+/* Check for GLOB_TIDLE heap allocation issues (bug 22320, bug 22325).
+ Copyright (C) 2017 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/>. */
+
+#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;
+
+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;
+ 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 (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");
+ }
+
+ 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;
+}
+
+#include <support/test-driver.c>
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