1 /* Check for GLOB_TIDLE heap allocation issues (bugs 22320, 22325, 22332).
2 Copyright (C) 2017-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #include <glob.h>
20 #include <mcheck.h>
21 #include <nss.h>
22 #include <pwd.h>
23 #include <stdlib.h>
24 #include <string.h>
25 #include <support/check.h>
26 #include <support/support.h>
27
28 /* Flag which indicates whether to pass the GLOB_ONLYDIR flag. */
29 static int do_onlydir;
30
31 /* Flag which indicates whether to pass the GLOB_NOCHECK flag. */
32 static int do_nocheck;
33
34 /* Flag which indicates whether to pass the GLOB_MARK flag. */
35 static int do_mark;
36
37 /* Flag which indicates whether to pass the GLOB_NOESCAPE flag. */
38 static int do_noescape;
39
40 static void
41 one_test (const char *prefix, const char *middle, const char *suffix)
42 {
43 char *pattern = xasprintf ("%s%s%s", prefix, middle, suffix);
44 int flags = GLOB_TILDE;
45 if (do_onlydir)
46 flags |= GLOB_ONLYDIR;
47 if (do_nocheck)
48 flags |= GLOB_NOCHECK;
49 if (do_mark)
50 flags |= GLOB_MARK;
51 if (do_noescape)
52 flags |= GLOB_NOESCAPE;
53 glob_t gl;
54 /* This glob call might result in crashes or memory leaks. */
55 if (glob (pattern, flags, NULL, &gl) == 0)
56 globfree (&gl);
57 free (pattern);
58 }
59
60 enum
61 {
62 /* The largest base being tested. */
63 largest_base_size = 500000,
64
65 /* The actual size is the base size plus a variable whose absolute
66 value is not greater than this. This helps malloc to trigger
67 overflows. */
68 max_size_skew = 16,
69
70 /* The maximum string length supported by repeating_string
71 below. */
72 repeat_size = largest_base_size + max_size_skew,
73 };
74
75 /* Used to construct strings which repeat a single character 'x'. */
76 static char *repeat;
77
78 /* Return a string of SIZE characters. */
79 const char *
80 repeating_string (int size)
81 {
82 TEST_VERIFY (size >= 0);
83 TEST_VERIFY (size <= repeat_size);
84 const char *repeated_shifted = repeat + repeat_size - size;
85 TEST_VERIFY (strlen (repeated_shifted) == size);
86 return repeated_shifted;
87 }
88
89 static int
90 do_test (void)
91 {
92 /* Avoid network-based NSS modules and initialize nss_files with a
93 dummy lookup. This has to come before mtrace because NSS does
94 not free all memory. */
95 __nss_configure_lookup ("passwd", "files");
96 (void) getpwnam ("root");
97
98 mtrace ();
99
100 repeat = xmalloc (repeat_size + 1);
101 memset (repeat, 'x', repeat_size);
102 repeat[repeat_size] = '\0';
103
104 /* These numbers control the size of the user name. The values
105 cover the minimum (0), a typical size (8), a large
106 stack-allocated size (100000), and a somewhat large
107 heap-allocated size (largest_base_size). */
108 static const int base_sizes[] = { 0, 8, 100, 100000, largest_base_size, -1 };
109
110 for (do_onlydir = 0; do_onlydir < 2; ++do_onlydir)
111 for (do_nocheck = 0; do_nocheck < 2; ++do_nocheck)
112 for (do_mark = 0; do_mark < 2; ++do_mark)
113 for (do_noescape = 0; do_noescape < 2; ++do_noescape)
114 for (int base_idx = 0; base_sizes[base_idx] >= 0; ++base_idx)
115 {
116 for (int size_skew = -max_size_skew; size_skew <= max_size_skew;
117 ++size_skew)
118 {
119 int size = base_sizes[base_idx] + size_skew;
120 if (size < 0)
121 continue;
122
123 const char *user_name = repeating_string (size);
124 one_test ("~", user_name, "/a/b");
125 one_test ("~", user_name, "x\\x\\x////x\\a");
126 }
127
128 const char *user_name = repeating_string (base_sizes[base_idx]);
129 one_test ("~", user_name, "");
130 one_test ("~", user_name, "/");
131 one_test ("~", user_name, "/a");
132 one_test ("~", user_name, "/*/*");
133 one_test ("~", user_name, "\\/");
134 one_test ("/~", user_name, "");
135 one_test ("*/~", user_name, "/a/b");
136 }
137
138 free (repeat);
139
140 return 0;
141 }
142
143 #define TIMEOUT 200
144 #include <support/test-driver.c>