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/* Bug 22786: test for buffer overflow in realpath.
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 file must be run from within a directory called "stdlib". */
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <support/test-driver.h>
#include <libc-diag.h>
static int
do_test (void)
{
const char dir[] = "bz22786";
const char lnk[] = "bz22786/symlink";
rmdir (dir);
if (mkdir (dir, 0755) != 0 && errno != EEXIST)
{
printf ("mkdir %s: %m\n", dir);
return EXIT_FAILURE;
}
if (symlink (".", lnk) != 0 && errno != EEXIST)
{
printf ("symlink (%s, %s): %m\n", dir, lnk);
return EXIT_FAILURE;
}
const size_t path_len = (size_t) INT_MAX + 1;
DIAG_PUSH_NEEDS_COMMENT;
#if __GNUC_PREREQ (7, 0)
/* GCC 7 warns about too-large allocations; here we need such
allocation to succeed for the test to work. */
DIAG_IGNORE_NEEDS_COMMENT (7, "-Walloc-size-larger-than=");
#endif
char *path = malloc (path_len);
DIAG_POP_NEEDS_COMMENT;
if (path == NULL)
{
printf ("malloc (%zu): %m\n", path_len);
return EXIT_UNSUPPORTED;
}
/* Construct very long path = "bz22786/symlink/aaaa....." */
char *p = mempcpy (path, lnk, sizeof (lnk) - 1);
*(p++) = '/';
memset (p, 'a', path_len - (path - p) - 2);
p[path_len - (path - p) - 1] = '\0';
/* This call crashes before the fix for bz22786 on 32-bit platforms. */
p = realpath (path, NULL);
if (p != NULL || errno != ENAMETOOLONG)
{
printf ("realpath: %s (%m)", p);
return EXIT_FAILURE;
}
/* Cleanup. */
unlink (lnk);
rmdir (dir);
return 0;
}
#define TEST_FUNCTION do_test
#include <support/test-driver.c>
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