{
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sprintf (buf, "%%1$d %%%" PRIdPTR "$d",
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(intptr_t) (UINT32_MAX / sizeof (int)));
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if (format_failed (buf, "1 %$d") != 0)
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rc = 1;
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}
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return rc;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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