145 lines
4.4 KiB
C
145 lines
4.4 KiB
C
/* Check for GLOB_TIDLE heap allocation issues (bugs 22320, 22325, 22332).
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Copyright (C) 2017-2019 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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<http://www.gnu.org/licenses/>. */
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#include <glob.h>
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#include <mcheck.h>
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#include <nss.h>
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#include <pwd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <support/check.h>
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#include <support/support.h>
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/* Flag which indicates whether to pass the GLOB_ONLYDIR flag. */
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static int do_onlydir;
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/* Flag which indicates whether to pass the GLOB_NOCHECK flag. */
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static int do_nocheck;
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/* Flag which indicates whether to pass the GLOB_MARK flag. */
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static int do_mark;
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/* Flag which indicates whether to pass the GLOB_NOESCAPE flag. */
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static int do_noescape;
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static void
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one_test (const char *prefix, const char *middle, const char *suffix)
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{
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char *pattern = xasprintf ("%s%s%s", prefix, middle, suffix);
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int flags = GLOB_TILDE;
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if (do_onlydir)
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flags |= GLOB_ONLYDIR;
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if (do_nocheck)
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flags |= GLOB_NOCHECK;
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if (do_mark)
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flags |= GLOB_MARK;
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if (do_noescape)
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flags |= GLOB_NOESCAPE;
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glob_t gl;
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/* This glob call might result in crashes or memory leaks. */
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if (glob (pattern, flags, NULL, &gl) == 0)
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globfree (&gl);
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free (pattern);
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}
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enum
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{
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/* The largest base being tested. */
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largest_base_size = 500000,
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/* The actual size is the base size plus a variable whose absolute
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value is not greater than this. This helps malloc to trigger
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overflows. */
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max_size_skew = 16,
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/* The maximum string length supported by repeating_string
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below. */
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repeat_size = largest_base_size + max_size_skew,
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};
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/* Used to construct strings which repeat a single character 'x'. */
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static char *repeat;
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/* Return a string of SIZE characters. */
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const char *
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repeating_string (int size)
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{
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TEST_VERIFY (size >= 0);
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TEST_VERIFY (size <= repeat_size);
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const char *repeated_shifted = repeat + repeat_size - size;
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TEST_VERIFY (strlen (repeated_shifted) == size);
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return repeated_shifted;
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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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/* Avoid network-based NSS modules and initialize nss_files with a
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dummy lookup. This has to come before mtrace because NSS does
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not free all memory. */
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__nss_configure_lookup ("passwd", "files");
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(void) getpwnam ("root");
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mtrace ();
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repeat = xmalloc (repeat_size + 1);
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memset (repeat, 'x', repeat_size);
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repeat[repeat_size] = '\0';
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/* These numbers control the size of the user name. The values
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cover the minimum (0), a typical size (8), a large
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stack-allocated size (100000), and a somewhat large
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heap-allocated size (largest_base_size). */
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static const int base_sizes[] = { 0, 8, 100, 100000, largest_base_size, -1 };
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for (do_onlydir = 0; do_onlydir < 2; ++do_onlydir)
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for (do_nocheck = 0; do_nocheck < 2; ++do_nocheck)
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for (do_mark = 0; do_mark < 2; ++do_mark)
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for (do_noescape = 0; do_noescape < 2; ++do_noescape)
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for (int base_idx = 0; base_sizes[base_idx] >= 0; ++base_idx)
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{
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for (int size_skew = -max_size_skew; size_skew <= max_size_skew;
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++size_skew)
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{
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int size = base_sizes[base_idx] + size_skew;
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if (size < 0)
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continue;
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const char *user_name = repeating_string (size);
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one_test ("~", user_name, "/a/b");
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one_test ("~", user_name, "x\\x\\x////x\\a");
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}
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const char *user_name = repeating_string (base_sizes[base_idx]);
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one_test ("~", user_name, "");
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one_test ("~", user_name, "/");
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one_test ("~", user_name, "/a");
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one_test ("~", user_name, "/*/*");
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one_test ("~", user_name, "\\/");
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one_test ("/~", user_name, "");
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one_test ("*/~", user_name, "/a/b");
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}
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free (repeat);
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return 0;
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}
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#define TIMEOUT 200
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#include <support/test-driver.c>
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