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/* Check for GLOB_TIDLE heap allocation issues (bugs 22320, 22325, 22332).
Copyright (C) 2017-2020 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
<https://www.gnu.org/licenses/>. */
#include <glob.h>
#include <mcheck.h>
#include <nss.h>
#include <pwd.h>
#include <stdlib.h>
#include <string.h>
#include <support/check.h>
#include <support/support.h>
/* Flag which indicates whether to pass the GLOB_ONLYDIR flag. */
static int do_onlydir;
/* Flag which indicates whether to pass the GLOB_NOCHECK flag. */
static int do_nocheck;
/* Flag which indicates whether to pass the GLOB_MARK flag. */
static int do_mark;
/* Flag which indicates whether to pass the GLOB_NOESCAPE flag. */
static int do_noescape;
static void
one_test (const char *prefix, const char *middle, const char *suffix)
{
char *pattern = xasprintf ("%s%s%s", prefix, middle, suffix);
int flags = GLOB_TILDE;
if (do_onlydir)
flags |= GLOB_ONLYDIR;
if (do_nocheck)
flags |= GLOB_NOCHECK;
if (do_mark)
flags |= GLOB_MARK;
if (do_noescape)
flags |= GLOB_NOESCAPE;
glob_t gl;
/* This glob call might result in crashes or memory leaks. */
if (glob (pattern, flags, NULL, &gl) == 0)
globfree (&gl);
free (pattern);
}
enum
{
/* The largest base being tested. */
largest_base_size = 500000,
/* The actual size is the base size plus a variable whose absolute
value is not greater than this. This helps malloc to trigger
overflows. */
max_size_skew = 16,
/* The maximum string length supported by repeating_string
below. */
repeat_size = largest_base_size + max_size_skew,
};
/* Used to construct strings which repeat a single character 'x'. */
static char *repeat;
/* Return a string of SIZE characters. */
const char *
repeating_string (int size)
{
TEST_VERIFY (size >= 0);
TEST_VERIFY (size <= repeat_size);
const char *repeated_shifted = repeat + repeat_size - size;
TEST_VERIFY (strlen (repeated_shifted) == size);
return repeated_shifted;
}
static int
do_test (void)
{
/* Avoid network-based NSS modules and initialize nss_files with a
dummy lookup. This has to come before mtrace because NSS does
not free all memory. */
__nss_configure_lookup ("passwd", "files");
(void) getpwnam ("root");
mtrace ();
repeat = xmalloc (repeat_size + 1);
memset (repeat, 'x', repeat_size);
repeat[repeat_size] = '\0';
/* These numbers control the size of the user name. The values
cover the minimum (0), a typical size (8), a large
stack-allocated size (100000), and a somewhat large
heap-allocated size (largest_base_size). */
static const int base_sizes[] = { 0, 8, 100, 100000, largest_base_size, -1 };
for (do_onlydir = 0; do_onlydir < 2; ++do_onlydir)
for (do_nocheck = 0; do_nocheck < 2; ++do_nocheck)
for (do_mark = 0; do_mark < 2; ++do_mark)
for (do_noescape = 0; do_noescape < 2; ++do_noescape)
for (int base_idx = 0; base_sizes[base_idx] >= 0; ++base_idx)
{
for (int size_skew = -max_size_skew; size_skew <= max_size_skew;
++size_skew)
{
int size = base_sizes[base_idx] + size_skew;
if (size < 0)
continue;
const char *user_name = repeating_string (size);
one_test ("~", user_name, "/a/b");
one_test ("~", user_name, "x\\x\\x////x\\a");
}
const char *user_name = repeating_string (base_sizes[base_idx]);
one_test ("~", user_name, "");
one_test ("~", user_name, "/");
one_test ("~", user_name, "/a");
one_test ("~", user_name, "/*/*");
one_test ("~", user_name, "\\/");
one_test ("/~", user_name, "");
one_test ("*/~", user_name, "/a/b");
}
free (repeat);
return 0;
}
#define TIMEOUT 200
#include <support/test-driver.c>
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