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127 lines
4.0 KiB
C
127 lines
4.0 KiB
C
/* Tests for fortified sprintf with unknown buffer bounds (bug 30039).
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Copyright (C) 2023-2024 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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#include <printf.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#include <support/check.h>
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/* This test is not built with _FORTIFY_SOURCE. Instead it calls the
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appropriate implementation directly. The fortify mode is specified
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in this variable. */
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static int fortify_mode;
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/* This does not handle long-double redirects etc., but we test only
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format strings that stay within the confines of the base
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implementation. */
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int __vsprintf_chk (char *s, int flag, size_t slen, const char *format,
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va_list ap);
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/* Invoke vsprintf or __vsprintf_chk according to fortify_mode. */
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static int
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my_vsprintf (char *buf, const char *format, va_list ap)
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{
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int result;
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if (fortify_mode == 0)
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result = vsprintf (buf, format, ap);
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else
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/* Call the fortified version with an unspecified length. */
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result = __vsprintf_chk (buf, fortify_mode - 1, -1, format, ap);
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return result;
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}
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/* Run one test, with the specified expected output. */
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static void __attribute ((format (printf, 2, 3)))
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do_check (const char *expected, const char *format, ...)
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{
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va_list ap;
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va_start (ap, format);
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char buf_expected[24];
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memset (buf_expected, '@', sizeof (buf_expected));
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TEST_VERIFY (strlen (expected) < sizeof (buf_expected));
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strcpy (buf_expected, expected);
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char buf[sizeof (buf_expected)];
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memset (buf, '@', sizeof (buf));
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int ret = my_vsprintf (buf, format, ap);
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TEST_COMPARE_BLOB (buf_expected, sizeof (buf_expected), buf, sizeof (buf));
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TEST_COMPARE (ret, strlen (expected));
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va_end (ap);
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}
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/* Run the tests in all fortify modes. */
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static void
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do_tests (void)
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{
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for (fortify_mode = 0; fortify_mode <= 3; ++fortify_mode)
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{
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do_check ("0", "%d", 0);
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do_check ("-2147483648", "%d", -2147483647 - 1);
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do_check ("-9223372036854775808", "%lld", -9223372036854775807LL - 1);
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do_check ("", "%s", "");
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do_check (" ", "%22s", "");
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do_check ("XXXXXXXXXXXXXXXXXXXXXX", "%s", "XXXXXXXXXXXXXXXXXXXXXX");
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do_check ("1.125000", "%f", 1.125);
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do_check ("1.125", "%g", 1.125);
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do_check ("1.125", "%.8g", 1.125);
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}
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}
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/* printf callback that falls back to the glibc-supplied
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implementation. */
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static int
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dummy_printf_function (FILE *__stream,
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const struct printf_info *__info,
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const void *const *__args)
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{
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return -2; /* Request fallback. */
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}
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/* Likewise for the type information. */
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static int
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dummy_arginfo_function (const struct printf_info *info,
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size_t n, int *argtypes, int *size)
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{
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return -1; /* Request fallback. */
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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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do_tests ();
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/* Activate __printf_function_invoke mode. */
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register_printf_specifier ('d', dummy_printf_function,
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dummy_arginfo_function);
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register_printf_specifier ('g', dummy_printf_function,
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dummy_arginfo_function);
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register_printf_specifier ('s', dummy_printf_function,
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dummy_arginfo_function);
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/* Rerun the tests with callback functions. */
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do_tests ();
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return 0;
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}
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#include <support/test-driver.c>
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